TrojanWin32Vawtrak_BackDoor

YARA-2025-1221 High general Active

No description available for this rule

TrojanWin32Vawtrak_BackDoor.yar Valid Syntax

rule TrojanWin32Vawtrak_BackDoor
{
	meta:
		Description  = "Backdoor.Win32.sm"
		ThreatLevel  = "5"

	strings:
		$ = "[VNC] New Client" ascii wide
		$ = "[VNC] Fail init BC" ascii wide
		$ = "[VNC] Fail addr proto BC" ascii wide
		$ = "[VNC] Fail connect BC" ascii wide
		$ = "[VNC] Fail init work:" ascii wide
		$ = "[VNC] Start Sever" ascii wide
		$ = "[VNC] Parse param error:" ascii wide
		$ = "[VNC] Fail create  process:" ascii wide
		$ = "[VNC] Fail inject to process:" ascii wide
		$ = "[Socks] New Client" ascii wide
		$ = "[Socks] Failt Init BC" ascii wide
		$ = "[Socks] Fail add proto BC" ascii wide
		$ = "[Socks] Failt connect BC" ascii wide
		$ = "[Socks] Fail parse param:" ascii wide
		$ = "[Pony] Fail Get Pass" ascii wide
		$ = "DL_EXEC Status [Pipe]" ascii wide
		$ = "DL_EXEC Status[Local]" ascii wide
		$ = "Start Socks addr:" ascii wide
		$ = "Start Socks Status[Pipe]" ascii wide
		$ = "Start Socks Status[Local]" ascii wide
		$ = "Start VNC addr: %s" ascii wide
		$ = "Start VNC Status[Pipe]: %u-%u-%u" ascii wide
		$ = "Start VNC Status[Local]: %u" ascii wide
		$ = "PID: %u [%0.2u:%0.2u:%0.2u]" ascii wide
		$ = "[BC] Cmd Ver Error" ascii wide
		$ = "[BC] Wait Ping error %u[%u]" ascii wide
		$ = "[BC] Fail Connect" ascii wide
		$ = "[BC] Fail send auth" ascii wide
		$ = "[BC] Fail read cmd" ascii wide
		$ = "[BC] cmd error: %u" ascii wide
		$ = "[BC] Cmd need disconnect" ascii wide
		$ = "SELECT hostname, encryptedUsername, encryptedPassword FROM moz_logins" ascii wide
		
		$str_0 = "T:\\Develop\\EQ2\\bin\\tmp" ascii wide
		$str_1 = "T:\\Develop\\EQ2\\bin\\tmp\\client_32.pdb" ascii wide
		$str_2 = "T:\\Develop\\EQ2\\bin\\tmp\\client_64.pdb" ascii wide
		$str_3 = "client_64.dll" ascii wide   
		$str_4 = "client_32.dll" ascii wide

	condition:
		(5 of them) or (any of ($str_*))
}

Rule Metadata

Description

Backdoor.Win32.sm

ThreatLevel

String Definitions

{"name":"$str_0","value":"\"T:\\\\Develop\\\\EQ2\\\\bin\\\\tmp\" ascii wide"}

{"name":"$str_1","value":"\"T:\\\\Develop\\\\EQ2\\\\bin\\\\tmp\\\\client_32.pdb\" ascii wide"}

{"name":"$str_2","value":"\"T:\\\\Develop\\\\EQ2\\\\bin\\\\tmp\\\\client_64.pdb\" ascii wide"}

{"name":"$str_3","value":"\"client_64.dll\" ascii wide"}

{"name":"$str_4","value":"\"client_32.dll\" ascii wide"}

Threat Analysis

This YARA rule is designed to detect general threats.

Severity Level: High

The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.

Detection Capabilities

File-based detection for executables and documents
Memory scanning for running processes
Network traffic analysis support

Command Line Usage

# Scan a single file
yara TrojanWin32Vawtrak_BackDoor.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r TrojanWin32Vawtrak_BackDoor.yar /path/to/directory/

# Scan with metadata output
yara -m TrojanWin32Vawtrak_BackDoor.yar target_file

# Scan process memory (Linux)
yara TrojanWin32Vawtrak_BackDoor.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='TrojanWin32Vawtrak_BackDoor.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=TrojanWin32Vawtrak_BackDoor.yar /path/to/scan

Rule Information

YARA ID

YARA-2025-1221

Author

Unknown

Repository

mikesxrs_Open-Source-YARA-rules

Created

August 19, 2025

Last Updated

August 19, 2025

Last Imported

Never

Threat Intelligence

Risk Level High

Category general

Detection Confidence Analysis Pending

False Positive Rate Not Available

Last Seen in Wild No Data

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Export Options

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TrojanWin32Vawtrak_BackDoor

Rule Metadata

String Definitions

Threat Analysis

Detection Capabilities

Command Line Usage

Integration Examples

Python (yara-python)

ClamAV Integration

Rule Information

Threat Intelligence

Related Rules

Export Options

Similar Rules in general

Detect_Mimic_Ransomware

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