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DITEKSHEN_MALWARE_Win_Twarbot

Detect TWarBot IRC Bot

MalwareTwarbotditekSHen detectionBSD 2-Clause LicenseCompiles with YARA-X
Author
ditekSHen
Date
2020-11-06
Modified
2024-11-01
Score / Quality
75 / 75

What this rule detects

Detect TWarBot IRC Bot

Associated malware family: Twarbot.

Targets: Windows PE.

It defines 8 patterns (8 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-twarbot.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Twarbot : FILE
{
	meta:
		description = "Detect TWarBot IRC Bot"
		author = "ditekSHen"
		id = "3acae103-c8d8-5959-83fd-f47d33da350b"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L10106-L10121"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "6b1b0b92d2ea7adec58a4b0ac712384542d96dc8707b6f1f13df2d8150a03a7a"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$x1 = "TWarBot" fullword ascii
		$s1 = "PRIVMSG #" ascii
		$s2 = "C:\\marijuana.txt" fullword ascii
		$s3 = "C:\\rar.bat" fullword ascii
		$s4 = "C:\\zip.bat" fullword ascii
		$s5 = "software\\microsoft\\windows\\currentversion\\app paths\\winzip32.exe" ascii
		$s6 = "software\\microsoft\\windows\\currentversion\\app paths\\WinRAR.exe" ascii
		$s7 = "a -idp -inul -c- -m5" ascii

	condition:
		uint16( 0 ) == 0x5a4d and ( ( 1 of ( $x* ) and 3 of ( $s* ) ) or 5 of ( $s* ) )
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$x1text"TWarBot"fullword ascii
$s1text"PRIVMSG #"ascii
$s2text"C:\\marijuana.txt"fullword ascii
$s3text"C:\\rar.bat"fullword ascii
$s4text"C:\\zip.bat"fullword ascii
$s5text"software\\microsoft\\windows\\currentversion\\app paths\\winzip32.exe"ascii
$s6text"software\\microsoft\\windows\\currentversion\\app paths\\WinRAR.exe"ascii
$s7text"a -idp -inul -c- -m5"ascii

Condition

uint16( 0 ) == 0x5a4d and ( ( 1 of ( $x* ) and 3 of ( $s* ) ) or 5 of ( $s* ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 1 patterns in ( $x* ) must match.
  • At least 3 patterns in ( $s* ) must match.
  • At least 5 patterns in ( $s* ) must match.

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References

Licence & attribution

Author: ditekSHen

Source repository: ditekSHen detection @ e76c93dcde

Licence: BSD 2-Clause License (repository licence)

Copyright notice: Copyright 2021 by ditekSHen (https://github.com/ditekshen/detection).

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 3acae103-c8d8-5959-83fd-f47d33da350b

Tags:FILE

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