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DITEKSHEN_MALWARE_Win_Bagle

Detect Bagle / Beagle email worm

MalwareBagleditekSHen 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 Bagle / Beagle email worm

Associated malware family: Bagle.

Targets: Windows PE.

It defines 9 patterns (9 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
malware-win-bagle.yarBSD 2-Clause License
rule DITEKSHEN_MALWARE_Win_Bagle : FILE
{
	meta:
		description = "Detect Bagle / Beagle email worm"
		author = "ditekSHen"
		id = "32632bdf-6cf5-5542-8e1f-70686139a465"
		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#L10489-L10505"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "4c3a09f10c792de1ab25001da29ea2fee84c583d49d9a5225817644aabde2dea"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "SOFTWARE\\DateTime" fullword ascii
		$s2 = "%s?p=%lu" fullword ascii
		$s3 = "-upd" ascii
		$s4 = "[%RAND%]" fullword ascii
		$s5 = "MAIL FROM:<%s>" fullword ascii
		$s6 = "RCPT TO:<%s>" fullword ascii
		$s7 = "Message-ID: <%s%s>" fullword ascii
		$s8 = "Content-Disposition: attachment; filename=\"%s%s\"" fullword ascii
		$s9 = "http://www.%s" fullword ascii

	condition:
		uint16( 0 ) == 0x5a4d and 8 of them
}

Strings (9 patterns)

IdentifierTypeValueModifiers
$s1text"SOFTWARE\\DateTime"fullword ascii
$s2text"%s?p=%lu"fullword ascii
$s3text"-upd"ascii
$s4text"[%RAND%]"fullword ascii
$s5text"MAIL FROM:<%s>"fullword ascii
$s6text"RCPT TO:<%s>"fullword ascii
$s7text"Message-ID: <%s%s>"fullword ascii
$s8text"Content-Disposition: attachment; filename=\"%s%s\""fullword ascii
$s9text"http://www.%s"fullword ascii

Condition

uint16( 0 ) == 0x5a4d and 8 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 8 patterns in the rule 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: 32632bdf-6cf5-5542-8e1f-70686139a465

Tags:FILE

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