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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_APT_NK_Andariel_Lilithrat_Variant

Detects a variant of the Lilith RAT malware family

MalwareLilithratSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
CISA.gov (modified by Florian Roth, Nextron Systems)
Date
2024-07-25
Modified
2024-07-26
Score / Quality
80 / 85

What this rule detects

Detects a variant of the Lilith RAT malware family

Associated malware family: Lilithrat.

Targets: Windows PE.

It defines 10 patterns (10 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-apt-nk-andariel-lilithrat-variant.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_APT_NK_Andariel_Lilithrat_Variant : FILE
{
	meta:
		description = "Detects a variant of the Lilith RAT malware family"
		author = "CISA.gov (modified by Florian Roth, Nextron Systems)"
		id = "916a289b-db7b-5f09-9d3e-589c3f09101d"
		date = "2024-07-25"
		modified = "2024-07-26"
		reference = "https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-207a"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_nk_andariel_jul24.yar#L143-L178"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "3ce68908468ff85683b081842fa4faa579fbf6f7dc1a7fab5dcf7eac63d90aea"
		score = 80
		quality = 85
		tags = "FILE"

	strings:
		$lilith_1 = "Initiate a CMD session first." ascii
		$lilith_2 = "CMD is not open" ascii
		$lilith_3 = "Couldn't write command" ascii
		$lilith_4 = "Couldn't write to CMD: CMD not open" ascii
		$unique_1 = "Upload Error!" ascii
		$unique_2 = "ERROR: Downloading is already running!" ascii
		$unique_3 = "ERROR: Unable to open file:" ascii
		$unique_4 = "General error" ascii
		$unique_5 = "CMD error" ascii
		$unique_6 = "killing self" ascii

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 150KB and ( all of ( $lilith_* ) or 4 of ( $unique_* ) or 1 of ( $lilith_4 , $unique_2 ) )
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$lilith_1text"Initiate a CMD session first."ascii
$lilith_2text"CMD is not open"ascii
$lilith_3text"Couldn't write command"ascii
$lilith_4text"Couldn't write to CMD: CMD not open"ascii
$unique_1text"Upload Error!"ascii
$unique_2text"ERROR: Downloading is already running!"ascii
$unique_3text"ERROR: Unable to open file:"ascii
$unique_4text"General error"ascii
$unique_5text"CMD error"ascii
$unique_6text"killing self"ascii

Condition

uint16( 0 ) == 0x5a4d and filesize < 150KB and ( all of ( $lilith_* ) or 4 of ( $unique_* ) or 1 of ( $lilith_4 , $unique_2 ) )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 150KB (a cheap guard that skips large files).
  • All patterns in ( $lilith_* ) must match.
  • At least 4 patterns in ( $unique_* ) must match.
  • At least 1 patterns in ( $lilith_4 , $unique_2 ) must match.

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References

Licence & attribution

Author: CISA.gov (modified by Florian Roth, Nextron Systems)

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

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

Rule id: 916a289b-db7b-5f09-9d3e-589c3f09101d

Tags:FILE

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