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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_APT_NK_Andariel_ELF_Backdoor_Fipps

Detects a Linux backdoor named Fipps used by Andariel

MalwareSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
CISA.gov
Date
2024-07-25
Modified
2026-01-29
Score / Quality
80 / 85

What this rule detects

Detects a Linux backdoor named Fipps used by Andariel

Targets: Linux ELF.

It defines 4 patterns (4 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-apt-nk-andariel-elf-backdoor-fipps.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_APT_NK_Andariel_ELF_Backdoor_Fipps : FILE
{
	meta:
		description = "Detects a Linux backdoor named Fipps used by Andariel"
		author = "CISA.gov"
		id = "040bca78-8b7e-5397-8a2b-1ddeed59eea3"
		date = "2024-07-25"
		modified = "2026-01-29"
		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#L291-L307"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "3b57eb6c6b89e93863b9600c4a1384f3e064f236e827ef9ffc37b1e5dcff7d24"
		score = 80
		quality = 85
		tags = "FILE"

	strings:
		$a = "found mac address"
		$b = "RecvThread"
		$c = "OpenSSL-1.0.0-fipps"
		$d = "Disconnected!"

	condition:
		uint32( 0 ) == 0x464c457f and all of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$atext"found mac address"
$btext"RecvThread"
$ctext"OpenSSL-1.0.0-fipps"
$dtext"Disconnected!"

Condition

uint32( 0 ) == 0x464c457f and all of them

In plain words (Heuristic)

  • The file must start with the ELF header — a Linux/Unix executable.
  • All patterns in the rule must match.

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References

Licence & attribution

Author: CISA.gov

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: 040bca78-8b7e-5397-8a2b-1ddeed59eea3

Tags:FILE

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