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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_MAL_APT_NK_WIN_Tiger_RAT_Auto

Detects the Tiger RAT variant used by Andariel

MalwareTiger RatSignature 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
75 / 85

What this rule detects

Detects the Tiger RAT variant used by Andariel

Associated malware family: Tiger Rat.

It defines 16 patterns (0 text, 16 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
mal-apt-nk-win-tiger-rat-auto.yarDetection Rule License 1.1
rule SIGNATURE_BASE_MAL_APT_NK_WIN_Tiger_RAT_Auto : FILE
{
	meta:
		description = "Detects the Tiger RAT variant used by Andariel"
		author = "CISA.gov"
		id = "4579af62-52be-5f5f-a577-16ec50297c05"
		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#L426-L565"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "1deef66efb44c0d17f33508a8b6f0d6253f0308f309e81657f78eb0f87121bf5"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$sequence_0 = { 33 c0 89 44 24 38 89 44 24 30 44 8b cf 45 33 c0 }
		$sequence_1 = { 41 b9 01 00 00 00 48 8b d6 48 8b cb e8 ?? ?? ?? ?? }
		$sequence_2 = { 48 81 ec 90 05 00 00 8b 01 89 85 c8 04 00 00 8b 41 04 }
		$sequence_3 = { 48 8b 01 ff 10 48 8b 4f 08 4c 8d 4c 24 30 }
		$sequence_4 = { 48 8b 01 ff 10 48 8b 4e 18 48 8b 01 }
		$sequence_5 = { 48 81 ec a0 00 00 00 33 c0 48 8b d9 48 8d 4c 24 32 }
		$sequence_6 = { 48 8b 01 eb 03 48 8b c1 0f b6 00 }
		$sequence_7 = { 48 8b 01 8b 10 89 51 24 44 8b 41 24 45 85 c0 }
		$sequence_8 = { 4c 8d 0d 31 eb 00 00 c1 e9 18 c1 e8 08 41 bf 00 00 00 80 }
		$sequence_9 = { 48 8b d8 48 85 c0 75 2d ff 15 ?? ?? ?? ?? 83 f8 57 0f 85 e0 01 00 00 48 8d 0d a0 bd 00 00 }
		$sequence_10 = { 75 d4 48 8d 1d 7f 6c 01 00 48 8b 4b f8 48 85 c9 74 0b }
		$sequence_11 = { 0f 85 d9 00 00 00 48 8d 15 d0 c9 00 00 41 b8 10 20 01 00 48 8b cd e8 ?? ?? ?? ?? eb 6b b9 f4 ff ff ff }
		$sequence_12 = { 48 89 0d ?? ?? ?? ?? 48 89 05 ?? ?? ?? ?? 48 8d 05 ae 61 00 00 48 89 05 ?? ?? ?? ?? 48 8d 05 a0 55 00 00 48 89 05 ?? ?? ?? ?? }
		$sequence_13 = { 8b cf e8 ?? ?? ?? ?? 48 8b 7c 24 48 85 c0 0f 84 40 03 00 00 48 8d 05 60 25 01 00 }
		$sequence_14 = { ff 15 ?? ?? ?? ?? 8b 05 ?? ?? ?? ?? 23 05 ?? ?? ?? ?? ba 02 00 00 00 33 c9 89 05 ?? ?? ?? ?? 8b 05 ?? ?? ?? ?? }
		$sequence_15 = { 48 83 ec 30 49 8b d8 e8 ?? ?? ?? ?? 48 8b c8 48 85 c0 }

	condition:
		filesize < 600KB and 7 of them
}

Strings (16 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ 33 c0 89 44 24 38 89 44 24 30 44 8b cf 45 33 c0 }
$sequence_1hex{ 41 b9 01 00 00 00 48 8b d6 48 8b cb e8 ?? ?? ?? ?? }
$sequence_2hex{ 48 81 ec 90 05 00 00 8b 01 89 85 c8 04 00 00 8b 41 04 }
$sequence_3hex{ 48 8b 01 ff 10 48 8b 4f 08 4c 8d 4c 24 30 }
$sequence_4hex{ 48 8b 01 ff 10 48 8b 4e 18 48 8b 01 }
$sequence_5hex{ 48 81 ec a0 00 00 00 33 c0 48 8b d9 48 8d 4c 24 32 }
$sequence_6hex{ 48 8b 01 eb 03 48 8b c1 0f b6 00 }
$sequence_7hex{ 48 8b 01 8b 10 89 51 24 44 8b 41 24 45 85 c0 }
$sequence_8hex{ 4c 8d 0d 31 eb 00 00 c1 e9 18 c1 e8 08 41 bf 00 00 00 80 }
$sequence_9hex{ 48 8b d8 48 85 c0 75 2d ff 15 ?? ?? ?? ?? 83 f8 57 0f 85 e0 01 00 00 48 8d 0d a0 bd 00 00 }
$sequence_10hex{ 75 d4 48 8d 1d 7f 6c 01 00 48 8b 4b f8 48 85 c9 74 0b }
$sequence_11hex{ 0f 85 d9 00 00 00 48 8d 15 d0 c9 00 00 41 b8 10 20 01 00 48 8b cd e8 ?? ?? ?? ?? eb 6b b9 f4 ff ff ff }
$sequence_12hex{ 48 89 0d ?? ?? ?? ?? 48 89 05 ?? ?? ?? ?? 48 8d 05 ae 61 00 00 48 89 05 ?? ?? ?? ?? 48 8d 05 a0 55 00 00 48 89 05 ?? ?? ?? ?? }
$sequence_13hex{ 8b cf e8 ?? ?? ?? ?? 48 8b 7c 24 48 85 c0 0f 84 40 03 00 00 48 8d 05 60 25 01 00 }
$sequence_14hex{ ff 15 ?? ?? ?? ?? 8b 05 ?? ?? ?? ?? 23 05 ?? ?? ?? ?? ba 02 00 00 00 33 c9 89 05 ?? ?? ?? ?? 8b 05 ?? ?? ?? ?? }
$sequence_15hex{ 48 83 ec 30 49 8b d8 e8 ?? ?? ?? ?? 48 8b c8 48 85 c0 }

Condition

filesize < 600KB and 7 of them

In plain words (Heuristic)

  • The file must be smaller than 600KB (a cheap guard that skips large files).
  • At least 7 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: 4579af62-52be-5f5f-a577-16ec50297c05

Tags:FILE

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