YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_FE_APT_Trojan_Linux32_LOCKPICK_1

Detects samples mentioned in PulseSecure report

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Mandiant
Date: 2021-04-16
Modified: 2023-12-05
Score / Quality: 75 / 85

What this rule detects

Detects samples mentioned in PulseSecure report

Targets: Linux ELF.

It defines 2 patterns (0 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

fe-apt-trojan-linux32-lockpick-1.yarDetection Rule License 1.1

rule SIGNATURE_BASE_FE_APT_Trojan_Linux32_LOCKPICK_1 : FILE
{
	meta:
		description = "Detects samples mentioned in PulseSecure report"
		author = "Mandiant"
		id = "00c09378-25a0-55f1-8d93-7b22d98bd8c2"
		date = "2021-04-16"
		modified = "2023-12-05"
		reference = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_pulsesecure.yar#L66-L80"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "e8bfd3f5a2806104316902bbe1195ee8"
		logic_hash = "1623c2dc63fe7d595069a024b715bbca267ec1c9400afcadc377ae58afb81a2a"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$sb1 = { 83 ?? 63 0F 84 [4] 8B 45 ?? 83 ?? 01 89 ?? 24 89 44 24 04 E8 [4] 85 C0 }
		$sb2 = { 83 [2] 63 74 ?? 89 ?? 24 04 89 ?? 24 E8 [4] 83 [2] 01 85 C0 0F [5] EB 00 8B ?? 04 83 F8 02 7? ?? 83 E8 01 C1 E0 02 83 C0 00 89 44 24 08 8D 83 [4] 89 44 24 04 8B ?? 89 04 24 E8 }

	condition:
		(( uint32( 0 ) == 0x464c457f ) and ( uint8( 4 ) == 1 ) ) and ( @sb1 [ 1 ] < @sb2 [ 1 ] )
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$sb1	hex	{ 83 ?? 63 0F 84 [4] 8B 45 ?? 83 ?? 01 89 ?? 24 89 44 24 04 E8 [4] 85 C0 }
$sb2	hex	{ 83 [2] 63 74 ?? 89 ?? 24 04 89 ?? 24 E8 [4] 83 [2] 01 85 C0 0F [5] EB 00 8B ?? 04 83 F8 02 7? ?? 83 E8 01 C1 E0 02 83 C0 00 89 44 24 08 8D 83 [4] 89 44 24 04 …

Condition

(( uint32( 0 ) == 0x464c457f ) and ( uint8( 4 ) == 1 ) ) and ( @sb1 [ 1 ] < @sb2 [ 1 ] )

In plain words (Heuristic)

The file must start with the ELF header — a Linux/Unix executable.

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

References

https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

e8bfd3f5a2806104316902bbe1195ee8

Licence & attribution

Author: Mandiant

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: 00c09378-25a0-55f1-8d93-7b22d98bd8c2

Tags:FILE

SIGNATURE_BASE_M_APT_Downloader_BEATDROP
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2022-04-28
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_1
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_2
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_3
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_4
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_5
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_NK_MAL_M_Hunting_VEILEDSIGNAL_6
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-04-20
SIGNATURE_BASE_APT_UNC4736_NK_MAL_TAXHAUL_3CX_Apr23_1
APT / threat actorSignature Base (Florian Roth / Nextron)· Mandiant· 2023-03-04