YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_LNX_Turla_Apr20_1

Detects Turla Linux malware

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

Author: Florian Roth (Nextron Systems)
Date: 2020-04-05
Modified: 2023-12-05
Score / Quality: 75 / 85

What this rule detects

Detects Turla Linux malware

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-mal-lnx-turla-apr20-1.yarDetection Rule License 1.1

rule SIGNATURE_BASE_APT_MAL_LNX_Turla_Apr20_1 : FILE
{
	meta:
		description = "Detects Turla Linux malware"
		author = "Florian Roth (Nextron Systems)"
		id = "f21e7793-a7dd-5195-805d-963827b35808"
		date = "2020-04-05"
		modified = "2023-12-05"
		reference = "https://twitter.com/Int2e_/status/1246115636331319309"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_turla.yar#L252-L272"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "67d9556c695ef6c51abf6fbab17acb3466e3149cf4d20cb64d6d34dc969b6502"
		hash = "8ccc081d4940c5d8aa6b782c16ed82528c0885bbb08210a8d0a8c519c54215bc"
		logic_hash = "d463f5a151bb0c3440d719b4c7c0d1ca34de1e0bed7fb9167ecf396607abd3ff"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$s1 = "/root/.hsperfdata" ascii fullword
		$s2 = "Desc|     Filename     |  size  |state|" ascii fullword
		$s3 = "IPv6 address %s not supported" ascii fullword
		$s4 = "File already exist on remote filesystem !" ascii fullword
		$s5 = "/tmp/.sync.pid" ascii fullword
		$s6 = "'gateway' supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel" ascii fullword

	condition:
		uint16( 0 ) == 0x457f and filesize < 5000KB and 4 of them
}

Strings (6 patterns)

Identifier	Type	Value	Modifiers
$s1	text	"/root/.hsperfdata"	ascii fullword
$s2	text	"Desc\| Filename \| size \|state\|"	ascii fullword
$s3	text	"IPv6 address %s not supported"	ascii fullword
$s4	text	"File already exist on remote filesystem !"	ascii fullword
$s5	text	"/tmp/.sync.pid"	ascii fullword
$s6	text	"'gateway' supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel"	ascii fullword

Condition

uint16( 0 ) == 0x457f and filesize < 5000KB and 4 of them

In plain words (Heuristic)

The file must be smaller than 5000KB (a cheap guard that skips large files).
At least 4 patterns in the rule must match.

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References

https://twitter.com/Int2e_/status/1246115636331319309

Sample hashes

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

67d9556c695ef6c51abf6fbab17acb3466e3149cf4d20cb64d6d34dc969b6502
8ccc081d4940c5d8aa6b782c16ed82528c0885bbb08210a8d0a8c519c54215bc

Licence & attribution

Author: 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: f21e7793-a7dd-5195-805d-963827b35808

Tags:FILE

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