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SIGNATURE_BASE_APT_MAL_Sandworm_Exaramel_Struct

Detects the beginning of type _type struct for some of the most important structs in Exaramel malware

APT / threat actorExaramelSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
FR/ANSSI/SDO
Date
2021-02-15
Modified
2024-05-25
Score / Quality
80 / 85

What this rule detects

Detects the beginning of type _type struct for some of the most important structs in Exaramel malware

Associated malware family: Exaramel.

It defines 5 patterns (0 text, 5 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-mal-sandworm-exaramel-struct.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_MAL_Sandworm_Exaramel_Struct
{
	meta:
		description = "Detects the beginning of type _type struct for some of the most important structs in Exaramel malware"
		author = "FR/ANSSI/SDO"
		id = "8282e485-966c-554d-8e41-70dc1657f5ea"
		date = "2021-02-15"
		modified = "2024-05-25"
		reference = "https://www.cert.ssi.gouv.fr/uploads/CERTFR-2021-CTI-005.pdf"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_sandworm_centreon.yar#L169-L185"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "312d0598fa85837f94023036468fcae50e8b2de532430a944befa8090afe79f6"
		score = 80
		quality = 85
		tags = ""

	strings:
		$struct_le_config = {70 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 47 2d 28 42 0? [2] 19}
		$struct_le_worker = {30 00 00 00 00 00 00 00 30 00 00 00 00 00 00 00 46 6a 13 e2 0? [2] 19}
		$struct_le_client = {20 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 7b 6a 49 84 0? [2] 19}
		$struct_le_report = {30 00 00 00 00 00 00 00 28 00 00 00 00 00 00 00 bf 35 0d f9 0? [2] 19}
		$struct_le_task = {50 00 00 00 00 00 00 00 20 00 00 00 00 00 00 00 88 60 a1 c5 0? [2] 19}

	condition:
		any of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$struct_le_confighex{70 00 00 00 00 00 00 00 58 00 00 00 00 00 00 00 47 2d 28 42 0? [2] 19}
$struct_le_workerhex{30 00 00 00 00 00 00 00 30 00 00 00 00 00 00 00 46 6a 13 e2 0? [2] 19}
$struct_le_clienthex{20 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 7b 6a 49 84 0? [2] 19}
$struct_le_reporthex{30 00 00 00 00 00 00 00 28 00 00 00 00 00 00 00 bf 35 0d f9 0? [2] 19}
$struct_le_taskhex{50 00 00 00 00 00 00 00 20 00 00 00 00 00 00 00 88 60 a1 c5 0? [2] 19}

Condition

any of them

In plain words (Heuristic)

  • At least one pattern in the rule must match.

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References

Licence & attribution

Author: FR/ANSSI/SDO

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: 8282e485-966c-554d-8e41-70dc1657f5ea

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