YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_Sandworm_Exaramel_Strings_Typo

Detects misc strings in Exaramel malware with typos

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 misc strings in Exaramel malware with typos

Associated malware family: Exaramel.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

apt-mal-sandworm-exaramel-strings-typo.yarDetection Rule License 1.1

rule SIGNATURE_BASE_APT_MAL_Sandworm_Exaramel_Strings_Typo
{
	meta:
		description = "Detects misc strings in Exaramel malware with typos"
		author = "FR/ANSSI/SDO"
		id = "fdc79b87-eb9e-5751-9474-ff653b073165"
		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#L187-L202"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "65e6de743eb9fc742674c7e54eef8a376963a6fd4380bacd03fe6f92d4235920"
		score = 80
		quality = 85
		tags = ""

	strings:
		$typo1 = "/sbin/init | awk "
		$typo2 = "Syslog service for monitoring \n"
		$typo3 = "Error.Can't update app! Not enough update archive."
		$typo4 = ":\"metod\""

	condition:
		3 of ( $typo* )
}

Strings (4 patterns)

Identifier	Type	Value
$typo1	text	"/sbin/init \| awk "
$typo2	text	"Syslog service for monitoring \n"
$typo3	text	"Error.Can't update app! Not enough update archive."
$typo4	text	":\"metod\""

Condition

3 of ( $typo* )

In plain words (Heuristic)

At least 3 patterns in ( $typo* ) must match.

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References

https://www.cert.ssi.gouv.fr/uploads/CERTFR-2021-CTI-005.pdf

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: fdc79b87-eb9e-5751-9474-ff653b073165

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