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VOLEXITY_Apt_Malware_Linux_Disgomoji_2

Detects DISGOMOJI malware using strings in the ELF.

APT / threat actorVolexity threat-intelBSD 2-Clause LicenseCompiles with YARA-X
Author
threatintel@volexity.com
Date
2024-02-22
Modified
2024-07-05
Score / Quality
75 / 80

What this rule detects

Detects DISGOMOJI malware using strings in the ELF.

It defines 10 patterns (10 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

apt-malware-linux-disgomoji-2.yarBSD 2-Clause License
rule VOLEXITY_Apt_Malware_Linux_Disgomoji_2 : TRANSPARENTJASMINE FILE MEMORY
{
	meta:
		description = "Detects DISGOMOJI malware using strings in the ELF."
		author = "threatintel@volexity.com"
		id = "609beb47-5e93-5f69-b89d-2cf62f20851a"
		date = "2024-02-22"
		modified = "2024-07-05"
		reference = "TIB-20240229"
		source_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/2024/2024-06-13 DISGOMOJI/indicators/rules.yar#L72-L103"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "d9f29a626857fa251393f056e454dfc02de53288ebe89a282bad38d03f614529"
		logic_hash = "e03a774cca2946c1becdbd775ef465033dae089d578ea18a4f43fd7bdae9168e"
		score = 75
		quality = 80
		tags = "TRANSPARENTJASMINE, FILE, MEMORY"
		os = "linux"
		os_arch = "all"
		scan_context = "file,memory"
		severity = "critical"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 10266
		version = 9

	strings:
		$s1 = "downloadFileFromURL" wide ascii
		$s2 = "createCronJob" wide ascii
		$s3 = "findAndSendFiles" wide ascii
		$s4 = "updateLogFile" wide ascii
		$s5 = "handleZipFile" wide ascii
		$s6 = "takeScreenshot" wide ascii
		$s7 = "zipFirefoxProfile" wide ascii
		$s8 = "zipDirectoryWithParts" wide ascii
		$s9 = "uploadAndSendToOshi" wide ascii
		$s10 = "uploadAndSendToLeft" wide ascii

	condition:
		7 of them
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$s1text"downloadFileFromURL"wide ascii
$s2text"createCronJob"wide ascii
$s3text"findAndSendFiles"wide ascii
$s4text"updateLogFile"wide ascii
$s5text"handleZipFile"wide ascii
$s6text"takeScreenshot"wide ascii
$s7text"zipFirefoxProfile"wide ascii
$s8text"zipDirectoryWithParts"wide ascii
$s9text"uploadAndSendToOshi"wide ascii
$s10text"uploadAndSendToLeft"wide ascii

Condition

7 of them

In plain words (Heuristic)

  • At least 7 patterns in the rule must match.

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Sample hashes

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

  • d9f29a626857fa251393f056e454dfc02de53288ebe89a282bad38d03f614529

Licence & attribution

Author: threatintel@volexity.com

Source repository: Volexity threat-intel @ 3a9d0b5245

Licence: BSD 2-Clause License (stated in the rule's own meta)

“See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt”

Copyright notice: Copyright 2022 by Volexity, Inc.

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 609beb47-5e93-5f69-b89d-2cf62f20851a

Metadata

oslinux
os_archall
scan_contextfile,memory
severitycritical
rule_id10266
version9

Tags:TRANSPARENTJASMINEFILEMEMORY