Skip to content

YARA · Volexity threat-intel

VOLEXITY_Apt_Malware_Linux_Disgomoji_1

Detects GOMOJI 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 GOMOJI malware using strings in the ELF.

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

Summary generated from the rule's metadata and condition.

Rule source

apt-malware-linux-disgomoji-1.yarBSD 2-Clause License
rule VOLEXITY_Apt_Malware_Linux_Disgomoji_1 : TRANSPARENTJASMINE FILE MEMORY
{
	meta:
		description = "Detects GOMOJI malware using strings in the ELF."
		author = "threatintel@volexity.com"
		id = "f6643e9a-ca41-57e0-9fce-571d340f1cfe"
		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#L104-L131"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "d9f29a626857fa251393f056e454dfc02de53288ebe89a282bad38d03f614529"
		logic_hash = "dd3535079881ae9cfe25c129803668cb595be89b7f62eb82af19cc3839f92b6d"
		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 = 10265
		version = 7

	strings:
		$s1 = "Session *%s* opened!" wide ascii
		$s2 = "uevent_seqnum.sh" wide ascii
		$s3 = "Error downloading shell script: %v" wide ascii
		$s4 = "Error setting execute permissions: %v" wide ascii
		$s5 = "Error executing shell script: %v" wide ascii
		$s6 = "Error creating Discord session" wide ascii

	condition:
		4 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$s1text"Session *%s* opened!"wide ascii
$s2text"uevent_seqnum.sh"wide ascii
$s3text"Error downloading shell script: %v"wide ascii
$s4text"Error setting execute permissions: %v"wide ascii
$s5text"Error executing shell script: %v"wide ascii
$s6text"Error creating Discord session"wide ascii

Condition

4 of them

In plain words (Heuristic)

  • At least 4 patterns in the rule must match.

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

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: f6643e9a-ca41-57e0-9fce-571d340f1cfe

Metadata

oslinux
os_archall
scan_contextfile,memory
severitycritical
rule_id10265
version7

Tags:TRANSPARENTJASMINEFILEMEMORY