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YARA · Volexity threat-intel

VOLEXITY_Malware_Golang_Discordc2_Bmdyy_1

Detects a opensource malware available on github using strings in the binary. The DISGOMOJI malware family used by TransparentJasmine is based on this malware.

MalwareVolexity threat-intelBSD 2-Clause LicenseCompiles with YARA-X
Author
threatintel@volexity.com
Date
2024-03-28
Modified
2024-07-05
Score / Quality
75 / 80

What this rule detects

Detects a opensource malware available on github using strings in the binary. The DISGOMOJI malware family used by TransparentJasmine is based on this malware.

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

Summary generated from the rule's metadata and condition.

Rule source

malware-golang-discordc2-bmdyy-1.yarBSD 2-Clause License
rule VOLEXITY_Malware_Golang_Discordc2_Bmdyy_1 : FILE MEMORY
{
	meta:
		description = "Detects a opensource malware available on github using strings in the binary. The DISGOMOJI malware family used by TransparentJasmine is based on this malware."
		author = "threatintel@volexity.com"
		id = "6816d264-4311-5e90-948b-2e27cdf0b720"
		date = "2024-03-28"
		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#L216-L243"
		license_url = "https://github.com/volexity/threat-intel/blob/3a9d0b52459877ee866a9a0ba06e60059b778c77/LICENSE.txt"
		hash = "de32e96d1f151cc787841c12fad88d0a2276a93d202fc19f93631462512fffaf"
		logic_hash = "22b3e5109d0738552fbc310344b2651ab3297e324bc883d5332c1e8a7a1df29b"
		score = 75
		quality = 80
		tags = "FILE, MEMORY"
		os = "all"
		os_arch = "all"
		scan_context = "file,memory"
		severity = "high"
		license = "See license at https://github.com/volexity/threat-intel/blob/main/LICENSE.txt"
		rule_id = 10390
		version = 3

	strings:
		$s1 = "File is bigger than 8MB" wide ascii
		$s2 = "Uploaded file to" wide ascii
		$s3 = "sess-%d" wide ascii
		$s4 = "Session *%s* opened" wide ascii
		$s5 = "%s%d_%dx%d.png" wide ascii

	condition:
		4 of them
}

Strings (5 patterns)

IdentifierTypeValueModifiers
$s1text"File is bigger than 8MB"wide ascii
$s2text"Uploaded file to"wide ascii
$s3text"sess-%d"wide ascii
$s4text"Session *%s* opened"wide ascii
$s5text"%s%d_%dx%d.png"wide ascii

Condition

4 of them

In plain words (Heuristic)

  • At least 4 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).

  • de32e96d1f151cc787841c12fad88d0a2276a93d202fc19f93631462512fffaf

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: 6816d264-4311-5e90-948b-2e27cdf0b720

Metadata

osall
os_archall
scan_contextfile,memory
severityhigh
rule_id10390
version3

Tags:FILEMEMORY