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ESET_Kobalos

Kobalos malware

MalwareESET malware-iocBSD 2-Clause LicenseCompiles with YARA-X
Author
Marc-Etienne M.Léveillé
Date
2020-11-02
Modified
2021-02-01
Score / Quality
75 / 80

What this rule detects

Kobalos malware

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
kobalos.yarBSD 2-Clause License
rule ESET_Kobalos
{
	meta:
		description = "Kobalos malware"
		author = "Marc-Etienne M.Léveillé"
		id = "cdffbe3d-c19d-53a8-9051-48affae00c8a"
		date = "2020-11-02"
		modified = "2021-02-01"
		reference = "https://github.com/eset/malware-ioc/"
		source_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/kobalos/kobalos.yar#L32-L56"
		license_url = "https://github.com/eset/malware-ioc/blob/17baf44964a77368e9149f4f593eb098beddf1c5/LICENSE"
		logic_hash = "9161d22f9fbb1700dc3121e32104240e34512cb280aaf950aec61513f89061ef"
		score = 75
		quality = 80
		tags = ""
		license = "BSD 2-Clause"
		version = "1"

	strings:
		$encrypted_strings_sizes = {
            05 00 00 00 09 00 00 00  04 00 00 00 06 00 00 00
            08 00 00 00 08 00 00 00  02 00 00 00 02 00 00 00
            01 00 00 00 01 00 00 00  05 00 00 00 07 00 00 00
            05 00 00 00 05 00 00 00  05 00 00 00 0A 00 00 00
        }
		$password_md5_digest = { 3ADD48192654BD558A4A4CED9C255C4C }
		$rsa_512_mod_header = { 10 11 02 00 09 02 00 }
		$strings_rc4_key = { AE0E05090F3AC2B50B1BC6E91D2FE3CE }

	condition:
		any of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$encrypted_strings_sizeshex{ 05 00 00 00 09 00 00 00 04 00 00 00 06 00 00 00 08 00 00 00 08 00 00 00 02 00 00 00 02 00 00 00 01 00 00 00 01 00 00 00 …
$password_md5_digesthex{ 3ADD48192654BD558A4A4CED9C255C4C }
$rsa_512_mod_headerhex{ 10 11 02 00 09 02 00 }
$strings_rc4_keyhex{ AE0E05090F3AC2B50B1BC6E91D2FE3CE }

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: Marc-Etienne M.Léveillé

Source repository: ESET malware-ioc @ 17baf44964

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

“BSD 2-Clause”

Copyright notice: Copyright (c) 2014-2018 ESET spol. s r.o.

Original rule

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

Rule id: cdffbe3d-c19d-53a8-9051-48affae00c8a

Metadata

version1

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