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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_EXT_NK_GOLDBACKDOOR_Generic_Shellcode

Generic detection for shellcode used to drop GOLDBACKDOOR

GenericSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Silas Cutler (silas@Stairwell.com)
Date
2022-04-21
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Generic detection for shellcode used to drop GOLDBACKDOOR

It defines 2 patterns (0 text, 2 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
ext-nk-goldbackdoor-generic-shellcode.yarDetection Rule License 1.1
rule SIGNATURE_BASE_EXT_NK_GOLDBACKDOOR_Generic_Shellcode
{
	meta:
		description = "Generic detection for shellcode used to drop GOLDBACKDOOR"
		author = "Silas Cutler (silas@Stairwell.com)"
		id = "70081d63-0b26-5358-8444-5adc3a44aaa0"
		date = "2022-04-21"
		modified = "2023-12-05"
		reference = "https://stairwell.com/wp-content/uploads/2022/04/Stairwell-threat-report-The-ink-stained-trail-of-GOLDBACKDOOR.pdf"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_nk_goldbackdoor.yar#L44-L58"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "e046a70b1dee020ba73d960a9d91daaccd0b5c262965c8647f608c5c83a28257"
		score = 75
		quality = 85
		tags = ""
		version = "0.1"

	strings:
		$ = { B9 8E 8A DD 8D 8B F0 E8 ?? ?? ?? ?? FF D0 }
		$ = { B9 8E AB 6F 40 [1-10] 50 [1-10] E8 ?? ?? ?? ?? FF D0 }

	condition:
		all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$hex{ B9 8E 8A DD 8D 8B F0 E8 ?? ?? ?? ?? FF D0 }
$hex{ B9 8E AB 6F 40 [1-10] 50 [1-10] E8 ?? ?? ?? ?? FF D0 }

Condition

all of them

In plain words (Heuristic)

  • All patterns in the rule must match.

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References

Licence & attribution

Author: Silas Cutler (silas@Stairwell.com)

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: 70081d63-0b26-5358-8444-5adc3a44aaa0

Metadata

version0.1

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