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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_EXT_NK_GOLDBACKDOOR_Inital_Shellcode

Detection for initial shellcode loader used to deploy GOLDBACDOOR

MalwareSignature 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
80 / 85

What this rule detects

Detection for initial shellcode loader used to deploy GOLDBACDOOR

It defines 3 patterns (0 text, 3 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
ext-nk-goldbackdoor-inital-shellcode.yarDetection Rule License 1.1
rule SIGNATURE_BASE_EXT_NK_GOLDBACKDOOR_Inital_Shellcode
{
	meta:
		description = "Detection for initial shellcode loader used to deploy GOLDBACDOOR"
		author = "Silas Cutler (silas@Stairwell.com)"
		id = "daab8e54-11b3-51cc-8bee-55b078f3e791"
		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#L2-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "4df97181037a580098dbe34d3b6ceab5c7b83932f1831c36ee99876a8f1524f9"
		score = 80
		quality = 85
		tags = ""
		version = "0.1"

	strings:
		$ = { C7 45 C4 25 6C 6F 63 50 8D 45 C4 C7 45 C8 61 6C 61 70 8B F9 C7 45
              CC 70 64 61 74 50 B9 BD 88 17 75 C7 45 D0 61 25 5C 6C 8B DA C7 45 D4 6F
              67 5F 67 C7 45 D8 6F 6C 64 2E C7 45 DC 74 78 74 00 }
		$ = { 51 50 57 56 B9 E6 8E 85 35 E8 ?? ?? ?? ?? FF D0 }
		$ = { 6A 40 68 00 10 00 00 52 6A 00 FF 75 E0 B9 E3 18 90 72 E8 ?? ?? ?? ?? FF D0}

	condition:
		all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$hex{ C7 45 C4 25 6C 6F 63 50 8D 45 C4 C7 45 C8 61 6C 61 70 8B F9 C7 45 CC 70 64 61 74 50 B9 BD 88 17 75 C7 45 D0 61 25 5C 6C 8B DA C7 45 D4 6F …
$hex{ 51 50 57 56 B9 E6 8E 85 35 E8 ?? ?? ?? ?? FF D0 }
$hex{ 6A 40 68 00 10 00 00 52 6A 00 FF 75 E0 B9 E3 18 90 72 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: daab8e54-11b3-51cc-8bee-55b078f3e791

Metadata

version0.1

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