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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_TH_APT_UNC4736_Tradingtech_Cert_Apr23_1

Threat hunting rule that detects samples signed with the compromised Trading Technologies certificate after May 2022

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2023-04-20
Modified
2023-12-05
Score / Quality
65 / 85

What this rule detects

Threat hunting rule that detects samples signed with the compromised Trading Technologies certificate after May 2022

Targets: Windows PE.

It defines 3 patterns (2 text, 1 hex, 0 regex). YARA modules used: pe.

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

susp-th-apt-unc4736-tradingtech-cert-apr23-1.yarDetection Rule License 1.1
import "pe"

rule SIGNATURE_BASE_SUSP_TH_APT_UNC4736_Tradingtech_Cert_Apr23_1
{
	meta:
		description = "Threat hunting rule that detects samples signed with the compromised Trading Technologies certificate after May 2022"
		author = "Florian Roth"
		id = "9a05fba9-9466-5b69-9207-27ad01d6eb8b"
		date = "2023-04-20"
		modified = "2023-12-05"
		reference = "https://www.mandiant.com/resources/blog/3cx-software-supply-chain-compromise"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_nk_tradingtech_apr23.yar#L227-L242"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "47941828b3c18ed39eddacbc73e147651a9bd48e1a0f7b9847ff1d4c6fea6afd"
		score = 65
		quality = 85
		tags = ""

	strings:
		$s1 = { 00 85 38 A6 C5 01 8F 50 FC }
		$s2 = "Go Daddy Secure Certificate Authority - G2"
		$s3 = "Trading Technologies International, Inc"

	condition:
		pe.timestamp> 1651363200 and all of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1hex{ 00 85 38 A6 C5 01 8F 50 FC }
$s2text"Go Daddy Secure Certificate Authority - G2"
$s3text"Trading Technologies International, Inc"

Condition

pe.timestamp> 1651363200 and all of them

In plain words (Heuristic)

  • All patterns in the rule must match.
  • Uses the pe module.

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References

Licence & attribution

Author: Florian Roth

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: 9a05fba9-9466-5b69-9207-27ad01d6eb8b

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