YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_EXT_APT32_Goopdate_Installer

Detects APT32 installer side-loaded with goopdate.dll

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X

Author: Facebook
Date: 2021-02-25
Modified: 2023-12-05
Score / Quality: 75 / 85

What this rule detects

Detects APT32 installer side-loaded with goopdate.dll

It defines 5 patterns (3 text, 2 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.

ext-apt32-goopdate-installer.yarDetection Rule License 1.1

import "pe"

rule SIGNATURE_BASE_EXT_APT32_Goopdate_Installer
{
	meta:
		description = "Detects APT32 installer side-loaded with goopdate.dll"
		author = "Facebook"
		id = "08f3cbda-ccb7-517a-b205-5f71de26c735"
		date = "2021-02-25"
		modified = "2023-12-05"
		reference = "https://about.fb.com/news/2020/12/taking-action-against-hackers-in-bangladesh-and-vietnam/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_apt32.yar#L3-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "69730f2c2bb9668a17f8dfa1f1523e0e1e997ba98f027ce98f5cbaa869347383"
		logic_hash = "1dcb3009c5c19ff4e54d82d3a4b99b3431e78664f1660522a781e815d96958c4"
		score = 75
		quality = 85
		tags = ""

	strings:
		$s0 = { 68 ?? ?? ?? ?? 57 A3 ?? ?? ?? ?? FF D6 33 05 ?? ?? ?? ?? }
		$s1 = "GetProcAddress"
		$s2 = { 8B 4D FC ?? ?? 0F B6 51 0C ?? ?? 8B 4D F0 0F B6 1C 01 33 DA }
		$s3 = "FindNextFileW"
		$s4 = "Process32NextW"

	condition:
		(pe.is_64bit ( ) or pe.is_32bit ( ) ) and all of them
}

Strings (5 patterns)

Identifier	Type	Value
$s0	hex	{ 68 ?? ?? ?? ?? 57 A3 ?? ?? ?? ?? FF D6 33 05 ?? ?? ?? ?? }
$s1	text	"GetProcAddress"
$s2	hex	{ 8B 4D FC ?? ?? 0F B6 51 0C ?? ?? 8B 4D F0 0F B6 1C 01 33 DA }
$s3	text	"FindNextFileW"
$s4	text	"Process32NextW"

Condition

(pe.is_64bit ( ) or pe.is_32bit ( ) ) and all of them

In plain words (Heuristic)

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

Test this rule in your browser

Drop a file to scan it with this rule using YARA-X compiled to WebAssembly. Nothing is uploaded.

Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

Open in editor

References

https://about.fb.com/news/2020/12/taking-action-against-hackers-in-bangladesh-and-vietnam/

Sample hashes

Hashes of samples the author lists in the rule's meta (look them up in your threat-intelligence platform).

69730f2c2bb9668a17f8dfa1f1523e0e1e997ba98f027ce98f5cbaa869347383

Licence & attribution

Author: Facebook

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: 08f3cbda-ccb7-517a-b205-5f71de26c735

SIGNATURE_BASE_EXT_APT32_Osx_Backdoor_Loader
APT / threat actorSignature Base (Florian Roth / Nextron)· Facebook· 2021-02-25