Skip to content
yararules.org
Menu

YARA · CAPE Sandbox (CAPEv2)

CAPE_Qakbot4_1

QakBot Config Extraction

MalwareQakbotCAPE Sandbox (CAPEv2)GNU General Public License v3.0Compiles with YARA-X
Author
kevoreilly
Date
2022-03-16
Modified
2024-02-16
Score / Quality
75 / 70

What this rule detects

QakBot Config Extraction

Associated malware family: Qakbot.

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
qakbot4-1.yarGNU General Public License v3.0
rule CAPE_Qakbot4_1 : FILE
{
	meta:
		description = "QakBot Config Extraction"
		author = "kevoreilly"
		id = "401184cf-bbd7-5afe-9589-470f54721af1"
		date = "2022-03-16"
		modified = "2024-02-16"
		reference = "https://github.com/kevoreilly/CAPEv2"
		source_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/analyzer/windows/data/yara/QakBot.yar#L15-L29"
		license_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/LICENSE"
		logic_hash = "ad75b07b9b786f634fd46cbe6dc089d3f732673320e70714e8ab058f0392c9f5"
		score = 75
		quality = 70
		tags = "FILE"
		cape_options = "bp0=$params+23,action0=setdump:eax::ecx,bp1=$c2list1+40,bp1=$c2list2+38,action1=dump,bp2=$conf+13,action2=dump,count=1,typestring=QakBot Config"
		packed = "f084d87078a1e4b0ee208539c53e4853a52b5698e98f0578d7c12948e3831a68"

	strings:
		$params = {8B 7D ?? 8B F1 57 89 55 ?? E8 [4] 8D 9E [2] 00 00 89 03 59 85 C0 75 08 6A FC 58 E9}
		$c2list1 = {59 59 8D 4D D8 89 45 E0 E8 [4] 8B 45 E0 85 C0 74 ?? 8B 90 [2] 00 00 51 8B 88 [2] 00 00 6A 00 E8}
		$c2list2 = {59 59 8B F8 8D 4D ?? 89 7D ?? E8 [4] 85 FF 74 52 8B 97 [2] 00 00 51 8B 8F [2] 00 00 53 E8}
		$conf = {5F 5E 5B C9 C3 51 6A 00 E8 [4] 59 59 85 C0 75 01 C3}

	condition:
		uint16( 0 ) == 0x5A4D and any of them
}

Strings (4 patterns)

IdentifierTypeValueModifiers
$paramshex{8B 7D ?? 8B F1 57 89 55 ?? E8 [4] 8D 9E [2] 00 00 89 03 59 85 C0 75 08 6A FC 58 E9}
$c2list1hex{59 59 8D 4D D8 89 45 E0 E8 [4] 8B 45 E0 85 C0 74 ?? 8B 90 [2] 00 00 51 8B 88 [2] 00 00 6A 00 E8}
$c2list2hex{59 59 8B F8 8D 4D ?? 89 7D ?? E8 [4] 85 FF 74 52 8B 97 [2] 00 00 51 8B 8F [2] 00 00 53 E8}
$confhex{5F 5E 5B C9 C3 51 6A 00 E8 [4] 59 59 85 C0 75 01 C3}

Condition

uint16( 0 ) == 0x5A4D and any of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least one pattern in the rule must match.

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

Licence & attribution

Author: kevoreilly

Source repository: CAPE Sandbox (CAPEv2) @ 6b15e76f28

Licence: GNU General Public License v3.0 (repository licence)

Copyright notice: Cuckoo Sandbox is copyrighted by the Cuckoo Foundation.

Original rule

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

Rule id: 401184cf-bbd7-5afe-9589-470f54721af1

Metadata

cape_optionsbp0=$params+23,action0=setdump:eax::ecx,bp1=$c2list1+40,bp1=$c2list2+38,action1=dump,bp2=$conf+13,action2=dump,count=1,typestring=QakBot Config
packedf084d87078a1e4b0ee208539c53e4853a52b5698e98f0578d7c12948e3831a68

Tags:FILE

Related rules

More Qakbot rules