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CAPE_Qakbot5_1

QakBot WMI anti-anti-vm

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 WMI anti-anti-vm

Associated malware family: Qakbot.

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
qakbot5-1.yarGNU General Public License v3.0
rule CAPE_Qakbot5_1 : FILE
{
	meta:
		description = "QakBot WMI anti-anti-vm"
		author = "kevoreilly"
		id = "d287b043-15df-5865-ad4c-9eb64ceec04c"
		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#L1-L13"
		license_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/LICENSE"
		logic_hash = "303ea2d8d1a7f0fd0ca5508dae2c1b83c03b1e3e975760f15d36d93bcc152767"
		score = 75
		quality = 70
		tags = "FILE"
		cape_options = "bp0=$loop+35,action0=skip,count=0"
		packed = "f4bb0089dcf3629b1570fda839ef2f06c29cbf846c5134755d22d419015c8bd2"

	strings:
		$loop = {8B 75 ?? 48 8B 4C [2] FF 15 [4] 48 8B 4C [2] 48 8B 01 FF 50 ?? 8B DE 48 8B 4C [2] 48 85 C9 0F 85 [4] EB 4E}
		$conf = {0F B7 1D [4] B9 [2] 00 00 E8 [4] 8B D3 48 89 45 ?? 45 33 C9 48 8D 0D [4] 4C 8B C0 48 8B F8 E8}

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

Strings (2 patterns)

IdentifierTypeValueModifiers
$loophex{8B 75 ?? 48 8B 4C [2] FF 15 [4] 48 8B 4C [2] 48 8B 01 FF 50 ?? 8B DE 48 8B 4C [2] 48 85 C9 0F 85 [4] EB 4E}
$confhex{0F B7 1D [4] B9 [2] 00 00 E8 [4] 8B D3 48 89 45 ?? 45 33 C9 48 8D 0D [4] 4C 8B C0 48 8B F8 E8}

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.

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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: d287b043-15df-5865-ad4c-9eb64ceec04c

Metadata

cape_optionsbp0=$loop+35,action0=skip,count=0
packedf4bb0089dcf3629b1570fda839ef2f06c29cbf846c5134755d22d419015c8bd2

Tags:FILE

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