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CAPE_Zloader_2024

Zloader Registry and Modulename Bypass

GenericCAPE Sandbox (CAPEv2)GNU General Public License v3.0Compiles with YARA-X
Author
enzok
Date
2021-03-12
Modified
2024-05-03
Score / Quality
75 / 70

What this rule detects

Zloader Registry and Modulename Bypass

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
zloader-2024.yarGNU General Public License v3.0
rule CAPE_Zloader_2024 : FILE
{
	meta:
		description = "Zloader Registry and Modulename Bypass"
		author = "enzok"
		id = "7100c27e-021f-552c-9a75-84b07a2f837e"
		date = "2021-03-12"
		modified = "2024-05-03"
		reference = "https://github.com/kevoreilly/CAPEv2"
		source_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/analyzer/windows/data/yara/Zloader.yar#L14-L26"
		license_url = "https://github.com/kevoreilly/CAPEv2/blob/6b15e76f28cd83fd1187da6c9aaaad2174255356/LICENSE"
		logic_hash = "38d555ef5f613cf7ca043697c479100a7a22e7f043acf8b6a46f8009eb92fd7e"
		score = 75
		quality = 70
		tags = "FILE"
		cape_options = "bp0=$reg_1*+1,bp0=$reg_2*+1,action0=seteax:1,count=0"

	strings:
		$reg_1 = {FF D0 83 F8 00 0F 94 C0 24 01 88 44 24 ?? 4? 8B [3] B? [9-25] E8 [4] 4? 89 F1 FF D0 8A [3] 24 01 0F B6 C0}
		$reg_2 = {B9 [4] E8 [4] 8B [3] 89 C2 E8 [4] 4? [4] ff D0 8A [3] 24 01 0F B6 C0}
		$name_1 = {56 5? 5? 4? 81 EC [4] C7 44 24 ?? 00 00 00 00 4? 8D 0D [4] E8 [4] 4? 89 [3] 4? 83 [3] 00 75}

	condition:
		uint16( 0 ) == 0x5A4D and 2 of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$reg_1hex{FF D0 83 F8 00 0F 94 C0 24 01 88 44 24 ?? 4? 8B [3] B? [9-25] E8 [4] 4? 89 F1 FF D0 8A [3] 24 01 0F B6 C0}
$reg_2hex{B9 [4] E8 [4] 8B [3] 89 C2 E8 [4] 4? [4] ff D0 8A [3] 24 01 0F B6 C0}
$name_1hex{56 5? 5? 4? 81 EC [4] C7 44 24 ?? 00 00 00 00 4? 8D 0D [4] E8 [4] 4? 89 [3] 4? 83 [3] 00 75}

Condition

uint16( 0 ) == 0x5A4D and 2 of them

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 2 patterns in the rule must match.

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References

Licence & attribution

Author: enzok

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: 7100c27e-021f-552c-9a75-84b07a2f837e

Metadata

cape_optionsbp0=$reg_1*+1,bp0=$reg_2*+1,action0=seteax:1,count=0

Tags:FILE

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