YARA · SEKOIA.IO Community

SEKOIA_Bumblebee_Loader

Detect the BUMBLEBEE loader

MalwareBumbleBeeSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X

Author: Sekoia.io
Date: 2022-05-23
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Detect the BUMBLEBEE loader

Associated malware family: BumbleBee.

Targets: Windows PE.

It defines 4 patterns (3 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

bumblebee-loader.yarDetection Rule License 1.1

rule SEKOIA_Bumblebee_Loader : FILE
{
	meta:
		description = "Detect the BUMBLEBEE loader"
		author = "Sekoia.io"
		id = "8fd795c7-6896-498c-a892-de9da6427b60"
		date = "2022-05-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/bumblebee_loader.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "73c0195c51b5f8c36ab6d7a0e783f1229709d51fc42e2486c02fa65bbbdf955b"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$str0 = { 5a 00 3a 00 5c 00 68 00 6f 00 6f 00 6b 00 65 00 72 00 32 00 5c 00 43 00 6f 00 6d 00 6d 00 6f 00 6e 00 5c 00 6d 00 64 00 35 00 2e 00 63 00 70 00 70 00 }
		$str1 = "/gate" ascii
		$str2 = "3C29FEA2-6FE8-4BF9-B98A-0E3442115F67" wide
		$str3 = "BLACK" ascii

	condition:
		uint16be( 0 ) == 0x4d5a and 3 of them
}

Strings (4 patterns)

Identifier	Type	Value	Modifiers
$str0	hex	{ 5a 00 3a 00 5c 00 68 00 6f 00 6f 00 6b 00 65 00 72 00 32 00 5c 00 43 00 6f 00 6d 00 6d 00 6f 00 6e 00 5c 00 6d 00 64 00 35 00 2e 00 63 00 70 00 70 00 }
$str1	text	"/gate"	ascii
$str2	text	"3C29FEA2-6FE8-4BF9-B98A-0E3442115F67"	wide
$str3	text	"BLACK"	ascii

Condition

uint16be( 0 ) == 0x4d5a and 3 of them

In plain words (Heuristic)

The file must start with “MZ” — a Windows executable (PE).
At least 3 patterns 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

https://github.com/SEKOIA-IO/Community

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

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: 8fd795c7-6896-498c-a892-de9da6427b60

Metadata

version	1.0
classification	TLP:CLEAR

Tags:FILE

SEKOIA_Loader_Win_Bumblebee
MalwareSEKOIA.IO Community· Sekoia.io· 2022-04-08
MALPEDIA_Win_Bumblebee_Auto
MalwareMalpedia signator rules· Felix Bilstein - yara-signator at cocacoding dot com· 2026-05-04
CAPE_Bumblebee
MalwareCAPE Sandbox (CAPEv2)· enzo & kevoreilly· 2022-04-21
CAPE_Bumblebee2024
MalwareCAPE Sandbox (CAPEv2)· enzok· 2022-04-21
CAPE_Bumblebeeshellcode_1
MalwareCAPE Sandbox (CAPEv2)· kevoreilly· 2022-04-21
CHECK_POINT_Malware_Bumblebee_PackedMetadata only
MalwareCheck Point (via Open-Source-YARA-rules)· Marc Salinas @ CheckPoint Research· 2022-07-13
SEKOIA_Downloader_Kimsuky_Lnk
MalwareSEKOIA.IO Community· Sekoia.io· 2024-07-16
SEKOIA_Downloader_Win_Cobianrat
MalwareSEKOIA.IO Community· Sekoia.io· 2024-08-23

More BumbleBee rules