YARA · SEKOIA.IO Community

SEKOIA_Zip_Win_Abcloader

Use the CRC32 to detect a zip containing the doc file used to drop and launch ABCloader

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

Author: Sekoia.io
Date: 2024-08-19
Modified: 2024-12-19
Score / Quality: 75 / 80

What this rule detects

Use the CRC32 to detect a zip containing the doc file used to drop and launch ABCloader

It defines 2 patterns (1 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

zip-win-abcloader.yarDetection Rule License 1.1

rule SEKOIA_Zip_Win_Abcloader
{
	meta:
		description = "Use the CRC32 to detect a zip containing the doc file used to drop and launch ABCloader"
		author = "Sekoia.io"
		id = "0d14b34a-9095-48fa-b616-4e8239f3b547"
		date = "2024-08-19"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/zip_win_abcloader.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "0c7d8e611781b29e15df415640858294"
		logic_hash = "024d068a86432f35b0f7af0c4cdccb37d0979d01e90f7c9d1ae8a2dddfa3bfc8"
		score = 75
		quality = 80
		tags = ""
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$crc = {32 56 27 e2}
		$name = "iden.doc"

	condition:
		$name at @crc [ 1 ] + 16
}

Strings (2 patterns)

Identifier	Type	Value	Modifiers
$crc	hex	{32 56 27 e2}
$name	text	"iden.doc"

Condition

$name at @crc [ 1 ] + 16

In plain words (Heuristic)

Pattern $name must be found at offset @crc.

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References

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

Sample hashes

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

0c7d8e611781b29e15df415640858294

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: 0d14b34a-9095-48fa-b616-4e8239f3b547

Metadata

version	1.0
classification	TLP:CLEAR

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