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SEKOIA_Apt_Implant_Xdealer_Vbs_Launcher_Strings

Detects XDealer VBS Launcher

APT / threat actorSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-03-22
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects XDealer VBS Launcher

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

Summary generated from the rule's metadata and condition.

Rule source

apt-implant-xdealer-vbs-launcher-strings.yarDetection Rule License 1.1
rule SEKOIA_Apt_Implant_Xdealer_Vbs_Launcher_Strings : FILE
{
	meta:
		description = "Detects XDealer VBS Launcher"
		author = "Sekoia.io"
		id = "ebfc8a33-70dc-44d5-bc4a-07afc56f8254"
		date = "2024-03-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_implant_xdealer_vbs_launcher_strings.yar#L1-L17"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "e206189fd21ed7b3bf48a51d955df9055b7f7aa502b7fac52b274cc414adea0d"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "Dim objws"
		$s2 = "Set objws="
		$s3 = "objws.Run \"\"\"C:\\ProgramData\\"

	condition:
		$s1 at 0 and all of them and filesize < 200
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"Dim objws"
$s2text"Set objws="
$s3text"objws.Run \"\"\"C:\\ProgramData\\"

Condition

$s1 at 0 and all of them and filesize < 200

In plain words (Heuristic)

  • The file must be smaller than 200 (a cheap guard that skips large files).
  • All patterns in the rule must match.
  • Pattern $s1 must be found at offset 0.

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References

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: ebfc8a33-70dc-44d5-bc4a-07afc56f8254

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE