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SEKOIA_Infostealer_Win_Vidar_Strings_Nov23

Finds Vidar samples based on the specific strings

MalwareVidarSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-11-10
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Finds Vidar samples based on the specific strings

Associated malware family: Vidar.

Targets: Windows PE.

It defines 18 patterns (18 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

infostealer-win-vidar-strings-nov23.yarDetection Rule License 1.1
rule SEKOIA_Infostealer_Win_Vidar_Strings_Nov23 : FILE
{
	meta:
		description = "Finds Vidar samples based on the specific strings"
		author = "Sekoia.io"
		id = "b2c17627-f9b8-4401-b657-1cce560edc76"
		date = "2023-11-10"
		modified = "2024-12-19"
		reference = "https://twitter.com/crep1x/status/1722652451319202242"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/infostealer_win_vidar_strings_nov23.yar#L1-L33"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "1a2fc421fb4058b78de28d97d69b126e685f7677b7998f5b6ae3cbcee0ef3f00"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$str01 = "MachineID:" ascii
		$str02 = "Work Dir: In memory" ascii
		$str03 = "[Hardware]" ascii
		$str04 = "VideoCard:" ascii
		$str05 = "[Processes]" ascii
		$str06 = "[Software]" ascii
		$str07 = "information.txt" ascii
		$str08 = "%s\\*" ascii
		$str09 = "Select * From AntiVirusProduct" ascii
		$str10 = "SELECT target_path, tab_url from downloads" ascii
		$str11 = "Software\\Martin Prikryl\\WinSCP 2\\Configuration" ascii
		$str12 = "UseMasterPassword" ascii
		$str13 = "Soft: WinSCP" ascii
		$str14 = "<Pass encoding=\"base64\">" ascii
		$str15 = "Soft: FileZilla" ascii
		$str16 = "passwords.txt" ascii
		$str17 = "build_id" ascii
		$str18 = "file_data" ascii

	condition:
		uint16( 0 ) == 0x5A4D and 10 of ( $str* )
}

Strings (18 patterns)

IdentifierTypeValueModifiers
$str01text"MachineID:"ascii
$str02text"Work Dir: In memory"ascii
$str03text"[Hardware]"ascii
$str04text"VideoCard:"ascii
$str05text"[Processes]"ascii
$str06text"[Software]"ascii
$str07text"information.txt"ascii
$str08text"%s\\*"ascii
$str09text"Select * From AntiVirusProduct"ascii
$str10text"SELECT target_path, tab_url from downloads"ascii
$str11text"Software\\Martin Prikryl\\WinSCP 2\\Configuration"ascii
$str12text"UseMasterPassword"ascii
$str13text"Soft: WinSCP"ascii
$str14text"<Pass encoding=\"base64\">"ascii
$str15text"Soft: FileZilla"ascii
$str16text"passwords.txt"ascii
$str17text"build_id"ascii
$str18text"file_data"ascii

Condition

uint16( 0 ) == 0x5A4D and 10 of ( $str* )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • At least 10 patterns in ( $str* ) must match.

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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: b2c17627-f9b8-4401-b657-1cce560edc76

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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