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SEKOIA_Infostealer_Win_Fwit_Strings

No description has been set in the source file - SEKOIA

GenericSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2023-06-22
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

No description has been set in the source file - SEKOIA

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

infostealer-win-fwit-strings.yarDetection Rule License 1.1
rule SEKOIA_Infostealer_Win_Fwit_Strings : FILE
{
	meta:
		description = "No description has been set in the source file - SEKOIA"
		author = "Sekoia.io"
		id = "332e89ad-d1fe-4da6-9354-0978ef173e78"
		date = "2023-06-22"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/infostealer_win_fwit_strings.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "4e28b6d67e2087b2f28817b19812b8bd56227175cd3d9c7037290127d4ec05a5"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "C:\\ProgramData\\Temp" wide
		$s2 = "{:08x}" wide
		$s3 = "CURL_SSLVERSION" ascii

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$s1text"C:\\ProgramData\\Temp"wide
$s2text"{:08x}"wide
$s3text"CURL_SSLVERSION"ascii

Condition

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

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • All patterns in the rule 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: 332e89ad-d1fe-4da6-9354-0978ef173e78

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE