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SEKOIA_Tool_Inswor_Strings

Detects In-Swor based on strings

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-09-09
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects In-Swor based on strings

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

tool-inswor-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Inswor_Strings : FILE
{
	meta:
		description = "Detects In-Swor based on strings"
		author = "Sekoia.io"
		id = "99aaad33-510a-41b9-9022-800588c18d6d"
		date = "2024-09-09"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_inswor_strings.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "c393128a143b2a3397100b4a30c75112"
		logic_hash = "b25072e6a9fa5728c24c91056a221778f5fbc9d8ba7a78a6684cd6755761373e"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "open encrypted file error:" ascii
		$ = "open config file error:" ascii
		$ = "payload.ini" ascii

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

Strings (3 patterns)

IdentifierTypeValueModifiers
$text"open encrypted file error:"ascii
$text"open config file error:"ascii
$text"payload.ini"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

Sample hashes

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

  • c393128a143b2a3397100b4a30c75112

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: 99aaad33-510a-41b9-9022-800588c18d6d

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE