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SEKOIA_Ransomware_Win_Fonix

Detect the Fonix / XINOF ransomware by spotting its specific debug path

MalwareFonixSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2021-10-07
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detect the Fonix / XINOF ransomware by spotting its specific debug path

Associated malware family: Fonix.

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

ransomware-win-fonix.yarDetection Rule License 1.1
rule SEKOIA_Ransomware_Win_Fonix : FILE
{
	meta:
		description = "Detect the Fonix / XINOF ransomware by spotting its specific debug path"
		author = "Sekoia.io"
		id = "b28467d5-69a0-4a8b-8938-8fdac2ae8d19"
		date = "2021-10-07"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/ransomware_win_fonix.yar#L1-L16"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "2085fae62c07f63723a417566c204b0a9942de35ed80272d1486dc2c96ca0037"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "Ransomware\\Fonix" ascii
		$s2 = "Release\\Fonix.pdb" ascii

	condition:
		uint16( 0 ) == 0x5A4D and all of them
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$s1text"Ransomware\\Fonix"ascii
$s2text"Release\\Fonix.pdb"ascii

Condition

uint16( 0 ) == 0x5A4D 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: b28467d5-69a0-4a8b-8938-8fdac2ae8d19

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE

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