YARA · SEKOIA.IO Community
SEKOIA_Ransomware_Win_Fonix
Detect the Fonix / XINOF ransomware by spotting its specific debug path
- 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:
= "Detect the Fonix / XINOF ransomware by spotting its specific debug path"
= "Sekoia.io"
= "b28467d5-69a0-4a8b-8938-8fdac2ae8d19"
= "2021-10-07"
= "2024-12-19"
= "https://github.com/SEKOIA-IO/Community"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/ransomware_win_fonix.yar#L1-L16"
= "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
= "2085fae62c07f63723a417566c204b0a9942de35ed80272d1486dc2c96ca0037"
= 75
= 80
= "FILE"
= "1.0"
= "TLP:CLEAR"
strings:
$s1 = "Ransomware\\Fonix" ascii
$s2 = "Release\\Fonix.pdb" ascii
condition:
uint16( 0 ) == 0x5A4D and all of them
}
Strings (2 patterns)
| Identifier | Type | Value | Modifiers |
|---|---|---|---|
| $s1 | text | "Ransomware\\Fonix" | ascii |
| $s2 | text | "Release\\Fonix.pdb" | ascii |
Condition
uint16( 0 ) == 0x5A4D and all of themIn plain words (Heuristic)
- The file must start with “MZ” — a Windows executable (PE).
- All patterns in the rule must match.
Test this rule in your browser
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References
Licence & attribution
Author: Sekoia.io
Source repository: SEKOIA.IO Community @ a438a5901a
Licence: Detection Rule License 1.1 (repository licence)
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
| version | 1.0 |
|---|---|
| classification | TLP:CLEAR |
Tags:FILE
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