Ransomware_Win_DARKSIDE_v1__1
YARA-2025-1175
Critical
general
Active
Detection for early versions of DARKSIDE ransomware samples based on the encryption mode configuration values
Ransomware_Win_DARKSIDE_v1__1.yar
Valid Syntax
rule Ransomware_Win_DARKSIDE_v1__1
{
meta:
author = "FireEye"
reference = "https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations"
date_created = "2021-03-22"
description = "Detection for early versions of DARKSIDE ransomware samples based on the encryption mode configuration values"
md5 = "1a700f845849e573ab3148daef1a3b0b"
strings:
$consts = { 80 3D [4] 01 [1-10] 03 00 00 00 [1-10] 03 00 00 00 [1-10] 00 00 04 00 [1-10] 00 00 00 00 [1-30] 80 3D [4] 02 [1-10] 03 00 00 00 [1-10] 03 00 00 00 [1-10] FF FF FF FF [1-10] FF FF FF FF [1-30] 03 00 00 00 [1-10] 03 00 00 00 }
condition:
(uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550) and $consts
}
Rule Metadata
author
FireEye
reference
https://www.mandiant.com/resources/shining-a-light-on-darkside-ransomware-operations
date_created
2021-03-22
description
Detection for early versions of DARKSIDE ransomware samples based on the encryption mode configuration values
md5
1a700f845849e573ab3148daef1a3b0b
String Definitions
{"name":"$consts","value":"{ 80 3D [4] 01 [1-10] 03 00 00 00 [1-10] 03 00 00 00 [1-10] 00 00 04 00 [1-10] 00 00 00 00 [1-30] 80 3D [4] 02 [1-10] 03 00 00 00 [1-10] 03 00 00 00 [1-10] FF FF FF FF [1-10] FF FF FF FF [1-30] 03 00 00 00 [1-10] 03 00 00 00 }"}
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: Critical
The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.
Detection Capabilities
- File-based detection for executables and documents
- Memory scanning for running processes
- Network traffic analysis support
Command Line Usage
# Scan a single file yara Ransomware_Win_DARKSIDE_v1__1.yar /path/to/suspicious/file # Scan a directory recursively yara -r Ransomware_Win_DARKSIDE_v1__1.yar /path/to/directory/ # Scan with metadata output yara -m Ransomware_Win_DARKSIDE_v1__1.yar target_file # Scan process memory (Linux) yara Ransomware_Win_DARKSIDE_v1__1.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='Ransomware_Win_DARKSIDE_v1__1.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=Ransomware_Win_DARKSIDE_v1__1.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1175
Author
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
Critical
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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