DarksideRansomware1_8_6_2
YARA-2025-1270
Critical
general
Active
YARA rule for Darkside v1.8.6.2
DarksideRansomware1_8_6_2.yar
Valid Syntax
rule DarksideRansomware1_8_6_2 {
meta:
description = "YARA rule for Darkside v1.8.6.2"
reference = "http://chuongdong.com/reverse%20engineering/2021/05/06/DarksideRansomware/"
author = "@cPeterr"
tlp = "white"
strings:
$hash_alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
$gen_key_buff = {89 54 0E 0C 89 44 0E 08 89 5C 0E 04 89 3C 0E 81 EA 10 10 10 10 2D 10 10 10 10 81 EB 10 10 10 10 81 EF 10 10 10 10 83 E9 10 79 D5}
$dyn_api_resolve = {FF 76 FC 56 E8 91 FE FF FF 56 E8 ?? 69 00 00 8B D8 FF 76 FC 56 E8 85 FB FF FF 8B 46 FC 8D 34 06 B9 23 00 00 00 E8 5E 02 00 00 AD}
$get_config_len = {81 3C 18 DE AD BE EF 75 02 EB 03 40 EB F2}
$RSA_1024_add_big_num = {8B 06 8B 5E 04 8B 4E 08 8B 56 0C 11 07 11 5F 04 11 4F 08 11 57 0C}
$CRC32_checksum = {FF 75 0C FF 75 08 68 EF BE AD DE FF 15 ?? ?? ?? 00 FF 75 0C FF 75 08 50 FF 15 ?? ?? ?? 00 31 07 FF 75 0C FF 75 08 50 FF 15 ?? ?? ?? 00 }
condition:
all of them
}
Rule Metadata
description
YARA rule for Darkside v1.8.6.2
reference
http://chuongdong.com/reverse%20engineering/2021/05/06/DarksideRansomware/
author
@cPeterr
tlp
white
String Definitions
{"name":"$hash_alphabet","value":"\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+\/\""}
{"name":"$gen_key_buff","value":"{89 54 0E 0C 89 44 0E 08 89 5C 0E 04 89 3C 0E 81 EA 10 10 10 10 2D 10 10 10 10 81 EB 10 10 10 10 81 EF 10 10 10 10 83 E9 10 79 D5}"}
{"name":"$dyn_api_resolve","value":"{FF 76 FC 56 E8 91 FE FF FF 56 E8 ?? 69 00 00 8B D8 FF 76 FC 56 E8 85 FB FF FF 8B 46 FC 8D 34 06 B9 23 00 00 00 E8 5E 02 00 00 AD}"}
{"name":"$get_config_len","value":"{81 3C 18 DE AD BE EF 75 02 EB 03 40 EB F2}"}
{"name":"$RSA_1024_add_big_num","value":"{8B 06 8B 5E 04 8B 4E 08 8B 56 0C 11 07 11 5F 04 11 4F 08 11 57 0C}"}
{"name":"$CRC32_checksum","value":"{FF 75 0C FF 75 08 68 EF BE AD DE FF 15 ?? ?? ?? 00 FF 75 0C FF 75 08 50 FF 15 ?? ?? ?? 00 31 07 FF 75 0C FF 75 08 50 FF 15 ?? ?? ?? 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 DarksideRansomware1_8_6_2.yar /path/to/suspicious/file # Scan a directory recursively yara -r DarksideRansomware1_8_6_2.yar /path/to/directory/ # Scan with metadata output yara -m DarksideRansomware1_8_6_2.yar target_file # Scan process memory (Linux) yara DarksideRansomware1_8_6_2.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='DarksideRansomware1_8_6_2.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=DarksideRansomware1_8_6_2.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1270
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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