BabukRansomwareV3
YARA-2021-0172
Critical
general
Active
YARA rule for Babuk Ransomware v3
BabukRansomwareV3.yar
Valid Syntax
rule BabukRansomwareV3 {
meta:
description = "YARA rule for Babuk Ransomware v3"
reference = "http://chuongdong.com/reverse%20engineering/2021/01/16/BabukRansomware-v3/"
author = "@cPeterr"
date = "2021-01-16"
rule_version = "v3"
malware_type = "ransomware"
tlp = "white"
strings:
$lanstr1 = "-lanfirst"
$lanstr2 = "-nolan"
$lanstr3 = "shares"
$str1 = "BABUK LOCKER"
$str2 = "babukq4e2p4wu4iq.onion"
$str3 = "How To Restore Your Files.txt" wide
$str4 = "babuk_v3"
$str5 = ".babyk" wide
condition:
all of ($str*) and all of ($lanstr*)
}
Rule Metadata
description
YARA rule for Babuk Ransomware v3
reference
http://chuongdong.com/reverse%20engineering/2021/01/16/BabukRansomware-v3/
author
@cPeterr
date
2021-01-16
rule_version
v3
malware_type
ransomware
tlp
white
String Definitions
{"name":"$lanstr1","value":"\"-lanfirst\""}
{"name":"$lanstr2","value":"\"-nolan\""}
{"name":"$lanstr3","value":"\"shares\""}
{"name":"$str1","value":"\"BABUK LOCKER\""}
{"name":"$str2","value":"\"babukq4e2p4wu4iq.onion\""}
{"name":"$str3","value":"\"How To Restore Your Files.txt\" wide"}
{"name":"$str4","value":"\"babuk_v3\""}
{"name":"$str5","value":"\".babyk\" wide"}
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 BabukRansomwareV3.yar /path/to/suspicious/file # Scan a directory recursively yara -r BabukRansomwareV3.yar /path/to/directory/ # Scan with metadata output yara -m BabukRansomwareV3.yar target_file # Scan process memory (Linux) yara BabukRansomwareV3.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='BabukRansomwareV3.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=BabukRansomwareV3.yar /path/to/scan
Rule Information
YARA ID
YARA-2021-0172
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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