RANSOMWARE_RAA
YARA-2016-0196
Critical
general
Active
Identifes samples containing JS dropper similar to RAA ransomware.
RANSOMWARE_RAA.yar
Valid Syntax
rule RANSOMWARE_RAA {
meta:
description = "Identifes samples containing JS dropper similar to RAA ransomware."
author = "nshadov"
reference = "https://malwr.com/analysis/YmE4MDNlMzk2MjY3NDdlYWE1NzFiOTNlYzVhZTlkM2Y/"
date = "2016-06-15"
hash = "535494aa6ce3ccef7346b548da5061a9"
far = "unknown"
frr = "unknown"
strings:
$sp0 = "CryptoJS.AES.decrypt" fullword ascii
$sp1 = "RAA-SEP" fullword ascii
$sb0 = "ActiveXObject(\"Scriptlet.TypeLib\")" fullword ascii
$sb1 = "ActiveXObject(\"Scripting.FileSystemObject\")" fullword ascii
$sb2 = "WScript.CreateObject(\"WScript.Shell\");" fullword ascii
condition:
filesize > 10KB and filesize < 800KB and ( (all of ($sp*)) or ( (all of ($sb*)) and 1 of ($sp*) ) )
}Rule Metadata
description
Identifes samples containing JS dropper similar to RAA ransomware.
author
nshadov
reference
https://malwr.com/analysis/YmE4MDNlMzk2MjY3NDdlYWE1NzFiOTNlYzVhZTlkM2Y/
date
2016-06-15
hash
535494aa6ce3ccef7346b548da5061a9
far
unknown
frr
unknown
String Definitions
{"name":"$sp0","value":"\"CryptoJS.AES.decrypt\" fullword ascii"}
{"name":"$sp1","value":"\"RAA-SEP\" fullword ascii"}
{"name":"$sb0","value":"\"ActiveXObject(\\\"Scriptlet.TypeLib\\\")\" fullword ascii"}
{"name":"$sb1","value":"\"ActiveXObject(\\\"Scripting.FileSystemObject\\\")\" fullword ascii"}
{"name":"$sb2","value":"\"WScript.CreateObject(\\\"WScript.Shell\\\");\" fullword ascii"}
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_RAA.yar /path/to/suspicious/file # Scan a directory recursively yara -r RANSOMWARE_RAA.yar /path/to/directory/ # Scan with metadata output yara -m RANSOMWARE_RAA.yar target_file # Scan process memory (Linux) yara RANSOMWARE_RAA.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='RANSOMWARE_RAA.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=RANSOMWARE_RAA.yar /path/to/scan
Rule Information
YARA ID
YARA-2016-0196
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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