MauiRansomware
YARA-2025-1448
Critical
general
Active
Detection for Maui Ransomware
MauiRansomware.yar
Valid Syntax
rule MauiRansomware
{
meta:
author= "Silas Cutler (Silas@Stairwell.com)"
description = "Detection for Maui Ransomware"
reference = "https://stairwell.com/wp-content/uploads/2022/07/Stairwell-Threat-Report-Maui-Ransomware.pdf"
version = "0.1"
strings:
$ = "Unable to read public key info." wide
$ = "it by <Godhead> using -maui option." wide
$ = "Incompatible public key version." wide
$ = "maui.key" wide
$ = "maui.evd" wide
$ = "Unable to encrypt private key" wide
$ = "Unable to create evidence file" wide
$ = "PROCESS_GOINGON[%d%% / %d%%]: %s" wide
$ = "demigod.key" wide
$ = "Usage: maui [-ptx] [PATH]" wide
$ = "-p dir: Set Log Directory (Default: Current Directory)" wide
$ = "-t n: Set Thread Count (Default: 1)" wide
$ = "-x: Self Melt (Default: No)" wide
// File header loading (x32-bit)
$ = { 44 24 24 44 49 56 45 ?? 44 24 28 01 00 00 00 ?? 44 24 2C 10 00 00 00 }
$ = { 44 4F 47 44 ?? ?? 04 01 00 00 00 }
condition:
3 of them or
(
uint32(filesize-8) == 0x00000001 and
uint32(filesize-12) == 0x5055424B
)
}
Rule Metadata
author
Silas Cutler (Silas@Stairwell.com)
description
Detection for Maui Ransomware
reference
https://stairwell.com/wp-content/uploads/2022/07/Stairwell-Threat-Report-Maui-Ransomware.pdf
version
0.1
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 MauiRansomware.yar /path/to/suspicious/file # Scan a directory recursively yara -r MauiRansomware.yar /path/to/directory/ # Scan with metadata output yara -m MauiRansomware.yar target_file # Scan process memory (Linux) yara MauiRansomware.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='MauiRansomware.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=MauiRansomware.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1448
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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