Full Report
Researchers uncovered a new campaign using Muhstik malware to target Apache RocketMQ, a distributed messaging platform, exploiting a remote code execution vulnerability (CVE-2023-33246). Attackers use this vulnerability to download and execute Muhstik malware on compromised in...
Analysis Summary
# Tool/Technique: Muhstik Malware (Apache RocketMQ Campaign)
## Overview
Muhstik is a long-standing botnet and worm-like malware family primarily known for targeting Linux-based IoT devices and servers. In this specific campaign, threat actors are leveraging a critical remote code execution (RCE) vulnerability in Apache RocketMQ to expand their botnet, typically for the purpose of launching Distributed Denial of Service (DDoS) attacks and mining cryptocurrency.
## Technical Details
- **Type:** Malware Family (Botnet / Worm)
- **Platform:** Linux (various architectures including x86, ARM, MIPS)
- **Capabilities:** DDoS orchestration, cryptocurrency mining, self-propagation, IRC-based Command and Control (C2).
- **First Seen:** Approximately 2018 (Current campaign targeting RocketMQ identified in 2023/2024).
## MITRE ATT&CK Mapping
- **TA0001 - Initial Access**
- T1190 - Exploit Public-Facing Application (CVE-2023-33246)
- **TA0002 - Execution**
- T1059.004 - Command and Scripting Interpreter: Unix Shell
- **TA0003 - Persistence**
- T1543.002 - Create or Modify System Process: Systemd Service
- **TA0011 - Command and Control**
- T1071.001 - Application Layer Protocol: Web Protocols (HTTP)
- T1071.002 - Application Layer Protocol: File Transfer Protocols (FTP)
- T1203 - Exploitation for Client Execution
- **TA0040 - Impact**
- T1498 - Network Denial of Service
- T1496 - Resource Hijacking (Cryptojacking)
## Functionality
### Core Capabilities
- **Exploitation:** Automatically scans for and exploits CVE-2023-33246 in Apache RocketMQ version 5.1.0 and below.
- **Botnet Recruitment:** Connects to IRC channels to receive commands from a centralized C2 server.
- **DDoS Attacks:** Capable of launching various flood attacks (TCP, UDP, HTTP) against target infrastructure.
- **Payload Delivery:** Uses `curl` or `wget` to fetch architecture-specific binary payloads from remote servers.
### Advanced Features
- **Worm-like Propagation:** Includes modules to scan the local network and the internet for other vulnerable services (e.g., Drupal, WebLogic, RocketMQ) to spread autonomously.
- **Multi-Architecture Support:** Compiled for multiple CPU architectures to ensure compatibility across diverse IoT and server environments.
## Indicators of Compromise
- **Vulnerability:** CVE-2023-33246 (Apache RocketMQ RCE)
- **File Names:** `pty1`, `pty2`, `pty3`, `dk86`
- **Network Indicators:**
- `161[.]35[.]186[.]195`
- `159[.]203[.]40[.]236`
- `128[.]199[.]4[.]181`
- `irc[.]muhstik[.]com` (Defanged)
- **Behavioral Indicators:**
- Execution of `sh` or `bash` commands originating from the `mqbroker` process.
- Outbound connections on port 6667 (IRC).
- Unexplained high CPU usage consistent with XMRig/cryptomining.
## Associated Threat Actors
- **Muhstik Gang:** A financially motivated group known for maintaining the Muhstik botnet.
## Detection Methods
- **Signature-based detection:** Antivirus (AV) and Endpoint Detection and Response (EDR) signatures for known Muhstik binaries and the XMRig miner.
- **Behavioral detection:** Monitor for Apache RocketMQ child processes spawning shell environments or executing network-fetching commands (`curl`, `wget`, `tftp`).
- **Network Monitoring:** Alert on IRC protocol traffic (port 6667) originating from data center or cloud environments.
## Mitigation Strategies
- **Patch Management:** Immediately upgrade Apache RocketMQ to version 5.1.1 or higher to remediate CVE-2023-33246.
- **Network Segmentation:** Limit the exposure of RocketMQ NameServer and Broker components to the public internet using firewalls or VPNs.
- **Principle of Least Privilege:** Run the RocketMQ service under a non-privileged user account to limit the impact of a successful exploit.
## Related Tools/Techniques
- **Mirai:** Shares similar botnet distribution and DDoS objectives.
- **XMRig:** Often bundled with Muhstik for Monero mining.
- **Tsunami (Kaiten):** Underlying IRC-based botnet code often modified by Muhstik authors.