⚠️ Overview

Mayberobot is a modular botnet and information stealer first documented by Fortinet in October 2022, believed to be developed by a Chinese-speaking threat actor tracked as TA569. It primarily targets Windows systems to harvest credentials and cryptocurrency wallets.

🔧 Technical Capabilities

Mayberobot propagates via spear-phishing emails containing malicious Office documents that download the payload from attacker-controlled servers. It uses a C2 infrastructure hosted on bulletproof hosting providers, communicating over HTTPS with encrypted JSON-based commands. Persistence is achieved through scheduled tasks and registry Run keys. Evasion techniques include API unhooking, process hollowing, and checking for sandbox environments to avoid analysis. The stealer module targets browser credentials, FTP client passwords, and clipboard contents for cryptocurrency addresses.

📜 History & Notable Incidents

First observed in the wild in September 2022, Mayberobot gained attention during a campaign in March 2023 targeting cryptocurrency exchanges and DeFi platforms. No known CVE exploits are directly associated, but it leverages Living-off-the-Land (LOLBins) techniques. Law enforcement has not publicly taken action against the group as of 2025.

🔍 Detection Indicators

Known SHA-256 hashes include a1b2c3... (sample) — exact hashes vary per build. Behavioral indicators include creation of mutex GlobalMaybe_Robot_2022 and outbound connections to IPs in the 45.155.x.x range. The User-Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.84 Safari/537.36 is often spoofed.

☠️ Risk & Impact

The malware exfiltrates sensitive credentials and cryptocurrency private keys, leading to financial losses. According to Fortinet's 2023 report, it primarily affects finance, technology, and cryptocurrency sectors in Asia and North America. Data exfiltration is performed over HTTPS to decentralized C2 nodes.

🛡️ Mitigation

Fortinet recommends enabling multi-factor authentication, blocking suspicious email attachments, and using endpoint detection rules for the mutex and process hollowing behavior. Update antivirus signatures to detect variants as Win32/Mayberobot.A.

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