⚠️ Overview

MyloBot is a sophisticated malware-as-a-service (MaaS) loader first documented by Cybereason in 2023. It is primarily used as a first-stage dropper for ransomware, information stealers, and remote access trojans (RATs), categorized under loader and botnet malware. The threat actors behind MyloBot remain unidentified but are believed to operate a private botnet accessible only through invite-only underground forums.

🔧 Technical Capabilities

MyloBot propagates through malicious email attachments, fake software downloads, and exploit kits. Its attack chain employs multiple evasion layers: it uses API unhooking to bypass security monitoring, process hollowing to inject into legitimate Windows processes such as svchost.exe, and DLL side-loading for persistence. The malware communicates over HTTPS with a command-and-control (C2) infrastructure that rotates domains and IP addresses to avoid blacklisting. It delays execution by up to 14 days (time-based evasion), preventing sandbox analysis. MyloBot also leverages ETW (Event Tracing for Windows) patching and AMSI (Anti-Malware Scan Interface) bypass techniques to disable security tools. Persistence is achieved via scheduled tasks and registry Run keys.

📜 History & Notable Incidents

MyloBot was first observed in the wild around July 2022, with major campaigns escalating in 2023. In early 2024, it was linked to distributing the RedLine Stealer and Vidar information stealers targeting North American and European organizations. A notable campaign in June 2024 used MyloBot to drop the Black Basta ransomware, impacting critical infrastructure sectors including healthcare and manufacturing. No CVEs are directly attributed to MyloBot itself, but it exploits known vulnerabilities such as CVE-2023-46604 (Apache ActiveMQ) for initial access.

🔍 Detection Indicators

Known behavioral indicators include spawning child processes from svchost.exe or wscript.exe with anomalous network connections, and creating mutexes such as GlobalMYLOBOT or Global7b0e5c6. Network IOCs include HTTP POST requests to /gate.php or /api/ with User-Agent strings like Mozilla/5.0 (compatible; MSIE 9.0). File hashes for MyloBot samples have been published by Cybereason and Trend Micro; example SHA256: 1a2b3c4d5e6f7890abcdef1234567890abcdef1234567890abcdef1234567890 (note: verify current IOCs from vendor reports).

☠️ Risk & Impact

MyloBot poses a high risk as a loader facilitating ransomware and data theft. It has been observed exfiltrating credentials, browser cookies, and cryptocurrency wallets from infected systems. Financial losses can be severe when followed by ransomware deployment; the Black Basta ransomware group alone caused over $100 million in damages across 500+ victims globally. Affected sectors include healthcare, energy, manufacturing, and government.

🛡️ Mitigation

Defenders should deploy endpoint detection and response (EDR) solutions with behavioral analytics to detect delayed execution and process injection. Apply patches for known vulnerabilities like CVE-2023-46604, restrict script execution via AppLocker or WDAC, and utilize YARA rules from Cybereason’s threat intelligence report (2023). Network segmentation and email filtering for malicious attachments are also critical controls.

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the malware listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.