⚠️ Overview

HelloBot is a DDoS botnet first documented by Arbor Networks (now NETSCOUT) in a 2016 security advisory as a family of malware designed to conduct HTTP GET flood attacks against web servers. It belongs to the botnet category, specifically targeting Linux-based systems and IoT devices through brute-force SSH and Telnet attacks. The malware’s operators remain unidentified, but its code shares structural similarities with the BASHLITE and Mirai families, suggesting reuse of public source code.

🔧 Technical Capabilities

HelloBot propagates by scanning random IP ranges on ports 22 (SSH) and 23 (Telnet), then attempting authentication using a hardcoded list of default credentials. Once a device is compromised, it downloads a payload from a remote URL and establishes communication with a command-and-control (C2) server via IRC or HTTP. The botnet supports multiple attack vectors, including HTTP GET floods, TCP SYN floods, and UDP amplification attacks. Persistence is achieved by writing a start-up script to /etc/init.d or modifying cron jobs. Evasion techniques include process hiding via LD_PRELOAD hooks and disabling competing malware by killing processes on common ports. The C2 infrastructure uses domain generation algorithms (DGAs) to rotate domains and avoid takedowns.

📜 History & Notable Incidents

HelloBot was first observed in early 2015 targeting consumer routers and IP cameras, with a major campaign in 2016 that disrupted several small web hosting providers in Europe. No high-profile victim has been publicly named, and no CVEs are directly associated with the malware itself—it relies entirely on weak credentials rather than software exploits. Law enforcement actions have been limited; however, a sinkhole operation in 2017 by the Shadowserver Foundation redirected traffic from over 10,000 infected devices.

🔍 Detection Indicators

Network IOCs include outbound connections to IP addresses in the 185.xxx.xxx.xxx range (often associated with bulletproof hosting) and HTTP traffic containing the User-Agent string HelloBot/1.0. Behavioral signatures include repeated failed SSH/Telnet login attempts followed by a sudden download of a binary from a non-standard port. File hashes are not publicly cataloged in major threat intel feeds, but the payload binary is typically named .x86 or arm and resides in /tmp.

☠️ Risk & Impact

HelloBot primarily causes service disruption through volumetric DDoS attacks, leading to downtime for targeted websites and online services. Affected sectors include small-to-medium web hosting providers, online gaming platforms, and educational institutions. Financial losses are difficult to quantify due to the botnet’s focus on availability rather than data theft. No evidence of data exfiltration has been reported in public sources.

🛡️ Mitigation

Recommended defenses include disabling unnecessary remote management services (SSH/Telnet), enforcing strong password policies, and implementing network-level rate limiting for HTTP requests. Organizations should deploy IPS/IDS signatures for the User-Agent string HelloBot/1.0 and monitor for outbound traffic to known DGA domains. The MITRE ATT&CK technique T1190 (Exploit Public-Facing Application) is relevant, though HelloBot primarily uses T1078 (Valid Accounts) for initial access.

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