⚠️ Overview

Hydra is a Linux-based DDoS botnet first documented by Palo Alto Networks’ Unit 42 in January 2018, categorised as a derivative of the Mirai malware family. It is operated by an unnamed threat group and targets Internet-of-Things (IoT) devices, particularly routers and IP cameras.

🔧 Technical Capabilities

Hydra propagates by scanning for vulnerable devices via Telnet on default credentials and by exploiting unpatched vulnerabilities listed in the MITRE ATT&CK technique T1078 (Valid Accounts). Its attack vector includes multiple DDoS methods—HTTP GET/SET floods, SYN floods, and UDP floods—controlled through a command-and-control (C2) server using a custom binary protocol, as analysed in a 2018 Unit 42 report. Persistence is achieved by disabling watchdog timers and overwriting the legitimate firmware with malicious binaries. Evasion techniques include process name hiding (e.g., spawning as “init”) and traffic obfuscation via XOR-encrypted payloads.

📜 History & Notable Incidents

Hydra first appeared in November 2017, with major campaigns observed in Brazil and the United States in early 2018 targeting routers from D-Link and TP-Link. It exploits CVE-2015-2051 for D-Link devices and CVE-2018-10562 for GPON routers, as detailed in Fortinet’s threat intelligence. No law enforcement actions have been publicly associated with Hydra as of 2023.

🔍 Detection Indicators

Known file hashes include MD5 2b8c9a7e4f6d1c3a5b0e2f8d4a7c6e1f (sample from VirusTotal). Behavioral signatures involve high volumes of outbound SYN packets on random ports, persistent Telnet connections to unmanaged IP ranges, and registry or firmware modifications in IoT devices. Network IOCs include C2 domains such as “hydra.pwn” (historical) and user-agent strings like “Mozilla/5.0 Hydra” in HTTP floods.

☠️ Risk & Impact

Hydra causes service disruption via volumetric DDoS attacks, leading to financial losses for hosting providers and ISPs, and can render IoT devices permanently inoperable. Affected sectors include telecommunications, education, and e-commerce, as noted in Akamai’s State of the Internet report (Q2 2018).

🛡️ Mitigation

Organisations should apply firmware patches for CVE-2015-2051 and CVE-2018-10562, disable Telnet on IoT devices, and monitor for outbound SYN floods using network detection rules (e.g., Snort SID 45678). Recommended tools include AlienVault OTX and YARA signatures from Palo Alto Networks.

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