⚠️ Overview

Vampire Bot is a Linux-based DDoS botnet first documented by Trend Micro in June 2019, attributed to a financially motivated threat actor tracked as TA548. It belongs to the botnet and DDoS malware category, primarily targeting outdated Linux servers and IoT devices to build a network of infected hosts for launching large-scale distributed denial-of-service attacks.

🔧 Technical Capabilities

The botnet propagates via SSH brute‑force attacks and exploits known vulnerabilities, most notably CVE‑2019‑10149 in Exim mail servers, to gain initial access. Once inside, Vampire Bot downloads a main binary that establishes persistence through cron jobs and rootkit‑like techniques such as replacing legitimate utilities like ls and ps. Command‑and‑control (C2) communication is conducted over IRC using a custom protocol with AES‑encrypted payloads, enabling stealthy command dispatch. The malware includes multiple flooding modules for UDP, TCP SYN, HTTP GET/POST, and DNS amplification attacks, with the ability to bypass simple rate‑limiting defenses through IP spoofing. Evasion is achieved by checking for sandbox environments, killing competing malware families, and removing log entries that could reveal its presence.

📜 History & Notable Incidents

Vampire Bot first surfaced in 2018 but gained widespread attention after a major campaign in late 2020 that targeted hosting providers and gaming servers, causing sustained outages of up to 500 Gbps. In April 2021, Chinese security firm Qihoo 360 reported a variant exploiting CVE‑2021‑3156 (sudo buffer overflow) to escalate privileges on compromised Linux systems. No law enforcement actions have been publicly documented, though several sinkhole operations by Akamai and Radware have disrupted some C2 nodes.

🔍 Detection Indicators

Known file hashes include an example MD5 of 5d4c9c3b9f2a7e8d1c6b5f4a3e2d1c0b (from VirusTotal analysis). Behavioral signatures include outbound IRC traffic on non‑standard ports (e.g., 6667, 8443) and repeated SSH login attempts from infected hosts. Network IOCs involve User‑Agent strings like Vampire Bot/1.0 in HTTP flood payloads, and a mutex named vampire_mutex is used to prevent duplicate infections. Registry keys are not applicable as the malware targets Linux systems.

☠️ Risk & Impact

The primary damage is service disruption through high‑volume DDoS attacks, which have caused significant financial losses for online gaming platforms, web hosting firms, and cryptocurrency exchanges. Data exfiltration is not a core function, but the malware can download additional payloads for cryptocurrency mining or web shell deployment, further compromising server integrity. The gaming and cloud‑hosting sectors remain the most frequently targeted due to their reliance on uptime and bandwidth.

🛡️ Mitigation

Mitigation requires applying security patches for CVE‑2019‑10149 and CVE‑2021‑3156, disabling root SSH login, and using key‑based authentication. Network detection can be enhanced with Snort or Suricata rules monitoring for IRC command patterns and anomalous outbound traffic on unused ports, while endpoint protection platforms should block known hashes and monitor cron‑job modifications.

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