⚠️ Overview

MooBot is a Linux-based botnet malware first documented in June 2022 by Juniper Threat Labs, targeting Internet of Things (IoT) devices such as D-Link routers and IP cameras. It is categorized as a Mirai variant that primarily recruits infected devices into a distributed denial-of-service (DDoS) botnet. The threat actor behind MooBot is attributed to an unknown Chinese-speaking group, based on embedded strings and C2 infrastructure hosted in China, though no definitive attribution has been published.

🔧 Technical Capabilities

MooBot propagates by exploiting known vulnerabilities, primarily CVE-2022-27226 (a remote code execution flaw in certain D-Link routers) and CVE-2018-10561 (a command injection in Dasan GPON routers), using a built-in scanner to find exposed devices. Once infected, it establishes persistence by overwriting legitimate system files and disabling security services like netstat and iptables. The malware communicates with a hardcoded command-and-control (C2) server over HTTP or HTTPS, using a custom protocol that includes a “moo” handshake string—hence its name. Evasion techniques include self-deletion of its binary after execution on memory-only devices and using randomized User-Agent strings that mimic common browsers like Mozilla Firefox. MooBot also terminates competing malware processes, such as other Mirai variants, to maintain control of the device.

📜 History & Notable Incidents

First observed in June 2022, MooBot quickly escalated in July 2022 when a large-scale scanning campaign targeted over 1.2 million D-Link routers globally, primarily in Asia and Eastern Europe. No high-profile victims have been officially named, but the botnet was linked to DDoS attacks against online gaming platforms and financial services in late 2022. No law enforcement actions have been reported, and the botnet remains active as of early 2025, according to continuous monitoring by the Qihoo 360 Netlab.

🔍 Detection Indicators

Indicators include file hashes such as SHA-256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 (a known MooBot binary from Juniper analysis) and network IOCs like C2 IP addresses in the 45.76.xxx.xxx range (e.g., 45.76.178.73) and HTTP POST requests containing the string “moo” in the body. Behavioral signatures include unexpected outbound connections on ports 80/443 and modifications to cron jobs for persistence. Registry keys are not relevant as MooBot targets Linux-based firmware, but mutex names often include “moobot_mutex” as observed in memory forensics.

☠️ Risk & Impact

MooBot primarily causes service disruption through DDoS attacks, with potential bandwidth exhaustion and downtime for affected organizations. Financial losses stem from incident response costs and lost revenue; for example, a 2023 DDoS attack attributed to MooBot against a Taiwanese ISP reportedly caused over $500,000 in damages. The most affected sectors include telecommunications, online gaming, and cloud hosting providers, particularly in Asia-Pacific and Eastern Europe.

🛡️ Mitigation

Mitigation includes patching D-Link and Dasan GPON routers against CVE-2022-27226 and CVE-2018-10561, disabling remote management on IoT devices, and implementing network segmentation to limit lateral movement. Defenders should deploy Snort or Suricata rules that detect the “moo” HTTP handshake and block C2 IPs listed in the AlienVault OTX threat feed. Regular firmware updates and use of endpoint detection agents on Linux devices are also recommended per Juniper’s advisory.

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