Solving the 7777 Botnet enigma: A cybersecurity quest

This Sekoia.io investigation dissects the Quad7/7777 botnet that compromises mostly TP‑Link routers (thousands of IPs) to install a socks5 proxy and an xlogin bind shell, which are then used to perform slow, distributed password‑spraying against Microsoft 365 accounts. The report documents live forensic capture from an infected Archer C7, recovered binaries and hashes, network telemetry linking proxy usage to Microsoft login attempts, IOCs, YARA and Sigma detection rules, hypotheses on exploitation chains and attribution, and defensive/detection guidance for MSSPs and defenders.