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LOOKOVER is a TACACS+ credential-sniffing tool used by the China-nexus threat cluster UNC3886. It passively captures TACACS+ authentication packets to collect administrator credentials. UNC3886 has also replaced the legitimate tac_plus authentication daemon with a backdoored credential-logging version, an activity associated with its use of LOOKOVER. The tool has been deployed in compromises of network infrastructure and associated authentication systems as part of espionage-focused operations.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
Mandiant has previously documented UNC3886 deploying a TACACS+ sniffer called LOOKOVER and replacing the tac_plus daemon with a backdoored version to log credentials.
1 distinct technique documented for this family, organized by ATT&CK tactic.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
TACACS+ credential sniffer previously attributed to UNC3886; mentioned as background comparison to TacTap's credential-collection technique.
A packet sniffer used to capture TACACS+ authentication traffic for credential access.
Sniffer used to capture TACACS+ authentication packets.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.