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LOWKEY.PASSIVE is a backdoor used by APT41 (noted in activity labeled C0017). In the referenced activity, APT41 configured LOWKEY.PASSIVE command-and-control (C2) URL endpoints to masquerade as normal web application traffic on infected servers, indicating an emphasis on blending malicious communications into expected HTTP/web patterns for evasion. No additional capabilities (e.g., specific command set, persistence mechanisms, lateral movement features), delivery/infection vector for the backdoor itself, targeted industries, or concrete indicators of compromise (domains, hashes, filenames) are directly provided in the content beyond the described C2 masquerading behavior and its association with APT41.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A stealthy passive backdoor whose URL endpoints are configured to blend in with normal web application traffic.
Stealthy passive backdoor whose C2 endpoints can be configured to masquerade as normal web application traffic.
Stealthy passive backdoor that can masquerade C2 URL endpoints as normal web application traffic.
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.