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Gamshen is a malicious native Microsoft Internet Information Services (IIS) module used by the GhostRedirector threat actor to conduct SEO fraud. It was deployed on compromised Windows servers alongside the Rungan passive C++ backdoor. GhostRedirector compromised at least 65 Windows servers, primarily in Brazil, Thailand, and Vietnam, and used Gamshen to manipulate search-engine results to promote gambling websites. The actor has been active since at least August 2024.
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.
GhostRedirector has developed a malicious native IIS module, Gamshen, that can perform SEO fraud; we believe its purpose is to artificially promote various gambling websites.
2 distinct techniques documented for this family, organized by ATT&CK tactic.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Malicious native IIS module used by GhostRedirector for SEO fraud, selectively modifying responses for Googlebot to promote gambling sites.
Native IIS module used in GhostRedirector compromises; likely for traffic manipulation/redirect behavior (implied by context); no further details in excerpt.
Named tooling/artifact associated with GhostRedirector activity; used as a differentiator from UAT-8099/WEBJACK-style activity.
Malicious IIS module used to facilitate SEO fraud; described as functionally similar to BadIIS in that it conditionally triggers SEO manipulation based on Google-originated requests (Googlebot User-Agent).
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.