ThreatCluster

17 Malicious Chrome Extensions in GhostPoster Campaign Compromise User Data

First seen 19 Jan 2026, 10:01 UTC • •31

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ThreatCluster •March 12, 2026 at 13:27 UTC

Cybercriminals have distributed 17 malicious browser extensions across Chrome, Firefox, and Edge, with over 840,000 installations. The GhostPoster campaign, active since at least 2020, utilized deceptive names to masquerade as legitimate tools while stealing user data. Users of these extensions are at risk of compromised security due to years of unnoticed exploitation.

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Threat Graph

7 entities, 5 inferred relationships (STIX 2.1).

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Technique (1)

Malware

Campaign (1)

GhostPoster Malware Campaign

Malware (1)

GhostPoster

Affected Platform (3)

Edge
Firefox
Microsoft Edge

Tool (1)

Chrome

Relationships

GhostPoster Malware Campaign uses GhostPoster
Malware targets Edge
Malware targets Firefox
Malware targets Microsoft Edge
GhostPoster Malware Campaign related to Chrome

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