Tag: oyster backdoor

1 Attack Reports | 0 Vulnerabilities

Attack reports

Threat Actors Leverage SEO Poisoning and Malicious Ads to Distribute Backdoored Microsoft Teams Installers

A new campaign is distributing the Oyster (Broomstick) backdoor through trojanized Microsoft Teams installers. Threat actors are using SEO poisoning and malvertising to trick users into downloading fake installers from spoofed websites. The malicious installers deploy a persistent backdoor that ena…
malvertising
seo poisoning
persistence
dll sideloading
microsoft teams
c2 communication
oyster
broomstick
2025-10-02
oyster backdoor
trojanized installer
Published: October 2, 2025
Downloadable IOCs: 15
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