silversurfer

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Aug 17, 2014
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Attackers are using ads for fake Microsoft Teams updates to deploy backdoors, which use Cobalt Strike to infect companies’ networks with malware.

Microsoft is warning its customers about the so-called “FakeUpdates” campaigns in a non-public security advisory, according to a report in Bleeping Computer. The campaign is targeting various types of companies, with recent targets in the K-12 education sector, where organizations are currently dependent on using apps like Teams for videoconferencing due to COVID-19 estrictions.

In the advisory, Microsoft said it’s seen attackers in the latest FakeUpdates campaign using search-engine ads to push top results for Teams software to a domain that they control and use for nefarious activity, according to the report. If victims click on the link, it downloads a payload that executes a PowerShell script, which loads malicious content.

Cobalt Strike beacons are among the payloads also being distributed by the campaign, which give threat actors the capability to move laterally across a network beyond the initial system of infection, according to the report. The link also installs a valid copy of Microsoft Teams on the system to appear legitimate and avoid alerting victims to the attack.
 
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