SolarMarker Attack Leverages Weak WordPress Sites, Fake Chrome Browser Updates
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Researchers have discovered the cyberattack group behind the SolarMarker malware targeting a global tax consulting organization with a presence in the US, Canada, the UK, and Europe, which is using fake Chrome browser updates as part of watering hole attacks.
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It is unclear whether the SolarMarker group is testing new tactics or preparing for a wider campaign, given that the TRU team has only observed a single infection of this vector type — previous SolarMarker attacks used SEO poisoning to hit people who searched online for free templates of popular business documents and business forms.
In October 2021, Sophos Labs observed a number of active SolarMarker campaigns that followed a common pattern: using SEO techniques, the cybercriminals managed to place links to websites with Trojanized content in the search results of several search engines.
A previous SolarMarker campaign reported by Menlo Security in October 2021 used more than 2,000 unique search terms, luring users to sites that then dropped malicious PDFs rigged with backdoors.
Monitor Endpoints, Raise Employee Awareness
The TRU advisory outlines four key steps organizations can take to reduce the impact of these kinds of attacks, including raising employee awareness regarding browser updates that occur automatically, and avoiding downloading files from unknown sites.
The victim was an employee of a tax consulting organization and searched for the manufacturer by name on Google.
It's a new approach for the group, replacing its previous method of search engine optimization (SEO) poisoning, also known as spamdexing.
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