The malware itself has been given the name CooperStealer by the researchers and it is a password and cookie stealer that is in active development which also contains a download feature that allows its operators to deliver additional malicious payloads to infected devices.
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The earliest samples of CooperStealer date back to July of 2019 and during its investigation, Proofpoint analyzed a sample that targets business and advertiser accounts on Facebook and Instagram. However, the firm also identified additional versions of the malware which target Bing, PayPal, Tumblr and Twitter.
During its investigation, Proofpoint noticed that CooperStealer utilizes many of the same targeting and delivery methods as the Chinese-sourced malware family SilentFade which Facebook first reported in 2019 and was responsible for over $4m in damages. For this reason, the firm believes that CooperStealer is a previously undocumented family within the same class of malware as SilentFade, StressPaint, FacebookRobot and Scranos.
CooperStealer itself is distributed on suspicious websites advertised as KeyGen and crack sites such as keygenninja[.]com, piratewares[.]com, startcrack[.]com, and crackheap[.]net. While these sites present themselves as being able to help users circumvent the licensing restrictions of legitimate software, they ultimately provide Potentially Unwanted Programs/Applications (PUP/PUA) or run malicious executables capable of downloading and installing additional payloads.
Proofpoint also worked with researchers at Facebook, Cloudflare and other service provides during its investigation to coordinate disruptive action. For instance, Cloudflare placed a warning interstitial page in front of the malicious domains and created a sinkhole for two of the sites before they could be registered by the threat actor.
A sinkhole is a method used to limit an attacker's ability to collect data on victims while also enabling researchers to gain visibility into victim demographics. During the sinkhole's first 24 hours of operation, it logged 69,992 HTTP requests from 5,046 unique IPs originating from 159 different countries with the top five countries based on unique infections being India, Indonesia, Brazil, Pakistan and The Philippines.
The easiest way to prevent falling victim to the CooperStealer malware is to avoid visiting KeyGen and crack sites to pirate software.
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