Proofpoint has observed an increase in a technique leveraging unique social engineering that directs users to copy and paste malicious PowerShell scripts to infect their computers with malware.
Threat actors including initial access broker TA571 and at least one fake update activity set are using this method to deliver malware including DarkGate, Matanbuchus, NetSupport, and various information stealers. Whether the initial campaign begins via malspam or delivered via web browser injects, the technique is similar. Users are shown a popup textbox that suggests an error occurred when trying to open the document or webpage, and instructions are provided to copy and paste a malicious script into the PowerShell terminal, or the Windows Run dialog box to eventually run the script via PowerShell.
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Source: Proofpoint
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