New PowerShell Backdoor Poses as Part of Windows Update Process
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New PowerShell Backdoor Poses as A part of Home windows Replace Course of
By Ionut Arghire on October 19, 2022
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Cybersecurity agency SafeBreach has issued a warning a few new PowerShell backdoor that disguises itself as a part of the Home windows replace course of to stay totally undetected.
Operated by a classy, unknown menace actor, the backdoor is distributed by way of a malicious Phrase doc that seems linked to a LinkedIn-based job software spear-phishing lure.
When the doc is opened, macro code inside it drops a PowerShell script on the sufferer’s machine, creates a scheduled activity claiming to be a part of a Home windows replace, after which executes the script from a pretend replace folder.
The script was designed to execute one other PowerShell script however, earlier than the scheduled activity is executed, two different scripts are dropped on the system.
“The content material of the PowerShell scripts is saved in textual content containers contained in the Phrase doc and will probably be saved to the identical pretend replace listing,” SafeBreach mentioned in a word documenting the menace.
Whereas analyzing the 2 scripts, the corporate’s researchers found that some coding errors may permit them to find out the potential variety of victims: one of many scripts was seemingly put in on greater than 70 programs, whereas the opposite seemingly had over 50 installations.
SafeBreach says that the attackers used the scripts to execute particular instructions for data gathering, native person enumeration, file itemizing, file deletion, and Lively Listing person enumeration.
SafeBreach has printed indicators of compromise (IoCs) related to this PowerShell backdoor and warns that it’s totally undetectable.
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