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PowerShell/Agent.dy


Go to solution Solved by Marcos,

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Looks like Procmon logging was stopped too early before a detection was triggered; there was no record of Powershell.exe being run the log.

As for Autoruns, you've provided its binaries, not a log created by the Autoruns application.

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Please provide the content of the C:\Users\gb\AppData\Roaming\EciYLzJxA folder. The folder should contain LfxFKWgd.ps1, hFQTJJ.exe (probably clean, renamed wscript.exe) and LfxFKWgd.txt.

Do not delete the folder/files unless I confirm receipt.

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Great "real-world" example of malware renaming Win script executable's to bypass AV HIPS rules and the like.

Time Eset offered PE header name option in the HIPS to prevent a bypass like this.

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16 minutes ago, Marcos said:

I don't think it renames the system executable but rather drops or copies it under a different name.

Yes. I suspect this is the case. But in any effect, internal PE header name would remain the same as the source process.

Eset_wscript.png.878cb19d83f93c8b2368a8862ba699b0.png

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14 minutes ago, Marcos said:

A changed name of a script interpreter cannot fool our products; we perform deep script scanning regardless of the file name of the interpreter.

Hopefully that is the case. But not the issue. The issue is I want to block/monitor script execution period:

Eset_PE.thumb.png.9e87958484a731094e0c14fbb6f0c518.png

Ref.: https://docs.microsoft.com/en-us/windows/win32/debug/pe-format

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1 hour ago, Nicktopa said:

I have the same problem, same warning PowerShell/Agent.dy message from Eset every 3 minutes.

Would you like the logs as you requested before?

Yes, please provide both Autoruns and logs collected with ESET Log Collector. A Procmon boot log may be needed later as well.

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