Malicious Code Passed to PowerShell via the Clipboard
Another day, another malicious script was found! Today, the script is a Windows bat file that executes malicious PowerShell code but the way it works is interesting. The script has a VT score of 16/54 ( )[1]. The script uses the Windows command-line tool "clip.exe" which is often unknown to people:
This tool helps to save the STDIN content in the clipboard. I checked the LOLBAS[2] project page and did not find "clip.exe".
How does it work?
cmd / c echo "[Redacted_malicious_payload]" | clip.exe && powershell.exe "<code>"
The malicious code is saved into the clipboard and PowerShell fetches it by executing <code>. It contains:
[System.Windows.Clipboard]::GetText.invoke()
The code is executed and the clipboard is cleared:
[System.Windows.Clipboard]::SetText.invoke()
It's a nice technique to implement fileless malware!
Note: The malware family is Boxter[3].
[1] https://www.virustotal.com/gui/file/294de23e4f510838c370ffff2b297fbd38f7da5171988dca091569389b262d6a/content
[2] https://lolbas-project.github.io
[3] https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/trojan.ps1.boxter.a
Xavier Mertens (@xme)
Xameco
Senior ISC Handler - Freelance Cyber Security Consultant
PGP Key
Comments
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Dec 3rd 2022
10 months ago
Anonymous
Dec 3rd 2022
10 months ago
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Dec 26th 2022
9 months ago
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Dec 26th 2022
9 months ago
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Dec 26th 2022
9 months ago
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Dec 26th 2022
9 months ago
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Dec 26th 2022
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Dec 26th 2022
9 months ago
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Dec 26th 2022
9 months ago
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Jan 2nd 2023
9 months ago