Malicious Code Passed to PowerShell via the Clipboard

Published: 2022-06-25
Last Updated: 2022-06-25 09:50:40 UTC
by Xavier Mertens (Version: 1)
3 comment(s)

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

3 comment(s)

Comments

cwqwqwq
eweew<a href="https://www.seocheckin.com/edu-sites-list/">mashood</a>
WQwqwqwq[url=https://www.seocheckin.com/edu-sites-list/]mashood[/url]
dwqqqwqwq mashood
[https://isc.sans.edu/diary.html](https://isc.sans.edu/diary.html)
[https://isc.sans.edu/diary.html | https://isc.sans.edu/diary.html]
What's this all about ..?
password reveal .
<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure:

<a hreaf="https://technolytical.com/">the social network</a> is described as follows because they respect your privacy and keep your data secure. The social networks are not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go.

<a hreaf="https://technolytical.com/">the social network</a> is not interested in collecting data about you. They don't care about what you're doing, or what you like. They don't want to know who you talk to, or where you go. The social networks only collect the minimum amount of information required for the service that they provide. Your personal information is kept private, and is never shared with other companies without your permission
https://thehomestore.com.pk/

Diary Archives