075. Detecting RMMs from Ransomware Affiliate's Toolkit: ConnectWise

Hello everyone! I want to continue sharing information on RMMs abused by various ransomware affiliates and other threat actors. And look at detection opportunities, of course! Today we'll look at another popular RAT - ConnectWise.

If you want a fresh example of ConnectWise abuse - here you go. So, let's look at this report from detection perspective. First of all, the malicious file runs msiexec.exe to install ConnectWise:

msiexec.exe" /i "C:\Users\<USER>\AppData\Local\Temp\ScreenConnect\24.3.7.9067\797046ee258ccec1\ScreenConnect.ClientSetup.msi"

Let's search for msiexec.exe executions with "ScreenConnect" in the target path:

event_type: "processcreatewin"

AND

proc_file_name: "msiexec.exe"

AND

cmdline: "ScreenConnect"

So, the adversary uses a legitimate ConnectWise client, so we can also hunt for it as well (or detect if you don't use it in your environment):

event_type: "processcreatewin"

AND

proc_file_productname: "ScreenConnect"

If you want, you can use other parts of metadata to build detection, for example, file's original name.

See you tomorrow!

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