140. Hunting for Masqueraded Malicious Files: Adwind

Hello everyone!

Adversaries always try to masquerade malicious files to look like absolutely legitimate. Today we'll look at Adwind campaign, which was reported by CERT-AGID.

So, the malicious JAR file was disguised to look like an image:

"C:\Users\Public\InvoiceXpress\bin\java.exe" -jar -noverify "C:\Users\Public\InvoiceXpress\bin\InvoiceXpress.png"

It makes malicious file look like legitimate, but at the same time provides us detection opportunities! For example:

event_type: "processcreatewin"

AND

proc_file_name: "java.exe"

AND

cmdline: "png"

Of course, you can experiment with file extensions, as well as executables, for example, you can hunt for rundll32.exe and regsvr32.exe.

See you tomorrow!

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