When I have the PE type selected for Wildfire are ZIP files sent to be scanned if they contain EXE files? I thought they were, but figured I would ask.
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Yes you are right. Exe files contained in zip files can be forwarded to Wildfire and scanned.
Proof (shows pck2302.zip containing 25 exe files ):
As far as PE file types are concerned, currently we support the following extensions -- exe, dll, com, scr, ocx, cpl, sys, drv, tlb
Hope that is the information you were looking for.
Thanks and regards,
Just so I am clear... The only file type I have enabled right now is PE. Do I need to enable ZIP or is this handled automatically (and then PE types in the zip are scanned).
Kadak has shared some good knowledge. To add a point, In identifying the PE files with in ZIP files we go 3 iterations down in zip files to see if there is a PE file. So in general they should be extracted and caught by the cloud for PE malware analysis.
Got a WF/Zip question.
How does a FW with WF handle multiple levels of zip encoding? Is there an upper limit of "levels" a file has been zipped?
On a related note any reason why the WF Portal can't accept a zip file?
There may be several reasons zip files are not accepted, possibly to prevent needing to unpack many non-scannable files
@reaper So if I'm understanding correctly a file which has been "zipped" 3 times with the actual file being a .exe could be analyzed for "maliciousness." If there was a 4th level of zip encoding of maybe some other .docx attached to a .pptx would be beyond the 4 layers of encoding and as such would only be seen as "multi-level encoding" from a WF perspective on the firewall?
yes, a PE file could be in 4 zips deep if sent over a plain connection, but a docx only 3 because the docx itself is encoded, the transport layer itself also counts so if it's sent over http chunk encoding you could only go 3 deep for the PE or 2 for the docx
once the number of levels is exceeded, the file blocking profile (and per extention WildFire) would only see multi-level-encoding and act upon your policy to allow or deny, but no longer forward
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