Reconstruct executable from tcp-stream

asked 2024-05-10 14:53:04 +0000

I have captured a buch of packets from a connection. I Found a packet of interest and followed the stream. From what i see, it should be an executable MZARUH in the header seems to be a signature for a cobalt strike exploit. My Question: how can i reconstruct this executable, if i only have the TCP-Stream. If you could provide mit with a step by step, this would be great. Or ist there at least a possibility, to proof the theory, that the submittet packets are parts of a malware? Thank you,

Patrick

answered 2024-05-12 14:41:24 +0000

SYN-bit

18528 ●9 ●339 ●255 https://SYN-b.it

There are many ways to transport a file (in your case probably an executable) over TCP. This makes it really hard to provide you with a step by step procedure.

You could do a follow TCP stream and save the content (in RAW format), if it is a clean transfer like when transferred by FTP
You could do an export object if the exe was transferred over SMB/SMB2 or HTTP?
You can carve out the precise data bytes from a stream if you know where the exe starts and ends?

If you are able to share the file, we could perhaps help you better :-)

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