Note: Please do not mod down or close. Im not a stupid PC user asking to fix my pc problem. I am intrigued and am having a deep technical look at whats going on.
I have come across a Windows XP machine that is sending unwanted p2p traffic.
I have done a 'netstat -b' command and explorer.exe is sending out the traffic. When I kill this process the traffic stops and obviously Windows Explorer dies.
Here is the header of the stream from the Wireshark dump (x.x.x.x) is the machines IP.
GNUTELLA CONNECT/0.6 Listen-IP: x.x.x.x:8059 Remote-IP: 18.104.22.168 User-Agent: LimeWire/5.3.6 X-Requeries: false X-Ultrapeer: True X-Degree: 32 X-Query-Routing: 0.1 X-Ultrapeer-Query-Routing: 0.1 X-Max-TTL: 3 X-Dynamic-Querying: 0.1 X-Locale-Pref: en GGEP: 0.5 Bye-Packet: 0.1 GNUTELLA/0.6 200 OK Pong-Caching: 0.1 X-Ultrapeer-Needed: false Accept-Encoding: deflate X-Requeries: false X-Locale-Pref: en X-Guess: 0.1 X-Max-TTL: 3 Vendor-Message: 0.2 X-Ultrapeer-Query-Routing: 0.1 X-Query-Routing: 0.1 Listen-IP: 22.214.171.124:15649 X-Ext-Probes: 0.1 Remote-IP: x.x.x.x GGEP: 0.5 X-Dynamic-Querying: 0.1 X-Degree: 32 User-Agent: LimeWire/4.18.7 X-Ultrapeer: True X-Try-Ultrapeers: 126.96.36.199:3279,188.8.131.52:3714,184.108.40.206:5807,220.127.116.11:9751,18.104.22.168:15810,22.214.171.124:24295,126.96.36.199:25497,188.8.131.52:32344,184.108.40.206:42254,220.127.116.11:51230 GNUTELLA/0.6 200 OK
So it seems that the malware has hooked into explorer.exe and hidden its self quite well as a Norton Scan doesn't pick anything up.
I have looked in Windows firewall and it shouldn't be letting this traffic through.
I have had a look into the messages explorer.exe is sending in Spy++ and the only related ones I can see are socket connections etc...
My question is what can I do to look into this deeper? What does malware achieve by sending p2p traffic?
I know to fix the problem the easiest way is to reinstall Windows but I want to get to the bottom of it first, just out of interest.
Had a look at Deoendency Walker and Process Explorer.
Both great tools. Here is a image of the TCP connections for explorer.exe in Process Explorer: