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Home > NetDefend Live > NetDefend IPS Service NetDefend IPS Service Print Advisory ID 2007 Name Cyn Backdoor IPS Signature Maintenance IPS Signature IPS Group FROM / EXT / EXPLOIT Issued Apr 01, 2001 Description Cyn, also known as Backdoor.Antilam.g1, Backdoor.Cyn.101, Backdoor.Cyn.102, Backdoor.Cyn.103, Backdoor.Cyn.12.a, Backdoor.Cyn.121 and Backdoor.Cyn.20, and Cyn_Trojan, is a backdoor Trojan written in Visual Basic. The server attempts to open a port, typically UDP ports 1183; UDP/TCP ports 11225 and 113; and TCP ports 15432, 22115, and 51234. Behaviour: once executed the server does not run in stealth and can clearly be seen by hitting ctrl alt del Affected Application Microsoft Corporation: Windows Any version Solution Removal Cyn Trojan 1.01: Hit ctrl-alt-del, choose c_server, and then click on end task. Now delete C_Server.exe 64.0 KB (65,599 bytes) Removal Cyn Trojan 1.03b: open up regedit (click start, go to run and type regedit) now follow this path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run Look for the "System32" value, right click on it and choose delete Reboot then delete C_server.exe 19.5 KB (19,968 bytes), this could be located anywhere on the infected machine. Refferences http://www.justkiwi.com/tairua/antitrojan/trojans/Cyn%20Trojan%201.01.htm http://www.justkiwi.com/tairua/antitrojan/trojans/Cyn%20Trojan%201.03b.htm http://www.justkiwi.com/tairua/antitrojan/trojans/Cyn_Trojan1.01.htm http://xforce.iss.net/xforce/xfdb/15996 http://www3.ca.com/securityadvisor/pest/pest.aspx?id=453075567 http://www.simovits.com/trojans/tr_data/y769.html

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