F-Secure Trojan Information Pages : Cardtrap.AE [ Summary ] | [ Disinfection ] | [ Detailed Description ] | [ Detection ] Name: Cardtrap.AE Type: Trojan Category: Trojan Platform: SymbOS Date of Discovery: April 03, 2006 Summary Cardtrap.AE is a Symbian SIS file trojan that disables several of Symbian's built in applications, tries to damage some 3rd party applications, and installs Windows malware to the memory card. Disinfection Disinfection with two Series 60 phones Use F-Skulls to allow for installation of F-Secure Mobile Anti-Virus Install F-Secure Mobile Anti-Virus Download F-Skulls tool from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly to a clean phone from http://www.f-secure.com/tools/f-skulls.sis Install F-Skulls.sis onto the infected phone's memory card with a clean phone Put the memory card with the F-Skulls tool into the infected phone Start up the infected phone and the application installer should now work Go to the application manager and uninstall the SIS file in which you installed the malware Download F-Secure Mobile Anti-Virus from http://phoneav.com and activate the Anti-Virus Scan the phone and remove any remaining components of the malware Remove the F-Skulls tool with the application manager as the phone should now be clean Back to the Top Detailed Description Spreading in “Norman Virus Control.sis”. Installation to the Phone Cardtrap.AE tries to disable key system applications and 3rd party products by installing several damaged files to the phone's memory. Cardtrap.AE installs files from following Symbian malware: SymbOS/Blankfont.A SymbOS/Singlejump.A F-Secure Mobile Anti-Virus is capable of detecting Cardtrap.AE with generic detection, so if the phone has functional Anti-Virus installed, Cardtrap.AE will be blocked before it can be installed. Installation to the MMC Card Cardtrap.AE installs following Windows malware: Backdoor.Win32.Netbus.20.d to the phone's MMC card. Backdoor is installed with a filename, icon, and shortcut link that tries to fool the user into clicking them. Back to the Top Detection F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 44. Back to the Top Write-up: Mika Tolvanen, April 3, 2006 Technical Details: Mika Tolvanen, April 3, 2006 F-Secure Corporation