Singlejump.G (renamed Onehop.G) is Symbian SIS file trojan that replaces system files and many 3rd party applications with corrupted binaries from SymbOS/Doomboot.A and SymbOS/Bootton.A torjans. These components prevent phone from rebooting, so if your phone is infected with Singlejump.G, it is critical not to reboot the phone or click any changed icons. Singlejump.G sends also SymbOS/Doomboot.A to the first device it finds with Bluetooth.
Disinfection with two Series 60 phones
For full disinfection of Singlejump.G you need help of another Series 60 phone that is not infected with the trojan, and clean memory card on that phone.
Download F-Skulls tool from ftp://ftp.f-secure.com/anti-virus/tools/f-skulls.zip or directly with phone http://www.europe.f-secure.com/tools/f-skulls.sis
Disinfection for the cases when phone is already rebooted and cannot start up
CAUTION! This method will remove all data on the device including calendar and phone numbers
Installation to system
When installed Singlejump.G will replace most common third party file managers and application installer with non-functional versions. Some icons are also replaced with application that causes device reboot.
Singlejump.G replaces built in and third party applications with component that causes reboot to fail.
Some application icons are replaced with different icons and point to application that will reboot the phone when executed.
Singlejump.G use modified Cabir to spread other trojans. Instead of sending a copy of itself it loads SIS file installed by Singlejump.G and sends it to the first phone it finds within Bluetooth range. In most cases these trojans doesn’t send themselves further.
F-Secure Mobile Anti-Virus for Symbian detects this malware starting from the update build number 15.
Write-up: Mika Tolvanen
Technical Details: Mika Tolvanen, December 28, 2005
Description Updated: Mika Tolvanen, February 15, 2006