A Trojan written for the series 60 Symbian mobile phone operating system; Troj/Skulls, appeared in the middle of the month. Although it is quite destructive - it disables all applications on infected phones, most vendors gave it a low-risk assessment. Trend Micro initially rated it as medium, but later revised that downwards.
A second variant, Troj/Skulls-B, appeared at the end of the month; it also drops a copy of the virus SymbOS/Cabir.B. However, the virus would have to be started manually before an oubreak over Bluetooth could occur.