Malware Miscellany, July 2007
As we gradually start the transition to autumn, let's take a moment to look at the miscellaneous malware we saw at the height of summer 2007.
- Greediest Trojan targeting banks - Summer is already halfway over. During the midsummer month of July, this category was led by Trojan-Spy.Win32.Banker.alv, which currently has its sights set on 33 banks.
- Greediest Trojan targeting payment systems - the title this month goes to Trojan-PSW.Win32Steam.f, currently targeting three different e-payment systems at once.
- Greediest Trojan targeting payment cards – here a Brazilian Trojan, Trojan-Spy.Win32Banbra.df, takes the category, targeting four different payment card systems.
- Stealthiest malicious program - Trojan-Downloader.Win32.Delf.ain, which is packed 12 times, dominated this category in July.
- Smallest malicious program – this month we have a tiny 14-byte program (the same size as last month's winner, incidentally) called Trojan.BAT.Formatcu. Despite its small size, this program is capable of doing a lot of damage by destroying all data on the C: drive.
- Largest malicious program - the heavyweight champion in July, a modification of Trojan.Win32.KillFiles.mb, takes up a lot of space at 743MB.
- Most malicious program - the leader this month is Backdoor.Win32.Aebot.e. It deletes antivirus protection from files on disk, from processes running in RAM, and from registry auto run keys.
- Most common malicious program in email traffic - July’s most common malicious program was Email-Worm.Win32.Warezov.pk, which accounted for nearly 23% of all mail traffic last month.
- Most common Trojan family - last month’s leader in this category was the Trojan-Spy.Win32.Banload family. A total of 534 variants of this family that had not been previously detected emerged last month.
- Most common virus/ worm family - The most common worm family in July was the email worm Warezov. 41 modifications of this family were detected in July.
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