Online Scanner Top Twenty for June 2008

Position	Change in position	Name	Percentage
1.	+5	Email-Worm.Win32.Brontok.q	1.50
2.	+4	not-a-virus:PSWTool.Win32.RAS.a	1.31
3.	New!	Trojan.Mac.Dnscha.d	1.14
4.	-2	Virus.Win32.Virut.n	1.13
5.	New!	not-a-virus:Monitor.Win32.ActMon.511	0.88
6.	New!	Trojan.Mac.Dnscha.e	0.76
7.	+3	Virus.Win32.Virut.q	0.66
8.	+7	Worm.Win32.AutoIt.i	0.61
9.	New!	Trojan.SymbOS.Skuller.gen	0.58
10.	Return	not-a-virus:RiskTool.Win32.HideWindows	0.57
11.	New!	Email-Worm.Win32.Runouce.b	0.57
12.	-1	Worm.Win32.Mabezat.b	0.57
13.	New!	Trojan-PSW.Win32.LdPinch.fbq	0.54
14.	-5	Trojan.Win32.Delf.aam	0.53
15.	+1	not-a-virus:PSWTool.Win32.PWDump.2	0.49
16.	Return	not-a-virus:Monitor.Win32.Perflogger.ca	0.49
17.	-3	Trojan-Downloader.Win32.AutoIt.aa	0.49
18.	+2	Virus.Win32.Alman.b	0.47
19.	New!	Trojan-Downloader.Win32.Delf.cxa	0.47
20.	-12	not-a-virus:AdWare.Win32.Agent.zk	0.45
Other Malicious Programs			85.81

The Online Scanner Top 20 never ceases to amaze – this month a total of 3(!) malicious programs for non-Windows platforms appeared out of nowhere. Does this mean that other platforms are becoming so popular among virus writers that the usual leading platform, Win32, is now being challenged? Specifically, the new entries of note this month were Trojan.Mac.Dnscha.d, Trojan.Mac.Dnscha.e, Trojan.SymbOS.Skuller.gen.

Trojan.SymbOS.Skuller, one of the oldest Trojans for Symbian OS, replaces all file icons with a skull. Its appearance in the Top Twenty is completely unexpected, as is that of the Trojan.Mac.Dnscha family, which is a shell script for Macs that modifies DNS system settings.

Utilities that aren’t actually malicious, but which are used by other malware to obtain confidential user information or interfere with the smooth functioning of the victim machine are still common among the programs detected by our online scanner. Such programs are classified as not-a-virus.

The Top Twenty veterans Email-Worm.Win32.Brontok, Virus.Win32.Virut, and Virus.Win32.Alman are all still present in the rankings, and showing no signs of fading from the scene.

Summary

• New: Trojan.Mac.Dnscha.d, not-a-virus:Monitor.Win32.ActMon.511, Trojan.Mac.Dnscha.e, Trojan.SymbOS.Skuller.gen, Email-Worm.Win32.Runouce.b, Trojan-PSW.Win32.LdPinch.fbq, Trojan-Downloader.Win32.Delf.cxa.
• Moved up: Email-Worm.Win32.Brontok.q, not-a-virus:PSWTool.Win32.RAS.a, Virus.Win32.Virut.q, Worm.Win32.AutoIt.i, not-a-virus:PSWTool.Win32.PWDump.2, Virus.Win32.Alman.b.
• Moved down: Virus.Win32.Virut.n, Worm.Win32.Mabezat.b, Trojan.Win32.Delf.aam, Trojan-Downloader.Win32.AutoIt.aa, not-a-virus:AdWare.Win32.Agent.zk.
• Returned: not-a-virus:RiskTool.Win32.HideWindows, not-a-virus:Monitor.Win32.Perflogger.ca