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Malware Prevalence - August 2012

HitmanPro is a second opinion malware scanner, designed to run alongside existing real-time antivirus programs. Its purpose is to find and remove malware that your existing antivirus program is currently unable to find and/or remove.

The list below is the top malware that HitmanPro found and removed from computers that were protected by up-to-date antivirus programs. It differs from other security companies because this list is about malware that is successful in hiding from or bypassing up-to-date virus protection programs. We are able to compile this list because HitmanPro also records if there was a trusted up-to-date antivirus program on the computer, registered in the Windows Security Center.

Prevalence Top 25

# Malware Prevalence
1 FakeAV 13.67%
2 ZeroAccess 9.38%
3 Alureon 7.49%
4 Mywebsearch 5.72%
5 InstallCore 5.28%
6 Zeus/Citadel (Zbot) 5.06%
7 sst 4.69%
8 Gamevance 3.98%
9 DDoS 3.40%
10 Small 2.78%
11 Hotbar 2.59%
12 Sasfis 2.33%
13 Ransom 2.27%
14 Delf 1.98%
15 MSILInjector 1.97%
16 Virut 1.78%
17 Wimad 1.77%
18 Medfos 1.55%
19 Vundo 1.37%
20 Softomate 1.30%
21 Zusy 1.30%
22 Karagany 1.26%
23 Sality 1.23%
24 OneStep 1.11%
25 Symmi 1.07%
Note: items in bold are new entries

Infected Bootkit Prevalence Top 5

# Bootkit Prevalence
1 sst 65.58%
2 Alureon 16.57%
3 Pihar 7.43%
4 Mebroot 3.95%
5 Shetwirl 1.12%

A bootkit is a variant of a kernel-mode rootkit and modifies the master boot record (MBR) or volume boot record (VBR). They sucessfully subvert 64-bit kernel-mode driver signing in Windows 7.
More information on Wikipedia: Bootkits


Prevalence is the occurrence percentage of a malware family relative to other malware families found on computers protected by an up-to-date antivirus program. For example, of all these infected computers (100%) in August 2012, 4.69% was found infected with the 'sst' malware.


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