Submission Summary:

What's been foundSeverity Level
Capability to block security-related software by modifying firewall settings and by disabling security services, such as Windows Update, Norton Autoprotect, Kaspersky Anti-Virus, etc.
Produces outbound traffic.
Creates a startup registry entry.
There were some system executable files modified, which might indicate the presence of a PE-file infector.
Contains characteristics of an identified security risk.

 

Technical Details:

 

Possible Security Risk

Threat CategoryDescription
A virus capable to modify other files by infecting, prepending, or overwriting them them with its own body

 

File System Modifications

#Filename(s)File SizeFile HashAlias
1 %Windir%\svchobst.exe
[file and pathname of the sample #1]
135,680 bytes MD5: 0x74F20B877B8827B604C5E892DAE62219
SHA-1: 0x8DEB8000549B7F51E11C7D29F24AA4AB5B0080C2
W32.Ramnit!inf [Symantec]
Virus.Win32.Nimnul.a [Kaspersky Lab]
W32/Ramnit.a [McAfee]
W32/Patched-I [Sophos]
Virus:Win32/Ramnit.A [Microsoft]
Virus.Win32.Ramnit [Ikarus]
Win32/Ramnit.B [AhnLab]
2 %Windir%\svchobstSrv.exe
[part of the sample filename]1Srv.exe
86,528 bytes MD5: 0xAD956C5407D36B77B4365DAAACA2074D
SHA-1: 0x9D9FA74C2C4FF298592FB85B28F9E7C72CF764A7
W32.Virut.CF [Symantec]
Packed.Win32.Krap.hm [Kaspersky Lab]
PWS-Zbot.gen.pq [McAfee]
W32/Scribble-B [Sophos]
Virus:Win32/Virut.BN [Microsoft]
Gen.Trojan.Heur [Ikarus]

 

Memory Modifications

Process NameProcess FilenameMain Module Size
svchobst.exe%Windir%\svchobst.exe204,800 bytes
svchobstSrv.exe%Windir%\svchobstSrv.exe77,824 bytes
[filename of the sample #1][file and pathname of the sample #1]204,800 bytes

 

Registry Modifications

 

Other details

China
Russian Federation

PortProtocolProcess
1035TCPsvchobst.exe (%Windir%\svchobst.exe)
1046TCPsvchobst.exe (%Windir%\svchobst.exe)

Remote HostPort Number
103.80.27.13815266
wopafo.com443
193.111.136.10880

 

Outbound traffic (potentially malicious)

 

 

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