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.
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 %System%\nannaa.exe
[file and pathname of the sample #1]
144,384 bytes MD5: 0xD9B6C3AA66AE81F2058F9132DE51FDC8
SHA-1: 0x674E4755ADDDC3B6AC94A8931329A6A0CF0A94E5
W32.Ramnit!inf [Symantec]
Virus.Win32.Nimnul.a [Kaspersky Lab]
W32/Ramnit.a [McAfee]
W32/Patched-I [Sophos]
Virus:Win32/Ramnit.A [Microsoft]
Backdoor.Win32.Inject [Ikarus]
Win32/Ramnit.B [AhnLab]
2 %System%\nannaaSrv.exe 86,528 bytes MD5: 0xD8AADBF2EE91FCB457141895DBA38148
SHA-1: 0x7FEDEF2AA5287CBEAA0F06D8A0A94D1BA651C378
W32.Virut.CF [Symantec] [Kaspersky Lab]
PWS-Zbot.gen.pq [McAfee]
W32/Scribble-B [Sophos]
Virus:Win32/Virut.BN [Microsoft]
Virus.Win32.Virut [Ikarus]
3 [part of the sample filename]1Srv.exe 86,528 bytes MD5: 0xF0515946A40D64ED4981498AE7D9B4C5
SHA-1: 0xF0B465294CC3122E90CF4CA26DE086A252E919BA
W32.Virut.CF [Symantec] [Kaspersky Lab]
PWS-Zbot.gen.pq [McAfee]
W32/Scribble-B [Sophos]
Virus:Win32/Virut.BN [Microsoft]
Virus.Win32.Virut [Ikarus]


Memory Modifications

Process NameProcess FilenameMain Module Size
nannaa.exe%System%\nannaa.exe163,840 bytes
nannaaSrv.exe%System%\nannaaSrv.exe77,824 bytes
[filename of the sample #1][file and pathname of the sample #1]163,840 bytes

Service NameDisplay NameStatusService Filename
Stuvwx Abcdefgh JklStuvwxya Cdefghijk Mnopqrs Uvwxyabc Efg"Running"%System%\nannaa.exe


Registry Modifications


Other details

Russian Federation

1035TCPnannaa.exe (%System%\nannaa.exe)

Remote HostPort Number


Outbound traffic (potentially malicious)



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