Submission Summary:

What's been foundSeverity Level
Produces outbound traffic.
Contains characteristics of an identified security risk.


Technical Details:


Possible Security Risk

Threat CategoryDescription
A keylogger program that can capture all user keystrokes (including confidential details such username, password, credit card number, etc.)
A malicious backdoor trojan that runs in the background and allows remote access to the compromised system


File System Modifications

#Filename(s)File SizeFile HashAlias
1 %System%\nannaa.exe
[file and pathname of the sample #1]
281,088 bytes MD5: 0xDECD4D6D8A115D7075AA3E403B999E35
SHA-1: 0x29229D6EEA5C5A885176F39AD3E93F792FDD1D2C
Backdoor.Nitol [Symantec]
Trojan-Spy.Win32.Agent.btsm [Kaspersky Lab]
DDoS:Win32/Nitol.A [Microsoft]
Trojan.Win32.ServStart [Ikarus]


Memory Modifications

Process NameProcess FilenameMain Module Size
nannaa.exe%System%\nannaa.exe299,008 bytes
[filename of the sample #1][file and pathname of the sample #1]299,008 bytes

Service NameDisplay NameStatusService Filename
NationalmrnNationalcrv Instruments Domain Service"Running"%System%\nannaa.exe


Registry Modifications


Other details

Republic of Korea

1033TCPnannaa.exe (%System%\nannaa.exe)

Remote HostPort Number


Outbound traffic (potentially malicious)



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