W32/Opaserv.Q
Analysis
- Virus is 32bit, with a size of 23552 bytes
- Virus icon is that of a standard 32bit executable
- Virus attempts to connect to opasoft.com and update
itself however the hard-coded URL is no longer available
- Virus copies itself to the Windows folder as marco!.scr
and modifies the registry to load at Windows startup
–
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\
CurrentVersion\Run
cronos = C:\WINDOWS\macro!.scr -
The virus will attempt to use SMB through NetBIOS seeking machines on the same IP subnet
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The virus will scan IP addresses within the same domain for other shares, using NetBIOS via TCP port 137, seeking systems with open shares. If a system is found with an open share, the virus will copy itself to that machine in the Windows folder as “marco!.scr”
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The virus will modify the WIN.INI configuration file to load the dropped virus at Windows startup