We're gradually updating threat actor names in our reports to align with the new weather-themed taxonomy. Learn about Microsoft threat actor names
Worm:Win32/Narilam.A
Aliases: Trojan.Win32.Delfsnif (Ikarus) Trojan.Win32.Scar (Ikarus) WORM_NARILAM.A (Trend Micro) Trojan.Spy.Narilam!43D3 (Rising AV) Trojan/Win32.Scar (AhnLab) W32.Narilam (Symantec)
Summary
Worm:Win32/Narilam.A is a worm that spreads via removable drives and shared folders on the network. The worm attempts to modify or delete information in certain SQL databases.
To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:
- Microsoft Security Essentials or, for Windows 8, Windows Defender
- Microsoft Safety Scanner
Additional remediation steps for Worm:Win32/Narilam.A
Worm:Win32/Narilam.A may make lasting changes to SQL databases that will not be restored by detecting and removing this threat. To return an infected computer to its pre-infected state, files modified or deleted by Worm:Win32/Narilam.A must be restored from backup.
Recovering from recurring infections on a network
The following additional steps may need to be taken to completely remove this threat from an infected network, and to stop infections from recurring from this and other similar types of network-spreading malware:
- Ensure that an antivirus product is installed on ALL computers connected to the network that can access or host shares.
- Ensure that all available network shares are scanned with an up-to-date antivirus product.
- Restrict permissions as appropriate for network shares on your network. For more information on simple access control, please see: http://technet.microsoft.com/library/bb456977.aspx.
- Remove any unnecessary network shares or mapped drives.
Note: Additionally it may be necessary to temporarily change the permission on network shares to read-only until the disinfection process is complete.
