high
Summary
Summary
Action- More Information
| Affected operating systems | Windows |
|---|---|
| Characteristics |
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| Included in our products from | February 2005 (3.90) |
| Protection available since | 3 December 2004 10:11:00 (GMT) |
| Detected by | All Sophos products |
Action
- Summary
- Action
- More Information
Please follow the instructions for removing Trojans.
Windows NT/2000/XP/2003
In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. Please read the warning about editing the registry.
At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.
Locate the HKEY_LOCAL_MACHINE entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Print Driver Helper Service
%SYSTEM%\crsrr.exe
and delete it if it exists.
Close the registry editor.
More Information
Troj/Agent-BC is a Trojan proxy which makes itself appear to be a license key generator.
When run using the filename CRSRR.EXE the Trojan immediatelly enters the proxy mode, listenting on TCP/5498 and TCP/25341.
When run using any other filename, Troj/Agent-BC will create MSKEY.EXE in the default temporary folder and execute it, copy itself to the Windows folder as CRSRR.EXE and create the following registry entry so as to auto-run on user logon or computer reboot:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Print Driver Helper Service
%SYSTEM%\crsrr.exe
The Trojan may attempt to download files and publicise the IP address of the infected computer such that the remote attacker may gain access.
The key generator mskey.exe is non-malicious and can be safely deleted.
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