high
Summary
Summary
Action- More Information
| Affected operating systems | Windows |
|---|---|
| Characteristics |
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| Included in our products from | January 2008 (4.25) |
| Protection available since | 19 November 2007 14:01:27 (GMT) |
| Detected by | All Sophos products |
Action
- Summary
- Action
- More Information
Please follow the instructions for removing Trojans.
More Information
Troj/DwnLdr-GYV is a Trojan for the Windows platform.
Troj/DwnLdr-GYV includes functionality to access the internet and communicate with a remote server via HTTP.
When first run Troj/DwnLdr-GYV copies itself to <System>\ldr.exe and creates the following files:
<System>\drivers\ntosnh.sys
<System>\drivers\ntoss.sys
The file ntosnh.sys is detected as Troj/RKProc-Fam and the file ntoss.sys is detected as Mal/Generic-A.
The following registry entry is changed to run ldr.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Userinit
<System>\userinit.exe,<System>\ldr.exe
The file ntosnh.sys is registered as a new system driver service named "ntosnh.sys", with a display name of "ntosnh.sys". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\ntosnh.sys
The file ntoss.sys is registered as a new system driver service named "ntoss.sys", with a display name of "ntoss.sys". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\ntoss.sys
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