Identifying the Malware Program
To remove this malware, first identify the malware program.
- Scan your computer with your Trend Micro antivirus product.
- NOTE the path and file name of all files detected as BKDR_PROSTI.AA.
Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online virus scanner.
Terminating the Malware Program
This procedure terminates the running malware process. You will need the name(s) of the file(s) detected earlier.
If the process you are looking for is not in the list displayed by Task Manager, proceed to the succeeding solution set.
- Open Windows Task Manager.
• On Windows 98 and ME, press
• On Windows NT, 2000, XP, and Server 2003, press
CTRL%20SHIFT%20ESC, then click the Processes tab.
- In the list of running programs*, locate the malware file(s) detected earlier.
- Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your computer.
- Do the same for all detected malware files in the list of running processes.
- To check if the malware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
On computers running Windows 98 and ME, Windows Task Manager may not
show certain processes. You can use a third party process viewer such as Process Explorer
to terminate the malware process.
On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Task Manager or Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by either Task Manager or Process Explorer, but you are unable to terminate it, restart your computer in safe mode.
Editing the Registry
This malware modifies the computer's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:
- HOW TO: Backup, Edit, and Restore the Registry in Windows 95, Windows 98, and Windows ME
- HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
- HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
- HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003
Removing Autostart Entries from the Registry
Removing autostart entries from the registry prevents the malware from executing at startup.
If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
- In the right panel, locate and delete the following entries:
- DllHost = "C:\WINDOWS\inf\dllhost.exe"
- msn = "C:\WINDOWS\Media\winlogon.exe"
- SondBlaster = "C:\WINDOWS\Media\lsass.exe"
- Yahoo! = "C:\WINDOWS\Media\ethernet.exe"
- Close Registry Editor.
Deleting the Malware Files
- Right-click Start then click Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
- In the Look In drop-down list, select the drive that contains Windows, then press Enter.
- Once located, select the file then press Delete.
- Repeat steps 2-4 for the following file:
Important Windows ME/XP Cleaning Instructions
Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.
Users running other Windows versions can proceed with the succeeding solution set(s).
Running Trend Micro Antivirus
If you are currently running in safe mode, please restart your computer normally before performing the following solution.
Scan your computer with Trend Micro antivirus and delete files detected as BKDR_PROSTI.AA. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.
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