This worm adds registry entries to enable its automatic execution at every system startup.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Installation
This worm drops the following copies of itself into the affected system:
- %Application Data%\rljlz.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It injects threads into the following normal process(es):
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Taskman = %Application Data%\rljlz.exe
Propagation
This worm creates the following folders in all removable drives:
It drops the following copy(ies) of itself in all removable drives:
- [DRIVE]:\PISTOLATO\kalibar.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
{garbage codes}
[autorun]
shell\Install\command=PISTOLATO\kalibar.exe
shell\open\command=PISTOLATO\kalibar.exe
shell\explore\command=PISTOLATO\kalibar.exe
Shell\open\command=PISTOLATO\kalibar.exe
useautoplay=1
shellexecute=PISTOLATO\kalibar.exe
open=PISTOLATO\kalibar.exe
action=Open folder to view files
icon=shell32.dll,4
Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
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To restart in Safe Mode:
• For Windows 98 and ME users
- Restart your computer.
- Press the CTRL key until the startup menu appears.
- Choose the Safe Mode option then press Enter.
• For Windows NT (VGA mode) users
- Click Start>Settings>Control Panel.
- Double-click the System icon.
- Click the Startup/Shutdown tab.
- Set the Show List field to 10 seconds and click OK to save this change.
- Shut down and restart your computer.
- Select VGA mode from the startup menu.
• For Windows 2000 users
- Restart your computer.
- Press the F8 key, when you see the Starting Windows bar at the bottom of the screen.
- Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.
• For Windows XP users
- Restart your computer.
- Press F8 after the Power-On Self Test (POST) is done. If the Windows Advanced Options Menu does not appear, try restarting and then pressing F8 several times after the POST screen.
- Choose the Safe Mode option from the Windows Advanced Options Menu then press Enter.
• For Windows Server 2003 users
- Restart your computer.
- Press F8 after Windows starts up. If the Windows Advanced Options Menu does not appear, try restarting again and then pressing F8 several times after restarting.
- On the Windows Advanced Option menu, use the arrow keys to select Safe Mode, and then press Enter.
Step 3
Delete this registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer"s registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- Taskman = %Application Data%\rljlz.exe
To delete the registry value this malware created:
- Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
- In the left panel of the Registry Editor window, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows NT>CurrentVersion>Winlogon - In the right panel, locate and delete the entry:
Taskman = %Application Data%\rljlz.exe - Close Registry Editor.
Step 4
Search and delete this folder
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Please make sure you check the
Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. [DRIVE]:\PISTOLATO
To delete the malware/grayware/spyware folder:
- 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 My Computer, then press Enter.
- Once located, select the folder then press SHIFT+DELETE to permanently delete the folder.
Step 5
Search and delete AUTORUN.INF files created by WORM_RIMECUD.AB that contain these strings
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{garbage codes}
[autorun]
shell\Install\command=PISTOLATO\kalibar.exe
shell\open\command=PISTOLATO\kalibar.exe
shell\explore\command=PISTOLATO\kalibar.exe
Shell\open\command=PISTOLATO\kalibar.exe
useautoplay=1
shellexecute=PISTOLATO\kalibar.exe
open=PISTOLATO\kalibar.exe
action=Open folder to view files
icon=shell32.dll,4
To identify and delete AUTORUN.INF files created:
- Right-click the Start button then choose Search... or Find..., depending on the version of Windows you are running.
- In the Named input box, type:
AUTORUN.INF - In the Look in: drop-down list, select a drive, then press Enter.
- Select the file, then open using Notepad.
- Check if the following lines are present in the file:
{garbage codes}
[autorun]
shell\Install\command=PISTOLATO\kalibar.exe
shell\open\command=PISTOLATO\kalibar.exe
shell\explore\command=PISTOLATO\kalibar.exe
Shell\open\command=PISTOLATO\kalibar.exe
useautoplay=1
shellexecute=PISTOLATO\kalibar.exe
open=PISTOLATO\kalibar.exe
action=Open folder to view files
icon=shell32.dll,4
- If the lines are present, delete the file.
- Repeat steps 3 to 6 for the remaining AUTORUN.INF files in other remaining removable drives.
- Close Search Results.
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_RIMECUD.AB If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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