WORM_DORKBOT.VR
Worm:Win32/Dorkbot.I (Microsoft); PWSZbot-FIV!50A159543A3A (McAfee); Trojan.Gen.2 (Symantec); Worm.Win32.Ngrbot.vai (Kaspersky); Trojan.Win32.Agent.adgv (v) (Sunbelt); Trojan horse Inject.CGZR (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
164,352 bytes
EXE
Yes
10 Apr 2014
Arrival Details
This worm arrives via removable drives.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system:
- %Application Data%\temp.bin
- %Application Data%\ScreenSaverPro.scr
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {removable drive letter}:\ViewFiles.cmd
- {removable drive letter}:\{random file name}.exe
Other Details
This worm connects to the following possibly malicious URL:
- http://api.{BLOCKED}ia.com.stcus.ru/icon/n.api
- http://{BLOCKED}.{BLOCKED}.169.105/3434.exe
- http://{BLOCKED}.{BLOCKED}.172.15/a33.exe
NOTES:
It connects to the following URL:
- http://api.wipmania.com/
It drops shortcut (.LNK) files using folder/file names found in removable drives: {removable drive letter}:\{folder/'file name and extension'}.lnk if the folder/file exists.
It then hides the original folder/file tricking users to click .LNK files. This .LNK files point out to a dropped copy of itself in the removable drive.
SOLUTION
9.300
10.350.01
18 Oct 2013
10.351.00
19 Oct 2013
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
Delete this registry value
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"
- Screen Saver Pro 3.1 = "%Application Data%\ScreenSaverPro.scr"
Step 4
Search and delete these files
- {removable drive letter}:\{folder/'file name and extension'}.lnk
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.VR. 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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