WORM_DORKBOT.LY
Worm:Win32/Dorkbot.AR (Microsoft); RDN/Generic.dx!bcd (McAfee); Trojan.Win32.Scar.hmnx (Kaspersky); Worm.Win32.Dorkbot (Sunbelt); Trojan horse Generic32.AOTL (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 on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
118,784 bytes
EXE
Yes
30 Apr 2013
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
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
Yjhvnruikdqvnksz.exe = "%User Profile%\Application Data\Yjhvnruikdqvnksz.exe"
Dropping Routine
This worm drops the following files:
- %User Temp%\rydjtjzyvsieqko.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}e.com/dl/201468511/672e785/374844578.html
- http://{BLOCKED}e.com/{random path}
This report is generated via an automated analysis system.
SOLUTION
9.300
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
- Yjhvnruikdqvnksz.exe = "%User Profile%\Application Data\Yjhvnruikdqvnksz.exe"
Step 4
Search and delete this file
- %User Temp%\rydjtjzyvsieqko.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DORKBOT.LY. 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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