WORM_DOWNAD.EJ
Worm:Win32/Conficker.B (Microsoft), W32/Conficker.worm.gen.a (McAfee), W32.Downadup.B (Symantec)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops copies of itself into network drives. It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
158,003 bytes
DLL
Yes
19 Sep 2012
Arrival Details
This worm arrives by connecting affected removable drives to a system.
It may arrive via network shares.
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:
- %System%\{random number}.tmp
- %Program Files%\Internet Explorer\{random file name}.dll
- %Program Files%\Movie Maker\{random file name}.dll
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Autostart Technique
This worm is a .DLL file that adds the following services:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random service name}
ImagePath = "%System%\{random number}.tmp"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{random service name}
Propagation
This worm creates the following folders in all removable drives:
- Recycler\{SID}
It drops the following copy(ies) of itself in all removable drives:
- Recycler\{SID}\{random characters}.{random}
It drops copies of itself into network drives.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Other Details
This worm connects to the following URL(s) to get the affected system's IP address:
- http://www.whatsmyipaddress.com
- http://www.whatismyip.org
- http://www.getmyip.org
- http://checkip.dyndns.org
It connects to the following possibly malicious URL:
- http://{pseudorandom}.biz/search?q={value}
- http://{pseudorandom}.cc/search?q={value}
- http://{pseudorandom}.org/search?q={value}
- http://{pseudorandom}.net/search?q={value}
- http://{pseudorandom}.com/search?q={value}
- http://{pseudorandom}.ws/search?q={value}
- http://{pseudorandom}.cn/search?q={value}
- http://{pseudorandom}.info/search?q={value}
It connects to the following time servers to determine the current date:
- myspace.com
- msn.com
- ebay.com
- cnn.com
- aol.com
- w3.org
- ask.com
- yahoo.com
- google.com
- baidu.com
SOLUTION
9.300
9.406.01
19 Sep 2012
9.407.00
19 Sep 2012
Step 1
For Windows XP and Windows Server 2003 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
Step 3
To delete the random service key this malware/grayware created:
- Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
- Open Registry Editor. To do this, click Start>Run, type regedit in the text box provided, then press Enter.
- Press CTRL+F.
- In the Find dialog box, type the file name of the malware detected earlier.
(Note: Make sure that only the data checkbox is selected, then click Find Next.) - Once found, in the right panel, check if the result is the following value-data pair:
ImagePath = {malware/grayware path and file name} - If yes, in the left panel, locate the service where the data is under.
- Right-click on the located service in the left panel and choose Delete.
- Repeat steps 2 to 6 until the Finished searching through the registry dialog box appears.
- Close Registry Editor.
Step 4
Search and delete these folders
- {drive letter}:\Recycler\{SID}
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DOWNAD.EJ. 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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