WORM_TOPHOS.AD
Troj/Tiputin-K (Sophos), TrojanDownloader:Win32/Stegvob.D (Microsoft), Win32/Tophos.J worm (ESET)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Propagates via removable drives, Downloaded from the Internet
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.
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
1,421,593 bytes
EXE
Yes
12 Feb 2014
Connects to URLs/IPs, Downloads files
Arrival Details
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.
Autostart Technique
This worm drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\search.cmd
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Propagation
This worm drops copies of itself in the following drives:
- {drive letter}:\Photo.scr
It drops copies of itself in the following shared folders:
- {Shared folder path}\Photo.scr
Download Routine
This worm connects to the following URL(s) to download its component file(s):
- http://www.{BLOCKED}d.net/load.gif?{random number}
It saves the files it downloads using the following names:
- %Application Data%\temp.cmd
(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.)
As of this writing, the said sites are inaccessible.
NOTES:
This worm has a folder icon and opens the following folders to trick users that it is a legitimate folder:
- %User Profile%\Pictures (Windows Vista and higher versions)
- %User Profile%\My Documents\My Pictures (Versions lower than Windows Vista)
SOLUTION
9.700
10.588.03
06 Feb 2014
10.589.00
06 Feb 2014
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
Search and delete these files
- %User Startup%\search.cmd
- %Application Data%\temp.cmd
- {drive letter}:\Photo.scr
- {Shared folder path}\Photo.scr
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_TOPHOS.AD. 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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