TSPY_ZBOT.COZ
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Spyware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This spyware 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
198,656 bytes
EXE
Yes
01 Dec 2011
Arrival Details
This spyware 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 spyware drops the following files:
- %Application Data%\{random1}\{random}.exe
- %Application Data%\{random2}\{random}.{random}
(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 creates the following folders:
- %Application Data%\{random1}
- %Application Data%\{random2}
(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.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random CLSID} = "%Application Data%\{random1}\{random}.exe"
Other System Modifications
This spyware adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
{random}
Download Routine
This spyware connects to the following URL(s) to download its configuration file:
- http://{BLOCKED}heat.ru/hiya777.php
As of this writing, the said sites are inaccessible.
NOTES:
The downloaded configuration file contains information where this spyware can download an updated copy of itself, a list of targeted bank-related websites from which it steals information, and the URL where it sends its stolen data.
SOLUTION
9.200
8.616.10
01 Dec 2011
8.617.00
01 Dec 2011
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
Scan your computer with your Trend Micro product and note files detected as TSPY_ZBOT.COZ
Step 3
Restart in Safe Mode
Step 4
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
- {random CLSID} = %Application Data%\{random1}\{random}.exe
- {random CLSID} = %Application Data%\{random1}\{random}.exe
Step 5
Search and delete these folders
- %Application Data%\{random1}
- %Application Data%\{random2}
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.COZ. 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.
NOTES:
The created registry key HKEY_CURRENT_USER\Software\Microsoft\{random} cannot be identified since there are no reference values in the created key. The only way it can be identified is by comparing the present keys with a backup of the system's registry. Note that the key {random} need not to be deleted since it will not cause any system harm.
RECOMMENDATIONS
- Enable real-time scanning of your Trend Micro anti-malware product. Refer to the following Trend Micro support pages to know more about enabling real-time scanning in your Trend Micro product:
- Always keep pattern files and engines up-to-date. To know more about updating your Trend Micro product’s pattern, please refer to the following Trend Micro support page:
http://esupport.trendmicro.com/9/How-do-I-manually-update-the-virus-pattern-of-my-Trend-Micro-Internet.aspx
Note: The steps apply for specific products indicated in the page. - Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. This is important especially for shared computers that are connected to a network.
- Enable firewall to protect against threats: http://esupport.trendmicro.com/3/How-do-I-enable-or-disable-the-Personal-Firewall-of-Trend-Micr-EN-1038273.aspx.
- Enforce a strong password policy. Typically, a strong password consists of a mix of numbers, letters, and characters.
- Keep software and operating systems updated with latest patches released by vendors to address vulnerabilities and exploits.
- Block unused ports to disallow malware from using these ports to communicate and/or enforce commands.
- Be aware of social engineering attacks.
- Use safe coding practices to avoid exploit of websites and applications.
- Avoid accessing the listed malicious URLs to prevent possible re-infection.
- Monitor network connections for any suspicious connection or connectivity.
- Regularly update list of sites that are trusted.
- Turn off file sharing if not needed. If needed, disable anonymous access to shared folders.
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