TSPY_ZBOT.MNS
PWS:Win32/Zbot (Microsoft); PWS:Win32/Zbot (Kaspersky); Trojan.Zbot (Norton)
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: Spyware
Destructiveness: No
Encrypted:
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.
It modifies Internet Explorer security settings. This puts the affected computer at greater risk, as it allows malicious URLs to be accessed by the computer.
It deletes itself after execution.
TECHNICAL DETAILS
598,633 bytes
EXE
12 Aug 2014
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%\{random folder 1}\{random file name}.exe
- %Application Data%\{random folder 2}\{random file name}.{random extension}
- %Application Data%\{random folder 2}\{random file name}.tmp
- %Application Data%\Microsoft\Address Book\{user name}.wab
- %Application Data%\Microsoft\Address Book\{user name}.wab~
- %Application Data%\{random folder 3}\{random file name}.{random extension}
(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.)
It creates the following folders:
- %Application Data%\{random folder 1}
- %Application Data%\{random folder 2}
- %Application Data%\{random folder 3}
(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 spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random characters} = "%Application Data%\{random folder 1}\{random file name}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
{random key 1}
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\WAB File Name
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = "1"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\WAB File Name
(Default) = "%Application Data%\Microsoft\Address Book\{user name}.wab"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Privacy
CleanCookies = "0"
HKEY_CURRENT_USER\Software\Microsoft\
{random key 1}
{random 2} = "{hex values}"
HKEY_CURRENT_USER\Software\Microsoft\
{random key 1}
{random 1} = "{hex values}"
Web Browser Home Page and Search Page Modification
This spyware modifies Internet Explorer zone settings.
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}nc.info/opy/file.php
- http://www.{BLOCKED}e.com/webhp
- http://{BLOCKED}nc.info/opy/gate.php
It deletes itself after execution.
SOLUTION
9.700
Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.MNS. 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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