TSPY_CHISBURG.WOKC
Trojan-PSW.Win32.Chisburg.agbw(Kaspersky);
Windows

Threat Type: Spyware
Destructiveness: No
Encrypted: Yes
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 the Internet Explorer Zone Settings.
TECHNICAL DETAILS
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 copies of itself into the affected system:
- %Application Data%\cSl8ooxWZ0\cSl8ooxWZ0.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following files:
- %User Temp%\aut{Random Hex Values}.tmp -> Deleted afterwards
- %User Temp%\62xJCIi.A
- %User Temp%\{10 Random Alphanumeric Characters}.ini -> Deleted afterwards
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %Application Data%\cSl8ooxWZ0\
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Autostart Technique
This spyware drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:
- %User Startup%\cSl8ooxWZ0.eu.url
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Web Browser Home Page and Search Page Modification
This spyware modifies the Internet Explorer Zone Settings.
Information Theft
This spyware attempts to get stored information such as user names, passwords, and hostnames from the following browsers:
- Opera
- Chrome
- Mozilla Firefox
- Safari
Stolen Information
This spyware sends the gathered information via HTTP POST to the following URL:
- http://www.{BLOCKED}agenco.com/deputation/pep/PHP/PHP/index.php?action=add&username={Username}&password={Password}&app={Application}&pcname={Computer Name}&sitename={URL of credentials}
Other Details
This spyware does the following:
- The dropped .url file contains this specific URL value:
- file:///%Application Data%\cSl8ooxWZ0\cSl8ooxWZ0.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
NOTES:
This spyware steals user names and passwords from the following:
SOLUTION
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete these folders
- %Application Data%\cSl8ooxWZ0\
Step 4
Search and delete this file
- %User Temp%\62xJCIi.A
- %User Startup%\cSl8ooxWZ0.eu.url
- %User Temp%\{10 Random Alphanumeric Characters}.ini
- %User Temp%\aut{random hex values}.tmp
Step 5
Scan your computer with your Trend Micro product to delete files detected as TSPY_CHISBURG.WOKC. 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.
Step 6
Reset Internet security settings
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