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Threat Monitor
Backdoor.Win32.Clampi.a
| Aliases: | |
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| Pattern: | 200909231330 |
| Threat Type | Propagation Methods | Systems Affected | Risk Level |
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Technical details
This Trojan spy program is designed to steal confidential user data and remotely manage the victim machine. It is a Windows PE EXE file. It is 470 bytes in size.
Installation
When launched, the Trojan creates the following file:
%AppData%\<name>.exe
<name&gr; is chosen at random from the list below:
dumpreport msiexeca svchosts upnpsvc service taskmon rundll helper event logon sound lsas
In order to ensure that the Trojan is launched automatically when the system is rebooted, the Trojan adds a link to its executable file in the system registry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run] “<name2>” = %AppData%\<name>.exe|
<name2&gr; is chosen at random from the list below:
CrashDump svchosts EventLog TaskMon Windows RunDll System Setup Sound lsass UPNP Init
Payload
The Trojan connects to servers to download and run malicious code. The server addresses are saved to the system registry key shown below:
HKCU\Software\Microsoft\Internet Explorer\Settings\"GatesList"
The Trojan saves its settings to the registry keys shown below:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Settings\"GID" HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Settings\"KeyM" HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Settings\"KeyE" HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Settings\"PID
The malicious code downloaded from the servers is designed to harvest information from the victim machine (user name, login data, program passwords, local and network passwords).
The Trojan can also be configured to steal login and password data for Internet banking systems by substituting spoofed pages for genuine banking system pages. The program targets popular financial organizations such as the ones listed below:
https://www.hsbc.co.uk https://www.mybusinessbank.co.uk https://investing.schwab.com
The Trojan will regularly download updates to its code and additional modules. The programs downloaded include:
- Trojan programs designed to steal bank account data
- Trojans designed to steal passwords to common applications such as:
Browsers
IE Password Protected Sites IE AutoComplete Fields Firefox OperaMessengers
MSN MessengerICQ
IRQ
Trillian
Miranda IM
Camfrog Video Chat
Easy Web Cam
Google Talk
FTP Programs
Total CommanderWS FTP
SecureFX FTP
WebDrive Ftp
FtpVoyager
AutoFTP
FTP Control
32bit Ftp
FTP Navigator
Far FTP
FlashFXP FTP
CuteFTP
CoffeeCup FTP
FileZilla FTP
FTP Now
CoreFTP
SmartFTP
Other Programs
Outlook ExpressDial Up
VNC
Remote Desktop
WinProxy
Google Desktop
Network propagation
In order to spread via the local network, the Trojan ties to copy itself to network machines by using ipc$ and admin$ and also shared folders. In order to launch itself on networked machines, the Trojan uses a legitimate utility, Sysinternal's psexec.exe.
Note
In order to prevent the malicious program spreading via networks, servers used by domain administrators should be disinfected. Additionally strong passwords should be used on local machines.
The Trojan downloads a variety of code from servers. This code can be modified or replaced with other malicious code. At the time of writing, the Trojan was configured to connect to the addresses listed below:
panel.***boora.cn 147.202.39.*** 174.36.82.*** 195.12.38.*** 195.189.247.*** 195.225.236.*** 205.234.231.*** 209.51.159.*** 209.85.120.*** 61.153.3.*** 64.18.143.*** 66.128.55.*** 66.199.237.*** 66.199.237.*** 66.225.237.*** 66.7.197.*** 75.102.23.***
The Trojan only runs on English versions of Windows.
Removal instructions
If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:
- Use Task Manager to terminate the malicious process.
- Delete the original backdoor file (the location will depend on how the program originally penetrated the victim machine).
- Delete the file created by the backdoor:
%AppData%\<name>.exe
- Delete the following system
registry key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run] "<name2>" = %AppData%\<name>.exe
Update your antivirus databases and perform a full scan of the computer .