BKDR_KEYLOGGER.C
Microsoft: VirTool:Win32/VBInject.gen!EC; Kaspersky: Trojan.Win32.Pincav.afwh
Windows 2000, XP, Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
It sends the stolen information to a specific port via injected code in IEXPLORE.EXE.
After a successful connection to the server, it then waits for a command from the server. The commands received depend on the malware author/server's reply, it can be download command or any other command that can fit in its space in the memory. The download routine code is technically not on the malware file. But the server can send a download routine code which the malware could execute. However during testing no successful connection can be established. The port used by the malware may also change depending on the reply from the server.
This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.
It opens a hidden instance of Internet Explorer to send stolen information to a certain site. It logs a user's keystrokes to steal information.
TECHNICAL DETAILS
151,552 bytes
PE
Yes
17 Nov 2010
Hides files and processes, Drops files
Arrival Details
This backdoor may be downloaded by other malware/grayware/spyware from remote sites.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This backdoor drops the following copies of itself into the affected system:
- %Windows%\crss.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It injects threads into the following normal process(es):
- IEXPLORE.EXE
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Cisco VPN Adapter = "%Windows%\crss.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{00F6F132-7AC8-1AF4-37B9-4B38E166CF65}
StubPath = "%Windows%\crss.exe"
Other System Modifications
This backdoor adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{00F6F132-7AC8-1AF4-37B9-4B38E166CF65}
Dropping Routine
This backdoor drops the following file(s), which it uses for its keylogging routine:
- %Windows%\crss
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Information Theft
This backdoor opens a hidden instance of Internet Explorer to send stolen information to the following site:
- {BLOCKED}t.game-host.org
It logs a user's keystrokes to steal information.
Other Details
This backdoor does the following:
- It sends the stolen information at port 433 via injected code in IEXPLORE.EXE.
- After a successful connection to the server, it then waits for a command from the server. The commands received depend on the malware author/server's reply, it can be download command or any other command that can fit in its space in the memory. The download routine code is technically not on the malware file. But the server can send a download routine code which the malware could execute. However during testing no successful connection can be established. The port used by the malware may also change depending on the reply from the server.
SOLUTION
8.900
7.629.00
17 Nov 2010
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
Restart in Safe Mode
Step 3
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Cisco VPN Adapter=%Windows%\crss.exe
- Cisco VPN Adapter=%Windows%\crss.exe
Step 4
Delete this registry key
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
- {00F6F132-7AC8-1AF4-37B9-4B38E166CF65}
- {00F6F132-7AC8-1AF4-37B9-4B38E166CF65}
Step 5
Search and delete these files
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_KEYLOGGER.C. 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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