BKDR_HIKIT.A
Backdoor.Hikit (Symantec)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
This backdoor may arrive bundled with malware packages as a malware component. It may be dropped by other malware.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
262,656 bytes
DLL
Yes
21 Aug 2012
Arrival Details
This backdoor may arrive bundled with malware packages as a malware component.
It may be dropped by other malware.
Installation
This backdoor drops the following file(s)/component(s):
- %System%\drivers\W7fw.sys - detected as RTKT_HIKIT.A
It drops the following non-malicious files:
- %Temp%\w7fw.cat
- %Temp%\w7fw.inf
- %Temp%\w7fw_m.inf
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Execute a command shell
- Open a connection using SOCKS5 proxy
- Stop execution
- Transfer files to/from remote server
NOTES:
This backdoor drops the file, %System%\drivers\W7fw.sys, which varies from 32-bit or 64-bit malware depending on the platform of the infected system.
It installs the certificate %Temp%\w7fw.cat on the infected system.
It attempts to Disable Device Driver Signing to successfully install %System%\drivers\W7fw.sys as device driver.
It adds the following registry entries that enables it to automatically execute during startup:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W7fw
DisplayName = "W7fw Service"
ErrorControl = "1"
ImagePath = "%System%\DRIVERS\W7fw.sys"
Start = "3"
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W7fwMP
ErrorControl = "1"
ImagePath = "%System%\DRIVERS\W7fw.sys"
Start = "3"
Type = "1"
SOLUTION
9.200
9.338.07
22 Aug 2012
9.339.00
22 Aug 2012
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 3
Search and delete these files
- %Temp%\w7fw.cat
- %Temp%\w7fw.inf
- %Temp%\w7fw_m.inf
Step 4
Scan your computer with your Trend Micro product to delete files detected as BKDR_HIKIT.A. 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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