Rootkit:W32/Zxshell.B
Summary
Rootkit:W32/Zxshell.B is dropped by Backdoor:W32/Zxshell.A and basically functions as a protection mechanism for its main payload file.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
- Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
- Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
Rootkit:W32/Zxshell.B tries to protect the main payload DLL file by:
- Hiding files which contains underscore "_" by installing hooks to the file system driver
- Attempting to hide the tcp port 443
- Detect if the following security product exist:
- NOD32
- AVP
- 360Safe
- AVG
- Avast
- AhnSD
- McShield
- IceSword
The driver can easily crash the system when it fails in its attempt to hook the kernel drivers, for example the ntfs.sys and tcpip.sys.
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