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F-Secure Malware Information Pages: Spybot.HS
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Summary
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| Spybot.HS, a variant of Spybot, is a Trojan. Spybot.HS uses IRC networks to spread and has automatic updating capabilities. Spybot.HS steals certain information from an infected computer. |
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Disinfection
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Automatic Disinfection
Usually standalone malware (backdoors, worms, trojans, etc.) is automatically removed by F-Secure Anti-Virus (FSAV) starting from version 5.40. Malware files get automatically renamed by FSAV, so they can not be started any more. In some rare cases, when automatic disinfection is not possible, a user can select disinfection action by him/herself to make FSAV rename or delete an infected file. In some special cases, it is recommended to use specific disinfection tools provided by F-Secure. They can be downloaded from our ftp site:
ftp://ftp.f-secure.com/anti-virus/tools/
F-Secure Anti-Virus can be purchased from our webshop or from our authorized distributors. A trial version of F-Secure Anti-Virus, limited up to 30 days, can be downloaded from our website:
http://www.f-secure.com/download-purchase/
All the latest versions of FSAV can download anti-virus database updates automatically. However, these updates can be also downloaded and installed manually from our web or ftp sites:
http://www.f-secure.com/download-purchase/updates.shtml
Manual Disinfection
To manually disinfect standalone malware (backdoors, worms, trojans, etc.) it's usually enough to delete all infected files from a computer and to restart it. Active malware files are usually locked by the operating system so different disinfection approaches are required for different operating systems.
Please note that manual disinfection is a risky process, so it is recommended only for advanced users.
If Windows 95, 98 and ME operating system is used, it is recommended to restart a computer from a bootable system diskette and to delete an infected file from the command prompt. For example, if a malicious file named ABC.EXE is located in the Windows folder, it is usually enough to type the following command at command prompt:
DEL C:\WINDOWS\ABC.EXE
and press Enter. After that, the infected file will be gone. If Windows NT, 2000 or XP is used, a malicious file has to be renamed with a different extension (for example .VIR) and then a system has to be restarted. After restarting, a renamed malicious file will no longer be active and it can be easily to delete manually.
Malware Disinfection Tools
F-Secure provides disinfection tools for certain malware. These tools can be downloaded from this webpage:
http://www.f-secure.com/download-purchase/tools.shtml
ftp://ftp.f-secure.com/anti-virus/tools/
Windows System Restore Issues
If Windows ME or XP is used, it is recommended to disable System Restore feature of these operating systems to prevent a computer from re-infection by an already removed malware. The fact is that the System Restore feature of these operating systems might save an infected file into the special folder and copies it back into a hard drive every time it has been renamed or deleted by F-Secure Anti-Virus or by a user. Instructions on how to disable the System Restore features are here:
Windows ME:
http://www.f-secure.com/v-descs/sfc_dis.shtml
Windows XP:
http://www.f-secure.com/v-descs/sfc_dis1.shtml
It is recommended to re-enable System Restore after disinfection in order to restore stable system configuration, in case of any crash or incompatibility issue occurs in the future.
Failed Disinfection
In some cases,F-Secure Anti-Virus might not disinfect a system automatically. In this case, please visit our Support pages:
http://support.f-secure.com/enu/home/virusproblem/howtoclean/ |
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Detailed Description
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Spybot.HS allows control of a victims' computer remotely by sending specific commands via IRC channels. This backdoor can also steal data, spread to the local network, and to computers vulnerable to exploits.
It drops the following file upon execution:
- %Sysdir%\windows.exe - Copy of itself.
It will then pass the control over to the dropped file and delete itself after execution.
Spybot.HS also checks for the existence of the following mutex to ensure that there is only one instance of itself running in memory:
Spybot.HS adds these registry value launch points:
- [HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices]
InternetExplorer2 = %Sysdir%\windows.exe - [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]InternetExplorer2=%Sysdir%\windows.exe
It also adds the following registry entry as part of its installation routine:
- [HKEY_CURRENT_USER\Software\Microsoft\OLE]
InternetExplorer2 = %Sysdir%\windows.exe
It also creates the following registry entry to allow itself to bypass the Windows Firewall:
- [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy
\StandardProfile\AuthorizedApplications\List]
%Sysdir%\windows.exe = "%Sysdir%\windows.exe:*:Enabled:InternetExplorer2"
Spybot.HS also connects to the following IRC server:
- ircds.windowsantivirussystem.org:3132
It then joins the following IRC channel:
Once connected, Spybot.HS awaits for commands from a remote user. It may perform the following backdoor operations:
- Acquire system information
- Download files from the Internet
- Execute/Delete files
- Perform IRC commands
- Search for vulnerabilities
- Terminate processes
- Update itself
This backdoor may spread through local networks by taking advantage of the following vulnerabilities:
- ASN.1 Vulnerability (MS04-007)
- DCOM RPC Vulnerability (MS03-026) TCP port 135.
- LSASS vulnerability (MS04-011) TCP port 445.
- Microsoft Windows Server Service Remote Buffer Overflow Vulnerability (MS06-040)
Spybot.HS is packed with ASProtect 2.1 and ASPack 2.12 |
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Detection
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F-Secure Anti-Virus detects this malware with the following updates: [FSAV_Database_Version] Version = 2007-01-09_04.
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F-Secure Corporation |
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Last Modified: January 10, 2007
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