Hearse
Summary
Hearse.A is a backdoor that steals passwords and account information. It also installs a SOCKS proxy and a backdoor that allows access to an infected system. Hearse.A uses rootkit techniques to hide its files.
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:
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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.
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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.
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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
System installation
When the backdoor file is run, it drops the following two files to the Windows system directory:
- zopenssl.dll
- zopenssld.sys
Then the backdoor creates the following registry key: [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\zopenssl] "DllName" = "zopenssl.dll" Durin the system start, this registry key loads the backdoor main file, zopenssl.dll, to the address space of Winlogon.exe. When the DLL is activated, it starts the rootkit as a system service and runs the actual backdoor.The rootkit system service is activated using the following arguments:
- BinaryPathName: zopenssld.sys
- ServiceName: zopenssld
- DisplayName: OPENSSL cryptoapi
Hearse.A may also create the following files:
- nwr7.ies4
- bklks.ies4
- nwr8.ies4
Rootkit Hiding Techniques
Hearse.A is able to hide the following items:
- Files and directories
When it is active it hides its own files.Hearse.A installs and executes a kernel-mode driver (zopenssld.sys) to execute code in privilege level 0 (kernel mode). The kernel-mode code replaces the following function pointers from the system service table:
- NtCreateProcess
- NtCreateProcessEx
- NtQueryDirectoryFile
This allows it to inject code into any newly created process. In addition, it hides files or directories with any of the following names:
- nwr7.ies4
- zopenssl.dll
- bklks.ies4
- zopenssld.sys
- nwr8.ies4
Backdoor functionality
Hearse.A uses HTTP requests for communicating with a remote server controlled by the attacker. The server may request the infected system to perform any of the following actions:
- Run any program on the system
- Download additional files
- Spawn an interactive command shell
- Create and send a screenshot of the desktop
- Collect and send passwords and other account information
- Uninstall the backdoor
Hearse.A also starts up a SOCKS proxy on the infected system. The proxy port is reported back to the attacker by including it in the HTTP requests described above.
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