Trojan:W32/DNSChanger.ARNF
Summary
A trojan, or trojan horse, is a seemingly legitimate program which secretly performs other, usually malicious, functions. The program is often started by the user, and it does not usually replicate.
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.
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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
This malicious software is dropped onto the system by Trojan-Dropper:W32/Agent.FLN. It is used to change the DNS settings on a system so that information such as passwords and credit card details can be retrieved.
InstallationDuring installation, this malware creates the following files:
- c:\autorun.inf - contains the autostart routine for c:\resycled\boot.com
- c:\resycled\boot.com - detected as Trojan:W32/DNSChanger.ARNF
It also creates this directory:
- c:\resycled
Execution
Once installed, this malware attempts to connect to a website via HTTP POST:
- https://94.247.2.104/[...]/generator
It is capable of changing the DNS settings in the machine to:
- 85.255.115.237
- 85.255.112.201.
Registry Modifications
Sets these values:
- HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Windows\ControlActiveService = Spooler
- HKEY_LOCAL_MACHINE\SOFTWARE\Classes\msqpdxvxmsqpdxrun = dword:00000047msqpdxpff =msqpdxaff =msqpdxinfo =msqpdxid = "rfx ||fcegeea "msqpdxsrv = dword:6802f719
- HKEY_CLASSES_ROOT\msqpdxvxmsqpdxrun = dword:00000047msqpdxpff =msqpdxaff =msqpdxinfo =msqpdxid = "rfx ||fcegeea "msqpdxsrv = dword:6802f719
Creates these keys:
- HKEY_LOCAL_MACHINE\Software\Classes\msqpdxvx
- HKEY_CLASSES_ROOT\msqpdxvx
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