Summary
Ursnif steals system information and attempts to steal banking and online account credentials.
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 updatesFirst, check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sampleAfter 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 scanningIf 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
Behavior
Infection Vector
Files Added
- Create a copy of itself at "%appdata%\[Random_Folder]\[Dropped_Filename].exe" where "Dropped_Filename" is a combination of strings taken from %system32% directory filenames.
- Creates a batch file at "%temp%\[Random_Folder]\[Random_File].bat" to execute and delete itself.
- Creates a storage file at %temp%\[Random_Hex].bin to store the stolen data. Stolen data is in cab file format, which is created by executing makecab.exe. The storage file contains the following information:
- Installed Device Drivers - Collected by executing driverquery.exe
- Installed Programs - Collected by executing reg.exe "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall"
- System Information - Collected by executing systeminfo.exe
- Current running process - Collected by executing tasklist.exe /SVC
Registry Changes
- HKCU\Software\Microsoft\Windows\CurrentVersion\Run\[Dropped_Filename]: "%appdata%\[Random_Folder]\[Dropped_Filename].exe
- HKCU\Software\AppDataLow\Software\Microsoft\{GUID}\Vars
- HKCU\Software\AppDataLow\Software\Microsoft\{GUID}\Files
- HKCU\Software\AppDataLow\Software\Microsoft\{GUID}\Config
Network Activity
- bergesoma[.]com/images/[encryted_data]/[.jpeg|.gif|.bmp]
- polinodara[.]com/images/[encryted_data]/[.jpeg|.gif|.bmp]
Other Behavior
- Steal email data, which is collected by parsing different email file formats and applications (.wab, .pst)
- Intercept the data and web-forms of the following browsers: Chrome, Internet explorer, Thunderbird, Firefox
- Check for the presence of a virtual environment by checking the Device Informaton string against "vbox", "qemu", "vmware", "virtual hd"
- Detect Phishwall software
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