Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
This malware is involved in the Master Boot Record (MBR) wiper outbreak that targeted users in South Korea during March of 2013. It has a destructive payload that wipes the affected system's MBR. Users affected by this malware may find their systems freezing, shutting down, and unable to run.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
This Trojan may be dropped by other malware.
This Trojan may be dropped by the following malware:
This Trojan terminates the following processes if found running in the affected system's memory:
It overwrites the Master Boot Record (MBR) of the affected system with the strings PRINCPES or HASTATI. or PR!NCPES.
Overwriting the MBR prevents systems from loading the OS. It checks if the affected computer's system time is March 20, 2013 2:00pm or later. If the date is earlier, it remains dormant.
For Windows Vista and higher versions, it searches for all files in all folders and subfolders in all fixed and removable drives. It overwrites the files with a series of repetitive words and then deletes the files and folders. The files in the system root are the last to be overwritten.
For operating systems lower than Windows Vista, it overwrites the Volume Boot Record (VBR) of all fixed and removable drives.
It automatically restarts the system to let the infection take effect.
Restore your system's Master Boot Record (MBR)
To restore your system's Master Boot Record (MBR):
• On Windows 2000, XP, and Server 2003:
• On Windows Vista and 7:
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Remove malware/grayware files that dropped/downloaded TROJ_KILLMBR.SM
Scan your computer with your Trend Micro product to delete files detected as TROJ_KILLMBR.SM. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.