This malware is related to an active campaign that compromised Japanese websites and used these as C&C servers of EMDIVI Backdoor.
To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.
This backdoor may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
It retrieves specific information from the affected system.
This backdoor may arrive bundled with malware packages as a malware component.
It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
This backdoor adds the following processes:
It adds the following mutexes to ensure that only one of its copies runs at any one time:
It injects codes into the following process(es):
This backdoor does not have any propagation routine.
This backdoor executes the following commands from a remote malicious user:
It connects to the following URL(s) to send and receive commands from a remote malicious user:
This backdoor retrieves the following information from the affected system:
This backdoor connects to the following URL(s) to check for an Internet connection:
It requires the following additional components to properly run:
This backdoor does not execute properly if the hostname is similar to any of the following strings:
It enumerates all visible windows and compares each window's title bar text with the following strings:
If a window's title bar text contains any of the said strings, it pauses the execution of its malicious routine by performing a Sleep command.
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Remove the malware/grayware file dropped/downloaded by BKDR_EMDIVI.ZJCH-A. (Note: Please skip this step if the threat(s) listed below have already been removed.)
Identify and terminate files detected as BKDR_EMDIVI.ZJCH-A
Scan your computer with your Trend Micro product to delete files detected as BKDR_EMDIVI.ZJCH-A. 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.