Infection Channel: Dropped by other malware, Downloaded from the Internet
This malware is involved in the filelessly-installed backdoor malware attack discovered early August 2017. It is able to install a backdoor malware onto the systems it infects. Users affected by this malware may find their systems exhibiting malicious routines.
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be downloaded by other malware/grayware from remote sites.
It does not have any propagation routine.
It does not have any backdoor routine.
File Size: 28,735 bytes
File Type: PS1
Memory Resident: Yes
Initial Samples Received Date: 29 Jun 2017
Payload: Connects to URLs/IPs, Downloads files
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It may be downloaded by the following malware/grayware from remote sites:
It may be downloaded from the following remote sites:
This Trojan does not have any propagation routine.
This Trojan does not have any backdoor routine.
This Trojan does not have rootkit capabilities.
This Trojan connects to the following website(s) to download and execute a malicious file:
This Trojan does the following:
The downloaded file (normal file, favicon) will not be saved in the machine, thus, it will be decrypted using RC4 Algorithm, in order to produce a malicious DLL file, which will be injected in the malware's process directly, using ReflectivePEInjection function
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.
Identify and terminate files detected as TROJ_PSINJECT.A
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Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
To terminate the malware/grayware/spyware process:
Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
Open Windows Task Manager. To do this, press CTRL+SHIFT+ESC.
View the list of all running programs. To do this: • For Windows 2000, XP, Server 2003, Vista, 7 and Server 2008 users, click the Processes tab. • For Windows 8, 8.1 and Server 2012 users, click the Details tab.
In the list of running programs, locate a malware/grayware/spyware file detected earlier.
Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
Close Task Manager.
Scan your computer with your Trend Micro product to delete files detected as TROJ_PSINJECT.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.