Infection Channel: Dropped by other malware, Downloaded from the Internet
This Backdoor 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 connects to a website to send and receive information.
File Size: 2,142,300 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 08 Sep 2021
Payload: Connects to URLs/IPs
This Backdoor 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:
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
This Backdoor connects to the following websites to send and receive information:
Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.956.01
FIRST VSAPI PATTERN DATE: 08 Sep 2021
VSAPI OPR PATTERN File: 16.957.00
VSAPI OPR PATTERN Date: 09 Sep 2021
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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.
Restart in Safe Mode
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To restart in Safe Mode:
• For Windows 7 and Windows Server 2008 (R2) users
Restart your computer.
Press F8 after the Power-On Self Test (POST) routine is done. If the Advanced Boot Options menu does not appear, try restarting and then pressing F8 several times after the POST screen is displayed.
On the Advanced Boot Options menu, use the arrow keys to select the Safe Mode option, and then press Enter.
• For Windows 8, Windows 8.1, and Windows Server 2012 users
Access the Charms bar by moving your mouse pointer to the upper right corner of the screen.
Move your mouse pointer down and click Settings>Change your PC Settings.
In the left panel, click General.
In the right panel, scroll down to the bottom to find the Advanced startup section, then click the Restart now button and wait for the system to restart.
In the Advanced Startup menu, click Troubleshoot>Advanced Options>Startup Settings>Restart and wait for the system to restart.
In the Startup Settings menu, press 4 to enable safe mode.
• For Windows 10 users
Press Windows logo key + I on your keyboard to open Settings. If that doesn't work, select the Start button, then select Settings.
Select Update & Security > Recovery.
Under Advanced startup, select Restart now.
After your PC restarts to the Choose an option screen, select Troubleshoot > Advcanced options > Startup settings > Restart.
After your PC restarts, you'll see a list og options. Select 4 or press F4 to start your PC in Safe Mode.
Identify and terminate files detected as Backdoor.Win64.COBEACON.OSLJAU
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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 7 and Server 2008 (R2) users, click the Processes tab. • For Windows 8, 8.1, 10, and Server 2012 (R2) 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.
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win64.COBEACON.OSLJAU. 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.