FOR CUSTOMERS

Library
My library

+ Add to library

Contact us
24/7 Tech support | Rules regarding submitting

Send a message

Your tickets

Profile

Trojan.Uacbypass.21

Added to the Dr.Web virus database: 2021-10-23

Virus description added:

Packer: absent

Compilation date: 2019-09-29

  • SHA1 hash: 7412b13e27433db64b610f40232eb4f0bf2c8487

Description

The trojan is written in C. Used to elevate backdoor privileges. Disguises itself as a legitimate process and uses a COM object to bypass User Account Control (UAC) to elevate the privileges of the executable process.

Operating routine

Trojan disguises as a legitimate process C:\Windows\explorer.exe via PEB (Process Environment Block). This is done in order to fool the IFileOperation COM object into thinking it is being called from a Windows Explorer shell.

#drweb

#drweb

The trojan obtains a COM object to implement UAC bypass via privilege elevation https://github.com/cnsimo/BypassUAC/blob/master/BypassUAC_Dll/dllmain.cpp [^]:

#drweb

It allows Trojan.Uacbypass.21 to run the file that was passed to it as an argument as a legitimate Windows process:

#drweb

#drweb

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android

© Doctor Web
2003 — 2022

Doctor Web is a cybersecurity company focused on threat detection, prevention and response technologies