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BackDoor.RMS.187

Added to the Dr.Web virus database: 2020-11-26

Virus description added:

Packer: absent

Compilation date: absent

SHA1 hash:

  • 12497d7c24011078cce12100f57a1cf368a3b17f

Description

RAT malware that operates in the 32-bit and 64-bit versions of Microsoft Windows operating systems. The studied sample is an MSI package with pre-configured remote control parameters to silently install the Remote Utilities software. It spreads within the malicious RAR-archive via phishing link. The backdoor is designed to remotely control the infected computer.

Operating routine

It is launched by a dropper that stores the installation archive in the resources section under the name LOG. The dropper saves the MSI package to the %TEMP% directory as KB8438172.msi and then launches it using the msiexec.exe installer. The dropper contains the source path — C:\Users\Kelevra\Desktop\Source\Project1.vbp.

#drweb BackDoor.RMS.187

The backdoor indicates it is ready for connection by sending a message to cerbe[@]protonmail[.]com.

This sample is notable for its distribution method. The victim receives a phishing email containing a link disguised as an important attachment.

The download link leads to
http[:]//ateliemilano[.]ru/stat/amsweb.php?eTmt6lRmkrDeoEeQB6MOVIKq4BTmbNCaI6vj%2FvgYEbHFcfWecHRVZGMpkK%2BMqevriOYlq9
CFe6NuQMfKPsSNIax3bNKkCaPPR0RA85HY4Bu%2B%2B6xw2oPITBvntn2dh0QCN9pV5fzq3T%2FnW270rsYkctA%2FwdvWH1bkEt2AdWnyEfaOwsKsSpyY
3azVX0D%2BKOm5
.

From that address the victim is redirected to https[:]//kiat[.]by/recruitment/CV_Ekaterina_A_B_resume.rar, which is used to download the malicious archive.

ateliemilano[.]ru and kiat[.]by are actual websites, and the latter belongs to the recruitment agency. According to our information, they were repeatedly used for uploading trojans, as well as for redirecting requests to download malware.

Artifacts

During the investigation, we uncovered other compromised websites that distributed similar droppers with MSI packages. Some of them had the same redirect mechanisms as ateliemilano[.]ru. Some resources were allegedly used to upload trojans written in Visual Basic .NET (Trojan.GidraNET.1), which among other functionality, upload malicious droppers to compromised computers.

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.
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  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.

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