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Trojan.GidraNET.1

Added to the Dr.Web virus database: 2020-11-27

Virus description added:

Packer: absent

Compilation date:

16.06.2019 02:06:09

SHA1 hash:

  • 7c9902fdddbbdf16ee6e29939059b5cb79c1d9ee

Description

A trojan written in Visual Basic .NET and designed to run on 32-bit and 64-bit versions of Microsoft Windows operating systems. The studied sample was distributed through compromised websites. It is designed to collect system information and transmit it to attackers over FTP protocol. It also downloads a malicious dropper with an MSI package to install Remote Utilities software. Based on our information, we assume that in 2019 the Trojan.GidraNET.1 creator used this trojan to initially infect the system through a phishing email and ultimately upload the backdoor that silently installs Remote Utilities software on the compromised computer.

Operating routine

The main functionality is stored in the readConfig method called from Form1_Load.

#drweb Trojan.GidraNET.1

At the beginning of operation, it collects the following information about the system:

  • External IP address
  • Username
  • Computer name
  • OS version
  • Motherboard and CPU used
  • RAM amount
  • Disks and partitions
  • Network adapters and their MAC addresses
  • Clipboard contents

#drweb Trojan.GidraNET.1

The trojan saves the gathered information to a file and takes a screenshot.

#drweb Trojan.GidraNET.1

It sends information about the system over FTP to the ateliemilano[.]ru server.

#drweb Trojan.GidraNET.1

The username and password to access the FTP server are hardcoded in trojans body. A separate directory is created for each infected computer.

#drweb Trojan.GidraNET.1

After sending the information, the trojan launches the file downloaded from another compromised server.

#drweb Trojan.GidraNET.1

The files downloaded by similar malicious samples are droppers written in Visual Basic that contain MSI packages to silently install Remote Utilities software such as BackDoor.RMS.187.

Artifacts

The sample contains the path to the PDB file: C:\Users\Kelevra\Desktop\Last Gidra + PrintScreen + Loader_ Main\Gidra\obj\Debug\Gidra.pdb. The username matches the username in the project file path in the BackDoor.RMS.187: C:\Users\Kelevra\Desktop\Source\Project1.vbp. Other variants were found in similar samples:

C:\Users\Kelevra\Desktop\SystemUpdater (full)\UnptotectPasswords\obj\x86\Release\Microsoft Word Document.pdb
D:\iCyberLab Data\XAV+Gidra\Last Gidra + PrintScreen + Loader_ Main\Gidra\obj\Debug\myCV_Resume.pdb
D:\iCyberLab Data\XAV+Gidra\Last Gidra + PrintScreen + Loader_ Main\Gidra\obj\Debug\Murzina_Viktoriya_CV.pdb
D:\iCyberLab Data\XAV+Gidra\Last Gidra + PrintScreen + Loader_ Main\Gidra\obj\Debug\CV_Resume_Volkova.pdb

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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