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Trojan.DownLoader34.31724

Added to the Dr.Web virus database: 2020-09-03

Virus description added:

Compilation dates:

  • 01:51:56 23.07.2020 (x86 version)
  • 01:49:20 20.05.2020 (x64 version)

SHA1 hashes:

  • bbb29d96809bcd4c0e75df8f08f3e9dbc817f584 (x86 version)
  • 091866cac1bef518dbb6d114b3636fbad144b49a (x64 version)

Description

Trojan.DownLoader34.31724 is a shellcode loader written in C++. It works both in 32-bit and 64-bit Microsoft Windows operating systems.

Operating routine

The C&C server address is hardcoded in trojan’s body and is plain text: https://newsfor[.]newss[.]nl.

Using the CoCreateGuid function, the program generates a GUID (Globally Unique Identifier), which is then used as the identifier of the infected device.

It then sends a GET request to the C&C server with the User-Agent: "WinHTTP Example/1.0" HTTP header to https://newsfor[.]newss[.]nl/<uuid>&0&4, where:

  • <uuid> — previously created uuid,
  • 0 — the sequence number of the request,
  • 4 — a number, hardcoded in the trojan’s body.

In response to this GET request, the trojan waits for the shellcode delivery, and then sends another GET request. If the first DWORD in the response is equal to 1, it then executes the previously received shellcode.

The result of the shellcode execution is sent by a POST request to the same URL that is used for GET requests.

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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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.

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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.

Find out more about Dr.Web for Android

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