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1C.Drop.1

Added to the Dr.Web virus database: 2016-06-21

Virus description added:

SHA1:

  • 87e690b5aa60dbb549d8d7e118dc06e4d4314732

A dropper Trojan written in an incorporated programming language of “1C:Enterprise”. The Trojan is designed to run a ransomware Trojan on the infected computer—Trojan.Encoder.567—that is stored in its resources as a payload.

screen 1C.Drop.1 #drweb

The dropper is distributed via email attachments to the message which is titled

Subject: Our BIC code has been changed

and has the following text:

Greetings!
Our BIC code has been changed.
Please update your bank classifier.
The classifier can be updated automatically in 1C Enterprise 8.
File – Open classifier update processor from the attachment.
Click YES to update the classifier automatically.
Within 1-2 minutes if there is Internet connection.

The message contain an EPF file ПроверкаАктуальностиКлассификатораБанков.epf that is implemented as an external data processor for the 1C:Enterprise platform. Its body is protected with a password and looks as follows:

screen 1C.Drop.1 #drweb

If the user run the attached file in 1C: Enterprise mode, the following window is displayed:

screen 1C.Drop.1 #drweb

Clicking on any button of this window will launch 1C.Drop.1. First, it searches the 1C database for contractors with known email addresses and then sends the text message with its own copy attached. The message is determined by the following code:

Текст = Письмо.Тексты.Добавить(“Greetings! Our BIC code has been changed.
	|Please update your bank classifier.
	|The classifier can be updated automatically in 1C Enterprise 8.
	|File – Open classifier update processor from the attachment.
	|Click YES to update the classifier automatically.
	|Within 1-2 minutes if there is Internet connection.
Письмо.Вложения.Добавить(ИмяФайла, "ОбновитьБИКБанка.epf");

The Trojan uses the email address specified in the victim’s 1C user account as the sender’s address. If the user has not specified their email, the Trojan substitutes it with 1cport@mail.ru and attaches the ОбновитьБИКБанка.epf external data processor that contains the Trojan’s copy.

If the file is run in the 1C software, the ransomware Trojan will affect the computer as well; yet, this copy of 1C.Drop.1 will send contractors a corrupted EPF file that cannot be opened with “1C:Enterprise”.

1C.Drop.1 supports the following 1C databases:

  • Trade Management 11.1
  • Trade Management (basic) 11.1
  • Trade Management 11.2
  • Trade Management (basic) 11.2
  • Accounting 3.0
  • Accounting (basic) 3.0
  • 1C:Comprehensive Automation 2.0

Finally, the Trojan extracts Trojan.Encoder.567 from its resources and runs it on the infected computer.

News about the Trojan

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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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.

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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

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