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BackDoor.RMS.181

Added to the Dr.Web virus database: 2020-11-12

Virus description added:

Packer: absent

Compilation date: absent

SHA1 hash:

  • 8d1b7d738c4c0f0aba5c25b096b54b3fc20e5643

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 created with MSI Configurator from the Remote Utilities Viewer. It spreads within the self-extracting 7z-dropper (52c3841141d0fe291d8ae336012efe5766ec5616) via phishing emails. The backdoor is designed to remotely control the infected computer.

Operating routine

Content of the dropper:

  • host6.3_mod.msi (a pre-configured MSI package)
  • installer.exe (5a9d6b1fcdaf4b2818a6eeca4f1c16a5c24dd9cf), signed with a valid digital signature
.>sigcheck.exe -a installer.exe
Verified:       Signed
Signing date:   4:20 08.05.2015
Publisher:      Usoris Systems
Company:        Usoris Systems LLC
Description:    Remote Utilities
Product:        Remote Utilities
Prod version:   6.3.0.1
File version:   6.3.0.1
MachineType:    32-bit
Binary Version: 6.3.0.1
Original Name:  n/a
Internal Name:  Remote Utilities part
Copyright:      Copyright © 2015 Usoris Systems LLC All rights reserved.
Comments:       Modified by an unpaid evaluation copy of Resource Tuner Console 2 (www.heaventools.com)
Entropy:        6.599

Self-extracting archive script:

;!@Install@!UTF-8!
RunProgram="hidcon:installer.exe /rsetup"
GUIMode="2"
;!@InstallEnd@!

After unpacking, the dropper launches the installer.exe, which in turn initiates installation of a pre-configured MSI package. The installer extracts and silently installs the Remote Utilities program. After installation, it sends a notification to the C&C server.

#drweb BackDoor.RMS.181

The MSI package contains all the necessary parameters for silently installing the Remote Utilities. Installation is performed in Program Files\Remote Utilities - Host in accordance with the Directory table.

#drweb BackDoor.RMS.181

According to the CustomAction table, the msiexec.exe installer launches the main module of the Remote Utilities package rutserv.exe with various parameters that provide:

  • Silent installation,
  • The addition of firewall rules, and
  • Service start up.

#drweb BackDoor.RMS.181

The sequence is defined by the value of the Sequence field for the corresponding action in the InstallExecuteSequence table.

#drweb BackDoor.RMS.181

Connection parameters and settings are added in the HKLM\Remote Utilities\v4\Server\Parameters registry key. The parameter values are stored in the Registry table:

#drweb BackDoor.RMS.181

The CallbackSettings parameter contains the address of the server to which the InternetID is sent for direct connection:

[{317B3E33-A4DE-4EC5-A954-28C2B8AAF218}]
internal_connection_id=--
host=194.9.176.37
port=5651
text_message=
auto_connect=1
status=2
display_name=194.9.176.37
disallow_tray_connect=0
append_computer_name=1
[{13BD64A6-87CB-4065-9AF6-8F9427F3A2E1}]
internal_connection_id=--
host=194.9.176.38
port=5651
text_message=
auto_connect=1
status=2
display_name=194.9.176.38
disallow_tray_connect=0
append_computer_name=1
[{D6FE29FE-11E2-4492-B662-8414706755DF}]
internal_connection_id=--
host=194.9.176.38
port=81
text_message=
auto_connect=1
status=2
display_name=194.9.176.38
disallow_tray_connect=0
append_computer_name=1
[{B7C30242-C4A1-4767-992A-37CC3AA568F6}]
internal_connection_id=--
host=194.9.176.39
port=81
text_message=
auto_connect=1
status=2
display_name=194.9.176.39
disallow_tray_connect=0
append_computer_name=1

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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