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BKDR_GRAVITYRAT.C

May 01, 2018
 Analysis by: Patrick Angelo Roderno
 ALIASES:

Backdoor.MSIL.Agent.zmy (KASPERSKY); Trojan.GenericKD.30663535 (BITDEFENDER); a variant of MSIL/Spy.Agent.BDH trojan (NOD32); Trojan Horse (NORTON)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

161,280 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 Aug 2017

Payload:

Drops files, Steals information, Downloads files, Connects to URLs/IPs

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Backdoor creates the following folders:

  • %ProgramData%\Intel. Inc
  • %ProgramData%\Intel. Inc\Bin
  • %ProgramData%\Intel. Inc\DataCache

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Backdoor Routine

This Backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}date.{BLOCKED}pdates.com:46769/G3/ServerSide/G3.php
  • http://{BLOCKED}tes.{BLOCKED}soft.com:46769/G3/ServerSide/G3.php
  • http://{BLOCKED}server.{BLOCKED}pdates.eu:46769/G3/ServerSide/G3.php

Dropping Routine

This Backdoor drops the following file, into which it saves gathered information:

  • %ProgramData%\Intel. Inc\DataCache\Data.log - contains names of files with specific extensions in all drives
  • %ProgramData%\Intel. Inc\{Generated MD5 hash by malware}.{User code set by malware} - contains the following information:
    • Number of days the backdoor is present in the affected system
    • Total number of files scanned
    • Total number of files uploaded
    • Value that indicates if the stolen information has been sent to C&C server

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Download Routine

This Backdoor accesses the following websites to download files:

  • http://{BLOCKED}date.{BLOCKED}pdates.com:46769/G3/Payload/
  • http://{BLOCKED}tes.{BLOCKED}soft.com:46769/G3/Payload/
  • http://{BLOCKED}server.{BLOCKED}pdates.eu:46769/G3/Payload/

It saves the files it downloads using the following names:

  • %ProgramData%\Intel. Inc\Bin\{Payload Name}

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Information Theft

This Backdoor gathers the following data:

  • MAC Address
  • Computer Name
  • Username
  • Fingerprint - Generated MD5 hash using the information gathered in the affected system
  • Files with the following extensions in all drives:
    • .ppt
    • pptx
    • .doc
    • .docx
    • .xlx
    • .xlxs
    • .xlsx
    • .pdf

Other Details

This Backdoor adds the following scheduled tasks:

    • Task Name: {Payload Name}
    • Schedule: At logon of affected user
    • Task to be run: %ProgramData%\Intel. Inc\Bin\{Payload Name}

(Note: %ProgramData% is the Program Data folder, where it usually is C:\Program Files in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.224.03

FIRST VSAPI PATTERN DATE:

01 May 2018

VSAPI OPR PATTERN File:

14.225.00

VSAPI OPR PATTERN Date:

02 May 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Identify and terminate files detected as BKDR_GRAVITYRAT.C

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %System%\Tasks\{Payload Name}

Step 5

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %ProgramData%\Intel. Inc

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_GRAVITYRAT.C. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check the following Trend Micro Support pages for more information:


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