Backdoor.Win32.EXSEEG.A

November 30, 2018
 Analysis by: John Donnie Celestre
 Modified by: Noel Anthony Llimos
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

108,050 bytes

File Type:

PS1

Memory Resident:

Yes

Initial Samples Received Date:

26 Nov 2018

Payload:

Steals information, Connects to URLs/IPs, Terminates processes, Logs keystrokes, Executes files, Others

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.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Connect and Disconnect to C&C Server
  • Perform request of specific files from the C&C Server
  • Execute commands or codes
  • Execute files
  • Check registries of interest from C&C Server
  • Capture Screenshots
  • Log Keystrokes
  • Upload files to C&C Server
  • Unzip downloaded file
  • Download Files
  • Compress a file
  • Download file that is compressed
  • Stop/Kill Keyboard
  • Stop Downloads from the C&C Server
  • Terminate a Process
  • Process Injection
  • Delete Files
  • Rename Files
  • Delete Registry entries
  • Create and Rename Registry Entries
  • Create New Directory/Folders
  • Delay Request Time/Response from C&C Server
  • Modify Browser User Agent
  • Check if a process is still alive/running (Probably a downloaded file from the C&C Server)

It connects to the following websites to send and receive information:

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.230

Information Theft

This Backdoor gathers the following data:

  • Computer Name
  • Username
  • Current User
  • OS Version
  • OS Language
  • OS Architecture
  • Last Boot Up Time
  • Country Code

Other Details

This Backdoor deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.650.05

FIRST VSAPI PATTERN DATE:

26 Nov 2018

VSAPI OPR PATTERN File:

14.651.00

VSAPI OPR PATTERN Date:

27 Nov 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

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.EXSEEG.A. 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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