Analysis by: Mohammed Malubay
ALIASES:

a variant of Win64/Spy.Zbot.Q trojan(NOD32);

 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 does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  TECHNICAL DETAILS

File Size: 279,525 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 28 Sep 2020
Payload: Connects to URLs/IPs, Downloads files, Executes files, Steals information

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.

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

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

  • Download and execute file
  • Upload file
  • Get passwords
  • Get/remove cookies
  • Block/unblock URLs
  • Start/stop VNC server

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}st2020.com/LKhwojehDgwegSDG/gateJKjdsh.php
  • http://{BLOCKED}st2020.in/LKhwojehDgwegSDG/gateJKjdsh.php
  • http://{BLOCKED}st2020.info/LKhwojehDgwegSDG/gateJKjdsh.php
  • http://{BLOCKED}st2020.net/LKhwojehDgwegSDG/gateJKjdsh.php
  • http://{BLOCKED}st2020.org/LKhwojehDgwegSDG/gateJKjdsh.php

However, as of this writing, the said sites are inaccessible.

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Other Details

This Backdoor does not exploit any vulnerability.

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.262.03
FIRST VSAPI PATTERN DATE: 02 Oct 2020
VSAPI OPR PATTERN File: 16.263.00
VSAPI OPR PATTERN Date: 03 Oct 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

  • Troj.Win32.TRX.XXPE50FFF036

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.ZBOT.ENM. 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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