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BKDR_REKTOR.A

August 03, 2017
 Analysis by: Cris Nowell Pantanilla
 ALIASES:

Trojan-Spy.Win32.Zbot.yhna (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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

  TECHNICAL DETAILS

File Size:

148,480 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Jul 2017

Payload:

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 adds the following processes:

  • explorer.exe

It injects codes into the following process(es):

  • explorer.exe

Backdoor Routine

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

  • http://{BLOCKED}nlittor.com/bdl/gate.php
  • http://{BLOCKED}lerow.com/bdl/gate.php

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

Other Details

This Backdoor does the following:

  • It may connect to the following OpenNIC DNS servers:
    • 185.121.177.53
    • 185.121.177.177
    • 45.63.25.55
    • 111.67.16.202
    • 142.4.204.111
    • 142.4.205.47
    • 31.3.135.232
    • 62.113.203.55
    • 37.228.151.133
    • 144.76.133.38

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.552.08

FIRST VSAPI PATTERN DATE:

24 Jul 2017

VSAPI OPR PATTERN File:

13.553.00

VSAPI OPR PATTERN Date:

25 Jul 2017

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

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_REKTOR.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 this Knowledge Base page for more information.


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