Analysis by: Ryan Paolo Maglaque
ALIASES:

TrojanDownloader:JS/Qakbot.P(Microsoft);Trojan-Downloader.JS.Agent.asdgaz(Kaspersky);JS/Pinkslipbot.c(NAI)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan 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 the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 8,026 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 28 Apr 2017
Payload: Downloads files

Arrival Details

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

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://projects.{BLOCKED}omerytech.com/TealeafTarget.php
  • http://n.abcwd0.seed.{BLOCKED}ecureservers.com/TealeafTarget.php
  • http://css.kbaf.{BLOCKED}zen.co.uk/TealeafTarget.php

It saves the files it downloads using the following names:

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.392.08
FIRST VSAPI PATTERN DATE: 08 May 2017
VSAPI OPR PATTERN File: 13.393.00
VSAPI OPR PATTERN Date: 09 May 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

Remove malware/grayware files dropped/downloaded by JS_QAKBOT.SMJ. (Note: Please skip this step if the threats listed below have already been removed.)

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_QAKBOT.SMJ. 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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