Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows, Linux

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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: 3,643 bytes
File Type: Script
Memory Resident: No
Initial Samples Received Date: 14 Apr 2017

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.

Process Termination

This Trojan terminates the following services if found on the affected system:

  • service iptables
  • SuSEfirewall2
  • reSuSEfirewall2

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}.145.158/libcrypto.so.6
  • http://{BLOCKED}.{BLOCKED}.145.158/libcurl.so.4
  • http://{BLOCKED}.{BLOCKED}.145.158/liblber-2.3.so.0
  • http://{BLOCKED}.{BLOCKED}.145.158/libldap-2.3.so.0
  • http://{BLOCKED}.{BLOCKED}.145.158/libssl.so.6
  • http://{BLOCKED}.{BLOCKED}.63.20/.mail
  • http://{BLOCKED}.{BLOCKED}.63.20/a
  • http://{BLOCKED}.{BLOCKED}.63.20/apacheaes
  • http://{BLOCKED}.{BLOCKED}.63.20/httpd.conf

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: 13.340.05
FIRST VSAPI PATTERN DATE: 14 Apr 2017
VSAPI OPR PATTERN File: 13.341.00
VSAPI OPR PATTERN Date: 15 Apr 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

Scan your computer with your Trend Micro product to delete files detected as PERL_DLOADER.GQB. 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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