Threat Encyclopedia

TROJ_HWDOOR.B

Publish date: September 14, 2017

Modified by:

Jennifer Gumban

PLATFORM:

Windows

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This malware is associated with the attacks against the word processing application Hangul Word Processor (HWP), which is able to run PostScript code. The attacks do not involve actual exploits, the attackers instead abuse a feature of PostScript.

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.

As of this writing, the said sites are inaccessible.

TECHNICAL DETAILS

File Size:

801,280 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

02 Jul 2017

Payload:

Connects to URLs/IPs

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:

  • {BLOCKED}.{BLOCKED}.199.160
  • {BLOCKED}.{BLOCKED}.170.108
  • {BLOCKED}.{BLOCKED}.153.131

As of this writing, the said sites are inaccessible.

SOLUTION

Minimum Scan Engine:

9.850

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 TROJ_HWDOOR.B. 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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