Analysis by: Jaime Benigno Reyes
ALIASES:

Trojan:Win32/Miuref.F (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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 modifies the Internet Explorer Zone Settings.

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

  TECHNICAL DETAILS

File Size: 166,168 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 25 Mar 2015

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.

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.112.229

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

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.560.05
FIRST VSAPI PATTERN DATE: 25 Mar 2015
VSAPI OPR PATTERN File: 11.561.00
VSAPI OPR PATTERN Date: 26 Mar 2015

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 and note files detected as TROJ_MIUREF.JJMS

Step 3

Reset Internet security settings

[ Learn More ]

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MIUREF.JJMS. 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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