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SWF_EXPLOYT.KORPF

February 06, 2018
 Analysis by: Rheniel Rhay Ramos
 ALIASES:

Exploit-CVE2018-4878.b (McAfee); Script.SWF.C609 (Bitdefender);

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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 exploits a vulnerability identified as in a zero-day attack. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

116,887 bytes

File Type:

SWF

Memory Resident:

No

Initial Samples Received Date:

05 Feb 2018

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.

Other Details

This Trojan exploits a zero-day vulnerability. More information on the said vulnerability can be found in the following pages:

  • CVE-2018-4878

It does the following:

  • Upon execution, this Trojan downloads and executes a shellcode from the following URL and executes it:
    • http://www.{BLOCKED}ler.co.kr/admincenter/files/boad/4/manager.php

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

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.948.05

FIRST VSAPI PATTERN DATE:

05 Feb 2018

VSAPI OPR PATTERN File:

13.949.00

VSAPI OPR PATTERN Date:

06 Feb 2018

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 SWF_EXPLOYT.KORPF. 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 the following Trend Micro Support pages for more information:


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