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JS_RETEFE.K

July 24, 2017
 Analysis by: John Kevin Sanchez
 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 Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

3,884 bytes

File Type:

JS

Memory Resident:

Yes

Initial Samples Received Date:

23 Jul 2017

Payload:

Connects to URLs/IPs, 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.

Backdoor Routine

This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}.{BLOCKED}.214.12/action2/{hostname and username}
  • http://{BLOCKED}.{BLOCKED}.214.12/response/{hostname and username}/{values}
  • http://{BLOCKED}.{BLOCKED}.214.12/upload/{hostname and username}/{values}
  • http://{BLOCKED}.{BLOCKED}.11.21:8080

Other Details

This Trojan does the following:

  • It is capable of uploading to and downloading files from its C&C server.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.552.01

FIRST VSAPI PATTERN DATE:

23 Jul 2017

VSAPI OPR PATTERN File:

13.553.00

VSAPI OPR PATTERN Date:

24 Jul 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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as JS_RETEFE.K. 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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