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Backdoor.Win32.FARFLI.RFI

June 01, 2020
 Analysis by: Clive Fuentebella
 ALIASES:

a variant of Win32/Farfli.AWK trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It gathers certain information on the affected computer.

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

  TECHNICAL DETAILS

File Size:

182,272 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

29 May 2020

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

This Backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Propagation

This Backdoor does not have any propagation routine.

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Information Theft

This Backdoor gathers the following information on the affected computer:

  • Username
  • Computer name
  • Account name
  • Account privilege
  • System architecture
  • Processor name
  • OS version
  • Malware file name
  • Shutdown time
  • Boot time
  • Local drive volume information

Other Details

This Backdoor does the following:

  • It connects to the following C&C servers to download and execute arbitrary code:
    • orion.{BLOCKED}nc.com:443
    • {BLOCKED}.{BLOCKED}.92.110:443
  • It executes the following backdoor commands:
    • Update gathered information
    • Enumerate files
    • Read files
    • Write into files
    • Upload files
    • Create/Delete files
    • Copy/Move files
    • Create/Delete folder
    • Create/Terminate process
    • Create/Terminate pipe
    • Execute arbitrary code

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

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.900.01

FIRST VSAPI PATTERN DATE:

29 May 2020

VSAPI OPR PATTERN File:

15.901.00

VSAPI OPR PATTERN Date:

30 May 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.Win32.TRX.XXPE50FFF035

Step 2

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.FARFLI.RFI. 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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