PERL_SHELLBOT.VTK

April 29, 2017

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 Analysis by: Cris Nowell Pantanilla

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 ALIASES:

Backdoor.Perl.Shellbot.B (BITDEFENDER)

 PLATFORM:

Windows

 OVERALL RISK RATING:

 DAMAGE POTENTIAL:

 REPORTED INFECTION:

 SYSTEM IMPACT RATING:

 INFORMATION EXPOSURE:

• 
  Threat Type: Backdoor
• 
  Destructiveness: No
• 
  Encrypted: No
• 
  In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size:

9,868 bytes

File Type:

Script

Memory Resident:

No

Initial Samples Received Date:

11 Apr 2017

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.

Other Details

This Backdoor connects to the following possibly malicious URL:

• {BLOCKED}.{BLOCKED}.30.11

It does the following:

• Connect to IRC server.
• Download files.
• Receive commands from remote user.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.354.06

FIRST VSAPI PATTERN DATE:

21 Apr 2017

VSAPI OPR PATTERN File:

13.355.00

VSAPI OPR PATTERN Date:

22 Apr 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

Scan your computer with your Trend Micro product to delete files detected as PERL_SHELLBOT.VTK. 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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