Analysis by: John Rainier Navato
ALIASES:

Java/webshell.E234!tr (FORTINET)

 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, Dropped by other malware

This Backdoor does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 372 bytes
File Type: Java
Memory Resident: No
Initial Samples Received Date: 02 Feb 2024
Payload: Executes commands

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Execute Arbitrary Commands

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Information Theft

This Backdoor does not have any information-stealing capability.

Other Details

This Backdoor does the following:

  • It receives code passed through request parameter name "i"

It does not exploit any vulnerability.

It requires being hosted on a web server in order to proceed with its intended routine.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.134.04
FIRST VSAPI PATTERN DATE: 02 Feb 2024
VSAPI OPR PATTERN File: 19.135.00
VSAPI OPR PATTERN Date: 03 Feb 2024

Step 1

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 2

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Java.WEBSHELL.SBJKWF. 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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