Backdoor.PHP.WEBSHELL.SBJSRMUAN

September 15, 2023
 Analysis by: John Rainier Navato
 ALIASES:

Generic.WebShell.Z.B5F99246 (BITDEFENDER)

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

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

64 bytes

File Type:

PHP

Memory Resident:

No

Initial Samples Received Date:

30 Aug 2023

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.

Backdoor Routine

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

  • Execute arbitrary code

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 receive codes from the attacker via POST command on this hosted php file with the variable "lLPnsxVsDgj8".

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:

18.686.04

FIRST VSAPI PATTERN DATE:

09 Sep 2023

VSAPI OPR PATTERN File:

18.687.00

VSAPI OPR PATTERN Date:

10 Sep 2023

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.PHP.WEBSHELL.SBJSRMUAN. 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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