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

Canal de infección 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

Tamaño del archivo 64 bytes
Tipo de archivo PHP
Residente en memoria No
Fecha de recepción de las muestras iniciales 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

Motor de exploración mínimo 9.800
Primer archivo de patrones de VSAPI 18.686.04
Primera fecha de publicación de patrones de VSAPI 09 Sep 2023
Versión de patrones OPR de VSAPI 18.687.00
Fecha de publicación de patrones OPR de VSAPI 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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