Analysis by: Janus Agcaoili
ALIASES:

ASP:Rootkit-C (AVAST); Backdoor.ASP.Rootkit.10.a (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Canal de infección Downloaded from the Internet, Dropped by other malware, Hosted on a website

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 may be hosted on a website and run when a user accesses the said website.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

Tamaño del archivo 956 bytes
Tipo de archivo ASP
Fecha de recepción de las muestras iniciales 07 Mar 2019
Carga útil Connects to URLs/IPs

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.

It may be hosted on a website and run when a user accesses the said website.

Backdoor Routine

This Backdoor executes the following command(s) from a remote malicious user:

  • Execute Arbitrary Codes

Other Details

This Backdoor does the following:

  • It receive codes from the attacker via GET command on this hosted ASP file
  • Displays the following when accessed:

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

  SOLUTION

Motor de exploración mínimo 9.850
Primer archivo de patrones de VSAPI 14.870.05
Primera fecha de publicación de patrones de VSAPI 14 Mar 2019
Versión de patrones OPR de VSAPI 14.871.00
Fecha de publicación de patrones OPR de VSAPI 15 Mar 2019

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.ASP.WEBSHELL.AX. 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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