Backdoor.Linux.XORDDOS.D

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Ejecuta comandos desde un usuario remoto malicioso que pone en peligro el sistema afectado.

Detalles de entrada

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Instalación

Crea las siguientes copias de sí mismo en el sistema afectado:

• /usr/bin/{random characters}
• /lib/libudev.so
• /tmp/{random characters}
• /bin/{random characters}

Técnica de inicio automático

Infiltra los archivos siguientes:

• /etc/cron.hourly/gcc.sh (Cron is a time-based job scheduler in Unix-like computer operating systems)

Rutina de puerta trasera

Ejecuta los comandos siguientes desde un usuario remoto malicioso:

• Execute files
• Download files
• Update Malware
• Delete Files
• Terminate Process
• Remove Services
• Remove Self
• Perform DDoS attack
• Hide Files
• Create Services
• Create Directory
• Hide Port
• Copy Files

Publica la siguiente información en su servidor de mando y control (C&C):

• {BLOCKED}.{BLOCKED}.101.37:3306
• cdn.{BLOCKED}2cdn.com
• cdn.{BLOCKED}1num.com
• aa.f{BLOCKED}num.org/config.rar

Robo de información

Recopila los siguientes datos:

• Memory Information
• CPU Information
• Network Speed
• PID of Running Process
• MD5 of Running Process

Otros detalles

Hace lo siguiente:

• Drops a shell script in /etc/init.d/{random character} folder which setups the auto-start mechanism of the malware.
• Creates symbolic links which points to the script in /etc/init.d/{random character}:
  • /etc/rc{1-5}.d/S90{random numbers}
  • /etc/rc.d/rc{1-5}.d/S90{random numbers}
• Read the following from its configuration file:
  • md5 - checksum of file
  • denyip - open communication with an IP
  • filename - list of filename
  • rmfile - files to remove
• Uses the following User Agents:
  • POST/GET %s HTTP/1.1 /
    Accept: */*
    Accept-Language: zh-cn
    User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; TencentTraveler ;.NET CLR 1.1.4322)
    Connection: Keep-Alive
    Host:
    Content-Type: application/x-www-form-urlencoded
    Content-Length:
• Get the magic string value from the file /var/run/gcc.pid
• It modify /bin/chkconfig to add its copy as a service.