Author: Christopher Daniel So   
 PLATFORM:

Linux, UNIX, Mac OS X

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL::
 DISTRIBUTION POTENTIAL::
 REPORTED INFECTION:
 INFORMATION EXPOSURE:
Low
Medium
High
Critical

  • Threat Type:
    Backdoor

  • Destructiveness:
    No

  • Encrypted:
    No

  • In the wild::
    Yes

  OVERVIEW

INFECTION CHANNEL: Descargado de Internet

Se conecta a servidores de IRC. Se une a un canal de IRC. Ejecuta comandos desde un usuario remoto malicioso que pone en peligro el sistema afectado.

  TECHNICAL DETAILS

File size: 66,395 bytes
File type: Script
Memory resident: Yes
INITIAL SAMPLES RECEIVED DATE: 01 de февраля de 2011
PAYLOAD: Connects to URLs/IPs

Detalles de entrada

Puede haberse descargado desde los sitios remotos siguientes:

  • http://{BLOCKED}host.us/bots/pl

Rutina de puerta trasera

Se conecta a alguno de los siguientes servidores de IRC:

  • linksys.{BLOCKED}shellz.net:25
  • irc.{BLOCKED}-newbie.org:6667
  • irc.{BLOCKED}thien.net:6667
  • {BLOCKED}2.{BLOCKED}7.181.100:53
  • {BLOCKED}briel.{BLOCKED}u.cc:8080
  • {BLOCKED}7.{BLOCKED}4.250.46:80
  • {BLOCKED}za.{BLOCKED}briel.{BLOCKED}u.cc
  • {BLOCKED}h.rocks
  • irc.{BLOCKED}net.com:6667

Se une a alguno de los canales siguientes de IRC:

  • #shellshock
  • #bug
  • #DNC
  • #w00t
  • #fr2
  • #113
  • #vafe
  • #cabal
  • #scan
  • #exit

Ejecuta los comandos siguientes desde un usuario remoto malicioso:

  • multiscan - Scan sites for multi-scan vulnerabilities
  • socks5 - Set up SOCKSv5 protocol and return an IP address
  • sql2 - Scan for sites with vulnerable SQL server
  • portscan - Scan an IP address for the following ports: 15, 19, 98, 20, 21, 22, 23, 25, 37, 39, 42, 43, 49, 53, 63, 69, 79, 80, 101, 106, 107, 109, 110, 111, 113, 115, 117, 119, 135, 137, 139, 143, 174, 194, 389, 389, 427, 443, 444, 445, 464, 488, 512, 513, 514, 520, 540, 546, 548, 565, 609, 631, 636, 694, 749, 750, 767, 774, 783, 808, 902, 988, 993, 994, 995, 1005, 1025, 1033, 1066, 1079, 1080, 1109, 1433, 1434, 1512, 2049, 2105, 2432, 2583, 3128, 3306, 4321, 5000, 5222, 5223, 5269, 5555, 6660, 6661, 6662, 6663, 6665, 6666, 6667, 6668, 6669, 7000, 7001, 7741, 8000, 8018, 8080, 8200, 10000, 19150, 27374, 31310, 33133, 33733, 55555
  • logcleaner - Deletes all files in the following directories:
    • /var/log/lastlog
    • /var/log/wtmp
    • /etc/wtmp
    • /var/run/utmp
    • /etc/utmp
    • /var/log
    • /var/logs
    • /var/adm
    • /var/apache/log
    • /var/apache/logs
    • /usr/local/apache/log
    • /usr/local/apache/logs
    • /root/.bash_history
    • /root/.ksh_history
  • sendmail - Send an email to a target
  • system - Get OS name and version, system uptime, current process name, user ID, group ID and current directory
  • cleartmp - Delete all files in /tmp
  • rootable - Enumerates possible root exploits in the infected system
  • nmap - Search an IP address for open ports in a specified range
  • back - Execute a remote shell (/bin/sh)
  • packetstorm - Enumerate advisories in http://www.packetstormsecurity.org/whatsnew20.xml
  • milw0rm - Enumerate exploits listed in milw0rm's website
  • udpflood - Perform UDP flooding
  • tcpflood - Perform TCP flooding
  • httpflood - Perform HTTP flooding
  • sqlflood - Perform SQL flooding
  • killme - Disconnect from the IRC server and terminate self
  • join - Join a channel
  • part - Leave a channel
  • reset - Disconnect from the IRC server
  • voice - Grant a user the voice status
  • owner - Grant a user channel ownership
  • deowner - Revoke a user's channel ownership
  • devoice - Revoke a user's voice status
  • halfop - Grant a user the half operator status
  • dehalfop - Revoke a user's half operator status
  • op - Grant a user the operator status
  • deop - Revoke a user's operator status
  • msgflood - Perform private message flooding to a target
  • dccflood - Perform DCC flooding to a target
  • ctcpflood - Perform TCP flooding to a target
  • noticeflood - Perform a NOTICE message flooding to a target
  • channelflood - Join 25 random IRC channels
  • maxiflood - Perform msgflood, ctcpflood and noticeflood simultaneously

  SOLUTION

Minimum scan engine: 9.700
First VSAPI Pattern File: 7.806.11
First VSAPI Pattern Release Date: 01 de февраля de 2011

Reinicie en modo normal y explore el equipo con su producto de Trend Micro para buscar los archivos identificados como PERL_SHELBOT.SMO En caso de que el producto de Trend Micro ya haya limpiado, eliminado o puesto en cuarentena los archivos detectados, no serán necesarios más pasos. Puede optar simplemente por eliminar los archivos en cuarentena. Consulte esta página de Base de conocimientos para obtener más información.


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