Backdoor.Perl.SHELLBOT.AD

March 20, 2020
 Analysis by: Elton Rondero
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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.

  TECHNICAL DETAILS

File Size:

46,817 bytes

File Type:

PL

Memory Resident:

Yes

Initial Samples Received Date:

04 Feb 2020

Payload:

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.

Backdoor Routine

This Backdoor connects to any of the following IRC server(s):

  • {BLOCKED}.{BLOCKED}.226.207:3210

    It joins any of the following IRC channel(s):

    • #z

    It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:

    • die - terminates itself
    • mail - sends mail to a target
    • cback - Execute a remote shell (/bin/sh or cmd.exe)
    • dns - Resolve an address to its IP address
    • port - Open a connection to a specified IP address and port
    • IRC Control:
      • join - join a specified channel
      • part - leave a specified channel
      • rejoin - leave then rejoin a specified channel
      • op - grant a user an operator status
      • deop - revoke a user's operator status
      • voice - grant a user a voice status
      • devoice - revoke a user's voice status
      • msg - send a private message
      • flood - send a private message for a specified number of times
      • ctcpflood - send a client-to-client protocol request to a specified user or channel for a specified number of times
      • ctcp - send a client-to-client protocol request to a specified user or channel
      • invite - invite a user to join a specified channel
      • nick - change nickname
      • conecta - connect to a specified server
      • send - establish a direct connection with another user
      • raw - toggles raw events processing
      • eval - execute specified command
      • quit - disconnect from server
    • portscan - Scans an IP address for the following ports:
    • 1, 7, 9, 14, 20, 21, 22, 23, 25, 53, 80, 88, 110, 112, 113, 137, 143, 145, 222, 333, 405, 443, 444, 445, 512, 587, 616, 666, 993, 995, 1024, 1025, 1080, 1144, 1156, 1222, 1230, 1337, 1348, 1628, 1641, 1720, 1723, 1763, 1983, 1984, 1985, 1987, 1988, 1990, 1994, 2005, 2020, 2121, 2200, 2222, 2223, 2345, 2360, 2500, 2727, 3130, 3128, 3137, 3129, 3303, 3306, 3333, 3389, 4000, 4001, 4471, 4877, 5252, 5522, 5553, 5554, 5642, 5777, 5800, 5801, 5900, 5901, 6062, 6550, 6522, 6600, 6622, 6662, 6665, 6666, 6667, 6969, 7000, 7979, 8008, 8080, 8081, 8082, 8181, 8246, 8443, 8520, 8787, 8855, 8880, 8989, 9855, 9865, 9997, 9999, 10000, 10001, 10010, 10222, 11170, 11306, 11444, 12241, 12312, 14534, 14568, 15951, 17272, 19635, 19906, 19900, 20000, 21412, 21443, 21205, 22022, 30999, 31336, 31337, 32768, 33180, 35651, 36666, 37998, 41114, 41215, 44544, 45055, 45555, 45678, 51114, 51247, 51234, 55066, 55555, 65114, 65156, 65120, 65410, 65500, 65501, 65523, 65533
    • Download a file
    • Scan open ports of a specific hostname
    • UDP Flooding
    • Connect to an arbitrary socket
    • Simultaneous IGMP, ICMP, UDP, TCP, HTTP flooding on open ports

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.726.02

FIRST VSAPI PATTERN DATE:

06 Mar 2020

VSAPI OPR PATTERN File:

15.727.00

VSAPI OPR PATTERN Date:

07 Mar 2020

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Perl.SHELLBOT.AD. 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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