PERL_SHELBOT.SMA
Perl/Shellbot (McAfee), Mal/PerlBot-A (Sophos)
Windows, Linux, Unix

Threat Type: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This malware figures in a Shellshock-related SMTP attack.
To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

This backdoor executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
Arrival Details
This backdoor may be downloaded from the following remote site(s):
- http://{BLOCKED}x.com/shock/cgi
Backdoor Routine
This backdoor connects to any of the following IRC server(s):
- {BLOCKED}2.{BLOCKED}3.210.216:23
- irc.{BLOCKED}k.tk:6667
- {BLOCKED}.{BLOCKED}.50.237:6969
It joins any of the following IRC channel(s):
- #apache
- #xrt
It executes the following commands from a remote malicious user:
- system - Get OS name and version, system uptime, current process name, user ID, group ID and current directory
- 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
- tcpflood - Perform TCP flooding
- httpflood - Perform HTTP flooding
- sqlflood - Perform SQL flooding
- udpflood - Perform UDP flooding
- 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
- rootable - Enumerates possible root exploits in the infected system
- socks5 - Set up SOCKSv5 protocol
- sendmail - Send an email to a target
SOLUTION
Scan your computer with your Trend Micro product to delete files detected as PERL_SHELBOT.SMA. 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 this Knowledge Base page for more information.
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