UNIX_SMALL.NTT

January 26, 2015
 Analysis by: RonJay Kristoffer Caragay
 ALIASES:

Flooder.Linux.Small.y (Kaspersky); Linux/Flooder.Small.NAA (ESET-NOD32); Flooder.Linux.Small (Ikarus); Linux/IRCBot (McAfee);

 PLATFORM:

Linux/Unix

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

It does not have any information-stealing capability.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size:

8,922 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

20 Jan 2015

Arrival Details

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan requires its main component to successfully perform its intended routine.

NOTES:

It accepts the following parameters:

  • {IP address} {hosts} {number}
    • IP address = IP address of target victim
    • hosts = a file containing list of reflector servers
    • number = number of loops

This Trojan is used to perform Reflective DDOS (Distributed Denial Of Service) to a target IP.

It sends SYN packets with a spoofed source IP (target victim's IP) to the reflector servers.

All of the reflector servers will reply with SYN/ACK packets to the target victim.

Due to large number of replies, the target victim's bandwidth gets flooded (TCP SYN Flooding).

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.586.05

FIRST VSAPI PATTERN DATE:

05 Feb 2014

VSAPI OPR PATTERN File:

10.587.00

VSAPI OPR PATTERN Date:

05 Feb 2014

Scan your computer with your Trend Micro product to delete files detected as UNIX_SMALL.NTT. 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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