Analysis by: Jemimah Mae Molina
ALIASES:

Linux/Dofloo.iataq (ANTIVIR); ELF:Flooder-PI [Trj] (AVAST)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

It executes commands from a remote malicious user, effectively compromising the affected system.

It retrieves specific information from the affected system.

  TECHNICAL DETAILS

File Size: 2,704,064 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 12 Apr 2019
Payload: Launches DoS/DDoS attacks, 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 executes the following commands from a remote malicious user:

  • Execute shell commands
  • Perform the following types of DDoS attacks:
    • SYN
    • LSYN
    • UDP
    • UDPS
    • TCP
    • CC
    • CC2
    • CC3

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.59.34:48080

Information Theft

This Backdoor retrieves the following information from the affected system:

  • CPU Description
  • CPU Speed
  • Processor Family
  • Model
  • CPU Type
  • Model ID

Other Details

This Backdoor does the following:

  • It modifies the following files as an autostart technique:
    • /etc/rc.local
    • /etc/rc.d/rc.local
    by appending the following command:
    • {malware path}/{malware file name} reboot

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.934.04
FIRST VSAPI PATTERN DATE: 12 Apr 2019
VSAPI OPR PATTERN File: 14.935.00
VSAPI OPR PATTERN Date: 13 Apr 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.AESDDOS.J. 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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