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Threat Encyclopedia

ELF_SSHDOOR.A

ANALYSIS BY

Mark Joseph Manahan


ALIASES:

Troj/SSHDoor-D (Sophos), Linux/SSHDoor.A trojan (Eset)

PLATFORM:

Linux

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

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


This malware targets systems running on Linux. It allows remote access of affected systems through the use of SSH (Secure Shell Protocol) and steals system login credentials. Users with affected systems may have their systems' security compromised.

To get a one-glance comprehensive view of the behavior of this Backdoor, refer to the Threat Diagram shown below.

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 connects to a website to send and receive information.

TECHNICAL DETAILS

File Size:

481,200 bytes

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

25 Jan 2013

Payload:

Compromises system security, Steals information

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:

  • Remote Access
  • Steals Username/Password

It connects to the following websites to send and receive information:

  • {BLOCKED}h.info
  • {BLOCKED}pository.org

Information Theft

This backdoor gathers the following data:

  • Hostname
  • Ip Address
  • Open Port

SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.680.04

FIRST VSAPI PATTERN DATE:

25 Jan 2013

VSAPI OPR PATTERN File:

9.681.00

VSAPI OPR PATTERN Date:

26 Jan 2013

Scan your computer with your Trend Micro product to delete files detected as ELF_SSHDOOR.A. 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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