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ELF_SSHDOOR.A
Aliases: Troj/SSHDoor-D (Sophos), Linux/SSHDoor.A trojan (Eset)
Malware type: Backdoor
Destructive: No
Platform: Linux
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 Release Date: 25 Jan 2013
VSAPI OPR Pattern Version: 9.681.00
VSAPI OPR Pattern Release 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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Analysis By: Mark Joseph Manahan

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