Analysis by: Rhena Inocencio
ALIASES:

Linux/Hanthie.A.Gen trojan (Nod32)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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.

  TECHNICAL DETAILS

File Size: 148,516 bytes
File Type: ELF
File Compression: UPX
Memory Resident: Yes
Initial Samples Received Date: 20 Aug 2013
Payload: Compromises system security

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.

Installation

This backdoor drops the following copies of itself into the affected system:

  • ~/.config/.system-firewall/system-firewall.{bot key}.config

Backdoor Routine

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

  • Uninstall itself
  • Download and execute arbitrary files
  • Start remote shell
  • Update itself

NOTES:

It terminates itself if the following items are found:

  • /proc/vz/
  • /proc/bc/
  • /proc/xen/capabilities

It terminates itself if the following strings are found in these files:

VMware or VBOX in /proc/scsi/scsi
PowerVM Lx86, IBM/S390 or QEMU in /proc/cpuinfo
VM, Control Program or LPAR in /proc/sysinfo

It has form grabbing capability to capture web form data on the following browsers:

  • Chrome
  • Chromium
  • Firefox

It can block users to access specific sites.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.232.04
FIRST VSAPI PATTERN DATE: 22 Aug 2013
VSAPI OPR PATTERN File: 10.233.00
VSAPI OPR PATTERN Date: 23 Aug 2013

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