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Trojan.MacOS.SLISP.A

February 23, 2021
 Analysis by: Thea Patrice Tajonera
 ALIASES:

Trojan.OSX.SilverSparrow (IKARUS)

 PLATFORM:

OSX

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

  TECHNICAL DETAILS

File Size:

54403 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

22 Feb 2021

Payload:

Connects to URLs/IPs, Drops files, Steals information

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan adds the following folders:

  • /Users/scbox/Library/Application Support/agent_updater

Dropping Routine

This Trojan drops the following files:

  • ~/Library/LaunchAgents/init_agent.plist -> persistence for agent.sh
  • ~/Library/Application Support/agent_updater/agent.sh -> detected as Trojan.SH.SLISP

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • https://mobiletraits.s3.{BLOCKED}aws.com/version.json

Information Theft

This Trojan gathers the following data:

  • Query String:
    • sqlite3 /Users/scbox/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2 select LSQuarantineDataURLString from LSQuarantineEvent where LSQuarantineDataURLString like \"%stu=3c55805%\" order by LSQuarantineTimeStamp desc

Stolen Information

This Trojan sends the gathered information via HTTP POST to the following URL:

  • http://api.{BLOCKED}traits.com/pkl

Other Details

This Trojan connects to the following possibly malicious URL:

  • mobiletraits.s3.{BLOCKED}aws.com
  • s3-1-w.{BLOKCED}aws.com
  • api.{BLOCKED}traits.com

It does the following:

  • This malware is a pkg file (updater.pkg) that contains malicious pre-install scripts inside the Distribution.xml file -> detected as Trojan.XML.SLISP.A
  • The Distribution.xml file contains javascript codes to run system commands and does the routine:
    • Creates file init_agent.plist
    • Creates file agent.sh
    • Downloads version.plist
    • Run init_agent.plist
    • agent.sh downloads and runs its payload
    • Query Download Data
  • Init_agent.plist calls agent.sh every hour
  • The url that agent.sh downloads is dependent from another downloaded file from https://mobiletraits.s3.{BLOCKED}aws.com/version.json and is stored in /tmp/version.json
  • The .pkg file will also execute the bystander binaries file

  SOLUTION

Minimum Scan Engine:

10.000

FIRST VSAPI PATTERN FILE:

16.557.00

FIRST VSAPI PATTERN DATE:

23 Feb 2021

VSAPI OPR PATTERN File:

16.557.00

VSAPI OPR PATTERN Date:

23 Feb 2021

Scan your computer with your Trend Micro product to delete files detected as Trojan.MacOS.SLISP.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 the following Trend Micro Support pages for more information:


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