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Rewterz Threat Alert – APT27 ZxShell RootKit – IOC’s

Severity

High

Analysis Summary

RootKit module of ZxShell RAT used by Emissary Panda (APT27), of which there is a relatively recent sample.

Captura-de-pantalla-de-2020-01-13-11-32-47.png

This rootkit is a very simple, it does not employ any uber fancy methods or something. The name of the driver is “autochk.sys” – that’s why we’ll call it the autochk rootkit. 

Captura-de-pantalla-de-2020-01-13-11-39-50_arrows-1024x435.png

The rootkit implements 2 functionalities:

  • File Redirection – Redirect malicious files to benign files. If you try to call CreateFile() to open a malicious file you’ll get a handle to a benign file.
  • Network Connection Hiding – Hide network connections from tools like netstat.

Impact

Access to sensitive information

Indicators of Compromise

MD5

  • 96fb28626f2db5e378cf48960230f712
  • 956c44a4ec1ba56c75cb4558ed3a653e

SHA-256

  • 42eab05c611bf24d86bb6c985caa2ad7380ed7d98340c7f08de9361be14dc244
  • 9b7c1e37d5f56cc0b5e5e22ce9805e237a189297e78405b9c392a0953b6e0321

SHA1

  • c602290cb2cd1d2ca5c9c8571868495fe7518d9c
  • ce52808fbf36a1f08c80c313c689115212459717

Remediation

  • Block all threat indicators at your respective controls.
  • Always be suspicious about emails sent by unknown senders.
  • Never click on the links/attachments sent by unknown senders.