DESCRIPTION NAME:

RANSOM CRYPCTB DNS Connection detected

 CONFIDENCE LEVEL: HIGH
 SEVERITY INBOUND:
 SEVERITY OUTBOUND:
informational
Low
Medium
High

 OVERVIEW

This is Trend Micro detection for packets passing through DNS network protocols that can be used as Command and Control Communication. This also indicates a malware infection. Below are some indicators of an infected host:

  • Excessive spamming, exploit attempts on hosts inside or outside the network, and denial of service (DoS) attacks on hosts outside the network, which often result in degraded network performance and further propagation of the malware.
  • Creating additional administrative accounts, creating new shared folders, and interfering with the operation of security software, resulting in a weakening of overall network security.
  • Keylogging and stealing of confidential data.
  • Sending massive amounts of unsolicited and sometimes fraudulent, malicious, and illegal email messages that may appear to originate from your domain.

 TECHNICAL DETAILS

Attack Phase: Command and Control Communication

Protocol: DNS

Risk Type: MALWARE

Threat Type: Malicious Behavior

Confidence Level: High

Severity: High(Inbound)

DDI Default Rule Status: Enable

Event Class: Callback

Event Sub Class: DNS

Behavior Indicator: Callback

APT Related: NO

 SOLUTION

Network Content Inspection Pattern Version: 1.13965.00
Network Content Inspection Pattern Release Date: 21 Nov 2019
Network Content Correlation Pattern Version: 1.12369.00
Network Content Correlation Pattern Release Date: 10 Sep 2015

Immediate Action

  • Update your Trend Micro products and pattern files to the latest version.
  • Scan the host exhibiting this type of network behavior to clean any detected items.

Secondary Action

If scanning fails to detect a malware infection:

  1. If possible, disconnect the host from the network to prevent any further communication or malicious activities the malware may attempt.
  2. Run RootkitBuster to check through hidden files, registry entries, processes, drivers, and hooked system services.
  3. Use the Anti-Threat Toolkit (ATTK) tools to collect undetected malware information.
  4. Identify and clean threats with Rescue Disk, specific to suspected threats that are persistent or difficult-to-clean. Rescue Disk allows you to use a CD, DVD, or USB drive to examine your computer without launching Microsoft Windows.


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