Cyber Threat Report: 'Buzzing on Christmas Eve: Trigona Ransomware in 3 Hours'

This report by the DFIR Report outlines a Trigona Ransomware attack. It describes how the actors went from initial access (by exposed RDP) to data exfiltration and deployment of Trigona ransomware in 3 hours. The threat actor used SoftPerfect's Netscan for network discovery activities.

Network Intrusion Prevention

Use intrusion detection signatures to block traffic at network boundaries.

Filter Network Traffic

Use network appliances to filter ingress or egress traffic and perform protocol-based filtering. Configure software on endpoints to filter network traffic.

Restrict Registry Permissions

Restrict the ability to modify certain hives or keys in the Windows Registry.

Restrict Web-Based Content

Restrict use of certain websites, block downloads/attachments, block Javascript, restrict browser extensions, etc.

Execution Prevention

Block execution of code on a system through application control, and/or script blocking.

User Account Management

Manage the creation, modification, use, and permissions associated to user accounts.

Restrict File and Directory Permissions

Restrict access by setting directory and file permissions that are not specific to users or privileged accounts.

Operating System Configuration

Make configuration changes related to the operating system or a common feature of the operating system that result in system hardening against techniques.

Behavior Prevention on Endpoint

Use capabilities to prevent suspicious behavior patterns from occurring on endpoint systems. This could include suspicious process, file, API call, etc. behavior.

Data Backup

Take and store data backups from end user systems and critical servers. Ensure backup and storage systems are hardened and kept separate from the corporate network to prevent compromise.

Limit Access to Resource Over Network

Prevent access to file shares, remote access to systems, unnecessary services. Mechanisms to limit access may include use of network concentrators, RDP gateways, etc.

Privileged Account Management

Manage the creation, modification, use, and permissions associated to privileged accounts, including SYSTEM and root.

Disable or Remove Feature or Program

Remove or deny access to unnecessary and potentially vulnerable software to prevent abuse by adversaries.

Multi-factor Authentication

Use two or more pieces of evidence to authenticate to a system; such as username and password in addition to a token from a physical smart card or token generator.

Network Segmentation

Architect sections of the network to isolate critical systems, functions, or resources. Use physical and logical segmentation to prevent access to potentially sensitive systems and information. Use a DMZ to contain any internet-facing services...

Audit

Perform audits or scans of systems, permissions, insecure software, insecure configurations, etc. to identify potential weaknesses.

Code Signing

Enforce binary and application integrity with digital signature verification to prevent untrusted code from executing.

Antivirus/Antimalware

Use signatures or heuristics to detect malicious software.

Password Policies

Set and enforce secure password policies for accounts.

Application Developer Guidance

This mitigation describes any guidance or training given to developers of applications to avoid introducing security weaknesses that an adversary may be able to take advantage of.

User Training

Train users to be aware of access or manipulation attempts by an adversary to reduce the risk of successful spearphishing, social engineering, and other techniques that involve user interaction.

Active Directory Configuration

Configure Active Directory to prevent use of certain techniques; use SID Filtering, etc.

Account Use Policies

Configure features related to account use like login attempt lockouts, specific login times, etc.