Subject: Tropic Trooper – Spear Phishing Attachment
Tactics: TA0003 Persistence
Technique: T1566.001 Phishing: Spearphishing Attachment
Procedure:
Tropic Trooper crafts spearphishing emails with malicious attachments, often disguised as legitimate documents or files, to target individuals within their desired organizations. These attachments typically contain malware, such as the “Yahoyah” downloader, which enables them to establish persistence on compromised systems.
Vulnerability: EAV0001 When adversaries interact with the environment or personas, they are vulnerable when they collect, observe, or manipulate system artifacts or information. Manipulated data may cause them to reveal behaviors, use additional or more advanced capabilities against the target, and/or impact their dwell time.
Engagement Opportunity:
Implement a “Reverse Spearphishing” campaign. This involves sending carefully crafted emails to known or suspected Tropic Trooper operatives, enticing them to interact with controlled attachments or links. This can lead them to decoy systems, allowing for further engagement and intelligence gathering.
Threat Actor: Tropic Trooper (APT23)
Threat Objective:
Maintaining long-term access to compromised networks for espionage and data exfiltration.
Deception Opportunity:
Develop a deceptive network environment that appears to contain valuable information but is isolated and monitored. This can deceive Tropic Trooper into believing they have successfully established persistence while defenders observe their activities and gather intelligence.
Sensor Data Placement: User-Mode
Observable Level: Core to Adversary-Brought Tool
Scoring Rationale:
The analysis focuses on the specific malware and attachments used in Tropic Trooper’s spearphishing campaigns. These observables are core to their current toolset but may evolve over time.
Link to Report: https://www.google.com/url?sa=E&source=gmail&q=https://socradar.io/dark-web-profile-tropic-trooper-apt23/
Link to Report II.:
Additional Comments:
User awareness training and robust email security solutions are crucial for mitigating the risk of spearphishing attacks. Combining these preventative measures with proactive engagement strategies can further enhance an organization’s defenses against Tropic Trooper.
Possible elements:
MSG (Pseudocode):