Overview — 10 concise points
1) Delivery: Phishing, malicious ads, and compromised installers deliver trojans to targets.
2) Execution: The payload executes and attempts to evade detection via obfuscation or packing.
3) Persistence: Autostart entries, scheduled tasks, and service creation enable long-term access.
4) Privilege escalation: Exploits or credential theft increase permissions to access sensitive areas.
5) Lateral movement: Tools and scripts are used to move across hosts and expand control.
6) C2 communication: Encrypted channels or cloud services are abused for command-control.
7) Data collection: Keylogging, screenshots, and file gathering are common capabilities.
8) Covering tracks: Log tampering and timestomping hide traces of activity.
9) Secondary payloads: Trojans frequently drop more tooling, including ransomware or miners.
10) Detection & response: Telemetry, EDR, and proactive hunting are central to identifying trojan activity.
Points explained
- Delivery: Attackers often exploit trust — fake installers, repackaged applications, or malicious macros are typical vectors. User education and secure distribution checks reduce success rates.
- Execution: Packed or obfuscated binaries evade signature-based detection; heuristic and behavioral monitoring helps reveal execution anomalies.
- Persistence: Common persistence includes registry Run keys, scheduled tasks, and services; monitoring changes to these locations helps detect early compromise.
- Privilege escalation: Local exploits or credential re-use let attackers escalate privileges; limiting local admin rights reduces impact.
- Lateral movement: Use of SMB, remote admin tools, and credential reuse fuels lateral spread; network segmentation and strong authentication help contain it.
- C2 communication: Monitoring for anomalous outbound connections, especially to new or uncommon domains, can reveal hidden C2 channels.
- Data collection: Trojans may exfiltrate keystrokes or files; EDR file-access telemetry and DLP can detect abnormal exfiltration patterns.
- Covering tracks: Attackers sometimes delete logs or alter timestamps — retaining immutable logs and centralized collection reduces this risk.
- Secondary payloads: Trojans are frequently used as a first stage to deploy additional malware; detecting the initial trojan can prevent worse outcomes.
- Detection & response: Combine EDR alerts, network telemetry, and threat intelligence to detect activity early and speed remediation.