| name | conducting-malware-incident-response |
| description | Responds to malware infections across enterprise endpoints by identifying the malware family, determining infection vectors, assessing spread, and executing eradication procedures. Covers the full lifecycle from detection through containment, analysis, removal, and recovery. Activates for requests involving malware response, malware eradication, trojan removal, worm containment, malware triage, or infected endpoint remediation.
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| domain | cybersecurity |
| subdomain | incident-response |
| tags | ["malware-response","malware-analysis","eradication","endpoint-remediation","MITRE-ATT&CK"] |
| version | 1.0.0 |
| author | mahipal |
| license | Apache-2.0 |
Conducting Malware Incident Response
When to Use
- EDR or antivirus detects malware execution on one or more endpoints
- A user reports suspicious system behavior indicative of malware infection
- Threat intelligence indicates a malware campaign targeting the organization's industry
- Network monitoring detects beaconing traffic consistent with known malware C2 patterns
- A file detonation in a sandbox returns a malicious verdict
Do not use for analyzing malware samples in a research context; use dedicated malware analysis procedures for reverse engineering.
Prerequisites
- EDR platform with process tree visibility and host isolation capability
- Malware sandbox environment (Cuckoo, ANY.RUN, Joe Sandbox, Hybrid Analysis)
- Access to threat intelligence platforms for malware family identification (VirusTotal, MalwareBazaar)
- Forensic imaging tools for evidence preservation (FTK Imager, KAPE)
- Clean system images or gold images for endpoint rebuild
- MITRE ATT&CK framework reference for technique mapping
Workflow
Step 1: Detect and Confirm Malware Presence
Validate the malware alert and gather initial indicators:
- Review EDR alert details: detection name, file path, hash (SHA-256), process tree
- Check if the detection is a known malware family or generic heuristic detection
- Query the file hash against VirusTotal, MalwareBazaar, and internal threat intelligence
- Examine the process execution chain to determine how the malware was delivered
Detection Summary:
File: C:\Users\jsmith\AppData\Local\Temp\update.exe
SHA-256: a1b2c3d4e5f6...
Detection: CrowdStrike: Malware/Qakbot | VirusTotal: 58/72 engines
Parent: WINWORD.EXE → cmd.exe → powershell.exe → update.exe
Delivery: Email attachment (Invoice-Nov2025.docm)
Network: HTTPS POST to 185.220.101[.]42:443 every 60s
Persistence: Scheduled Task "WindowsUpdate" → update.exe
Step 2: Scope the Infection
Determine how many systems are affected and the malware's propagation method:
- Use EDR to search for the malware hash, filename, and behavioral indicators across all endpoints
- Check for network-based spreading (SMB, WMI, PsExec, exploitation)
- Query email gateway logs for all recipients of the delivery email
- Search for C2 communications to the identified infrastructure from other internal hosts
- Check for persistence mechanisms on all identified infected hosts
Step 3: Contain Infected Systems
Execute containment per the active breach containment procedures:
