Have we seen this before?
Indicators from your alert compared with public reporting, so the team knows the playbook it is facing.
OSINT for Incident Response
OSINT incident response support answers the questions your forensic team cannot see from inside the network: what the attacker is running elsewhere, whether your data or access is being offered, and who is already talking about the incident. We work to your incident lead's priorities and rules, from the first call to the lessons-learned review.
- Answers in hours, not weeks
- Quiet collection that does not tip off attackers
- Findings labeled with TLP
- Retainer agreed before you need it
Short answer
OSINT incident response is open-source intelligence work run alongside forensics during a cyber incident. It checks attacker infrastructure and campaign context, verifies leak claims, watches criminal channels and public discussion, and reports to the incident lead in short, labeled updates. It does not touch your systems or the attacker's; it explains the outside view so containment, communication and recovery decisions rest on facts.
Where OSINT Fits in the Incident Response Life Cycle
NIST now frames incident response through the CSF 2.0 Functions. Outside-in intelligence feeds the Detect, Respond and Recover stages and the lessons learned afterward.
NIST SP 800-61 Rev. 3 maps incident response to the six CSF 2.0 Functions: Govern, Identify and Protect cover preparation, while Detect, Respond and Recover cover the incident itself. Two of its outcomes describe this work directly: "Cyber threat intelligence and other contextual information are integrated into the analysis" (DE.AE-07) and "Information is shared with designated internal and external stakeholders" (RS.CO-03). The publication also notes that third parties may be contracted to help perform incident response (NIST SP 800-61r3).
| Stage | Question from the incident lead | OSINT output |
|---|---|---|
| Detect | Is this alert part of a known campaign? | Campaign and kit context, related indicators, likely next steps |
| Respond | How big is this outside our network? Is anything published? | Infrastructure scope, leak-site and channel checks, claim verification |
| Respond: communication | Who is talking about us, and what are they saying? | Summary of researcher, media and criminal-channel discussion for comms and counsel |
| Recover | Is the attacker coming back or selling our access? | Watch on new infrastructure, access offers and credential dumps |
| Improve | What should change before the next one? | External exposure that helped the attacker, written up for the lessons-learned review |
The First 72 Hours: Outside-In Questions
Six questions most incident leads ask in the first three days. Each one has an open-source answer that does not wait for forensic imaging.
Has anyone claimed it?
Leak sites, forums and channels checked for your name, sample files or an access sale.
Data breach investigations →How did they get in?
Exposed services, leaked staff credentials and look-alike domains that match the forensic timeline.
Who else is hit?
Other victims of the same campaign, which helps size the threat and coordinate with peers or your ISAC.
What is public?
Researcher posts, journalists' questions and social media chatter, so statements are not overtaken by events.
Who is behind it?
Known group, alias or toolset, with a confidence level.
Threat actor profiling →OSINT Operational Security During a Live Incident
Collection must not alert the attacker or leak the incident. Findings are labeled so everyone knows how far they may travel.
- Quiet collection. Lookups on attacker infrastructure run from separate, non-attributable environments, never from your corporate network or named accounts.
- No public uploads. We do not upload your malware samples, documents or ransom notes to public scanning services without the incident lead's approval, because submissions can be visible to other users of those services.
- No contact. We do not message the attackers, post in their channels or reply to journalists. Communication stays with you, counsel and any negotiator you appoint.
- Labeled findings. Every update carries a Traffic Light Protocol label. TLP 2.0, in force since August 2022, runs from TLP:RED, for named recipients only, through TLP:AMBER+STRICT, limited to your organization, to TLP:CLEAR for public release (FIRST TLP).
Setting Up an Incident Response Retainer
Agree the paperwork and the seed data in a quiet week, so collection can start within hours of a call.
- Agree terms in advanceNDA, scope, who may activate the retainer and whether counsel instructs us, all signed before an incident.
- Share the baselineDomains, brands, executives, key suppliers and technology stack, so searches start from known assets.
- Fix the channelsOne contact on each side, an out-of-band channel in case email is compromised and an update rhythm.
- Run a tabletopA short exercise with your incident team to test activation, TLP use and who receives what.
- Activate and reportCollection starts once the incident lead sends the first questions; updates follow on the agreed schedule.
Deliverables, Timing and Legal Points
Short timed updates during the incident, a consolidated report afterward and evidence kept in a form counsel and insurers can use.
During the incident you receive short updates at the agreed rhythm, each with findings, confidence and a TLP label. Small questions, such as whether a group has posted your name, can sometimes be answered within a business day; a consolidated report for the lessons-learned review follows from 10 business days. Urgent delivery costs 50% more, a senior analyst reviews every update, the fee is fixed after written scoping and goes down if we miss the agreed date.
Many organizations route incident support through breach counsel; ask yours how that affects instructions and reporting. Personal data in leaked material is minimized and handled under the GDPR and similar rules. The wider toolkit, infrastructure pivoting, attribution and ransomware support, sits in our OSINT cyber investigations service; if the trail leads to a staff member, the case moves to an insider threat investigation with HR and legal. Incident support is one of the OSINT services for security teams we provide.
Get the Outside View While It Still Matters
Send your incident lead's first questions and the indicators you can share. We confirm scope, timing and a fixed fee in writing.
OSINT Incident Response FAQ
We're two days into a ransomware incident and our forensics firm is busy imaging servers — what can OSINT incident response add right now, and how quickly can you start?
It adds the outside view while forensics works inside: whether the group has posted your name or samples, what its usual playbook looks like, which infrastructure it is using and whether your access or data is being offered elsewhere. Work starts once scope and the first questions are agreed in writing, and small questions can sometimes be answered within a business day. Updates go to your incident lead, labeled with TLP.
Our incident lead worries that searching for the attacker's domains could tip them off that we've noticed — how do you collect without alerting them?
Lookups run from separate, non-attributable environments, never from your network or named accounts, and most of the work uses passive sources such as registration, certificate and historical DNS data that the attacker cannot see being queried. We do not visit attacker panels, message the group or upload your samples to public scanning services without approval. If an action could be noticed, we ask the incident lead first.
We want to share indicators from our incident with our sector ISAC but legal is nervous about what leaves the building — how do you handle that?
Every finding we deliver carries a TLP label agreed with your incident lead, so it is clear what can go to the ISAC, to suppliers or nowhere. We can prepare a separate sharing version with internal details stripped, typically labeled TLP:GREEN for community sharing. Your counsel still decides what is released; we simply make the shareable version easy to approve.
Should we set up an OSINT retainer before an incident happens, or is it fine to call you when something goes wrong?
Both work, but a retainer saves the first day. With an NDA, scope, activation contacts and your baseline of domains, brands and suppliers agreed in advance, collection can start within hours of a call. Without one, we first need those basics in writing. A short tabletop exercise with your team is the easiest way to test the arrangement.
Our cyber insurer has its own incident response panel — can we still bring in outside OSINT support without breaking the policy terms?
Check the policy and ask the insurer or breach counsel before adding anyone. Panels often cover forensics and negotiation but not outside-in intelligence, and many insurers accept additional providers when they are approved in advance. Our work does not touch your systems, so it rarely overlaps with the panel firm. We coordinate through your incident lead or counsel so nothing is done twice.
Sources and Notes
- NIST SP 800-61 Rev. 3: Incident Response Recommendations and Considerations for Cybersecurity Risk Management (April 2025)
- FIRST: Traffic Light Protocol (TLP) 2.0
- Regulation (EU) 2016/679 (GDPR)
Sources checked 10 October 2026. Figures about third-party firms and tools are as published by them or by the cited source on that date.