After a breach, the questions that matter most are the hardest to answer: how did the attacker get in, what did they touch, what did they take, and can you prove it to a regulator, an insurer or a court? Digital forensics firms answer those questions. They collect and preserve evidence under chain of custody, analyze endpoints, servers, cloud logs and mobile devices, reverse engineer malware and write findings that stand up to legal scrutiny.
The work is getting harder. Attackers now use AI tools to write custom malware, blend into normal admin activity and wipe logs faster, so investigators have less evidence to work with and more pressure to deliver answers quickly. At the same time, notification laws, SEC disclosure rules and litigation mean the forensic report itself often becomes a legal document. Choosing a firm with both technical depth and courtroom experience matters.
The ten digital forensics firms below cover breach investigations, DFIR retainers, and litigation and eDiscovery forensics. If you need a broader response partner, compare them with our list of top incident response companies.
Digital Forensics Firms At A Glance
Company
Headquarters
Best For
Core Services
Kroll
New York, USA
Breach investigations that may end in litigation
Computer, cloud and mobile forensics, malware analysis
LevelBlue
Dallas, USA
Litigation-minded DFIR with eDiscovery and expert witnesses
Coordinated forensics and recovery under one advisor
DFIR, technical advisory, recovery coordination
Arete
Boca Raton, USA
Insured organizations hit by ransomware
Incident response, forensics, restoration
Ontrack
Eden Prairie, USA
Recovering evidence from damaged or encrypted storage
Forensic data recovery, backup and database repair
Best Digital Forensics Firms For 2027
1. Kroll — Computer, Cloud And Mobile Forensics Under Strict Chain Of Custody
Kroll is a New York-based risk and investigations firm whose cyber practice runs a broad digital forensics service. It covers computer forensics across many device types and network sizes, cloud forensics for virtual servers, applications and logs, and mobile device forensics for investigations and legal requests. Malware analysis and reverse engineering, data collection and preservation, and forensic analysis to determine whether data was compromised and how far the compromise spread round out the offering.
Kroll’s strength is that its forensics sits next to decades of investigations work. Every stage follows a strict chain-of-custody protocol, which matters when evidence may end up in court or in front of a regulator. The firm also offers a Cyber Risk Retainer for incident response and proactive services. Kroll is a strong fit for legal teams and corporations that expect a breach to lead to disputes, notification obligations or insurance claims and need findings that hold up.
2. LevelBlue — Litigation-Minded DFIR With eDiscovery And Expert Witnesses
LevelBlue, headquartered in Dallas, combines DFIR teams with roots in Stroz Friedberg, Trustwave and Cybereason. The company describes its response as litigation-minded and cyber insurance approved, and lists more than 300 DFIR experts. Services include incident readiness, digital forensics, incident response, tabletop exercises, compromise assessments, eDiscovery, expert witness services and digital risk protection.
The Stroz Friedberg heritage is what makes LevelBlue notable for forensics buyers. That practice built its reputation on investigations that end in court, and the combination of eDiscovery and expert witness work under one roof is rare among DFIR providers. Emergency incident response is available around the clock without a retainer, and a Resilience Retainer gives priority access. It is a good choice for law firms and in-house counsel who need forensics, review and testimony from a single provider.
3. FTI Consulting — Forensics Tied To Investigations And Litigation Support
FTI Consulting, headquartered in Washington, D.C., was founded in 1982 as Forensic Technologies International and has deep roots in expert testimony and dispute work. Its cybersecurity practice offers incident response and recovery, complex investigations and litigation support, digital forensics, cyber readiness assessments and exercises, regulatory compliance and threat intelligence.
FTI is best when the technical investigation is only part of the problem. Its teams support every phase of litigation, and the firm has long-standing e-discovery capability that grew from its acquisition of Ringtail. That combination suits boards, general counsel and outside law firms handling breaches with regulatory inquiries, shareholder claims or contract disputes attached. Buyers who also need crisis communications or data privacy guidance can keep those workstreams with the same firm.
4. Mandiant — Forensic Investigation Of High-Profile Intrusions
Mandiant, based in Reston, Virginia, is a Google Cloud subsidiary that has provided incident response and security consulting for years. Google completed its acquisition of the firm in September 2022. Mandiant’s responders have worked on some of the most widely reported incidents of the past decade, including the Colonial Pipeline ransomware attack, the SolarWinds supply chain compromise and the 2024 Snowflake-related breach investigation.
That track record gives Mandiant deep insight into nation-state groups and advanced criminal crews, which shapes how its forensic investigators look for persistence and lateral movement. It is best for large enterprises, critical infrastructure operators and public sector bodies facing sophisticated adversaries, where attribution and full scoping matter. Smaller organizations may find its engagements more than they need and should compare scope and pricing carefully.
5. CrowdStrike — Root-Cause Forensics Across Endpoint, Identity And Cloud
CrowdStrike, headquartered in Austin, Texas, runs a 24/7 incident response service alongside its Falcon platform. Its forensic experts identify root cause, hidden persistence and lateral movement, then guide clients through remediation. Responders can deploy within hours to contain threats across endpoints, identities and cloud systems, and the service extends into restoring systems and verifying data integrity.
CrowdStrike’s advantage is speed and visibility. Investigations use platform-assisted forensic insights, pattern detection and timeline correlation, informed by tracking of more than 280 adversary groups. The firm works with law firms and cyber insurers to coordinate investigations, and offers a services retainer for priority access. It suits organizations that want forensics and containment from a team that can instrument the environment quickly, especially if they already run Falcon.
6. Unit 42 — Forensically Sound Investigations With Defensible Reporting
Unit 42 is the threat intelligence and security consulting team of Palo Alto Networks, headquartered in Santa Clara, California. Its digital forensics service focuses on forensically sound investigations with defensible reporting meant to reduce legal and operational risk, and it sits alongside incident response that aims to speed recovery and limit business impact. Unit 42 reports investigating and containing more than 5,000 security incidents.
What stands out is the link between investigators and threat research. Unit 42 publishes technical analysis of active threats, and that intelligence feeds directly into investigations. Its case studies include a government client that contained a ransomware threat in three days and restored critical services in seven. A retainer option provides on-demand access. Unit 42 is a good fit for organizations that want enterprise-grade forensic reporting and threat context, whether or not they use Palo Alto products.
7. Sygnia — Elite Investigators For Persistent, Sophisticated Attacks
Sygnia is a Tel Aviv-based incident response and consulting firm founded by veterans of Israeli military intelligence and backed by Temasek. Its teams investigate attacks, stop intruders and repair breaches, and they have published research linking ransomware operations to larger threat actors. Sygnia’s incident response work includes tactical negotiation and immediate remediation alongside the investigation.
Sygnia is best suited to large enterprises in sectors such as finance and critical infrastructure, where adversaries are skilled and persistent and an incomplete investigation means a second compromise. Its research output shows the depth of its threat analysis, which helps when forensic findings must explain not just what happened but who is behind it. Organizations in Asia-Pacific and Latin America can also reach its regional teams.
8. MOXFIVE — DFIR Delivered Through A Single Technical Advisor
MOXFIVE, founded in 2019 and based in Tysons, Virginia, added its own DFIR services to an incident management platform that coordinates every technical workstream during an attack. Clients work with one Technical Advisor who explains technical findings to executives and counsel, while forensics, recovery and resilience work runs in parallel through MOXFIVE staff and its curated partner ecosystem.
This approach suits organizations that want forensic answers without managing a crowd of vendors. Because the same advisor oversees forensics and recovery, evidence preservation is less likely to be trampled by rebuild work, a common problem in ransomware cases. MOXFIVE is a strong option for mid-market and enterprise companies, and for the law firms advising them, that value clear coordination as much as raw investigative depth.
9. Arete — Ransomware-Focused DFIR Built Around Insurers And Counsel
Arete is an incident response firm with its global headquarters in Boca Raton, Florida, and an APAC headquarters in Hyderabad. It draws on data from thousands of engagements to guide decisions on response, remediation, recovery and payment, and deploys SentinelOne EDR across affected environments to contain threats and gather evidence. SentinelOne named Arete its 2026 incident response partner of the year.
Arete is a practical choice for insured organizations dealing with ransomware and extortion. Engagements include an incident response lead, a project manager and counsel, with daily updates to clients, lawyers and carriers. Its forensic findings feed directly into restoration and, where unavoidable, sanctions-compliant negotiation. Organizations that need deep litigation or expert witness work may want to pair Arete with a firm focused on disputes.
10. Ontrack — Forensic Data Recovery From Damaged And Encrypted Systems
Ontrack, operated by KLDiscovery Ontrack from Eden Prairie, Minnesota, is a data recovery specialist that often supports forensic investigations when evidence is locked inside damaged or encrypted storage. It recovers data from most operating systems and file systems, including NetApp WAFL, ZFS, SAN volumes, virtual disks and datastores, and repairs databases and backup files from tools such as Veeam, Commvault, TSM, Networker and Acronis.
Ontrack is not a full DFIR firm, but it fills a gap many investigators hit. When logs live on a corrupted array or the only copy of a mailbox sits in a broken backup, its engineers build custom tools to extract the data. It offers emergency 24/7 service and a free initial consultation. Use Ontrack alongside a primary forensics firm when recovering the raw evidence is the obstacle.
How To Choose A Digital Forensics Firm
Forensics engagements are often urgent and expensive, so settle the key questions before you need them.
Do We Need Breach Forensics Or Litigation Forensics?
Breach forensics focuses on scoping an intrusion and supporting notification decisions. Litigation forensics focuses on evidence for disputes, employee investigations and eDiscovery, often with expert testimony. Some firms do both well; many lean one way. Match the firm to the outcome you need.
Will The Findings Hold Up In Court?
Ask how the firm documents chain of custody, which tools it uses for acquisition, and whether its examiners have testified before. Engaging through outside counsel can also help protect privilege over the forensic report.
Are They Approved By Our Cyber Insurer?
Most cyber policies require panel vendors or carrier consent. Confirm your preferred firm is approved, and agree retainer terms in advance so you are not negotiating rates mid-incident. A written data breach response plan should name the firm and the contact path.
Can They Investigate Cloud And SaaS Environments?
Much of today’s evidence lives in identity providers, cloud control planes and SaaS audit logs, not on disks. Ask for examples of cloud and identity investigations, and check how quickly the firm can collect logs before retention windows expire. Our list of cloud security companies can help with longer-term coverage.
What Happens After The Investigation?
A good forensic report should end with specific remediation steps. Ask whether the firm helps implement them, offers compromise assessments later, or hands off to a managed security partner.
Conclusion
The right digital forensics firm depends on where the case is heading. Kroll, LevelBlue and FTI Consulting are strongest when litigation, regulators or expert testimony are likely. Mandiant, CrowdStrike, Unit 42 and Sygnia bring deep threat knowledge to complex intrusions. MOXFIVE and Arete fit insured organizations that need forensics tightly linked to recovery, and Ontrack recovers the evidence others cannot reach. Put a retainer in place now, and make sure your insurer and counsel agree on the choice.
