Potential unauthorized access to a smartphone, deleted messages, unknown account activity, or confidential information suddenly revealed to third parties: Digital incidents often begin with isolated anomalies. However, whether there has actually been manipulation, unauthorized access, or another technical cause can only be determined by examining the available digital evidence.

Our IT forensics team in Düsseldorf supports individuals, companies, lawyers, and other clients with the professional securing and analysis of digital evidence. For private clients, the focus is often on smartphones, messaging apps, personal user accounts, cloud services, and deleted data. Companies require forensic support in cases of data theft, internal suspicions, compromised user accounts, or cyberattacks.

Düsseldorf places particular demands on the protection of digital information. The state capital is one of North Rhine-Westphalia's business centers and home to numerous national and international companies. Where management, communication, confidential company data, and mobile work converge, digital incidents can have significant economic and legal consequences.

IT forensics for Düsseldorf: Digital traces instead of assumptions

Professional IT forensics begins with a specific investigative question. Unusually high battery consumption does not prove smartphone surveillance. A connected USB storage device does not necessarily prove data theft. An unknown login initially only indicates technical activity and not automatically reveals the person responsible.

Therefore, we consistently distinguish between suspicion, technical findings, and expert assessment. Depending on the circumstances, smartphones, computers, data storage devices, user accounts, communication data, or cloud systems may contain relevant traces.

Mobile phone forensics for private individuals in Düsseldorf

Smartphones are among the most important digital evidence in the private sphere. WhatsApp and other messaging apps, photos, emails, contacts, cloud connections, location information, and user accounts can contain clues to digital activities.

A forensic smartphone examination can be useful in various situations, including:

• Suspected unauthorized access
• possible spyware or manipulation
• unknown devices or account connections
• deleted WhatsApp messages
• deleted photos and other data
• digital conflicts after separation or divorce
• Securing electronic evidence for legal disputes

Which data can actually be examined or reconstructed depends on the device, operating system, security status and any remaining technical traces.

Mobile phone hacked or monitored – what can be determined?

A forensic examination can analyze existing evidence of possible unauthorized access. Depending on the smartphone, system artifacts, applications, permissions, account connections, and other relevant data can be evaluated.

Especially after a breakup, the investigation should not be limited solely to spyware. Other authorized devices, known passwords, Apple or Google accounts, email access, family sharing, or cloud synchronizations can also provide avenues of access.

The absence of any reliable evidence of compromise is also a relevant finding for the investigation.

Deleted WhatsApp messages and personal data

Deleted does not automatically mean recoverable. Modern smartphones use encryption and storage mechanisms that can significantly affect reconstruction.

Depending on the device, existing messenger databases, media, backups, and other artifacts can be examined. However, a complete recovery cannot be reliably guaranteed.

If important data has been deleted and an investigation is planned, the smartphone should ideally not be used unnecessarily or reset to factory settings.

iPhone, Android and mobile forensics

The forensic possibilities differ considerably between iPhones and Android devices. For Apple devices, the model, iOS version, device condition, and encryption are particularly relevant. For Android devices, different manufacturers, chipsets, operating system versions, and security configurations also come into play.

Depending on the device, mobile investigations can be carried out using tools such as Cellebrite UFED, MOBILedit Forensic, and MEFF 3 PRO, as well as other specialized tools. Further information can be found in our Mobile Forensics section.

Computer and data storage forensics

Windows PCs, notebooks, Macs, and external storage devices can contain numerous technical traces that are not immediately visible during normal use. Depending on the system, these include file system information, user activity, browser data, connected storage media, and other system artifacts.

For private individuals, investigations might focus on suspected unauthorized access or data deletion. In a corporate environment, data leaks, employee-related issues, and security incidents are more common.

For such investigations, tools such as Cellebrite Collector, Cellebrite Inspector and X-Ways Forensics, as well as other specialized tools, are available.

Düsseldorf as a business location: When digital information becomes evidence

Düsseldorf boasts an exceptionally high density of businesses and is home to numerous German and European corporate headquarters. In addition, it has a strong medium-sized business sector, international business relationships, and a well-developed service industry.

For IT forensics, this means that investigations can often involve sensitive business information: contract and customer data, internal communications, personnel information, calculations, business strategies, access data, or confidential know-how.

In internationally structured companies, relevant digital traces can also be distributed across multiple devices, user accounts, cloud services, and company locations. Therefore, an investigation should not be prematurely reduced to a single computer.

IT forensics for companies, law firms and executives in Düsseldorf

A suspected case of digital fraud can simultaneously touch upon technical, economic, labor law, and data protection issues. Especially when sensitive company information is involved, a clearly defined and transparent investigation is therefore essential.

Typical questions include:

• Has confidential company data been copied or shared?
• Which external storage devices were used?
• Were there any unusual file activities prior to a change of employer.
• Has a user account been used without authorization?
• Were business files deleted or manipulated?
• Which systems were affected by a cyberattack?

If you have a concrete suspicion of a leak of confidential information, you can find further information in our Data Theft section.

Data leaks and employee incidents

Matters surrounding termination of employment, suspension, or a change of employer can be particularly time-sensitive. If there is a concrete suspicion that confidential information has been taken, it should be clarified as early as possible which devices and data sources must be preserved.

Workplace computers, notebooks, company mobile phones, USB storage devices, user accounts, email systems or cloud services can contain different traces depending on the case.

A single technical finding should not be overinterpreted. For example, the connection of a USB stick does not prove that specific company data was copied onto it. The reconstruction becomes more conclusive when several independent pieces of evidence fit together chronologically and factually.

Cyberattacks and compromised corporate systems

Following a cyberattack, threat mitigation and evidence preservation must be coordinated. Premature cleanup or reinstallation can alter crucial evidence. At the same time, a compromised system must not be operated unnecessarily.

Depending on the incident, end devices, user accounts, system logs, email data, and cloud information may be relevant for reconstruction. The goal is not only to establish that a security incident occurred, but also to narrow down the technically traceable sequence of events as much as possible.

Forensic evidence preservation and chain of custody

The validity of an analysis depends significantly on the quality of the underlying data backup. The backup method must therefore be appropriate for the specific object of investigation.

With appropriate data backups, cryptographic hash values ​​can be used to verify the integrity of a data set. A documented chain of custody can additionally record when an object of investigation was acquired, backed up, and processed.

How security, analysis and documentation interact is explained in more detail in the article "Digital Forensics and Verifiable Quality".

Forensic tools for different systems

No single tool can optimally examine all smartphones, computers, and data storage devices. Depending on the type of evidence, tools such as Cellebrite UFED, Cellebrite Collector, Cellebrite Inspector, X-Ways Forensics, MOBILedit Forensic, and MEFF 3 PRO, as well as other specialized systems, are used.

However, the length of the software list is not the crucial factor. A tool extracts and structures data. The forensic achievement lies in correctly interpreting relevant artifacts, examining correlations, and transparently defining the limits of each finding.

Certified quality and expert competence

LB Detektive GmbH has a quality management system certified by TÜV NORD according to DIN EN ISO 9001, the scope of which includes IT forensics. In addition, the expert is certified according to DIN EN ISO/IEC 17024.

This combines defined organizational quality processes with proven, individualized expert competence. For clients, this primarily means structured processes, transparent documentation, and a professional assessment that goes beyond an automatically generated software report.

Typical cases examined in Düsseldorf

Private individual: Access after a separation

A person suspects that a former partner may still be able to access personal information. Investigators are examining not only possible manipulation of the smartphone, but also bank account connections, synchronized devices, and other technically plausible access methods.

Private individual: Deleted communication

For a legal dispute, messages that are no longer visible are needed. The device, messenger, time of deletion, and available data sources are first narrowed down. Only then can the possibility of reconstruction be professionally assessed.

Companies: Confidential data before a change

Before an employee leaves, unusual file activity is detected. Depending on the initial situation, computer artifacts, external storage devices, and other relevant data sources can be compared over time.

How does an IT forensic investigation proceed?

1. Define the research question

First, it is determined which specific technical issue is to be investigated.

2. Determine relevant evidence

Smartphones, computers, data storage devices or accounts are only included if they are relevant to the question at hand.

3. Secure data properly

The backup method depends on the device, operating system, and technical condition.

4. Analyze digital traces

Relevant artifacts are examined and, if necessary, compared with other data sources.

5. Document results

Depending on the assignment, the findings are presented in a comprehensible manner in an investigation report or expert opinion.

What should be avoided before an examination

• Do not hastily reset suspicious smartphones.
• Do not delete apps or user accounts without prior consultation.
• Do not install any unknown spyware or cleaning programs.
• Do not unnecessarily modify computers and data storage devices.
• Use devices with deleted data as little as possible.
• Document security alerts and unknown logins.

IT forensics in Düsseldorf and our areas of operation

Our service area includes Düsseldorf, the closely connected Rhine-Ruhr region, and other parts of North Rhine-Westphalia. These include, among others, Neuss, Ratingen, Meerbusch, Hilden, Mettmann, Krefeld , Duisburg , Mönchengladbach, Essen , Wuppertal , and Cologne.

Private individuals, companies and lawyers from the region can have individual smartphones, computers or data carriers as well as more complex digital issues examined.

Frequently asked questions about IT forensics in Düsseldorf

Can I, as a private individual, commission a mobile phone forensics analysis?

Yes. Private investigations often involve smartphones, deleted communications, possible unauthorized access, user accounts, or digital evidence following personal conflicts.

Is it possible to determine if my smartphone has been hacked?

The device can be examined for any technical traces of possible unauthorized access. Whether a compromise can be proven depends on the device, operating system, and the data still present.

Is it possible to check if my ex-partner still has access to my data?

Depending on the circumstances, relevant devices, account connections, and other access methods may be examined. In addition to malware, authorized devices, known passwords, and synchronized accounts, for example, may be considered.

Can deleted WhatsApp messages be recovered?

A complete or partial reconstruction may be possible under certain technical conditions. However, it cannot be guaranteed.

Can a company investigate a potential data breach?

Yes. Depending on the circumstances, for example, workstations, mobile devices, external storage media, user accounts and other relevant data sources can be examined.

Is it possible to determine if data has been copied to a USB stick?

Traces of connected USB devices and file activity may be present. Whether this allows for the detection of a specific copying operation of particular files must be assessed based on the overall evidence.

Can cyberattacks be investigated retrospectively?

This may be possible if suitable data sources are still available. Which systems need to be examined depends on the specific attack scenario.

Are expert reports prepared?

Yes. Depending on the task at hand, an IT forensic expert report can be prepared in addition to a technical investigation report.

How much does an IT forensic investigation cost?

The costs depend primarily on the number and type of equipment, the amount of data, technical accessibility, the specific question being investigated, and the required documentation. Therefore, in complex cases, the actual scope of the investigation is initially defined.

Request IT forensics services in Düsseldorf

Whether it's a suspicious smartphone, deleted communication, possible unauthorized access, data leakage or cyberattack: For an initial assessment, the affected device or system, the specific anomaly, the relevant time period and possible changes since the incident are particularly important.

Based on this, it can be determined which digital evidence is actually needed and which preservation and analysis method is appropriate for the specific case. Further specialist information can be found in our knowledge database on digital forensics.