Evidence-Driven Architecture for High-Fidelity DFIR: Multilayer Correlation, Mathematical Formalization, and Empirical Evaluation in Enterprise Environments

1. Introduction

The discipline of Digital Forensics and Incident Response (DFIR) has evolved significantly over the past two decades in response to the growing sophistication of cyber threats. Modern intrusion campaigns often combine initial exploitation, lateral movement, persistence, and data exfiltration in multiple stages, frequently distributed across diverse systems and infrastructure layers. Widely cited empirical reports indicate that attackers often remain within corporate networks for extended periods before detection, amplifying the potential impact of incidents (VERIZON, 2023).

Recent events widely documented in the literature and industry reports highlight this operational complexity. The SUNBURST campaign associated with the compromise of SolarWinds’ software supply chain demonstrated how adversaries can infiltrate corporate environments through compromised legitimate updates (MANDIANT, 2021). Similarly, the Log4Shell vulnerability (CVE‑2021‑44228) showed how a flaw in widely used libraries can enable remote exploitation at scale, affecting corporate services and cloud applications (APACHE SOFTWARE FOUNDATION, 2021).

In many of these scenarios, investigators must correlate evidence from multiple sources: network logs, volatile memory artifacts, operating system records, endpoint telemetry, and events collected by security platforms. There are specialized tools for each domain — for example, Volatility for memory analysis, Autopsy for disk analysis, Suricata for network traffic inspection, and SIEM systems for log aggregation — yet such tools often operate in isolation, making it difficult to reconstruct coherent end-to-end attack chains (GARFINKEL, 2010).

The absence of rigorous formalization for correlating digital evidence constitutes a recurring problem in forensic investigations. Manual analysis depends heavily on the experience of the individual analyst and is subject to temporal inconsistencies, logging gaps, and difficulties in preserving the digital chain of custody (CASEY, 2011).

This work investigates three central research questions:

RQ1: How can the multissource forensic reconstruction process be mathematically formalized while preserving cryptographic integrity and temporal consistency?

RQ2: Is it possible to significantly reduce investigation time through automatic correlation based on temporal graphs?

RQ3: What is the quantitative impact of an evidence-driven architecture on the accuracy of reconstructing adversarial techniques described in the MITRE ATT&CK framework?

The main contributions of this study are:

• Definition of a formal evidence-driven temporal graph model with verifiable integrity properties.
• Proposal of algorithms for constructing and causally reconstructing multistage attack chains.
• Empirical evaluation in corporate environments and controlled scenarios demonstrating substantial gains in investigative efficiency.

The remainder of the paper is organized as follows. Section 2 presents background and related work. Section 3 describes the threat model and the proposed mathematical formalization. Section 4 presents the methodology. Section 5 describes the implementation. Section 6 presents the experimental evaluation. Section 7 discusses a representative case study. Section 8 analyzes implications and limitations. Section 9 concludes the work.

2. Background and Related Work

Digital forensics is defined as the scientific process of identifying, preserving, analyzing, and presenting digital evidence in a manner admissible in investigative and legal proceedings (CASEY, 2011). Widely used incident response guidelines were established by NIST in SP 800‑61, which defines structured phases including preparation, detection, containment, eradication, and recovery (CICHONSKI et al., 2012).

Formally, a set of events observed during an investigation can be represented as:

$$ E = { e_i \mid e_i = (s_i, t_i, a_i, h_i) } $$

where:

• $s_i$ represents the evidence source;
• $t_i$ corresponds to the event timestamp;
• $a_i$ represents the observed artifact;
• $h_i$ represents the cryptographic hash used to ensure integrity.

The academic literature presents several approaches to automated analysis of digital evidence. Garfinkel (2010) discusses the challenges associated with analyzing large volumes of forensic data and emphasizes the need for automation at scale. Carrier (2005) introduces a structured conceptual model for file system analysis in digital investigations.

Another line of research focuses on automated log analysis. The DeepLog system uses recurrent neural networks to detect anomalous patterns in system records (DU et al., 2017). Subsequent work expanded this approach to the analysis of large volumes of operational telemetry (HE et al., 2018).

In the context of attack modeling, attack graphs have been used to represent possible exploitation paths in complex systems (SHEYNER et al., 2002). However, such models focus predominantly on preventive analysis and risk assessment, rather than on post-incident reconstruction based on collected evidence.

In addition, contemporary corporate environments include hybrid infrastructure composed of on-premises resources, cloud services, and containerized workloads. Modern security platforms, often described as Cloud-Native Application Protection Platforms (CNAPP), integrate multiple detection and observability capabilities (SCANDARIATO; SASSO, 2023). Integrating these telemetry sources with structured forensic investigations remains an open challenge.

Among the recurring limitations observed in the literature, the following stand out:

• temporal synchronization inconsistencies between systems;
• absence of verifiable digital chain-of-custody mechanisms;
• low integration between memory, network, and endpoint evidence;
• dependence on opaque heuristics.

The proposal presented in this work seeks to overcome these limitations through the integration of formal modeling, cryptographic integrity, and automated correlation based on temporal graphs.

3. Threat Model and Problem Formalization

We consider an adversary $A$ capable of executing multistage intrusion campaigns in corporate environments. The adversary has the following typical capabilities, aligned with the MITRE ATT&CK framework (MITRE, 2024):

1. exploitation of publicly exposed applications (T1190);
2. lateral movement using administrative protocols such as SMB or WinRM (T1021);
3. establishment of persistence through scheduled tasks (T1053);
4. obfuscation of malicious artifacts (T1027).

Additionally, we assume that the adversary may attempt to remove local artifacts or logs as part of defense evasion techniques (T1070). However, it is assumed that centralized logging and monitoring systems are not fully compromised.

We formally define a forensic graph:

$$ G = (V, E, \tau, \lambda) $$

where:

• $V$ represents the set of vertices corresponding to digital artifacts;
• $E$ represents causal relationships between artifacts;
• $\tau: V \rightarrow \mathbb{R}$ is a temporal function that associates each artifact with a timestamp;
• $\lambda: V \rightarrow L$ represents semantic labels corresponding to adversarial techniques.

The goal of the investigation is to find a subgraph $G’ \subseteq G$ that maximizes the probability of representing the actual observed attack chain.

Reconstruction must satisfy three main properties:

1. Cryptographic integrity

$$ \forall v \in V, ; H(v) = h_v $$

where $H$ represents a secure cryptographic hash function, such as SHA‑256.

2. Temporal consistency

$$ (v_i, v_j) \in E \Rightarrow \tau(v_i) \le \tau(v_j) $$

3. Minimum attack-chain completeness

$$ \frac{|L_{observed}|}{|L_{expected}|} \ge 0.8 $$

where $L_{observed}$ represents the set of identified techniques.

4. Proposed Methodology

The proposed architecture consists of five main layers responsible for collecting, normalizing, correlating, and analyzing digital evidence.

Layer	Function	Tools
Collection	Telemetry capture	Sysmon, Suricata, Auditd
Normalization	Event standardization	Logstash
Indexing	Storage and query	Elasticsearch
Analysis	Forensic extraction	Volatility 3, YARA
Orchestration	Incident management	TheHive, Cortex

Algorithm 1: EviGraph-Builder

Input: raw event set R
Output: forensic graph G

1: Initialize V ← ∅
2: Initialize E ← ∅
3: For each event r ∈ R:
4:     extract artifact v
5:     compute SHA-256(v)
6:     insert v into V
7: Sort V by timestamp
8: For each pair (v_i, v_j):
9:     if causal relationship is observed:
10:        insert edge (v_i, v_j) into E
11: Return G=(V,E)

The worst-case computational complexity is $O(n^2)$, but it can be reduced to $O(n \log n)$ using temporal indexing.

Algorithm 2: CausalPath-Reconstruct

Input: graph G, technique set P
Output: candidate paths C

1: For each technique p ∈ P:
2:     locate vertices with λ(v)=p
3:     perform temporal depth-first search
4:     validate artifact integrity
5:     record consistent path
6:     return set C

5. Implementation

The architecture was implemented in a three-node cluster with the following specifications:

Resource	Configuration
CPU	32 vCPU
Memory	128 GB
Storage	4 TB NVMe
Operating system	Linux

Endpoint telemetry was collected using Sysmon configured with a rule base widely used by the security community.

Traffic inspection was performed with Suricata 7 using the Emerging Threats Open rule set.

Example YARA rule used to detect artifacts associated with Cobalt Strike:

rule CobaltStrike_Beacon {
    strings:
        $loader = "ReflectiveLoader"
    condition:
        $loader
}

Memory analyses were performed with Volatility 3.

vol.py -f memoria.raw windows.pslist

Events were indexed in the Elastic Stack with data retention policies (ILM) configured for 180 days.

6. Experimental Evaluation

The experimental evaluation was conducted using 49 investigative scenarios.

Scenario type	Quantity
Real corporate incidents	37
Controlled scenarios (Atomic Red Team)	12

The evaluated metrics were:

• total investigation time;
• correct adversarial technique correlation rate;
• false positive rate.

Results

Metric	Manual Process	Proposed Architecture
Average investigation time	14.2 h ± 3.1	6.8 h ± 1.9
Correct correlation	78.4%	93.7%
False positive	12.6%	4.3%

Student’s t-test indicated statistical significance with $p < 0.01$.

7. Case Study

A real incident analyzed involved a ransomware attack preceded by compromise of corporate remote access.

The reconstructed sequence included:

1. initial exploitation of an exposed remote service;
2. deployment of a Cobalt Strike beacon;
3. credential harvesting using techniques associated with LSASS memory dumping (T1003);
4. lateral movement across corporate hosts;
5. deployment of the ransomware payload.

The architecture identified 17 distinct MITRE ATT&CK techniques, all temporally correlated in the forensic graph.

Each artifact was preserved with a SHA‑256 hash, ensuring verifiable integrity throughout the entire investigation.

8. Discussion

The results indicate that graph-based temporal formalization contributes significantly to investigative efficiency in complex corporate environments. Automatic correlation of evidence reduces reliance on extensive manual analysis and improves the reproducibility of investigations.

However, some limitations remain relevant. Reconstruction quality depends directly on the availability and integrity of telemetry sources. Environments with incomplete logs or inadequate temporal synchronization may compromise the consistency of the forensic graph.

Another critical factor is clock synchronization across distributed systems. The use of protocols such as NTP is essential to ensure temporal coherence during investigations (MILLS, 2016).

Despite these limitations, the proposed architecture demonstrates practical applicability in corporate security operations centers, especially when integrated with modern observability and cloud security platforms.

9. Conclusion

This work presented an evidence-driven architecture for high-fidelity DFIR investigations, based on formal modeling through verifiable temporal graphs. We demonstrated that the integration of structured telemetry collection, cryptographic preservation of artifacts, and causal reconstruction algorithms can substantially improve investigative efficiency.

The experimental results indicate a significant reduction in investigation time and a substantial increase in the accuracy of adversarial technique correlation.

As future directions, we highlight three main research lines: integration with machine learning models for automatic evidence prioritization, application of the architecture in industrial environments and critical infrastructures, and legal evaluation of the admissibility of evidence reconstructed by automated methods in the context of the Brazilian judicial system.

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