S1179: Exbyte
Analyst context for executives and security teams
Exbyte matters because it represents a Windows-focused data exfiltration tool associated in ATT&CK with BlackByte operations. Its practical risk is not just malware execution; it is the movement of collected files to legitimate online file sharing and hosting services, which can blend into normal business traffic and complicate incident scoping.
Executive priority
Prioritize questions around data-loss readiness: which Windows systems can reach external file-sharing services, what sensitive data could be staged or transferred, and whether the SOC can prove what left the environment. This object is especially relevant for ransomware and extortion preparedness, incident response evidence, egress control decisions, and audit conversations about monitoring of high-risk outbound data paths.
Technical view
ATT&CK provides no official detection text for Exbyte, so defenders should validate coverage around its documented behavior and relationships: Windows execution, file and directory discovery, local group discovery, security software discovery, system checks, deobfuscation or decoding activity, file deletion, and exfiltration over web services. SOC and IR teams should correlate host activity that discovers files, permissions, and defenses with unusual outbound transfers to file sharing or hosting services.
Likely telemetry
- Windows endpoint process execution and command-line telemetry
- File system enumeration, access, staging, and deletion events
- Local group and permission discovery events
- Security tool or agent discovery indicators on endpoints
- Outbound network connection logs, proxy logs, firewall logs, and DNS records
Detection direction
- Baseline legitimate use of online file sharing and hosting services, then investigate unusual upload volume, new destinations, uncommon processes, or sensitive hosts initiating transfers.
- Correlate discovery behaviors before exfiltration: local group queries, file and directory enumeration, and security software discovery can increase confidence when seen near suspicious outbound web-service traffic.
- Account for blind spots caused by SSL/TLS, approved cloud storage access, limited endpoint logging, and file deletion after activity.
- Tune carefully for business-approved file sharing to reduce false positives while maintaining higher scrutiny for servers, privileged workstations, and systems containing regulated or business-critical data.
Mitigation priorities
- Review and restrict outbound access to unsanctioned file sharing and hosting services where business requirements allow.
- Enforce least privilege around local groups and administrative access so discovery of permissions yields less useful opportunity.
- Improve endpoint and network logging retention to support exfiltration investigations, especially for Windows hosts handling sensitive data.
- Apply data handling controls such as classification, monitoring, and egress review for high-value repositories.
- Prepare IR playbooks to preserve host, proxy, DNS, and firewall evidence quickly because file deletion is part of the related behavior set.
Analyst notes and limits
The supplied ATT&CK object identifies Exbyte as a Go-based exfiltration tool associated with BlackByte operations and observed since 2022. The strongest defensive value is to treat it as a data-theft and ransomware-readiness use case: validate whether discovery activity and web-service exfiltration can be connected in telemetry before an incident.
ATT&CK provides no official detection guidance for this object, no aliases, no explicit tactics on the malware object, and only Windows as the supported platform for Exbyte. Recommendations are inferred from the official description and listed technique relationships, not from guaranteed indicators or vendor-specific detections.
Exbyte
How security teams should use this page
Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.
Techniques used
This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.
| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1106 | Native API | Exbyte calls `ShellExecuteW` with the `IpOperation` parameter `RunAs` to launch `explorer.exe` with elevated privileges.CitationMicrosoft BlackByte 2023 |
| Enterprise | T1480 | Execution Guardrails | Exbyte checks for the presence of a configuration file before completing execution.CitationMicrosoft BlackByte 2023 |
| Enterprise | T1069.001 | Local Groups Sub-technique | Exbyte checks whether the process is running with privileged local access during execution.CitationMicrosoft BlackByte 2023 |
| Enterprise | T1140 | Deobfuscate/Decode Files or Information | Exbyte decodes and decrypts data stored in the configuration file with a key provided on the command line during execution.CitationMicrosoft BlackByte 2023 |
| Enterprise | T1083 | File and Directory Discovery | |
| Enterprise | T1518.001 | Security Software Discovery Sub-technique | |
| Enterprise | T1070.004 | File Deletion Sub-technique | Exbyte will self-delete if a hard-coded configuration file is not found.CitationMicrosoft BlackByte 2023 |
| Enterprise | T1497.001 | System Checks Sub-technique | |
| Enterprise | T1567 | Exfiltration Over Web Service |
Groups, software, and campaigns
G1043: BlackByte
BlackByte is a ransomware threat actor operating since at least 2021. BlackByte is associated with several versions of ransomware also labeled BlackByte Ransomware. BlackByte ransomware operations initially used a common encryption key allowing for the development of a universal decryptor, but subsequent versions such as BlackByte 2.0 Ransomware use more robust encryption mechanisms. BlackByte is notable for operations targeting critical infrastructure entities among other targets across North America.[1][2][3][4][5]
All related ATT&CK context
Object version and sync metadata
The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .
Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.0 | Current bundle | 0de86a4d0a02… |
Mirrored ATT&CK source object
The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.
External references and citations
MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.
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[1]
Symantec BlackByte 2022
Symantec Threat Hunter Team. (2022, October 21). Exbyte: BlackByte Ransomware Attackers Deploy New Exfiltration Tool. Retrieved December 16, 2024.
Open source URL -
[2]
mitre-attack S1179Open source URL
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