{"source_checked_on":"2026-10-19","schema_version":1,"key":"enterprise/T1681","id":"T1681","name":"Search Threat Vendor Data","domain":"enterprise","reviewed_on":"2026-09-28","source_url":"https://attack.mitre.org/techniques/T1681","source_file":{"file":"enterprise.json","url":"https://raw.githubusercontent.com/mitre-attack/attack-stix-data/20664a889568dce884a1dac0ec7b12ae3a199f51/enterprise-attack/enterprise-attack-20.0.json","sha256":"81113ba98afa2928f3dcff62022539f7ce30c315c32e14422f11ff95ce534352","bytes":55271014},"source_object_sha256":"d74225324527487b44a4a99522cd96c03c3ff8dfd36c50e75b36981d3a9782e8","description":"Threat actors may seek information/indicators from closed or open threat intelligence sources gathered about their own campaigns, as well as those conducted by other adversaries that may align with their target industries, capabilities/objectives, or other operational concerns. These reports may include descriptions of behavior, detailed breakdowns of attacks, atomic indicators such as malware hashes or IP addresses, timelines of a group’s activity, and more. Adversaries may change their behavior when planning their future operations. \n\nAdversaries have been observed replacing atomic indicators mentioned in blog posts in under a week.(Citation: Google Cloud Threat Intelligence VMWare ESXi Zero-Day 2023) Adversaries have also been seen searching for their own domain names in threat vendor data and then taking them down, likely to avoid seizure or further investigation.(Citation: Sentinel One Contagious Interview ClickFix September 2025)\n\nThis technique is distinct from [Threat Intel Vendors](https://attack.mitre.org/techniques/T1597/001) in that it describes threat actors performing reconnaissance on their own activity, not in search of victim information. ","references":[{"source_name":"mitre-attack","url":"https://attack.mitre.org/techniques/T1681","external_id":"T1681"},{"source_name":"Sentinel One Contagious Interview ClickFix September 2025","description":"Aleksandar Milenkoski, Sreekar Madabushi, Kenneth Kinion. (2025, September 4). Contagious Interview | North Korean Threat Actors Reveal Plans and Ops by Abusing Cyber Intel Platforms. Retrieved October 20, 2025.","url":"https://www.sentinelone.com/labs/contagious-interview-threat-actors-scout-cyber-intel-platforms-reveal-plans-and-ops/"},{"source_name":"Google Cloud Threat Intelligence VMWare ESXi Zero-Day 2023","description":"Alexander Marvi, Brad Slaybaugh, Ron Craft, and Rufus Brown. (2023, June 13). VMware ESXi Zero-Day Used by Chinese Espionage Actor to Perform Privileged Guest Operations on Compromised Hypervisors. Retrieved March 26, 2025.","url":"https://cloud.google.com/blog/topics/threat-intelligence/vmware-esxi-zero-day-bypass/"}],"platforms":["PRE"],"environments":["external-services"],"visibility":"outside_target_visibility","visibility_note":"The upstream guidance describes limited target visibility. These are conditional investigation inputs, not direct victim-side detection of preparation. Simulator-side logs do not prove defender visibility.","parent":null,"children":[],"telemetry":[{"id":"proposed-external-intelligence-context-only","name":"External intelligence (context only)","page":"telemetry/proposed-external-intelligence-context-only/","kind":"proposed_input","category":"External context and intelligence","description":"External observations that may contextualize adversary preparation but do not show access to a victim.","collection_focus":"Retain source provenance, confidence and temporal bounds; explicitly label observations outside victim visibility.","providers":[{"name":"Authorized intelligence feeds / STIX repositories","scope":"Provenance-bearing observations and analysis, not direct victim-side logs.","source_id":"stix"},{"name":"RDAP registries/registrars","scope":"Registration context; public fields can be redacted or unavailable.","source_id":"rdap"}],"configuration":["Use an approved feed/API or documented lawful export. Store retrieval time, source URL, original record ID, observation time and confidence separately.","Retain the raw response, licensing constraints and analyst assessment. Deduplicate observations without erasing independent provenance.","Correlate external context with authorized internal observations; do not label ownership, attribution or compromise from a shared indicator alone."],"configuration_example":null,"required_fields":["indicator","source_record","confidence","victim_access_observed"],"example":{"schema":"1200km.telemetry.example.v1","synthetic":true,"timestamp":"2026-09-27T12:00:00Z","telemetry_id":"proposed-external-intelligence-context-only","collector":"illustrative-lab-collector","observation":{"indicator":"lab.example.test","source_record":"lab-feed-1","confidence":"context_only","victim_access_observed":false}},"example_note":"Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.","limitations":"Coverage, licensing, redaction and reporting delays vary. External context is not proof of access to the target, and cannot substitute for unavailable provider-side audit.","sources":[{"id":"stix","title":"OASIS STIX 2.1 specification","url":"https://docs.oasis-open.org/cti/stix/v2.1/os/stix-v2.1-os.html"},{"id":"rdap","title":"ICANN Registration Data Access Protocol","url":"https://www.icann.org/en/contracted-parties/registry-operators/resources/registration-data-access-protocol"}],"association":"proposed_input","anomaly_design":"Changes in external infrastructure, registration or published intelligence can supply context. They do not expose private attacker actions or establish a victim-side detector; preserve timestamps and attribution uncertainty."},{"id":"proposed-provider-side-audit-if-lawfully-available","name":"Provider-side audit (if lawfully available)","page":"telemetry/proposed-provider-side-audit-if-lawfully-available/","kind":"proposed_input","category":"External context and intelligence","description":"Audit records controlled by an external provider that may only be available through an authorized disclosure or account-owner export.","collection_focus":"Document legal/account-owner access and provider coverage before ingestion. Preserve original IDs, timestamps and disclosure limits; do not seek unauthorized access.","providers":[{"name":"Authorized provider/account-owner audit exports","scope":"Available only with the provider or account owner’s lawful access and supported export.","source_id":"cloudtrail"},{"name":"CloudTrail in an owned lab account","scope":"A concrete lab-side example; it does not grant access to adversary-controlled accounts.","source_id":"cloudtrail"}],"configuration":["Establish the authorized account, record owner and export mechanism before collection. Without access, mark this input unavailable rather than simulating defender visibility.","Preserve source event IDs, account/resource IDs, original timestamps and the authorized disclosure/export record.","Document which events the provider actually exposes and compare delivered records to the request scope. Keep lab-side actions separate from victim-side evidence."],"configuration_example":null,"required_fields":["provider_record_id","access_basis","action","victim_network_observation"],"example":{"schema":"1200km.telemetry.example.v1","synthetic":true,"timestamp":"2026-09-27T12:00:00Z","telemetry_id":"proposed-provider-side-audit-if-lawfully-available","collector":"illustrative-lab-collector","observation":{"provider_record_id":"lab-disclosure-1","access_basis":"authorized_test_account_export","action":"account_created","victim_network_observation":false}},"example_note":"Project-normalized synthetic JSON, not a native provider log, captured event, attack verdict or validated detection. A parser/adapter is required for a real SIEM. Example names, IPs and values are fictional.","limitations":"Customer-accessible audit APIs do not expose arbitrary third-party accounts. A synthetic provider event cannot establish access, attribution or detection coverage in a real investigation.","sources":[{"id":"cloudtrail","title":"AWS CloudTrail event categories","url":"https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-events.html"}],"association":"proposed_input","anomaly_design":"Changes in external infrastructure, registration or published intelligence can supply context. They do not expose private attacker actions or establish a victim-side detector; preserve timestamps and attribution uncertainty."}],"detection":{"key":"enterprise/T1681","id":"T1681","name":"Search Threat Vendor Data","domain":"enterprise","platforms":["PRE"],"environments":["external-services"],"source_url":"https://attack.mitre.org/techniques/T1681","technique_page":"techniques/enterprise/T1681/","page":"detections/enterprise/T1681/","status":"guidance_only","counts":{"sigma":0,"atlas_basic":0,"atlas_anomaly":0,"strategies":1,"analytics":1,"live_validated":0},"sigma_rules":[],"atlas_basic":[],"atlas_anomaly":[],"anomaly_types":[],"strategies":[{"id":"DET0866","name":"Detection of Search Threat Vendor Data","url":"https://attack.mitre.org/detectionstrategies/DET0866","stix_id":"x-mitre-detection-strategy--6b173b90-4b1d-4de8-a506-95b8b10921a7","relationship_id":"relationship--63de6ee0-215c-4e2f-8dec-a8f63989cc10","description":"","analytics":[{"id":"AN1998","name":"Analytic 1998","guidance":"Much of this activity may have a very high occurrence and associated false positive rate, as well as potentially taking place outside the visibility of the target organization, making detection difficult for defenders.","url":"https://attack.mitre.org/detectionstrategies/DET0866#AN1998","platforms":["PRE"],"tuning":[],"log_sources":[]}]}],"telemetry_references":[{"id":"proposed-external-intelligence-context-only","name":"External intelligence (context only)","tag":"Proposed: External intelligence (context only)","page":"telemetry/proposed-external-intelligence-context-only/","kind":"proposed_input"},{"id":"proposed-provider-side-audit-if-lawfully-available","name":"Provider-side audit (if lawfully available)","tag":"Proposed: Provider-side audit (if lawfully available)","page":"telemetry/proposed-provider-side-audit-if-lawfully-available/","kind":"proposed_input"}],"visibility":"outside_target_visibility","visibility_note":"The upstream guidance describes limited target visibility. These are conditional investigation inputs, not direct victim-side detection of preparation. Simulator-side logs do not prove defender visibility.","tool_references":[],"related_parent":null,"article_url":"https://1200km.com/articles/read/2026/2026-04-20-malicious-activity-as-a-statistical-signal-a-detection-engineering-analysis-of-anomaly-bas-90df8b6dea12/","validation":{"source_join":"exact_ids","sigma_yaml":"parsed","backend_compilation":"not_run","live_telemetry":"not_run","detection_execution":"not_run"}},"tools":[],"software":[],"actors":[{"id":"G1048","name":"UNC3886","url":"https://attack.mitre.org/groups/G1048","kind":"intrusion-set","description":"[UNC3886](https://attack.mitre.org/groups/G1048) has replaced indicators mentioned in open-source threat intelligence publications at times under a week after their release.(Citation: Google Cloud Threat Intelligence VMWare ESXi Zero-Day 2023)","relationship_id":"relationship--007e0ded-c7c8-484f-af74-d4182b88c8c5","references":[{"source_name":"Google Cloud Threat Intelligence VMWare ESXi Zero-Day 2023","description":"Alexander Marvi, Brad Slaybaugh, Ron Craft, and Rufus Brown. (2023, June 13). VMware ESXi Zero-Day Used by Chinese Espionage Actor to Perform Privileged Guest Operations on Compromised Hypervisors. Retrieved March 26, 2025.","url":"https://cloud.google.com/blog/topics/threat-intelligence/vmware-esxi-zero-day-bypass/"}]},{"id":"G1052","name":"Contagious Interview","url":"https://attack.mitre.org/groups/G1052","kind":"intrusion-set","description":"[Contagious Interview](https://attack.mitre.org/groups/G1052) has registered accounts with Threat Intelligence vendor services to check for reporting associated with their infrastructure and to evaluate new potential infrastructure.(Citation: Sentinel One Contagious Interview ClickFix September 2025)","relationship_id":"relationship--53404e01-e4dd-451f-a098-65836cd38f9e","references":[{"source_name":"Sentinel One Contagious Interview ClickFix September 2025","description":"Aleksandar Milenkoski, Sreekar Madabushi, Kenneth Kinion. (2025, September 4). Contagious Interview | North Korean Threat Actors Reveal Plans and Ops by Abusing Cyber Intel Platforms. Retrieved October 20, 2025.","url":"https://www.sentinelone.com/labs/contagious-interview-threat-actors-scout-cyber-intel-platforms-reveal-plans-and-ops/"}]}],"mitigations":[{"id":"M1056","name":"Pre-compromise","url":"https://attack.mitre.org/mitigations/M1056","kind":"course-of-action","description":"This technique cannot be easily mitigated with preventive controls since it is based on behaviors performed outside of the scope of enterprise defenses and controls. Efforts should focus on designing defenses that are not reliant on atomic indicators.","relationship_id":"relationship--7c0db609-3c5a-4e70-8fc6-5dc6905f560e","references":[]}],"candidates":[],"simulation":{"atomic_status":"no_atomic_candidate","lab_execution":"not_run","browser_attack_runner":false,"prerequisites":"Use disposable lab hosts and test accounts, explicit target allowlists, a clean snapshot, bounded egress and a restore plan. Review every candidate and dependency before any execution.","scenario":null},"validation":{"source_identity":"checked_against_pinned_source","relationship_join":"exact_ids_no_inheritance","page_contract":"automated_checks_required","sensor_capture":"not_run","detection_backend":"not_run","adversary_simulation":"not_run","independent_incident_fact_check":"not_performed"},"technique_links":{"T1597.001":"/ttp-simulation/techniques/enterprise/T1597.001/","T1681":"/ttp-simulation/techniques/enterprise/T1681/"},"synthetic":{"schema":"1200km.ttp.collection-fixture.v1","synthetic":true,"technique_key":"enterprise/T1681","purpose":"Collection/parser contract exercise, NOT a positive example or detection of this TTP.","events":[{"schema":"1200km.telemetry.example.v1","synthetic":true,"timestamp":"2026-09-27T12:00:00Z","telemetry_id":"proposed-external-intelligence-context-only","collector":"illustrative-lab-collector","observation":{"indicator":"lab.example.test","source_record":"lab-feed-1","confidence":"context_only","victim_access_observed":false}},{"schema":"1200km.telemetry.example.v1","synthetic":true,"timestamp":"2026-09-27T12:00:00Z","telemetry_id":"proposed-provider-side-audit-if-lawfully-available","collector":"illustrative-lab-collector","observation":{"provider_record_id":"lab-disclosure-1","access_basis":"authorized_test_account_export","action":"account_created","victim_network_observation":false}}]}}