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[Tuning] Potential Ransomware Behavior - Note Files by System #5235

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Merged
merged 4 commits into from
Nov 10, 2025
Merged

[Tuning] Potential Ransomware Behavior - Note Files by System #5235

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e374ff5
Update impact_high_freq_file_renames_by_kernel.toml
Samirbous Oct 21, 2025
9a360c2
Update impact_high_freq_file_renames_by_kernel.toml
Samirbous Oct 21, 2025
8deb2be
Update rules/windows/impact_high_freq_file_renames_by_kernel.toml
Samirbous Oct 21, 2025
691365f
Merge branch 'main' into Samirbous-patch-1
Samirbous Nov 10, 2025
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6 changes: 3 additions & 3 deletions rules/windows/impact_high_freq_file_renames_by_kernel.toml
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Expand Up @@ -2,7 +2,7 @@
creation_date = "2024/05/03"
integration = ["endpoint"]
maturity = "production"
updated_date = "2025/09/30"
updated_date = "2025/10/21"

[rule]
author = ["Elastic"]
Expand Down Expand Up @@ -75,10 +75,10 @@ from logs-endpoint.events.file-* metadata _id, _version, _index
// truncate the timestamp to a 60-second window
| eval Esql.time_window_date_trunc = date_trunc(60 seconds, @timestamp)

| keep file.path, file.name, process.entity_id, Esql.time_window_date_trunc
| keep user.id, user.name, file.path, file.name, process.entity_id, Esql.time_window_date_trunc, host.name, host.ip

// filter for same file name dropped in at least 3 unique paths by the System virtual process
| stats Esql.file_path_count_distinct = COUNT_DISTINCT(file.path), Esql.file_path_values = VALUES(file.path) by process.entity_id , file.name, Esql.time_window_date_trunc
| stats Esql.file_path_count_distinct = COUNT_DISTINCT(file.path), Esql.file_path_values = VALUES(file.path), Esql.host_ips = values(host.ip) by host.name, user.name, user.id, process.entity_id , file.name, Esql.time_window_date_trunc
| where Esql.file_path_count_distinct >= 3
'''

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