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Unusual Remote File Size

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Unusual Remote File Size

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A machine learning job has detected an unusually high file size shared by a remote host indicating potential lateral movement activity. One of the primary goals of attackers after gaining access to a network is to locate and exfiltrate valuable information. Instead of multiple small transfers that can raise alarms, attackers might choose to bundle data into a single large file transfer.

Rule type: machine_learning

Rule indices: None

Severity: low

Risk score: 21

Runs every: 15m

Searches indices from: now-90m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Use Case: Lateral Movement Detection
Rule Type: ML
Rule Type: Machine Learning
Tactic: Lateral Movement

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Lateral Movement
- ID: TA0008
- Reference URL: https://attack.mitre.org/tactics/TA0008/
Technique:
- Name: Exploitation of Remote Services
- ID: T1210
- Reference URL: https://attack.mitre.org/techniques/T1210/

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