Unusual Remote File Size

calendar May 28, 2024 · Use Case: Lateral Movement Detection Rule Type: ML Rule Type: Machine Learning Tactic: Lateral Movement  ·
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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.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2023/10/12"
 3integration = ["lmd", "endpoint"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8anomaly_threshold = 70
 9author = ["Elastic"]
10description = """
11A machine learning job has detected an unusually high file size shared by a remote host indicating potential lateral
12movement activity. One of the primary goals of attackers after gaining access to a network is to locate and exfiltrate
13valuable information. Instead of multiple small transfers that can raise alarms, attackers might choose to bundle data
14into a single large file transfer.
15"""
16from = "now-90m"
17interval = "15m"
18license = "Elastic License v2"
19machine_learning_job_id = "lmd_high_file_size_remote_file_transfer"
20name = "Unusual Remote File Size"
21references = [
22    "https://www.elastic.co/guide/en/security/current/prebuilt-ml-jobs.html",
23    "https://docs.elastic.co/en/integrations/lmd",
24    "https://www.elastic.co/blog/detecting-lateral-movement-activity-a-new-kibana-integration",
25    "https://www.elastic.co/blog/remote-desktop-protocol-connections-elastic-security",
26]
27risk_score = 21
28rule_id = "0678bc9c-b71a-433b-87e6-2f664b6b3131"
29setup = """## Setup
30
31The rule requires the Lateral Movement Detection integration assets to be installed, as well as file and Windows RDP process events collected by the Elastic Defend integration.  
32
33### Lateral Movement Detection Setup
34The Lateral Movement Detection integration detects lateral movement activity by identifying abnormalities in file and Windows RDP events. Anomalies are detected using Elastic's Anomaly Detection feature.
35
36#### Prerequisite Requirements:
37- Fleet is required for Lateral Movement Detection.
38- To configure Fleet Server refer to the [documentation](https://www.elastic.co/guide/en/fleet/current/fleet-server.html).
39- File events collected by the [Elastic Defend](https://docs.elastic.co/en/integrations/endpoint) integration.
40- To install Elastic Defend, refer to the [documentation](https://www.elastic.co/guide/en/security/current/install-endpoint.html).
41
42#### The following steps should be executed to install assets associated with the Lateral Movement Detection integration:
43- Go to the Kibana homepage. Under Management, click Integrations.
44- In the query bar, search for Lateral Movement Detection and select the integration to see more details about it.
45- Follow the instructions under the **Installation** section.
46- For this rule to work, complete the instructions through **Add preconfigured anomaly detection jobs**.
47"""
48severity = "low"
49tags = [
50    "Use Case: Lateral Movement Detection",
51    "Rule Type: ML",
52    "Rule Type: Machine Learning",
53    "Tactic: Lateral Movement",
54]
55type = "machine_learning"
56[[rule.threat]]
57framework = "MITRE ATT&CK"
58[[rule.threat.technique]]
59id = "T1210"
60name = "Exploitation of Remote Services"
61reference = "https://attack.mitre.org/techniques/T1210/"
62
63
64[rule.threat.tactic]
65id = "TA0008"
66name = "Lateral Movement"
67reference = "https://attack.mitre.org/tactics/TA0008/"

References

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