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P4T12ICK
74 lines
2.3 KiB
YAML
74 lines
2.3 KiB
YAML
name: Detect shared ec2 snapshot
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id: 2a9b80d3-6340-4345-b5ad-290bf3d222c4
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version: 2
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date: '2021-07-20'
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author: Bhavin Patel, Splunk
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type: TTP
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datamodel: []
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description: The following analytic utilizes AWS CloudTrail events to identify when
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an EC2 snapshot permissions are modified to be shared with a different AWS account.
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This method is used by adversaries to exfiltrate the EC2 snapshot.
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search: '`cloudtrail` eventName=ModifySnapshotAttribute | rename requestParameters.createVolumePermission.add.items{}.userId
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as requested_account_id | search requested_account_id != NULL | eval match=if(requested_account_id==aws_account_id,"Match","No
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Match") | table _time user_arn src_ip requestParameters.attributeType requested_account_id
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aws_account_id match vendor_region user_agent | where match = "No Match" | `detect_shared_ec2_snapshot_filter` '
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how_to_implement: You must install splunk AWS add on and Splunk App for AWS. This
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search works with AWS CloudTrail logs.
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known_false_positives: It is possible that an AWS admin has legitimately shared a
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snapshot with others for a specific purpose.
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references:
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- https://labs.nettitude.com/blog/how-to-exfiltrate-aws-ec2-data/
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tags:
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analytic_story:
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- Suspicious Cloud Instance Activities
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- Data Exfiltration
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asset_type: EC2 Snapshot
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automated_detection_testing: passed
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cis20:
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- CIS 13
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confidence: 80
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context:
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- Source:Cloud Data
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- Scope:External
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- Outcome:Allowed
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- Stage:Execution
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- Stage:Exfiltration
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1537/aws_snapshot_exfil/aws_cloudtrail_events.json
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impact: 60
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kill_chain_phases:
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- Actions on Objectives
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message: AWS EC2 snapshot from account $aws_account_id$ is shared with $requested_account_id$
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by user $user_arn$ from $src_ip$
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mitre_attack_id:
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- T1537
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nist:
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- PR.DS
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- PR.AC
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- DE.CM
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observable:
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- name: user_arn
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type: User
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role:
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- Attacker
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- name: src_ip
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type: IP Address
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role:
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- Attacker
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product:
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- Splunk Security Analytics for AWS
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- eventName
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- user_arn
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- src_ip
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- requestParameters.attributeType
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- aws_account_id
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- vendor_region
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- user_agent
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risk_score: 48
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security_domain: threat
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