LoFP LoFP / t1537

t1537

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a new transport rule may be created by a system or network administrator. verify that the configuration change was expected. exceptions can be added to this rule to filter expected behavior.
a s3 configuration change may be done by a system or network administrator. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. s3 configuration change from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.
a transport rule may be modified by a system or network administrator. verify that the configuration change was expected. exceptions can be added to this rule to filter expected behavior.
access level modifications may be done by a system or network administrator. verify whether the username, hostname, and/or resource name should be making changes in your environment. access level modifications from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.
administrators may create drive data transfer requests during employee offboarding to preserve files for a manager or successor account.
allowed administrative activities.
ami sharing is a common practice in aws environments. ensure that the sharing is authorized before taking action.
cross-account db snapshot sharing is common in multi-account aws organizations, particularly for backup workflows, migrations, analytics pipelines, and disaster recovery. ensure the added account is expected, previously approved, and aligns with operational change plans before taking action.
cross-account s3 replication is common in multi-account aws organizations, centralized logging architectures, and disaster-recovery designs. confirm whether the destination account is an approved replication target. unexpected replication configuration changes should be treated as suspicious.
customer takeout exports may be created for legal hold, compliance, migration, or user-requested backups. verify the initiator, target user, and export scope are expected.
data engineers and devops teams legitimately use rclone, s5cmd, and s3cmd for bulk data transfers. this rule gates on a scripted parent to suppress interactive use, but automation pipelines that shell out to these tools may still trigger alerts. the 7-day new-terms window suppresses recurring invocations of the same client on the same host after the first alert. allowlist known pipeline executor paths if additional tuning is needed.
iam users may occasionally share ec2 snapshots with another aws account belonging to the same organization. if known behavior is causing false positives, it can be exempted from the rule.
legitimate changes to share an s3 bucket with an external account may be identified as false positives.
logging sink modifications may be done by a system or network administrator. verify whether the user email, resource name, and/or hostname should be making changes in your environment. sink modifications from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.
repositories used to distribute public images may legitimately contain principal:\"*\". this rule does not by itself determine whether a deny statement restricts the same access; review the full policy in \"aws.cloudtrail.request_parameters\" and confirm the granted actions (pull-only versus push) and whether public exposure is intended.
this rule does not differentiate by itself whether the same policy also includes deny statements that restrict public access. if a policy includes both effect=allow and effect=deny with principal:\"*\", this rule may still trigger. such cases should be manually analyzed to verify whether the deny statement effectively negates the public exposure.
traffic mirroring may be done by a system or network administrator. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. traffic mirroring from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.
unknown
valid change to a snapshot's permissions
vm export and ec2 image creation may be done by system administrators, devops or migration teams as part of planned maintenance, disaster-recovery or known backup methods. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. exports from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.
vm exports may be done by a system or network administrator. verify whether the user identity, user agent, and/or hostname should be making changes in your environment. vm exports from unfamiliar users or hosts should be investigated. if known behavior is causing false positives, it can be exempted from the rule.