WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

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Description

This search provides detection of suspicious use of sts:GetSessionToken. These tokens can be created on the go and used by attackers to move laterally and escalate privileges.

  • Type: Hunting

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2020-07-27
  • Author: Rod Soto, Splunk
  • ID: 85d7b35f-b8b5-4b01-916f-29b81e7a0551

Annotations

ATT&CK
ID Technique Tactic
T1550 Use Alternate Authentication Material Defense Evasion, Lateral Movement
Kill Chain Phase
  • Exploitation
NIST
CIS20
CVE 
1
2
3
4
5

`aws_cloudwatchlogs_eks` ASIA  userIdentity.type=IAMUser
| spath eventName 
| search eventName=GetSessionToken 
| table sourceIPAddress eventTime userIdentity.arn userName userAgent user_type status region 
| `aws_detect_sts_get_session_token_abuse_filter`

Macros

The SPL above uses the following Macros:

Note that aws_detect_sts_get_session_token_abuse_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • userIdentity.type
  • eventName
  • sourceIPAddress
  • eventTime
  • userIdentity.arn
  • userName
  • userAgent
  • user_type
  • status
  • region

How To Implement

You must install splunk AWS add-on and Splunk App for AWS. This search works with cloudwatch logs

Known False Positives

Sts:GetSessionToken can be very noisy as in certain environments numerous calls of this type can be executed. This search can be adjusted to provide specific values to identify cases of abuse. In specific environments the use of field requestParameters.serialNumber will need to be used.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 tbd

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1