From 8a1909ccc276990cfd1f311ffdc3cca4b925d3ee Mon Sep 17 00:00:00 2001
From: Austin Songer <austin@songer.pro>
Date: Sat, 24 Jul 2021 11:32:07 -0500
Subject: [PATCH] Create aws_sts_getsessiontoken_abuse.yml

---
 rules/cloud/aws_sts_getsessiontoken_abuse.yml | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 rules/cloud/aws_sts_getsessiontoken_abuse.yml

diff --git a/rules/cloud/aws_sts_getsessiontoken_abuse.yml b/rules/cloud/aws_sts_getsessiontoken_abuse.yml
new file mode 100644
index 000000000..682b1d005
--- /dev/null
+++ b/rules/cloud/aws_sts_getsessiontoken_abuse.yml
@@ -0,0 +1,27 @@
+title: AWS STS GetSessionToken Abuse
+id: b45ab1d2-712f-4f01-a751-df3826969807
+description: Identifies the suspicious use of GetSessionToken. Tokens could be created and used by attackers to move laterally and escalate privileges.
+author: Austin Songer
+status: experimental
+date: 2021/07/24
+references:
+    - https://docs.aws.amazon.com/STS/latest/APIReference/API_GetSessionToken.html
+logsource:
+    service: cloudtrail
+detection:
+    selection_source:
+        - eventSource: sts.amazonaws.com
+    selection_eventname1:
+        - eventName: GetSessionToken
+    selection_usertype:
+        - userIdentity.type: IAMUser
+    condition: all of them
+level: low
+tags:
+  - attack.lateral_movement
+	- attack.privilege_escalation
+	- attack.t1548
+  - attack.t1550
+	- attack.t1550.001
+falsepositives:
+- GetSessionToken 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. GetSessionToken from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.