From 7d7d010509b62fe3bef835f6dbe950c6d682c9ef Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Tue, 8 Dec 2020 16:38:23 +0100
Subject: [PATCH] [New Rule] Persistence via Hidden Run Key ValName (#534)

* [New Rule] Persistence via Hidden Run Key Detected

* added strings length condition

* added description

* Update persistence_via_hidden_run_key_valuename.toml

* Update rules/windows/persistence_via_hidden_run_key_valuename.toml

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>

* commented length for stability

no logic impact

* eql syntax

* ecs_version

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
Co-authored-by: David French <56409778+threat-punter@users.noreply.github.com>
---
 ...sistence_via_hidden_run_key_valuename.toml | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 rules/windows/persistence_via_hidden_run_key_valuename.toml

diff --git a/rules/windows/persistence_via_hidden_run_key_valuename.toml b/rules/windows/persistence_via_hidden_run_key_valuename.toml
new file mode 100644
index 000000000..17a869ca6
--- /dev/null
+++ b/rules/windows/persistence_via_hidden_run_key_valuename.toml
@@ -0,0 +1,50 @@
+[metadata]
+creation_date = "2020/11/15"
+maturity = "production"
+updated_date = "2020/11/15"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies a persistence mechanism that utilizes the NtSetValueKey native API to create a hidden (null
+terminated) registry key. An adversary may use this method to hide from system utilities such as
+the Registry Editor (regedit).
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*", "winlogbeat-*"]
+language = "eql"
+license = "Elastic License"
+name = "Persistence via Hidden Run Key Detected"
+references = [
+    "https://github.com/outflanknl/SharpHide",
+    "https://github.com/ewhitehats/InvisiblePersistence/blob/master/InvisibleRegValues_Whitepaper.pdf",
+]
+risk_score = 73
+rule_id = "a9b05c3b-b304-4bf9-970d-acdfaef2944c"
+severity = "high"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
+type = "eql"
+
+query = '''
+/* Registry Path ends with backslash */
+registry where /* length(registry.data.strings) > 0 and */
+ registry.path : ("HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\", 
+                  "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\", 
+                  "HKLM\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\\", 
+                  "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\", 
+                  "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1060"
+name = "Registry Run Keys / Startup Folder"
+reference = "https://attack.mitre.org/techniques/T1060/"
+
+
+[rule.threat.tactic]
+id = "TA0003"
+name = "Persistence"
+reference = "https://attack.mitre.org/tactics/TA0003/"