From c2e95a35dca40cd9ca9790a72cc21df88c832ba3 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Tue, 22 Sep 2020 14:39:04 +0200
Subject: [PATCH] [New Rule] Evasion via Renamed AutoIt Scripts Interpreter
 (#234)

* [New Rule] Evasion via Renamed AutoIt Scripts Interpreter

* Update defense_evasion_masquerading_renamed_autoit.toml

* Update defense_evasion_masquerading_renamed_autoit.toml

* Update defense_evasion_masquerading_renamed_autoit.toml

* Update defense_evasion_masquerading_renamed_autoit.toml

* Update defense_evasion_masquerading_renamed_autoit.toml

* Update rules/windows/defense_evasion_masquerading_renamed_autoit.toml

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>

* Update rules/windows/defense_evasion_masquerading_renamed_autoit.toml

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

Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
---
 ...e_evasion_masquerading_renamed_autoit.toml | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 rules/windows/defense_evasion_masquerading_renamed_autoit.toml

diff --git a/rules/windows/defense_evasion_masquerading_renamed_autoit.toml b/rules/windows/defense_evasion_masquerading_renamed_autoit.toml
new file mode 100644
index 000000000..ecd16ccf6
--- /dev/null
+++ b/rules/windows/defense_evasion_masquerading_renamed_autoit.toml
@@ -0,0 +1,41 @@
+[metadata]
+creation_date = "2020/09/01"
+ecs_version = ["1.6.0"]
+maturity = "production"
+updated_date = "2020/09/01"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies a suspicious AutoIt process execution. Malware written as AutoIt scripts tend to rename the AutoIt
+executable to avoid detection. 
+"""
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "lucene"
+license = "Elastic License"
+name = "Renamed AutoIt Scripts Interpreter"
+risk_score = 47
+rule_id = "2e1e835d-01e5-48ca-b9fc-7a61f7f11902"
+severity = "medium"
+tags = ["Elastic", "Windows"]
+type = "query"
+
+query = '''
+event.category:process AND event.type:(start OR process_started) AND
+  process.pe.original_file_name:/[aA][uU][tT][oO][iI][tT]\d\.[eE][xX][eE]/ AND
+  NOT process.name:/[aA][uU][tT][oO][iI][tT]\d{1,3}\.[eE][xX][eE]/
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1036"
+name = "Masquerading"
+reference = "https://attack.mitre.org/techniques/T1036/"
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"