From 5ab967b894a996a4cbcaf13f95e9e6d5916fbd59 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Wed, 14 Feb 2024 17:50:27 +0000
Subject: [PATCH 1/2] Create initial_access_execution_from_inetcache.toml

---
 ...itial_access_execution_from_inetcache.toml | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 rules/windows/initial_access_execution_from_inetcache.toml

diff --git a/rules/windows/initial_access_execution_from_inetcache.toml b/rules/windows/initial_access_execution_from_inetcache.toml
new file mode 100644
index 00000000000..bedcbb5d499
--- /dev/null
+++ b/rules/windows/initial_access_execution_from_inetcache.toml
@@ -0,0 +1,54 @@
+[metadata]
+creation_date = "2024/02/14"
+integration = ["endpoint", "windows", "system"]
+maturity = "production"
+min_stack_comments = "New fields added: required_fields, related_integrations, setup"
+min_stack_version = "8.3.0"
+updated_date = "2024/02/14"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies the execution of a process with arguments pointing to the INetCache Folder. Adversaries may deliver malicious
+content via WININET during initial access.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*", "endgame-*", "logs-system.security*"]
+language = "eql"
+license = "Elastic License v2"
+name = "Suspicious Execution from INET Cache"
+references = [
+"https://www.trendmicro.com/en_us/research/24/b/cve202421412-water-hydra-targets-traders-with-windows-defender-s.html"
+]
+risk_score = 73
+rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
+severity = "high"
+tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
+timestamp_override = "event.ingested"
+type = "eql"
+
+query = '''
+process where host.os.type == "windows" and event.type == "start" and  
+ process.parent.name : ("explorer.exe", "winrar.exe", "7zFM.exe", "Bandizip.exe") and
+  (process.args : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*" or
+   process.executable : "?:\\Users\\*\\AppData\\Local\\Microsoft\\Windows\\INetCache\\IE\\*")
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1566"
+name = "Phishing"
+reference = "https://attack.mitre.org/techniques/T1566/"
+[[rule.threat.technique.subtechnique]]
+id = "T1566.001"
+name = "Spearphishing Attachment"
+reference = "https://attack.mitre.org/techniques/T1566/001/"
+
+
+
+[rule.threat.tactic]
+id = "TA0001"
+name = "Initial Access"
+reference = "https://attack.mitre.org/tactics/TA0001/"

From aef081c85fdd7246293c6e370ce76072e255890e Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Wed, 14 Feb 2024 17:53:04 +0000
Subject: [PATCH 2/2] Update initial_access_execution_from_inetcache.toml

---
 ...initial_access_execution_from_inetcache.toml | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/rules/windows/initial_access_execution_from_inetcache.toml b/rules/windows/initial_access_execution_from_inetcache.toml
index bedcbb5d499..ffbe2992403 100644
--- a/rules/windows/initial_access_execution_from_inetcache.toml
+++ b/rules/windows/initial_access_execution_from_inetcache.toml
@@ -23,7 +23,7 @@ references = [
 risk_score = 73
 rule_id = "dca6b4b0-ae70-44eb-bb7a-ce6db502ee78"
 severity = "high"
-tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
+tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Initial Access", "Tactic: Command and Control", "Data Source: Elastic Endgame", "Data Source: Elastic Defend"]
 timestamp_override = "event.ingested"
 type = "eql"
 
@@ -47,8 +47,21 @@ name = "Spearphishing Attachment"
 reference = "https://attack.mitre.org/techniques/T1566/001/"
 
 
-
 [rule.threat.tactic]
 id = "TA0001"
 name = "Initial Access"
 reference = "https://attack.mitre.org/tactics/TA0001/"
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1105"
+name = "Ingress Tool Transfer"
+reference = "https://attack.mitre.org/techniques/T1105/"
+
+
+[rule.threat.tactic]
+id = "TA0011"
+name = "Command and Control"
+reference = "https://attack.mitre.org/tactics/TA0011/"