From 6dc78c4703798620bcb51e7e1f78e046aa4c3d32 Mon Sep 17 00:00:00 2001
From: Samirbous <64742097+Samirbous@users.noreply.github.com>
Date: Tue, 8 Dec 2020 12:37:51 +0100
Subject: [PATCH] [New Rule] Remote File Download via Scripting (#647)

* [New Rule] Remote File Download via Scripting

* Update rules/windows/command_and_control_remote_file_copy_scripts.toml

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

* Update rules/windows/command_and_control_remote_file_copy_scripts.toml

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

* eql syntax

* ecs_version

* Update rules/windows/command_and_control_remote_file_copy_scripts.toml

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

* relinted

* deleted ecs_version

Co-authored-by: Brent Murphy <56412096+bm11100@users.noreply.github.com>
Co-authored-by: Justin Ibarra <brokensound77@users.noreply.github.com>
---
 ..._and_control_remote_file_copy_scripts.toml | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 rules/windows/command_and_control_remote_file_copy_scripts.toml

diff --git a/rules/windows/command_and_control_remote_file_copy_scripts.toml b/rules/windows/command_and_control_remote_file_copy_scripts.toml
new file mode 100644
index 000000000..69aa34be0
--- /dev/null
+++ b/rules/windows/command_and_control_remote_file_copy_scripts.toml
@@ -0,0 +1,44 @@
+[metadata]
+creation_date = "2020/11/29"
+maturity = "production"
+updated_date = "2020/11/29"
+
+[rule]
+author = ["Elastic"]
+description = """
+Identifies built-in Windows script interpreters (cscript.exe or wscript.exe) being used to download an executable file
+from a remote destination.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Remote File Download via Script Interpreter"
+risk_score = 43
+rule_id = "1d276579-3380-4095-ad38-e596a01bc64f"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Command and Control"]
+type = "eql"
+
+query = '''
+sequence by host.id, process.entity_id
+  [network where process.name : ("wscript.exe", "cscript.exe") and network.protocol != "dns" and
+   network.direction == "outgoing" and network.type == "ipv4" and destination.ip != "127.0.0.1"
+  ]
+  [file where event.type == "creation" and file.extension : ("exe", "dll")]
+'''
+
+
+[[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/"
+