From b6ed215958c7685ca3d53cb969f7fa599d08e3f4 Mon Sep 17 00:00:00 2001
From: Ruben Groenewoud <78494512+Aegrah@users.noreply.github.com>
Date: Thu, 31 Aug 2023 17:32:17 +0200
Subject: [PATCH] [New Rule] File Creation, Exec and Self-Deletion (#3045)

* [New Rule] File Creation, Exec and Self-Deletion

* Update execution_file_execution_followed_by_deletion.toml

* Update execution_file_execution_followed_by_deletion.toml

* Update execution_file_execution_followed_by_deletion.toml

* Update execution_file_execution_followed_by_deletion.toml

---------

Co-authored-by: Samirbous <64742097+Samirbous@users.noreply.github.com>
---
 ...n_file_execution_followed_by_deletion.toml | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 rules/linux/execution_file_execution_followed_by_deletion.toml

diff --git a/rules/linux/execution_file_execution_followed_by_deletion.toml b/rules/linux/execution_file_execution_followed_by_deletion.toml
new file mode 100644
index 000000000..64b8c70bb
--- /dev/null
+++ b/rules/linux/execution_file_execution_followed_by_deletion.toml
@@ -0,0 +1,55 @@
+[metadata]
+creation_date = "2023/08/28"
+integration = ["endpoint"]
+maturity = "production"
+min_stack_comments = "New fields added: required_fields, related_integrations, setup"
+min_stack_version = "8.3.0"
+updated_date = "2023/08/28"
+
+[rule]
+author = ["Elastic"]
+description = """
+This rule monitors for the creation of a file, followed by its execution and self-deletion in a short timespan within a
+directory often used for malicious purposes by threat actors. This behavior is often used by malware to execute 
+malicious code and delete itself to hide its tracks.
+"""
+from = "now-9m"
+index = ["logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License v2"
+name = "File Creation, Execution and Self-Deletion in Suspicious Directory"
+risk_score = 47
+rule_id = "09bc6c90-7501-494d-b015-5d988dc3f233"
+severity = "medium"
+tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Defend"]
+type = "eql"
+query = '''
+sequence by host.id, user.id with maxspan=1m
+  [file where host.os.type == "linux" and event.action == "creation" and 
+   process.name in ("curl", "wget", "fetch", "ftp", "sftp", "scp", "rsync", "ld") and 
+   file.path : ("/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*",
+     "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*")] by file.name
+  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and 
+   process.parent.name in ("bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")] by process.name
+  [file where host.os.type == "linux" and event.action == "deletion" and not process.name in ("rm", "ld") and 
+   file.path : ("/dev/shm/*", "/run/shm/*", "/tmp/*", "/var/tmp/*",
+     "/run/*", "/var/run/*", "/var/www/*", "/proc/*/fd/*")] by file.name
+'''
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+
+[[rule.threat.technique]]
+id = "T1059"
+name = "Command and Scripting Interpreter"
+reference = "https://attack.mitre.org/techniques/T1059/"
+
+[[rule.threat.technique.subtechnique]]
+id = "T1059.004"
+name = "Unix Shell"
+reference = "https://attack.mitre.org/techniques/T1059/004/"
+
+[rule.threat.tactic]
+id = "TA0002"
+name = "Execution"
+reference = "https://attack.mitre.org/tactics/TA0002/"