[New Rule] Executable File Creation with Multiple Extensions (#881)

* Create defense_evasion_file_creation_mult_extension.toml * spacing * Update rules/windows/defense_evasion_file_creation_mult_extension.toml Co-authored-by: Ross Wolf <31489089+rw-access@users.noreply.github.com> * update query * alignment Co-authored-by: Ross Wolf <31489089+rw-access@users.noreply.github.com>
2021-01-25 13:40:25 -05:00
parent aa409111b8
commit 01c3c718f5
1 changed files with 72 additions and 0 deletions
@@ -0,0 +1,72 @@
+[metadata]
+creation_date = "2021/01/19"
+maturity = "production"
+updated_date = "2021/01/19"
+
+[rule]
+author = ["Elastic"]
+description = """
+Masquerading can allow an adversary to evade defenses and better blend in with the environment. One way it occurs is
+when the name or location of a file is manipulated as a means of tricking a user into executing what they think is a
+benign file type but is actually executable code.
+"""
+from = "now-9m"
+index = ["winlogbeat-*", "logs-endpoint.events.*"]
+language = "eql"
+license = "Elastic License"
+name = "Executable File Creation with Multiple Extensions"
+risk_score = 47
+rule_id = "8b2b3a62-a598-4293-bc14-3d5fa22bb98f"
+severity = "medium"
+tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
+type = "eql"
+
+query = '''
+file where event.type == "creation" and file.extension:"exe" and
+  file.name:
+  (
+    "*.vbs.exe",
+    "*.vbe.exe",
+    "*.bat.exe",
+    "*.js.exe",
+    "*.cmd.exe",
+    "*.wsh.exe",
+    "*.ps1.exe",
+    "*.pdf.exe",
+    "*.docx.exe",
+    "*.doc.exe",
+    "*.xlsx.exe",
+    "*.xls.exe",
+    "*.pptx.exe",
+    "*.ppt.exe",
+    "*.txt.exe",
+    "*.rtf.exe",
+    "*.gif.exe",
+    "*.jpg.exe",
+    "*.png.exe",
+    "*.bmp.exe",
+    "*.hta.exe",
+    "*.txt.exe",
+    "*.img.exe",
+    "*.iso.exe"
+  )
+'''
+
+
+[[rule.threat]]
+framework = "MITRE ATT&CK"
+[[rule.threat.technique]]
+id = "T1036"
+name = "Masquerading"
+reference = "https://attack.mitre.org/techniques/T1036/"
+[[rule.threat.technique.subtechnique]]
+id = "T1036.004"
+name = "Masquerade Task or Service"
+reference = "https://attack.mitre.org/techniques/T1036/004/"
+
+
+
+[rule.threat.tactic]
+id = "TA0005"
+name = "Defense Evasion"
+reference = "https://attack.mitre.org/tactics/TA0005/"