Persistence via Hidden Run Key Detectededit

Identifies a persistence mechanism that utilizes the NtSetValueKey native API to create a hidden (null terminated) registry key. An adversary may use this method to hide from system utilities such as the Registry Editor (regedit).

Rule type: eql

Rule indices:

  • logs-endpoint.events.*
  • winlogbeat-*
  • logs-windows.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Persistence

Version: 100 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guideedit


Rule queryedit

/* Registry Path ends with backslash */ registry where /*
length(registry.data.strings) > 0 and */ registry.path :
("HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
"HKU\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
"HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
"HKLM\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\
\", "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\Cu
rrentVersion\\Policies\\Explorer\\Run\\", "HKU\\*\\S
oftware\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\
", "HKLM\\Software\\Microsoft\\Windows\\CurrentVersi
on\\Policies\\Explorer\\Run\\")

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 100 (8.5.0 release)
  • Formatting only
Version 7 (8.4.0 release)
  • Updated query, changed from:

    /* Registry Path ends with backslash */ registry where /*
    length(registry.data.strings) > 0 and */ registry.path :
    ("HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
    "HKU\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
    "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
    "HKLM\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\
    \", "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\C
    urrentVersion\\Policies\\Explorer\\Run\\", "HKU\\*\\
    Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\
    \", "HKLM\\Software\\Microsoft\\Windows\\CurrentVers
    ion\\Policies\\Explorer\\Run\\")
Version 5 (8.2.0 release)
  • Formatting only
Version 4 (8.1.0 release)
  • Updated query, changed from:

    /* Registry Path ends with backslash */ registry where /*
    length(registry.data.strings) > 0 and */ registry.path :
    ("HKEY_USERS\\*\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
    "HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\",
    "HKLM\\Software\\WOW6432Node\\Microsoft\\Windows\\CurrentVersion\\Run\
    \", "HKEY_USERS\\*\\Software\\Microsoft\\Windows\\C
    urrentVersion\\Policies\\Explorer\\Run\\", "HKLM\\S
    oftware\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer\\Run\\
    ")
Version 3 (7.12.0 release)
  • Formatting only
Version 2 (7.11.2 release)
  • Formatting only