Potential Suspicious File Edit
editPotential Suspicious File Edit
editThis rule monitors for the potential edit of a suspicious file. In Linux, when editing a file through an editor, a temporary .swp file is created. By monitoring for the creation of this .swp file, we can detect potential file edits of suspicious files. The execution of this rule is not a clear sign of the file being edited, as just opening the file through an editor will trigger this event. Attackers may alter any of the files added in this rule to establish persistence, escalate privileges or perform reconnaisance on the system.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
- endgame-*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 1
References: None
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Persistence
- Tactic: Privilege Escalation
- Data Source: Elastic Endgame
- Data Source: Elastic Defend
Version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editfile where host.os.type == "linux" and event.action in ("creation", "file_create_event") and file.extension == "swp" and
file.path : (
/* common interesting files and locations */
"/etc/.shadow.swp", "/etc/.shadow-.swp", "/etc/.shadow~.swp", "/etc/.gshadow.swp", "/etc/.gshadow-.swp",
"/etc/.passwd.swp", "/etc/.pwd.db.swp", "/etc/.master.passwd.swp", "/etc/.spwd.db.swp", "/etc/security/.opasswd.swp",
"/etc/.environment.swp", "/etc/.profile.swp", "/etc/sudoers.d/.*.swp", "/etc/ld.so.conf.d/.*.swp",
"/etc/init.d/.*.swp", "/etc/.rc.local.swp", "/etc/rc*.d/.*.swp", "/dev/shm/.*.swp", "/etc/update-motd.d/.*.swp",
"/usr/lib/update-notifier/.*.swp",
/* service, timer, want, socket and lock files */
"/etc/systemd/system/.*.swp", "/usr/local/lib/systemd/system/.*.swp", "/lib/systemd/system/.*.swp",
"/usr/lib/systemd/system/.*.swp","/home/*/.config/systemd/user/.*.swp", "/run/.*.swp", "/var/run/.*.swp/",
/* profile and shell configuration files */
"/home/*.profile.swp", "/home/*.bash_profile.swp", "/home/*.bash_login.swp", "/home/*.bashrc.swp", "/home/*.bash_logout.swp",
"/home/*.zshrc.swp", "/home/*.zlogin.swp", "/home/*.tcshrc.swp", "/home/*.kshrc.swp", "/home/*.config.fish.swp",
"/root/*.profile.swp", "/root/*.bash_profile.swp", "/root/*.bash_login.swp", "/root/*.bashrc.swp", "/root/*.bash_logout.swp",
"/root/*.zshrc.swp", "/root/*.zlogin.swp", "/root/*.tcshrc.swp", "/root/*.kshrc.swp", "/root/*.config.fish.swp"
)
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
-
Technique:
- Name: Boot or Logon Initialization Scripts
- ID: T1037
- Reference URL: https://attack.mitre.org/techniques/T1037/
-
Sub-technique:
- Name: RC Scripts
- ID: T1037.004
- Reference URL: https://attack.mitre.org/techniques/T1037/004/
-
Technique:
- Name: Create or Modify System Process
- ID: T1543
- Reference URL: https://attack.mitre.org/techniques/T1543/
-
Sub-technique:
- Name: Systemd Service
- ID: T1543.002
- Reference URL: https://attack.mitre.org/techniques/T1543/002/
-
Technique:
- Name: Hijack Execution Flow
- ID: T1574
- Reference URL: https://attack.mitre.org/techniques/T1574/
-
Sub-technique:
- Name: Dynamic Linker Hijacking
- ID: T1574.006
- Reference URL: https://attack.mitre.org/techniques/T1574/006/
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Abuse Elevation Control Mechanism
- ID: T1548
- Reference URL: https://attack.mitre.org/techniques/T1548/
-
Sub-technique:
- Name: Sudo and Sudo Caching
- ID: T1548.003
- Reference URL: https://attack.mitre.org/techniques/T1548/003/