IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Potential Process Injection from Malicious Documentedit
Identifies child processes of frequently targeted Microsoft Office applications (Word, PowerPoint, Excel) with unusual process arguments and path. This behavior is often observed during exploitation of Office applications or from documents with malicious macros.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: low
Risk score: 21
Runs every: 60m
Searches indices from: now-119m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Defense Evasion
- Tactic: Privilege Escalation
- Tactic: Initial Access
- Rule Type: BBR
- Data Source: Elastic Defend
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
process where host.os.type == "windows" and event.action == "start" and
process.parent.name : ("excel.exe", "powerpnt.exe", "winword.exe") and
process.args_count == 1 and
process.executable : (
"?:\\Windows\\SysWOW64\\*.exe", "?:\\Windows\\system32\\*.exe"
) and
not (process.executable : "?:\\Windows\\System32\\spool\\drivers\\x64\\*" and
process.code_signature.trusted == true and not process.code_signature.subject_name : "Microsoft *") and
not process.executable : (
"?:\\Windows\\Sys*\\Taskmgr.exe",
"?:\\Windows\\Sys*\\ctfmon.exe",
"?:\\Windows\\System32\\notepad.exe")
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/
-
Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
-
Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/
-
Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
-
Technique:
- Name: Phishing
- ID: T1566
- Reference URL: https://attack.mitre.org/techniques/T1566/
-
Sub-technique:
- Name: Spearphishing Attachment
- ID: T1566.001
- Reference URL: https://attack.mitre.org/techniques/T1566/001/