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Process Spawn Analysis

D3-PSA
D3-PSA (Process Spawn Analysis)

Definition

Analyzing spawn arguments or attributes of a process to detect processes that are unauthorized.

How it works

Process attributes are established when an operating system spawns a new process. These attributes are analyzed to look for the presence or absence of specific values or patterns.

Some attributes of interest are:

  • user
  • process name
  • image path
  • security content

Considerations

  • Attackers can spoof the parent process identifier (PPID), which could bypass this defense to allow execution of a malicious process from an arbitrary parent process.
  • Attackers could have legitimately compromised any of the process properties, such as the user, to make the execution appear legitimate.
  • Location: If the full image path is not checked, there could be a conflict with an executable that appears earlier due to resolution involving the system environment path/classpath variable.
  • Parsing issues: If the raw command from a shell is analyzed, rather than the actual function call, it is important to identify the actual command being run from its arguments. In Windows, services with unquoted file paths containing spaces will try to use the first token as the executable and the rest as arguments -- and shift tokens to the executable until a valid one is found.
  • Some operating systems can spawn processes without forking.
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Technique Subclasses

There are 2 techniques in this category, Process Spawn Analysis.

Name ID Definition Synonyms
Process Spawn Analysis D3-PSA Analyzing spawn arguments or attributes of a process to detect processes that are unauthorized.
- Process Lineage Analysis D3-PLA Identification of suspicious processes executing on an end-point device by examining the ancestry and siblings of a process, and the associated metadata of each node on the tree, such as process execution, duration, and order relative to siblings and ancestors. Process Tree Analysis
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References

All
External Knowledge Base

The following references were used to develop the Process Spawn Analysis knowledge-base article.

(Note: the consideration of references does not imply specific functionality exists in an offering.)

CAR-2019-08-002: Active Directory Dumping via NTDSUtil

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2019-08-002/

CAR-2020-04-001: Shadow Copy Deletion

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-04-001/

CAR-2020-05-003: Rare LolBAS Command Lines

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-05-003/

CAR-2020-08-001: NTFS Alternate Data Stream Execution - System Utilities

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-08-001/

CAR-2020-09-003: Indicator Blocking - Driver Unloaded

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-09-003/

CAR-2020-09-004: Credentials in Files & Registry

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-09-004/

CAR-2020-11-001: Boot or Logon Initialization Scripts

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-001/

CAR-2020-11-003: DLL Injection with Mavinject

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-003/

CAR-2020-11-005: Clear Powershell Console Command History

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-005/

CAR-2020-11-006: Local Permission Group Discovery

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-006/

CAR-2020-11-007: Network Share Connection Removal

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-007/

CAR-2020-11-008: MSBuild and msxsl

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-008/

CAR-2020-11-009: Compiled HTML Access

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2020-11-009/

CAR-2021-01-002: Unusually Long Command Line Strings

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-002/

CAR-2021-01-003: Clearing Windows Logs with Wevtutil

Reference Type: External Knowledge Base Organization: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-003/

CAR-2021-01-004: Unusual Child Process for Spoolsv.Exe or Connhost.Exe

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-004/

CAR-2021-01-006: Unusual Child Process spawned using DDE exploit

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-006/

CAR-2021-01-007: Detecting Tampering of Windows Defender Command Prompt

MITRE Comments

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Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-007/

CAR-2021-01-008: Disable UAC

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-008/

CAR-2021-01-009: Detecting Shadow Copy Deletion via Vssadmin.exe

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-01-009/

CAR-2021-02-001: Webshell-Indicative Process Tree

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-02-001/

CAR-2021-04-001: Common Windows Process Masquerading

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-04-001/

CAR-2021-05-001: Attempt To Add Certificate To Untrusted Store

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-001/

CAR-2021-05-002: Batch File Write to System32

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-002/

CAR-2021-05-003: BCDEdit Failure Recovery Modification

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-003/

CAR-2021-05-004: BITS Job Persistence

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-004/

CAR-2021-05-005: BITSAdmin Download File

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-005/

CAR-2021-05-006: CertUtil Download With URLCache and Split Arguments

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-006/

CAR-2021-05-007: CertUtil Download With VerifyCtl and Split Arguments

Reference Type: External Knowledge Base
Source:
https://car.mitre.org/analytics/CAR-2021-05-007/

CAR-2021-05-008: Certutil exe certificate extraction

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-008/

CAR-2021-05-009: CertUtil With Decode Argument

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-009/

CAR-2021-05-010: Create local admin accounts using net exe

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2021-05-010/

CAR-2013-07-005: Command Line Usage of Archiving Software

Reference Type: External Knowledge Base
Source:
https://car.mitre.org/analytics/CAR-2013-07-005/

CAR-2016-03-002: Create Remote Process via WMIC

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2016-03-002/

CAR-2019-04-004: Credential Dumping via Mimikatz

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2019-04-004/

CAR-2016-03-001: Host Discovery Commands

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2016-03-001/

CAR-2019-07-002: Lsass Process Dump via Procdump

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2019-07-002/

CAR-2014-04-003: Powershell Execution

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2014-04-003/

CAR-2014-03-006: RunDLL32.exe monitoring

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2014-03-006/

CAR-2019-04-003: Squiblydoo

Reference Type: External Knowledge Base Organization: MITRE Author: MITRE
Source:
https://car.mitre.org/analytics/CAR-2019-04-003/

CAR-2013-07-001: Suspicious Arguments

Reference Type: External Knowledge Base
Source:
https://car.mitre.org/analytics/CAR-2013-07-001/

CAR-2013-05-002: Suspicious Run Locations

Reference Type: External Knowledge Base
Source:
https://car.mitre.org/analytics/CAR-2013-05-002/

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