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Detection rules › Sigma

Potential In-Memory Download And Compile Of Payloads

Status
test
Severity
medium
Log source
category process_creation, product macos
Author
Sohan G (D4rkCiph3r), Red Canary (idea)
Source
github.com/SigmaHQ/sigma

Detects potential in-memory downloading and compiling of applets using curl and osacompile as seen used by XCSSET malware

MITRE ATT&CK coverage

TacticTechniques
Execution
Command & Control

Telemetry coverage

PlatformRecord / event type
macOSESF event exec (NOTIFY): Fires after execve(2) or posix_spawn(2) succeeds, delivering a post-fact record of the new process.

Rule body

title: Potential In-Memory Download And Compile Of Payloads
id: 13db8d2e-7723-4c2c-93c1-a4d36994f7ef
status: test
description: Detects potential in-memory downloading and compiling of applets using curl and osacompile as seen used by XCSSET malware
references:
    - https://redcanary.com/blog/mac-application-bundles/
author: Sohan G (D4rkCiph3r), Red Canary (idea)
date: 2023-08-22
tags:
    - attack.command-and-control
    - attack.execution
    - attack.t1059.007
    - attack.t1105
logsource:
    category: process_creation
    product: macos
detection:
    selection:
        CommandLine|contains|all:
            - 'osacompile'
            - 'curl'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    CommandLine|contains|all:
        - 'osacompile'
        - 'curl'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
CommandLinematch
  • curl
  • osacompile
field:"CommandLine" kind:match