Suspicious Extrac32 Alternate Data Stream Execution

Hunt Hypothesis

Extract data from cab file and hide it in an alternate data stream

Detection Rule

Sigma (Original)

title: Suspicious Extrac32 Alternate Data Stream Execution
id: 4b13db67-0c45-40f1-aba8-66a1a7198a1e
status: test
description: Extract data from cab file and hide it in an alternate data stream
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Extrac32/
author: frack113
date: 2021-11-26
modified: 2022-12-30
tags:
    - attack.stealth
    - attack.t1564.004
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - extrac32.exe
            - .cab
        CommandLine|re: ':[^\\]'
    condition: selection
falsepositives:
    - Unknown
level: medium

KQL (Azure Sentinel)

imProcessCreate
| where (TargetProcessCommandLine contains "extrac32.exe" and TargetProcessCommandLine contains ".cab") and TargetProcessCommandLine matches regex ":[^\\\\]"

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Technique: T1564.004 — T1564.004

References

• https://lolbas-project.github.io/lolbas/Binaries/Extrac32/
• SigmaHQ Rule