Suspicious Extrac32 Alternate Data Stream Execution

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

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

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1564.004` Hide Artifacts: NTFS File Attributes

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    CommandLine|contains|all:
        - extrac32.exe
        - .cab
    CommandLine|re: ':[^\\]'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`.cab` corpus 5 (sigma 5) `extrac32.exe` corpus 2 (sigma 2)	`field:"CommandLine" kind:match`
`CommandLine`	regex_match	`:[^\]` corpus 2 (sigma 2)	`field:"CommandLine" kind:regex_match value:":[^\]"`

Suspicious Extrac32 Alternate Data Stream Execution

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`