Suspicious ZipExec Execution

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

ZipExec is a Proof-of-Concept (POC) tool to wrap binary-based tools into a password-protected zip file.

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1202` Indirect Command Execution `T1218` System Binary Proxy Execution

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 ZipExec Execution
id: 90dcf730-1b71-4ae7-9ffc-6fcf62bd0132
status: test
description: ZipExec is a Proof-of-Concept (POC) tool to wrap binary-based tools into a password-protected zip file.
references:
    - https://twitter.com/SBousseaden/status/1451237393017839616
    - https://github.com/Tylous/ZipExec
author: frack113
date: 2021-11-07
modified: 2022-12-25
tags:
    - attack.execution
    - attack.stealth
    - attack.t1218
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    run:
        CommandLine|contains|all:
            - '/generic:Microsoft_Windows_Shell_ZipFolder:filename='
            - '.zip'
            - '/pass:'
            - '/user:'
    delete:
        CommandLine|contains|all:
            - '/delete'
            - 'Microsoft_Windows_Shell_ZipFolder:filename='
            - '.zip'
    condition: run or delete
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

run or delete

Stage 1: `run`

run:
    CommandLine|contains|all:
        - '/generic:Microsoft_Windows_Shell_ZipFolder:filename='
        - '.zip'
        - '/pass:'
        - '/user:'

Stage 2: `delete`

delete:
    CommandLine|contains|all:
        - '/delete'
        - 'Microsoft_Windows_Shell_ZipFolder:filename='
        - '.zip'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`.zip` corpus 6 (sigma 5, chronicle 1) `/delete` corpus 8 (sigma 6, splunk 2) `/generic:Microsoft_Windows_Shell_ZipFolder:filename=` `/pass:` corpus 2 (sigma 2) `/user:` corpus 7 (sigma 5, splunk 2) `Microsoft_Windows_Shell_ZipFolder:filename=`	`field:"CommandLine" kind:match`

Suspicious ZipExec Execution

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: run

Stage 2: delete

Indicators

Stage 0: `condition`

Stage 1: `run`

Stage 2: `delete`