Potential KamiKakaBot Activity - Lure Document Execution

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: Nasreddine Bencherchali (Nextron Systems), X__Junior (Nextron Systems)
Source: github.com/SigmaHQ/sigma

Detects the execution of a Word document via the WinWord Start Menu shortcut. This behavior was observed being used by KamiKakaBot samples in order to initiate the 2nd stage of the infection.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

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: Potential KamiKakaBot Activity - Lure Document Execution
id: 24474469-bd80-46cc-9e08-9fbe81bfaaca
status: test
description: |
    Detects the execution of a Word document via the WinWord Start Menu shortcut.
    This behavior was observed being used by KamiKakaBot samples in order to initiate the 2nd stage of the infection.
references:
    - https://www.nextron-systems.com/2024/03/22/unveiling-kamikakabot-malware-analysis/
author: Nasreddine Bencherchali (Nextron Systems), X__Junior (Nextron Systems)
date: 2024-03-22
tags:
    - attack.execution
    - attack.t1059
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\cmd.exe'
        CommandLine|contains|all:
            - '/c '
            - '.lnk ~'
            - 'Start Menu\Programs\Word'
        CommandLine|endswith: '.doc'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: '\cmd.exe'
    CommandLine|contains|all:
        - '/c '
        - '.lnk ~'
        - 'Start Menu\Programs\Word'
    CommandLine|endswith: '.doc'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	ends_with	`.doc`	`field:"CommandLine" kind:ends_with value:".doc"`
`CommandLine`	match	`.lnk ~` `/c` corpus 4 (sigma 4) `Start Menu\Programs\Word`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\cmd.exe` corpus 130 (sigma 130)	`field:"Image" kind:ends_with value:"\cmd.exe"`