Sigma rule: HackTool - Jlaive In-Memory Assembly Execution

Rule

Title

HackTool - Jlaive In-Memory Assembly Execution

Status

test

Level

medium

Author

Jose Luis Sanchez Martinez (@Joseliyo_Jstnk)

Date

2022-05-24

Modified

2023-02-22

File

rules/windows/process_creation/proc_creation_win_hktl_jlaive_batch_execution.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the use of Jlaive to execute assemblies in a copied PowerShell

Log source

product

windows

category

process_creation

Detection

parent_selection:
    ParentImage|endswith: '\cmd.exe'
    ParentCommandLine|endswith: '.bat'
selection1:
    Image|endswith: '\xcopy.exe'
    CommandLine|contains|all:
        - 'powershell.exe'
        - '.bat.exe'
selection2:
    Image|endswith: '\xcopy.exe'
    CommandLine|contains|all:
        - 'pwsh.exe'
        - '.bat.exe'
selection3:
    Image|endswith: '\attrib.exe'
    CommandLine|contains|all:
        - '+s'
        - '+h'
        - '.bat.exe'
condition: parent_selection and (1 of selection*)

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution
• attack.t1059.003

MITRE ATT&CK ids this rule names

• T1059.003

References

• https://jstnk9.github.io/jstnk9/research/Jlaive-Antivirus-Evasion-Tool
• https://web.archive.org/web/20220514073704/https://github.com/ch2sh/Jlaive

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_hktl_jlaive_batch_execution.yml