Sigma rule: Wscript Execution from Non C Drive

Rule

Title

Wscript Execution from Non C Drive

Status

deprecated

Level

medium

Author

Aaron Herman

Date

2022/10/01

Modified

2023/08/29

File

deprecated/windows/proc_creation_win_susp_lolbin_non_c_drive.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects Wscript or Cscript executing from a drive other than C. This has been observed with Qakbot executing from within a mounted ISO file.

Log source

product

windows

category

process_creation

Detection

selection_lolbin:
    Image|endswith:
        - '\wscript.exe'
        - '\cscript.exe'
selection_exetensions:
    CommandLine|contains:
        - '.js'
        - '.vbs'
        - '.vbe'
selection_drive_path:
    CommandLine|contains: ':\'
filter_drive_path:
    CommandLine|contains:
        - ' C:\\'
        - " 'C:\\"
        - ' "C:\\'
filter_env_vars:
    CommandLine|contains: '%'
filter_unc_paths:
    CommandLine|contains: ' \\\\'
condition: all of selection_* and not 1 of filter_*

False positives (as the rule lists them)

• Legitimate scripts located on other partitions such as "D:"

Tags

• attack.execution
• attack.t1059

MITRE ATT&CK ids this rule names

• T1059

References

• https://github.com/pr0xylife/Qakbot/blob/main/Qakbot_BB_30.09.2022.txt
• https://app.any.run/tasks/4985c746-601e-401a-9ccf-ae350ac2e887/

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