Sigma rule: Unmount Share Via Net.EXE

Rule

Title

Unmount Share Via Net.EXE

Status

test

Level

low

Author

oscd.community, @redcanary, Zach Stanford @svch0st

Date

2020-10-08

Modified

2023-02-21

File

rules/windows/process_creation/proc_creation_win_net_share_unmount.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when when a mounted share is removed. Adversaries may remove share connections that are no longer useful in order to clean up traces of their operation

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith:
          - '\net.exe'
          - '\net1.exe'
    - OriginalFileName:
          - 'net.exe'
          - 'net1.exe'
selection_cli:
    CommandLine|contains|all:
        - 'share'
        - '/delete'
condition: all of selection*

False positives (as the rule lists them)

• Administrators or Power users may remove their shares via cmd line

Tags

• attack.stealth
• attack.t1070.005

MITRE ATT&CK ids this rule names

• T1070.005

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.005/T1070.005.md

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_net_share_unmount.yml