Sigma rule: Potential Devil Bait Related Indicator

Rule

Title

Potential Devil Bait Related Indicator

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-05-15

File

rules-emerging-threats/2021/Malware/Devil-Bait/file_event_win_malware_devil_bait_script_drop.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of ".xml" and ".txt" files in folders of the "\AppData\Roaming\Microsoft" directory by uncommon processes. This behavior was seen common across different Devil Bait samples and stages as described by the NCSC

Log source

product

windows

category

file_event

Detection

selection:
    Image|endswith:
        - '\schtasks.exe'
        - '\wscript.exe'
        - '\mshta.exe'
    # Example folders used by the samples include:
    #   - %AppData%\Microsoft\Network\
    #   - %AppData%\Microsoft\Office\
    TargetFilename|contains: '\AppData\Roaming\Microsoft\'
    TargetFilename|endswith:
        - '.txt'
        - '.xml'
condition: selection

False positives (as the rule lists them)

• Unlikely

Tags

• detection.emerging-threats
• attack.stealth

References

• https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/devil-bait/NCSC-MAR-Devil-Bait.pdf

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Devil-Bait/file_event_win_malware_devil_bait_script_drop.yml