Sigma rule: Potentially Suspicious Regsvr32 HTTP IP Pattern

Rule

Title

Potentially Suspicious Regsvr32 HTTP IP Pattern

Status

test

Level

high

Author

Florian Roth (Nextron Systems)

Date

2022-01-11

Modified

2023-05-24

File

rules/windows/process_creation/proc_creation_win_regsvr32_http_ip_pattern.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects regsvr32 execution to download and install DLLs located remotely where the address is an IP address.

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith: '\regsvr32.exe'
    - OriginalFileName: 'REGSVR32.EXE'
selection_ip:
    CommandLine|contains:
        - ' /i:http://1'
        - ' /i:http://2'
        - ' /i:http://3'
        - ' /i:http://4'
        - ' /i:http://5'
        - ' /i:http://6'
        - ' /i:http://7'
        - ' /i:http://8'
        - ' /i:http://9'
        - ' /i:https://1'
        - ' /i:https://2'
        - ' /i:https://3'
        - ' /i:https://4'
        - ' /i:https://5'
        - ' /i:https://6'
        - ' /i:https://7'
        - ' /i:https://8'
        - ' /i:https://9'
        - ' -i:http://1'
        - ' -i:http://2'
        - ' -i:http://3'
        - ' -i:http://4'
        - ' -i:http://5'
        - ' -i:http://6'
        - ' -i:http://7'
        - ' -i:http://8'
        - ' -i:http://9'
        - ' -i:https://1'
        - ' -i:https://2'
        - ' -i:https://3'
        - ' -i:https://4'
        - ' -i:https://5'
        - ' -i:https://6'
        - ' -i:https://7'
        - ' -i:https://8'
        - ' -i:https://9'
condition: all of selection_*

False positives (as the rule lists them)

• FQDNs that start with a number such as "7-Zip"

Tags

• attack.stealth
• attack.t1218.010

MITRE ATT&CK ids this rule names

• T1218.010

References

• https://twitter.com/mrd0x/status/1461041276514623491
• https://twitter.com/tccontre18/status/1480950986650832903
• https://lolbas-project.github.io/lolbas/Binaries/Regsvr32/

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_regsvr32_http_ip_pattern.yml