Potentially Suspicious Regsvr32 HTTP IP Pattern

testhigh
log source: windows · process_creationauthor Florian Roth (Nextron Systems)date 2022-01-11
01

description

What this is, in brief.

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

02

tags

attack.stealthattack.t1218.010
03

rule source (YAML)

title: Potentially Suspicious Regsvr32 HTTP IP Pattern
id: 2dd2c217-bf68-437a-b57c-fe9fd01d5de8
status: test
description: Detects regsvr32 execution to download and install DLLs located remotely where the address is an IP address.
references:
    - https://twitter.com/mrd0x/status/1461041276514623491
    - https://twitter.com/tccontre18/status/1480950986650832903
    - https://lolbas-project.github.io/lolbas/Binaries/Regsvr32/
author: Florian Roth (Nextron Systems)
date: 2022-01-11
modified: 2023-05-24
tags:
    - attack.stealth
    - attack.t1218.010
logsource:
    category: process_creation
    product: windows
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_*
falsepositives:
    - FQDNs that start with a number such as "7-Zip"
level: high
04

detects techniques (1)

ATT&CK techniques this enables or maps to.

05

references

External citations — patches, advisories, analysis.