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Detection rules › Sigma

Ie4uinit Lolbin Use From Invalid Path

Status
test
Severity
medium
Log source
product windows, category process_creation
Author
frack113
Source
github.com/SigmaHQ/sigma

Detect use of ie4uinit.exe to execute commands from a specially prepared ie4uinit.inf file from a directory other than the usual directories

MITRE ATT&CK coverage

TacticTechniques
StealthT1218 System Binary Proxy Execution

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation

Rule body yaml

title: Ie4uinit Lolbin Use From Invalid Path
id: d3bf399f-b0cf-4250-8bb4-dfc192ab81dc
status: test
description: Detect use of ie4uinit.exe to execute commands from a specially prepared ie4uinit.inf file from a directory other than the usual directories
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Ie4uinit/
    - https://bohops.com/2018/03/10/leveraging-inf-sct-fetch-execute-techniques-for-bypass-evasion-persistence-part-2/
author: frack113
date: 2022-05-07
modified: 2022-05-16
tags:
    - attack.stealth
    - attack.t1218
logsource:
    product: windows
    category: process_creation
detection:
    lolbin:
        - Image|endswith: '\ie4uinit.exe'
        - OriginalFileName: 'IE4UINIT.EXE'
    filter_correct:
        CurrentDirectory:
            - 'c:\windows\system32\'
            - 'c:\windows\sysWOW64\'
    filter_missing:
        CurrentDirectory: null
    condition: lolbin and not 1 of filter_*
falsepositives:
    - ViberPC updater calls this binary with the following commandline "ie4uinit.exe -ClearIconCache"
level: medium

Stages and Predicates

Stage 0: condition

lolbin and not 1 of filter_*

Stage 1: lolbin

lolbin:
    - Image|endswith: '\ie4uinit.exe'
    - OriginalFileName: 'IE4UINIT.EXE'

Stage 2: not filter_*

filter_correct:
    CurrentDirectory:
        - 'c:\windows\system32\'
        - 'c:\windows\sysWOW64\'
filter_missing:
    CurrentDirectory: null

Exclusions

Top-level NOT(...) conjuncts: predicates this rule actively suppresses.

FieldKindExcluded values
CurrentDirectoryeqc:\windows\sysWOW64\
CurrentDirectoryeqc:\windows\system32\
CurrentDirectoryis_null(no value, null check)

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Imageends_with
  • \ie4uinit.exe
OriginalFileNameeq
  • IE4UINIT.EXE corpus 2 (sigma 2)