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Detection rules › Sigma

Import LDAP Data Interchange Format File Via Ldifde.EXE

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

Detects the execution of "Ldifde.exe" with the import flag "-i". The can be abused to include HTTP-based arguments which will allow the arbitrary download of files from a remote server.

MITRE ATT&CK coverage

TacticTechniques
StealthT1218 System Binary Proxy Execution
Command & ControlT1105 Ingress Tool Transfer

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation

Rule body yaml

title: Import LDAP Data Interchange Format File Via Ldifde.EXE
id: 6f535e01-ca1f-40be-ab8d-45b19c0c8b7f
status: test
description: |
    Detects the execution of "Ldifde.exe" with the import flag "-i". The can be abused to include HTTP-based arguments which will allow the arbitrary download of files from a remote server.
references:
    - https://twitter.com/0gtweet/status/1564968845726580736
    - https://strontic.github.io/xcyclopedia/library/ldifde.exe-979DE101F5059CEC1D2C56967CA2BAC0.html
    - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/cc731033(v=ws.11)
author: '@gott_cyber'
date: 2022-09-02
modified: 2023-03-14
tags:
    - attack.command-and-control
    - attack.stealth
    - attack.t1218
    - attack.t1105
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\ldifde.exe'
        - OriginalFileName: 'ldifde.exe'
    selection_cli:
        CommandLine|contains|all:
            - '-i'
            - '-f'
    condition: all of selection_*
falsepositives:
    - Since the content of the files are unknown, false positives are expected
level: medium

Stages and Predicates

Stage 0: condition

all of selection_*

Stage 1: selection_img

selection_img:
    - Image|endswith: '\ldifde.exe'
    - OriginalFileName: 'ldifde.exe'

Stage 2: selection_cli

selection_cli:
    CommandLine|contains|all:
        - '-i'
        - '-f'

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
CommandLinematch
  • -f corpus 9 (sigma 7, splunk 2)
  • -i corpus 7 (sigma 7)
Imageends_with
  • \ldifde.exe corpus 4 (sigma 4)
OriginalFileNameeq
  • ldifde.exe corpus 2 (sigma 2)