Malicious DLL File Dropped in the Teams or OneDrive Folder — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: high. Source dates: 2022-08-12 / not supplied.

{
  "category": "file_event",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: fb7afaf658d7cf8f64ba16029f0af40e327abcc42b81c12ba8c420ffc62eb3d2

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Malicious DLL File Dropped in the Teams or OneDrive Folder
id: 1908fcc1-1b92-4272-8214-0fbaf2fa5163
status: test
description: |
    Detects creation of a malicious DLL file in the location where the OneDrive or Team applications
    Upon execution of the Teams or OneDrive application, the dropped malicious DLL file ("iphlpapi.dll") is sideloaded
references:
    - https://blog.cyble.com/2022/07/27/targeted-attacks-being-carried-out-via-dll-sideloading/
author: frack113
date: 2022-08-12
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|contains|all:
            - 'iphlpapi.dll'
            - '\AppData\Local\Microsoft'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://blog.cyble.com/2022/07/27/targeted-attacks-being-carried-out-via-dll-sideloading/