ISO File Created Within Temp Folders

Description

Detects the creation of a ISO file in the Outlook temp folder or in the Appdata temp folder. Typical of Qakbot TTP from end-July 2022.

Query · sigma

selection_1:
  TargetFilename|contains|all:
  - \AppData\Local\Temp\
  - .zip\
  TargetFilename|endswith: .iso
selection_2:
  TargetFilename|contains: \AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\
  TargetFilename|endswith: .iso
condition: 1 of selection*

Known false positives

  • Potential FP by sysadmin opening a zip file containing a legitimate ISO file
Raw source ISO File Created Within Temp Folders · Sigma
Esc
Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: ISO File Created Within Temp Folders
id: 2f9356ae-bf43-41b8-b858-4496d83b2acb
status: test
description: Detects the creation of a ISO file in the Outlook temp folder or in the Appdata temp folder. Typical of Qakbot TTP from end-July 2022.
references:
    - https://twitter.com/Sam0x90/status/1552011547974696960
    - https://securityaffairs.co/wordpress/133680/malware/dll-sideloading-spread-qakbot.html
    - https://github.com/redcanaryco/atomic-red-team/blob/0f229c0e42bfe7ca736a14023836d65baa941ed2/atomics/T1553.005/T1553.005.md#atomic-test-1---mount-iso-image
author: '@sam0x90'
date: 2022-07-30
tags:
    - attack.initial-access
    - attack.t1566.001
logsource:
    category: file_event
    product: windows
detection:
    selection_1:
        TargetFilename|contains|all:
            - '\AppData\Local\Temp\'
            - '.zip\'
        TargetFilename|endswith: '.iso'
    selection_2:
        TargetFilename|contains: '\AppData\Local\Microsoft\Windows\INetCache\Content.Outlook\'
        TargetFilename|endswith: '.iso'
    condition: 1 of selection*
falsepositives:
    - Potential FP by sysadmin opening a zip file containing a legitimate ISO file
level: high

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.