Sigma rule: ISO File Created Within Temp Folders

Rule

Title

ISO File Created Within Temp Folders

Status

test

Level

high

Author

@sam0x90

Date

2022-07-30

File

rules/windows/file/file_event/file_event_win_iso_file_mount.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

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.

Log source

product

windows

category

file_event

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*

False positives (as the rule lists them)

• Potential FP by sysadmin opening a zip file containing a legitimate ISO file

Tags

• attack.initial-access
• attack.t1566.001

MITRE ATT&CK ids this rule names

• T1566.001

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

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_iso_file_mount.yml