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MediumSigmaHQ Nasreddine Bencherchali (Nextron Systems) +1

Potentially Suspicious Desktop Background Change Via Registry

Detects registry value settings that would replace the user's desktop background. This is a common technique used by malware to change the desktop background to a ransom note or other image.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: windows
Log source category: registry_set

Known benign triggers

Administrative scripts that change the desktop background to a company logo or other image.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.ControlPanelDisplay::CPL_Personalization_NoDesktopBackgroundUI	Unclassified	2
admx.help/?Category=Windows_10_2016&Policy=Microsoft.Policies.WindowsDesktop::Wallpaper	Unclassified	2
research.checkpoint.com/2023/the-rhysida-ransomware-activity-analysis-and-ties-to-vice-society/	Unclassified	2
www.attackiq.com/2023/09/20/emulating-rhysida/	Unclassified	2
www.trendmicro.com/en_us/research/23/h/an-overview-of-the-new-rhysida-ransomware.html	Threat report	2
www.virustotal.com/gui/file/a864282fea5a536510ae86c77ce46f7827687783628e4f2ceb5bf2c41b8cd3c6/behavior	Sandbox submission	2

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