Ksomisc.exe What Is It [new] Review

Document ID: TEC-2024-ksomisc-01 Severity Assessment: Low (Legitimate) / Medium (If impersonated) Audience: System Administrators, Security Analysts, IT Support Professionals 1. Executive Summary ksomisc.exe (Kaspersky Setup and Installation Modifier Configuration Utility) is a legitimate executable file associated with Kaspersky Lab’s suite of antivirus and endpoint security products. Its primary function is to diagnose, repair, modify, and configure existing Kaspersky installations without requiring a full uninstallation and reinstallation. While generally safe, its legitimate nature and system-level access make it a potential target for malware authors attempting to hide malicious processes through naming convention impersonation. 2. File Origin and Location | Attribute | Details | | :--- | :--- | | Full Name | Kaspersky Anti-Virus Setup / Configuration Utility | | Typical File Path | C:\Program Files (x86)\Kaspersky Lab\Kaspersky *\ksomisc.exe | | Digital Signer | Kaspersky Lab JSC (or AO Kaspersky Lab) | | File Version | Varies by product version (e.g., 21.3.10.391) | | File Size | Typically between 500 KB – 2 MB | | Associated Services | AVP (Kaspersky Anti-Virus Service), KAVFS |

Organizations should add a detection rule to alert on ksomisc.exe execution from any directory other than C:\Program Files (x86)\Kaspersky Lab\ . Appendix: Sample YARA Rule for Detection of Impersonated ksomisc.exe rule ksomisc_impersonation meta: description = "Detects ksomisc.exe outside legitimate Kaspersky path" author = "Security Research" date = "2024-01-01" strings: $name = "ksomisc.exe" nocase $kaspersky_path = "\\Kaspersky Lab\\" nocase $valid_signer = "Kaspersky Lab JSC" condition: filename == "ksomisc.exe" and not ( $kaspersky_path in filepath or $valid_signer in signature ) ksomisc.exe what is it

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