CVE-2022-44698

What it actually does

CVE-2022-44698 is a Windows SmartScreen security feature bypass affecting multiple Windows 10, Windows 11, and Windows Server releases. A specially crafted file downloaded from the internet can bypass SmartScreen and Mark-of-the-Web-driven reputation checks, reducing or suppressing the normal warning prompts users expect before opening untrusted content. The vulnerability does not by itself grant code execution without user interaction, but it removes an important defense layer that normally blocks or warns on suspicious downloaded files. Successful exploitation can allow attacker-controlled files, scripts, or installers to run with the privileges of the user who opens them, enabling payload delivery, malware installation, or ransomware execution.

Why it matters to the business

This vulnerability increases the likelihood that phishing, drive-by download, or malicious attachment campaigns succeed because Windows may not present expected SmartScreen warnings for attacker-crafted files. It has been exploited in the wild, is listed in CISA KEV, and has been associated with ransomware activity, so unpatched endpoints and servers used for browsing, email, file handling, or administrative work represent elevated operational risk. Business consequences include malware infection, ransomware deployment, data loss, interruption of user productivity, incident response costs, and potential lateral movement if the affected user has elevated privileges.

How an attack unfolds

An attacker prepares a malicious file that is crafted to bypass Windows SmartScreen security checks, historically including files designed to mishandle reputation or Mark-of-the-Web validation. The attacker then delivers the file through email, messaging, compromised websites, malvertising, search-engine poisoning, or a fake software/update download. A user downloads and opens the file. Because of the bypass, Windows may fail to show the expected SmartScreen warning or may not correctly enforce the security decision for internet-origin content. The malicious content then executes in the context of the user, commonly launching script interpreters, command shells, installers, or LOLBins to download and run additional malware. In ransomware scenarios, the payload may establish persistence, disable defenses, enumerate files and network shares, exfiltrate data, and encrypt local or reachable resources.

How to fix it

Apply the Microsoft security updates released for CVE-2022-44698, including the December 2022 cumulative updates or any later cumulative update for affected Windows versions. Prioritize Windows 10 1607, 1809, 20H2, 21H1, 21H2, 22H2; Windows 11 21H2; Windows Server 2016; Windows Server 2019; and Windows Server 2022 systems that are used for email, web browsing, file downloads, administrative activity, or remote user workflows. Because this vulnerability is in CISA KEV and has ransomware association, treat remediation as overdue if not already complete; the CISA due date was 2023-01-03. Where immediate patching is not possible, reduce exposure by enforcing application control, blocking untrusted scripts and executables from user-writable download locations, enabling Microsoft Defender Antivirus and cloud-delivered protection, restricting script interpreters such as wscript.exe and cscript.exe where feasible, blocking risky attachment types at email and web gateways, and ensuring users cannot run downloaded executables with elevated privileges.

How to confirm the fix worked

Confirm that affected Windows systems have installed the December 2022 cumulative update or a later cumulative update applicable to the operating system release. Validate through centralized patch management, Microsoft Update compliance reporting, endpoint management inventory, or local commands such as winver and Get-HotFix where appropriate. Test controls by verifying that internet-origin files retain Mark-of-the-Web metadata and that SmartScreen reputation checks and warnings are active for unknown or suspicious downloads. Review group policy or endpoint security configuration to ensure SmartScreen is not disabled. Validate mitigations by confirming application control or attack surface reduction rules prevent execution of untrusted scripts and executables from Downloads, Temp, browser cache, and email attachment locations.

Typical attack path

1. Attacker crafts or obtains a malicious internet-delivered file that abuses the SmartScreen bypass condition.
2. Attacker distributes the file through phishing, fake downloads, compromised websites, or malvertising.
3. Victim downloads the file onto a vulnerable Windows system.
4. Victim opens the file, satisfying the required user interaction.
5. SmartScreen or Mark-of-the-Web-based warning behavior is bypassed or weakened.
6. The file launches malicious code, script interpreters, or built-in Windows utilities.
7. Second-stage malware is downloaded or unpacked and executed.
8. Attacker establishes persistence, performs discovery, and may steal credentials or data.
9. In ransomware campaigns, malware encrypts local files and accessible network resources.

How to detect it

Investigate whether the vulnerability was exploited by correlating file-download activity with process execution and endpoint alerts. Useful sources include EDR telemetry, Windows Security logs, Sysmon process creation events, Microsoft Defender Antivirus and Defender for Endpoint alerts, SmartScreen-related telemetry, PowerShell logs, script block logs, browser download history, email gateway logs, proxy logs, and file system artifacts such as Zone.Identifier alternate data streams. Hunt for internet-origin files that were opened and immediately spawned script interpreters or living-off-the-land binaries, especially from Downloads, Desktop, Temp, email attachment cache, browser cache, or archive extraction directories. Review executions where parent processes are browsers, email clients, archive tools, or PDF/Office applications and child processes include wscript.exe, cscript.exe, powershell.exe, cmd.exe, mshta.exe, rundll32.exe, regsvr32.exe, msiexec.exe, certutil.exe, bitsadmin.exe, or curl.exe. For already-exploited systems, look for malformed or invalid Authenticode-signed files, internet-zone files lacking expected user warning history, unusual Defender or SmartScreen allow events, second-stage downloads, persistence creation, credential access tooling, mass file modification, volume shadow copy deletion, and ransomware notes. Because this issue has ransomware association, also review for rapid file renames/encryption, suspicious access to network shares, backup deletion, and security tool tampering following execution of a recently downloaded file.

• Zone.Identifier
• ZoneId=3
• ZoneId=4
• wscript.exe
• cscript.exe
• mshta.exe
• powershell.exe
• cmd.exe
• rundll32.exe
• regsvr32.exe
• msiexec.exe
• certutil.exe
• bitsadmin.exe
• vssadmin.exe Delete Shadows
• wmic.exe shadowcopy delete
• bcdedit.exe /set {default} recoveryenabled No
• bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures
• Get-AuthenticodeSignature
• Status: NotSigned
• Status: UnknownError
• Microsoft-Windows-Windows Defender/Operational
• Microsoft-Windows-PowerShell/Operational
• Microsoft-Windows-Sysmon/Operational
• \Users\*\Downloads\*.js
• \Users\*\Downloads\*.jse
• \Users\*\Downloads\*.vbs
• \Users\*\Downloads\*.wsf
• \Users\*\Downloads\*.hta
• \Users\*\Downloads\*.lnk
• \Users\*\AppData\Local\Temp\*.js
• \Users\*\AppData\Local\Temp\*.exe

What your security team should do

• Immediately identify all affected Windows 10, Windows 11, and Windows Server systems and verify installation of the December 2022 or later cumulative security update.
• Prioritize remediation for endpoints used by high-risk users, administrators, help desk staff, developers, and systems with access to sensitive data or network shares.
• Treat unpatched systems as high-risk because the vulnerability is in CISA KEV, has active exploitation, has high EPSS, and is associated with ransomware campaigns.
• Hunt for suspicious executions from Downloads, Temp, browser cache, email attachment folders, and archive extraction directories around the time users opened internet-delivered files.
• Create detections for browser or email-client processes spawning script interpreters, command shells, PowerShell, mshta, rundll32, regsvr32, or installer processes.
• Ensure SmartScreen, Microsoft Defender Antivirus, cloud protection, network protection, and attack surface reduction rules are enabled where operationally feasible.
• Block or quarantine high-risk attachment and download types such as .js, .jse, .vbs, .vbe, .wsf, .hta, .lnk, .iso, .img, .exe, .scr, and password-protected archives where business processes allow.
• Use application control to prevent execution from user-writable locations and to limit unsigned or untrusted binaries and scripts.
• Review ransomware readiness, including immutable backups, privileged access controls, EDR coverage, and network share permissions.
• Perform retrospective hunting for signs of malware delivery and ransomware staging on systems that were unpatched after public disclosure.