osk.exe

  • File Path: C:\WINDOWS\system32\osk.exe
  • Description: Accessibility On-Screen Keyboard

Screenshot

osk.exe

Hashes

Type Hash
MD5 9237BD6C14767145300EA58ACC2F20F9
SHA1 697D4D6DF64A252540EE32CE56B93EC8EFE3F462
SHA256 53809B7DDDB65CE004076B282A039CA682F68CD3211A48237A71C2CCB0DC7003
SHA384 A69DE3F453CC1F594F3B121B6E6C5402DFDDE756D20463575CDCA62A1BC1A3DE814A78ED52D82AE02F9828824DC2DB66
SHA512 FA43B46827996840E1E4FCDC550009E804A028F15D40432C8F521BB0FB97EECC33B4E92454F0D4A7F84E4BBBDD57A55E919CF2E527703E19244C881DB1F9DAA4
SSDEEP 6144:B2Ra26o168mOoqzetK32tr7HHc1OcvH3AdKy9HGeofJgDEvr6slnCUGw/xIRLtxM:TRo1Bm3qzetyqftjmNwzaoo

Signature

  • Status: Signature verified.
  • Serial: 330000023241FB59996DCC4DFF000000000232
  • Thumbprint: FF82BC38E1DA5E596DF374C53E3617F7EDA36B06
  • Issuer: CN=Microsoft Windows Production PCA 2011, O=Microsoft Corporation, L=Redmond, S=Washington, C=US
  • Subject: CN=Microsoft Windows, O=Microsoft Corporation, L=Redmond, S=Washington, C=US

File Metadata

  • Original Filename: osk.exe.mui
  • Product Name: Microsoft Windows Operating System
  • Company Name: Microsoft Corporation
  • File Version: 10.0.18362.1 (WinBuild.160101.0800)
  • Product Version: 10.0.18362.1
  • Language: English (United States)
  • Legal Copyright: Microsoft Corporation. All rights reserved.

File Similarity (ssdeep match)

File Score
C:\windows\system32\osk.exe 52
C:\WINDOWS\system32\osk.exe 66
C:\Windows\system32\osk.exe 65
C:\Windows\system32\osk.exe 66
C:\Windows\system32\osk.exe 61
C:\windows\SysWOW64\osk.exe 61
C:\Windows\SysWOW64\osk.exe 61

Possible Misuse

The following table contains possible examples of osk.exe being misused. While osk.exe is not inherently malicious, its legitimate functionality can be abused for malicious purposes.

Source Source File Example License
sigma file_event_win_uac_bypass_wmp.yml TargetFilename: 'C:\Program Files\Windows Media Player\osk.exe' DRL 1.0
sigma proc_creation_win_install_reg_debugger_backdoor.yml - 'osk.exe' DRL 1.0
sigma proc_creation_win_stickykey_like_backdoor.yml - 'osk.exe' DRL 1.0
sigma proc_creation_win_uac_bypass_wmp.yml Image: 'C:\Program Files\Windows Media Player\osk.exe' DRL 1.0
sigma registry_event_stickykey_like_backdoor.yml - '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\osk.exe\Debugger' DRL 1.0
sigma registry_event_uac_bypass_wmp.yml TargetObject\|endswith: '\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Compatibility Assistant\Store\C:\Program Files\Windows Media Player\osk.exe' DRL 1.0
LOLBAS Wmic.yml - Command: wmic.exe process call create "C:\Windows\system32\reg.exe add \"HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\osk.exe\" /v \"Debugger\" /t REG_SZ /d \"cmd.exe\" /f"  
LOLBAS Wmic.yml Description: Add cmd.exe as a debugger for the osk.exe process. Each time osk.exe is run, cmd.exe will be run as well.  
atomic-red-team T1546.008.md * On-Screen Keyboard: C:\Windows\System32\osk.exe MIT License. © 2018 Red Canary
atomic-red-team T1546.008.md Upon successful execution, powershell will modify the registry and swap osk.exe with cmd.exe. MIT License. © 2018 Red Canary
atomic-red-team T1546.008.md | parent_list | Comma separated list of system binaries to which you want to attach each #{attached_process}. Default: “osk.exe” | String | osk.exe, sethc.exe, utilman.exe, magnify.exe, narrator.exe, DisplaySwitch.exe, atbroker.exe| MIT License. © 2018 Red Canary
signature-base thor_inverse_matches.yar description = “Abnormal osk.exe (On Screen Keyboard) - typical strings not found in file” CC BY-NC 4.0
signature-base thor_inverse_matches.yar filename == “osk.exe” CC BY-NC 4.0

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