osk.exe

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

Screenshot

osk.exe

Hashes

Type Hash
MD5 C6012DC3DBF49FBD67DBF57F1DE35E35
SHA1 CFBD7B97CC1321A23DD9E53415163F4AF199B979
SHA256 21E04C0248BE53D40C091619DBE3B7337E8B26D2E37DEBB5E8E0489D3D72B423
SHA384 EF38ED43AAC37BFF290D1E8AC9F6B79888B2F46DD6964CD4C543535F6632BB03413BE6BAB23791306E48CFEF6FED0A4C
SHA512 F0CA5207049B5451870C4C89558D203CE2C137D20F263572356D46DEC0E0DC7D2D7BD5D57DE5562CAD7F40382F00FE8F0143229251DFDBBC6094C8BD76DE4B68
SSDEEP 6144:VUtA/9qfmX28r8Vuc5H3AdKy9HGeofJgDEvr6slnCUGw/xIRLtxIRLuovZ:+A/9q0jmNwzaoo

Signature

  • Status: Signature verified.
  • Serial: 33000000BCE120FDD27CC8EE930000000000BC
  • Thumbprint: E85459B23C232DB3CB94C7A56D47678F58E8E51E
  • 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: 10.0.14393.0 (rs1_release.160715-1616)
  • Product Version: 10.0.14393.0
  • Language: English (United States)
  • Legal Copyright: Microsoft Corporation. All rights reserved.

File Similarity (ssdeep match)

File Score
C:\windows\system32\osk.exe 54
C:\WINDOWS\system32\osk.exe 65
C:\Windows\system32\osk.exe 66
C:\WINDOWS\system32\osk.exe 61
C:\Windows\system32\osk.exe 72
C:\windows\SysWOW64\osk.exe 69
C:\Windows\SysWOW64\osk.exe 80

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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