Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
03/08/2026, 09:15
Static task
static1
Behavioral task
behavioral1
Sample
extension-fix-W87101.hta
Resource
win10v2004-20260513-en
Behavioral task
behavioral2
Sample
extension-fix-W87101.hta
Resource
win11ltsc2024-20260709-en
General
- Target extension-fix-W87101.hta
- Size 2KB
- Sample260803-k8cs6sshmg
- SHA256 644f86fad57f3f88418d4ae5705917b77a5a1803b062625bb2bbba79e03ae8b3
- MD5 f7834f45b9ab30f105be15a461b9eca1
- SHA1 8ef189ecb8cb8c8ce93e782219910289b354f19f
- SHA512 d8b5b440eecfce72283f07065b14a7762228bbba24b21c628b417209e4e456f173f307d4137eb218e44705b514fe0da14f14e603eee22cbb5f68dacda125b9fb
- TLSH T1AE5159F7BA4A62D5BC318ADB1E2F5189109016021366E1B8F7ABDD00EF8DE6945743D8
- MD5 SHA1 SHA512 TLSH
Malware Config
Signatures
- Badlisted process makes network request 5 IoCs
Network request originating from process or tool commonly abused by malware.
flow pid Process 6 1360 mshta.exe 8 1360 mshta.exe 15 1360 mshta.exe 16 1360 mshta.exe 21 1360 mshta.exe - Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation mshta.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 3960 cmd.exe - System Location Discovery: System Language Discovery 1 TTPs 14 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language mshta.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language attrib.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language PING.EXE Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language rundll32.exe - System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs
Adversaries may check for Internet connectivity on compromised systems.
pid Process 3960 cmd.exe 972 PING.EXE -
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch rundll32.exe - Modifies registry class 32 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:" rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CacheLimit = "1" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CachePrefix rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CachePrefix = "Visited:" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CachePrefix rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CachePrefix = "Visited:" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CachePrefix = "Visited:" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\MuiCache rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CacheLimit = "51200" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\MuiCache rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CacheLimit = "1" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CachePrefix rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\MuiCache rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CachePrefix rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\MuiCache rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CacheVersion = "1" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CachePrefix = "Visited:" rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CacheVersion = "1" rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\MuiCache rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\History\CachePrefix = "Visited:" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CachePrefix = "Cookie:" rundll32.exe Set value (str) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Content\CachePrefix rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings rundll32.exe Key created \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Extensible Cache rundll32.exe Set value (int) \REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000_Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppContainer\Storage\windows_ie_ac_001\Internet Settings\Cache\Cookies\CacheVersion = "1" rundll32.exe - Runs ping.exe 1 TTPs 1 IoCs
pid Process 972 PING.EXE - Script User-Agent 1 IoCs
Uses user-agent string associated with script host/environment.
description flow ioc HTTP User-Agent header 15 Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) - Suspicious use of FindShellTrayWindow 7 IoCs
pid Process 1888 rundll32.exe 5016 rundll32.exe 2332 rundll32.exe 1560 rundll32.exe 1360 mshta.exe 1360 mshta.exe 784 rundll32.exe - Suspicious use of WriteProcessMemory 13 IoCs
description pid Process procid_target PID 1360 wrote to memory of 1888 1360 mshta.exe 85 PID 1888 wrote to memory of 1048 1888 rundll32.exe 88 PID 1360 wrote to memory of 5016 1360 mshta.exe 89 PID 5016 wrote to memory of 892 5016 rundll32.exe 91 PID 1360 wrote to memory of 2332 1360 mshta.exe 92 PID 2332 wrote to memory of 4012 2332 rundll32.exe 93 PID 1360 wrote to memory of 1560 1360 mshta.exe 94 PID 1560 wrote to memory of 4440 1560 rundll32.exe 95 PID 1360 wrote to memory of 3048 1360 mshta.exe 96 PID 1360 wrote to memory of 784 1360 mshta.exe 104 PID 784 wrote to memory of 3872 784 rundll32.exe 105 PID 1360 wrote to memory of 3960 1360 mshta.exe 106 PID 3960 wrote to memory of 972 3960 cmd.exe 108 - Views/modifies file attributes 1 TTPs 1 IoCs
pid Process 3048 attrib.exe
Processes
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C:\Windows\SysWOW64\mshta.exeC:\Windows\SysWOW64\mshta.exe "C:\Users\Admin\AppData\Local\Temp\extension-fix-W87101.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}1⤵
- Badlisted process makes network request
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1360 -
C:\Windows\SysWOW64\rundll32.exe"C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 82⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1888 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:000000003⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
PID:1048
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 82⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:5016 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:000000003⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
PID:892
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 82⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2332 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:000000003⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
PID:4012
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 82⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:1560 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:000000003⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
PID:4440
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C:\Windows\SysWOW64\attrib.exe"C:\Windows\System32\attrib.exe" +h +s "C:\vgwtxkwn\"2⤵
- System Location Discovery: System Language Discovery
- Views/modifies file attributes
PID:3048
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C:\Windows\SysWOW64\rundll32.exe"C:\Windows\System32\rundll32.exe" InetCpl.cpl,ClearMyTracksByProcess 82⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:784 -
C:\Windows\SysWOW64\rundll32.exeC:\Windows\system32\rundll32.exe C:\Windows\system32\inetcpl.cpl,ClearMyTracksByProcess Flags:8 WinX:0 WinY:0 IEFrame:000000003⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
PID:3872
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c ping -n 300 -w 1000 127.0.0.1 >nul2⤵
- Executes a command shell one-liner
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Suspicious use of WriteProcessMemory
PID:3960 -
C:\Windows\SysWOW64\PING.EXEping -n 300 -w 1000 127.0.0.13⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
PID:972
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Network
MITRE ATT&CK Enterprise v16
Defense Evasion
Hide Artifacts
1Hidden Files and Directories
1Modify Registry
1Replay Monitor
Loading Replay Monitor...
Downloads
- Path C:\vgwtxkwn\a2.zip
- Size 1.3MB
- SHA256 a591bd735cbaba75ac9fc3773eb548a8ba320cb2e65f520a12ee53d3d145277c
- MD5 5891d465b67d99c590dd2c78e7efdcde
- SHA1 bbc15a0101024013946418e8ebe346ac9ff49de5
- SHA512 0b7aeab77ce58993fc6bbb7fedb12a7bc357d1c76cff04e10cb72737d4f1525f227d4db87f3504d7f006c03a124aa0439d77b658b61b12e89d6a2bc6e6f065c3
- SSDEEP 24576:pAuYNwua6NduNqjRt1pSdu4E0mcKptG6lgVT0kQkmSp9QpDH1tMlyaj:pAuSw7Ku4xpSd7m7BlgVQmvQJH1tS
- TLSH T13E553355B7EDDF14E07D52A1C9C14ED42EE304ADBFE8CC081AC84788D5D236DA948EBA
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\vgwtxkwn\a3.zip
- Size 2KB
- SHA256 ce95f67dec16f857e74a55aa71816374676c2e73da6001baae678808308f7303
- MD5 393901e1cc80a61b08a062dc87ed4712
- SHA1 7aa04a6c0ea9d8b0f4e7ee0757db0972a4bc514e
- SHA512 70dee23b5ef3c8a6b2e5a72ec022c7d5d81e3ef62c38cd0a224dd19844e7f115add954631c1984859cfad89f824d8508c7e8a8832e018cd20965ad6cd635df0c
- TLSH T1CB411CE98E7C7DA1D68E79749D14547159372DC455C061791EBFED441120298CA2F82C
- MD5 SHA1 SHA512 TLSH