Analysis
- max time kernel
149s - max time network
140s - platform
windows10-ltsc_2021_x64 - resource
win10ltsc2021-20260513-en - resource tags
- submitted
17/05/2026, 15:45
General
- Target WindowsUpdate.exe
- Size 48.9MB
- Sample260517-s66bpsaw8x
- SHA256 4e083f67fc107392546e09a592184b65e50be2821b33477ab0b541321741c9a3
Malware Config
Signatures
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Drops startup file 1 IoCs
- Executes dropped EXE 4 IoCs
- Loads dropped DLL 53 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates connected drives 3 TTPs 64 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Drops file in Windows directory 1 IoCs
- Detects Pyinstaller 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Modifies registry class 1 IoCs
- Suspicious use of AdjustPrivilegeToken 10 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SetWindowsHookEx 3 IoCs
- Suspicious use of WriteProcessMemory 9 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\WindowsUpdate.exe"C:\Users\Admin\AppData\Local\Temp\WindowsUpdate.exe"1⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\WindowsUpdate.exe"C:\Users\Admin\AppData\Local\Temp\WindowsUpdate.exe"2⤵
- Checks computer location settings
- Drops startup file
- Loads dropped DLL
- Adds Run key to start application
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe"C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe"3⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe"C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe"4⤵
- Executes dropped EXE
- Loads dropped DLL
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "ver"5⤵
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C:\Program Files (x86)\Windows Media Player\wmplayer.exe"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /open "C:\Users\Admin\AppData\Local\Temp\_MEI8562\video.mp4"5⤵
- System Location Discovery: System Language Discovery
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C:\Program Files (x86)\Windows Media Player\wmplayer.exe"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /open "C:\Users\Admin\AppData\Local\Temp\_MEI24442\video.mp4"3⤵
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\unregmp2.exe"C:\Windows\System32\unregmp2.exe" /AsyncFirstLogon4⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\unregmp2.exe"C:\Windows\SysNative\unregmp2.exe" /AsyncFirstLogon /REENTRANT5⤵
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
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C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exeC:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe1⤵
- Executes dropped EXE
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exeC:\Users\Admin\AppData\Roaming\WindowsUpdateService\WindowsUpdate.exe2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p -s upnphost1⤵
- Drops file in Windows directory
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
CurrentDatabase_400.wmdb
WMSDKNS.XML.bak
VCRUNTIME140.dll
VCRUNTIME140_1.dll
_bz2.pyd
_ctypes.pyd
_decimal.pyd
_hashlib.pyd
_lzma.pyd
_queue.pyd
_socket.pyd
_ssl.pyd
auto.tcl
cp1252.enc
pkgIndex.tcl
init.tcl
pkgIndex.tcl
package.tcl
tclIndex
tm.tcl
button.tcl
entry.tcl
icons.tcl
listbox.tcl
menu.tcl
panedwindow.tcl
pkgIndex.tcl
scale.tcl
scrlbar.tcl
spinbox.tcl
text.tcl
tk.tcl
cursors.tcl
fonts.tcl
ttk.tcl
_tkinter.pyd
_wmi.pyd
_zstd.pyd
base_library.zip
libcrypto-3.dll
libffi-8.dll
libssl-3.dll
python314.dll
select.pyd
tcl86t.dll
msgcat-1.6.1.tm
tk86t.dll
unicodedata.pyd
video.mp4
zlib1.dll
euc-cn.enc
74d7f43c1561fc1e.customDestinations-ms
74d7f43c1561fc1e.customDestinations-ms
WindowsUpdate.exe
memory/680-2979-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-3000-0x0000000009490000-0x00000000094A0000-memory.dmp
memory/680-3003-0x0000000009490000-0x00000000094A0000-memory.dmp
memory/680-2976-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2978-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-3001-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-3002-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2999-0x0000000009490000-0x00000000094A0000-memory.dmp
memory/680-2997-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2998-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2977-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2993-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2995-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2996-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/680-2994-0x0000000003E00000-0x0000000003E10000-memory.dmp
memory/928-3005-0x00007FFE5EEA0000-0x00007FFE5EEC9000-memory.dmp
memory/4204-2970-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2983-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2971-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2980-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2974-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2973-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2972-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-2975-0x0000015093160000-0x0000015093170000-memory.dmp
memory/4204-3006-0x00007FFE57A80000-0x00007FFE57AA9000-memory.dmp
memory/4612-3004-0x00007FFE63B10000-0x00007FFE63B39000-memory.dmp