Analysis
- max time kernel
150s - max time network
145s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260706-en - resource tags
- submitted
09/07/2026, 02:20
General
- Target umbrabootstrapperwowupdated.exe
- Size 3.4MB
- Sample260709-csxveaby9m
- SHA256 2c3dd9e946d7b3456da1b09ee3b1d0ff5c42dd26b6b7d6a7d2e318e45015c6ca
Malware Config
Signatures
- Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
- Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
- Looks for VMWare Tools registry key 2 TTPs 1 IoCs
- Checks BIOS information in registry 2 TTPs 4 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 2 IoCs
- Themida packer 3 IoCs
Detects Themida, an advanced Windows software protection system.
- Checks whether UAC is enabled 1 TTPs 2 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 6 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Maps connected drives based on registry 3 TTPs 2 IoCs
Disk information is often read in order to detect sandboxing environments.
- Network Share Discovery 1 TTPs
Attempt to gather information on host network.
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Drops file in Windows directory 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 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Suspicious behavior: EnumeratesProcesses 51 IoCs
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 16 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\umbrabootstrapperwowupdated.exe"C:\Users\Admin\AppData\Local\Temp\umbrabootstrapperwowupdated.exe"1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Local\Temp\Umbra\umbra.exe"C:\Users\Admin\AppData\Local\Temp\Umbra\umbra.exe"2⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Executes dropped EXE
- Loads dropped DLL
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --embedded-browser-webview=1 --webview-exe-name=umbra.exe --webview-exe-version=1.0.0.0 --user-data-dir="C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView" --noerrdialogs --embedded-browser-webview-dpi-awareness=1 --edge-webview-custom-scheme --enable-features=MojoIpcz --mojo-named-platform-channel-pipe=4524.920.9450671690604727746 /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf3⤵
- Drops file in Windows directory
- Enumerates system info in registry
- Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
- Suspicious use of WriteProcessMemory
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --type=crashpad-handler --user-data-dir=C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView /prefetch:4 /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf --monitor-self-annotation=ptype=crashpad-handler --database=C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView\Crashpad --annotation=IsOfficialBuild=1 --annotation=channel= --annotation=chromium-version=122.0.6261.139 "--annotation=exe=C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --annotation=plat=Win64 "--annotation=prod=Edge WebView2" --annotation=ver=122.0.2365.106 --initial-client-data=0x184,0x188,0x18c,0x160,0x194,0x7ffdac965fd8,0x7ffdac965fe4,0x7ffdac965ff04⤵
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --type=gpu-process --noerrdialogs --user-data-dir="C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView" --webview-exe-name=umbra.exe --webview-exe-version=1.0.0.0 --embedded-browser-webview=1 --embedded-browser-webview-dpi-awareness=1 --edge-webview-custom-scheme --no-appcompat-clear --gpu-preferences=WAAAAAAAAADgAAAMAAAAAAAAAAAAAAAAAABgAAAAAAA4AAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAAAAAAAAAAYAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAIAAAAAAAAAA== --mojo-platform-channel-handle=1748 --field-trial-handle=1752,i,9602309404488959517,3229722503834649562,262144 --enable-features=MojoIpcz --variations-seed-version /prefetch:2 /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf4⤵
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --noerrdialogs --user-data-dir="C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView" --webview-exe-name=umbra.exe --webview-exe-version=1.0.0.0 --embedded-browser-webview=1 --embedded-browser-webview-dpi-awareness=1 --edge-webview-custom-scheme --no-appcompat-clear --mojo-platform-channel-handle=2420 --field-trial-handle=1752,i,9602309404488959517,3229722503834649562,262144 --enable-features=MojoIpcz --variations-seed-version /prefetch:3 /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf4⤵
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=service --noerrdialogs --user-data-dir="C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView" --webview-exe-name=umbra.exe --webview-exe-version=1.0.0.0 --embedded-browser-webview=1 --embedded-browser-webview-dpi-awareness=1 --edge-webview-custom-scheme --no-appcompat-clear --mojo-platform-channel-handle=2304 --field-trial-handle=1752,i,9602309404488959517,3229722503834649562,262144 --enable-features=MojoIpcz --variations-seed-version /prefetch:8 /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf4⤵
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C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe"C:\Program Files (x86)\Microsoft\EdgeWebView\Application\122.0.2365.106\msedgewebview2.exe" --type=renderer --noerrdialogs --user-data-dir="C:\Users\Admin\AppData\Local\Temp\BallisticRebornWebView2Cache\EBWebView" --webview-exe-name=umbra.exe --webview-exe-version=1.0.0.0 --embedded-browser-webview=1 --embedded-browser-webview-dpi-awareness=1 --edge-webview-custom-scheme --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --js-flags="--harmony-weak-refs-with-cleanup-some --expose-gc --ms-user-locale=" --mojo-platform-channel-handle=3364 --field-trial-handle=1752,i,9602309404488959517,3229722503834649562,262144 --enable-features=MojoIpcz --variations-seed-version /pfhostedapp:e91555a9640b77b52db8372f4c63e376d0fdddcf /prefetch:14⤵
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Network
MITRE ATT&CK Enterprise v16
Replay Monitor
Loading Replay Monitor...
Downloads
settings.dat
settings.dat
throttle_store.dat
78983f9a-95ca-4e9b-97aa-420b3c2355a6.tmp
MANIFEST-000001
SCT Auditing Pending Reports
CURRENT
data_0
data_1
data_2
data_3
Local State
Local State
Local State
Local State~RFe5a7e88.TMP
Microsoft.Web.WebView2.Core.dll
Microsoft.Web.WebView2.Wpf.dll
index.html
lua.js
editor.main.css
editor.main.js
editor.main.nls.js
loader.js
medal.dll
WebView2Loader.dll
umbra.exe
memory/1296-263-0x00007FFDD6110000-0x00007FFDD6111000-memory.dmp
memory/2532-22-0x00000000773A0000-0x000000007762A000-memory.dmp
memory/2532-146-0x00000000773A0000-0x000000007762A000-memory.dmp
memory/2532-145-0x0000000000400000-0x0000000000CE6000-memory.dmp
memory/2532-0-0x0000000000400000-0x0000000000CE6000-memory.dmp
memory/2532-33-0x000000000A770000-0x000000000A782000-memory.dmp
memory/2532-32-0x000000000A750000-0x000000000A75A000-memory.dmp
memory/2532-21-0x0000000000400000-0x0000000000CE6000-memory.dmp
memory/2532-20-0x000000000A8F0000-0x000000000A8FE000-memory.dmp
memory/2532-19-0x000000000A8A0000-0x000000000A8DE000-memory.dmp
memory/2532-18-0x000000000A930000-0x000000000A938000-memory.dmp
memory/2532-7-0x00000000773A0000-0x000000007762A000-memory.dmp
memory/2532-6-0x00000000773A0000-0x000000007762A000-memory.dmp
memory/2532-5-0x0000000000400000-0x0000000000CE6000-memory.dmp
memory/2532-4-0x0000000000400000-0x0000000000CE6000-memory.dmp
memory/2532-3-0x00000000773A0000-0x000000007762A000-memory.dmp
memory/2532-1-0x00000000774EE000-0x00000000774EF000-memory.dmp
memory/4524-139-0x0000020E9F8B0000-0x0000020E9F9EC000-memory.dmp
memory/4524-147-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-166-0x0000020EBF1F0000-0x0000020EBF22E000-memory.dmp
memory/4524-167-0x0000020EBF1C0000-0x0000020EBF1CE000-memory.dmp
memory/4524-165-0x0000020EBAD70000-0x0000020EBAD78000-memory.dmp
memory/4524-151-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-157-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-156-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-153-0x0000020EBAD80000-0x0000020EBAE4A000-memory.dmp
memory/4524-137-0x00007FFDB568F000-0x00007FFDB5690000-memory.dmp
memory/4524-150-0x0000020EBA010000-0x0000020EBA028000-memory.dmp
memory/4524-149-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-144-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-143-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-142-0x0000020EB9EF0000-0x0000020EB9FAA000-memory.dmp
memory/4524-141-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-346-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/4524-140-0x00007FFDB5500000-0x00007FFDB5EA4000-memory.dmp
memory/5092-359-0x00000229CEC10000-0x00000229CEC3F000-memory.dmp
memory/5092-267-0x00007FFDD6110000-0x00007FFDD6111000-memory.dmp