Analysis
- max time kernel
150s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
21/04/2026, 18:24
General
- Target Tax Assessment Letter.exe
- Size 1.9MB
- Sample260421-w2celsat8q
- SHA256 facf78d474b66ed821288db41fa6ad8a7b6f30650eb12127cb3e9a3cc6146116
Malware Config
Signatures
- Suspicious use of SetThreadContext 2 IoCs
- Drops file in Program Files directory 6 IoCs
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 1 IoCs
- Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Modifies data under HKEY_USERS 5 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: RenamesItself 1 IoCs
- Suspicious use of AdjustPrivilegeToken 8 IoCs
- Suspicious use of WriteProcessMemory 8 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs -p -s Schedule1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Program Files\Common Files\Overwolf.exe"C:\Program Files\Common Files\Overwolf.exe"2⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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-
C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k netsvcs2⤵
- Suspicious use of SetThreadContext
- Checks processor information in registry
- Modifies data under HKEY_USERS
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\dllhost.exeC:\Windows\system32\dllhost.exe /Processid:{F8284233-48F4-4680-ADDD-F8284233}3⤵
- Suspicious behavior: EnumeratesProcesses
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C:\Users\Admin\AppData\Local\Temp\Tax Assessment Letter.exe"C:\Users\Admin\AppData\Local\Temp\Tax Assessment Letter.exe"1⤵
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: RenamesItself
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
Overwolf.exe
vulkan-1.bin
vulkan-1.dll
memory/1188-24-0x0000000180000000-0x000000018004B000-memory.dmp
memory/1188-20-0x00000238345E0000-0x00000238345E1000-memory.dmp
memory/1248-37-0x00007FFB8A7B0000-0x00007FFB8B078000-memory.dmp
memory/1248-36-0x000002346E4F0000-0x000002346E868000-memory.dmp
memory/1248-19-0x00007FFBAA580000-0x00007FFBAA789000-memory.dmp
memory/1248-15-0x0000000180000000-0x000000018004B000-memory.dmp
memory/1248-23-0x00007FFB8A7B0000-0x00007FFB8B078000-memory.dmp
memory/3364-50-0x000001BC37E60000-0x000001BC37E61000-memory.dmp
memory/3364-53-0x0000000180000000-0x000000018006D000-memory.dmp
memory/3364-57-0x00007FFBAA580000-0x00007FFBAA789000-memory.dmp
memory/3364-69-0x000001BC3A050000-0x000001BC3A16E000-memory.dmp
memory/4396-10-0x00007FFB8A7B0000-0x00007FFB8B078000-memory.dmp
memory/4396-11-0x0000028C1C870000-0x0000028C1CBE8000-memory.dmp
memory/4396-0-0x0000000180000000-0x000000018004B000-memory.dmp
memory/4396-9-0x00007FF7B0B00000-0x00007FF7B0CE4000-memory.dmp
memory/4396-7-0x00007FFB8A7B0000-0x00007FFB8B078000-memory.dmp
memory/4396-8-0x0000028C1AED0000-0x0000028C1AED1000-memory.dmp
memory/4396-4-0x00007FFBAA580000-0x00007FFBAA789000-memory.dmp
memory/4640-28-0x0000021DADAB0000-0x0000021DADAB1000-memory.dmp
memory/4640-34-0x00007FFBAA580000-0x00007FFBAA789000-memory.dmp
memory/4640-30-0x0000000180000000-0x000000018004B000-memory.dmp
memory/4640-39-0x0000021DAF000000-0x0000021DAF06D000-memory.dmp
memory/4640-43-0x00007FFBAA580000-0x00007FFBAA789000-memory.dmp
memory/4640-68-0x0000021DAE340000-0x0000021DAE6B8000-memory.dmp