Analysis
- max time kernel
150s - max time network
152s - platform
windows11-21h2_x64 - resource
win11-20260513-en - resource tags
- submitted
17/08/2026, 16:47
General
- Target steam-checker.exe
- Size 5.3MB
- Sample260817-vanswsvdkf
- SHA256 6c7b85a432258b005a5344208aafe53b0c94ce220b143f8438ec41c47bbe9c1c
Malware Config
Signatures
- Creates a file in the Startup directory 1 TTPs 2 IoCs
A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of WriteProcessMemory 1 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:\Users\Admin\AppData\Local\Temp\steam-checker.exe"C:\Users\Admin\AppData\Local\Temp\steam-checker.exe"1⤵
- Creates a file in the Startup directory
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\schtasks.exe"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "steam-checker" /tr "C:\Users\Admin\AppData\Roaming\steam-checker"2⤵
- Scheduled Task/Job: Scheduled Task
-
-
C:\Users\Admin\AppData\Roaming\steam-checkerC:\Users\Admin\AppData\Roaming\steam-checker1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\steam-checkerC:\Users\Admin\AppData\Roaming\steam-checker1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
-
C:\Users\Admin\AppData\Roaming\steam-checkerC:\Users\Admin\AppData\Roaming\steam-checker1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
2Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
steam-checker.log
steam-checker
memory/3212-9-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3212-3-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3212-4-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3212-8-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3212-0-0x0000000000990000-0x0000000000EE0000-memory.dmp
memory/3212-2-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3212-1-0x000000001D2B0000-0x000000001D2C0000-memory.dmp
memory/3452-14-0x000000001CA00000-0x000000001CA10000-memory.dmp
memory/3452-13-0x000000001CA00000-0x000000001CA10000-memory.dmp
memory/3452-12-0x000000001CA00000-0x000000001CA10000-memory.dmp
memory/3452-15-0x000000001CA00000-0x000000001CA10000-memory.dmp
memory/3452-16-0x000000001CA00000-0x000000001CA10000-memory.dmp
memory/3452-17-0x000000001CA00000-0x000000001CA10000-memory.dmp