Analysis
- user interaction
yes - max time kernel
58s - max time network
41s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260618-en - resource tags
- submitted
20/06/2026, 01:37
General
- Target OpenSteamTool.dll
- Size 1.4MB
- Sample260620-b2a7bsdy91
- SHA256 b2ed24e0b4e2d0dae4caa8817ed4c0c34af8fdf056f356fd697ae1356ea22581
Malware Config
Signatures
- Enumerates connected drives 3 TTPs 46 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- Drops file in Windows directory 1 IoCs
- Program crash 1 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Checks processor information in registry 2 TTPs 3 IoCs
Processor information is often read in order to detect sandboxing environments.
- Enumerates system info in registry 2 TTPs 3 IoCs
- Modifies registry class 2 IoCs
- Opens file in notepad (likely ransom note) 1 IoCs
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of SetWindowsHookEx 3 IoCs
- Suspicious use of WriteProcessMemory 3 IoCs
Processes
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C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\OpenSteamTool.dll,#11⤵
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C:\Program Files (x86)\Windows Media Player\wmplayer.exe"C:\Program Files (x86)\Windows Media Player\wmplayer.exe" /Play -Embedding1⤵
- Enumerates connected drives
- System Location Discovery: System Language Discovery
- 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" /AsyncFirstLogon2⤵
- 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 /REENTRANT3⤵
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 6420 -s 12162⤵
- Program crash
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p -s upnphost1⤵
- Drops file in Windows directory
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C:\Windows\SysWOW64\WerFault.exeC:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 6420 -ip 64201⤵
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C:\Program Files\Microsoft Office\Root\Office16\POWERPNT.EXE"C:\Program Files\Microsoft Office\Root\Office16\POWERPNT.EXE" /s "C:\Users\Admin\Desktop\PopPush.ppsx" /ou ""1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
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C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\PopPush.ppsx2⤵
- Modifies registry class
- Opens file in notepad (likely ransom note)
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
CurrentDatabase_400.wmdb
CurrentDatabase_400.wmdb
WMSDKNS.XML.bak
wmsetup.log
74d7f43c1561fc1e.customDestinations-ms
74d7f43c1561fc1e.customDestinations-ms
memory/6420-35-0x00000000045C0000-0x00000000045D0000-memory.dmp
memory/6420-36-0x00000000045C0000-0x00000000045D0000-memory.dmp
memory/6420-40-0x00000000045C0000-0x00000000045D0000-memory.dmp
memory/6420-41-0x00000000045C0000-0x00000000045D0000-memory.dmp
memory/6420-34-0x0000000006E80000-0x0000000006E90000-memory.dmp
memory/6420-33-0x0000000006E80000-0x0000000006E90000-memory.dmp
memory/6476-55-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-54-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-56-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-53-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-57-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-58-0x00007FFADB680000-0x00007FFADB690000-memory.dmp
memory/6476-59-0x00007FFADB680000-0x00007FFADB690000-memory.dmp
memory/6476-66-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-67-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-68-0x00007FFADE140000-0x00007FFADE150000-memory.dmp
memory/6476-69-0x00007FFADE140000-0x00007FFADE150000-memory.dmp