Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    31/07/2026, 16:07

General

  • Target
    SplashtopSOS_Win_v3.8.4.1_RZZAWPJYALYXEU.exe
  • Size 20.0MB
  • Sample260731-tk4fnadb34
  • SHA256 098a2ea17942acb76c797ac26400816f227a924a69e6b2aa5a932f01d223efff
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • ACProtect 1.3x - 1.4x DLL software 6 IoCs

    Detects file using ACProtect software.

  • Drops file in System32 directory 10 IoCs
  • UPX packed file 6 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in Windows directory 2 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Executes a command shell one-liner 1 TTPs 5 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 41 IoCs
  • 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 SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 11 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\SplashtopSOS_Win_v3.8.4.1_RZZAWPJYALYXEU.exe
    "C:\Users\Admin\AppData\Local\Temp\SplashtopSOS_Win_v3.8.4.1_RZZAWPJYALYXEU.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4208
    • C:\Windows\system32\cmd.exe
      "C:\Windows\sysnative\cmd.exe" /c C:\Windows\system32\expand.exe *.cab /f:* .\
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:932
      • C:\Windows\system32\expand.exe
        C:\Windows\system32\expand.exe *.cab /f:* .\
        3⤵
        • Drops file in Windows directory
        PID:4632
    • C:\Windows\system32\cmd.exe
      "C:\Windows\sysnative\cmd.exe" /c schtasks /create /xml ASOS.xml /ru "system" /tn ASOS1
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3104
      • C:\Windows\system32\schtasks.exe
        schtasks /create /xml ASOS.xml /ru "system" /tn ASOS1
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:5636
    • C:\Windows\system32\cmd.exe
      "C:\Windows\sysnative\cmd.exe" /c schtasks /change /tn ASOS1 /ru "system" /tr "'C:\Users\Admin\AppData\Local\Temp\unpacksos\1\\Launcher.exe' SRManagerSOS.exe 1 "
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:5584
      • C:\Windows\system32\schtasks.exe
        schtasks /change /tn ASOS1 /ru "system" /tr "'C:\Users\Admin\AppData\Local\Temp\unpacksos\1\\Launcher.exe' SRManagerSOS.exe 1 "
        3⤵
          PID:1132
      • C:\Windows\system32\cmd.exe
        "C:\Windows\sysnative\cmd.exe" /c schtasks /run /tn ASOS1
        2⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:3284
        • C:\Windows\system32\schtasks.exe
          schtasks /run /tn ASOS1
          3⤵
            PID:5856
        • C:\Windows\system32\cmd.exe
          "C:\Windows\sysnative\cmd.exe" /c schtasks /delete /f /tn ASOS1
          2⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:5852
          • C:\Windows\system32\schtasks.exe
            schtasks /delete /f /tn ASOS1
            3⤵
              PID:5824
        • C:\Users\Admin\AppData\Local\Temp\unpacksos\1\Launcher.exe
          "C:\Users\Admin\AppData\Local\Temp\unpacksos\1\\Launcher.exe" SRManagerSOS.exe 1
          1⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:2020
          • C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRManagerSOS.exe
            "SRManagerSOS.exe"
            2⤵
            • Drops file in System32 directory
            • Executes dropped EXE
            • Loads dropped DLL
            • System Location Discovery: System Language Discovery
            • Modifies data under HKEY_USERS
            PID:4416
        • C:\Users\Admin\AppData\Local\Temp\unpacksos\1\Launcher.exe
          "C:\Users\Admin\AppData\Local\Temp\unpacksos\1\\Launcher.exe"
          1⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:2868

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

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              Downloads

              launcher.txt

              • Path C:\Users\Admin\AppData\Local\Temp\splashtop\sos\launcher.txt
              • Size 238B
              • SHA256 41f1b8d9fadc7c926b712f30755d489d58e791b0a7c2fd519518b33efc86f595
              • MD5 SHA1 SHA512 TLSH

              unpack1.log

              • Path C:\Users\Admin\AppData\Local\Temp\unpack1.log
              • Size 5KB
              • SHA256 46f5a85c1202b6f022aef6c07a2ff6cae52f6b7a7fbf035322148c0961ff10c6
              • MD5 SHA1 SHA512 SSDEEP TLSH

              .init_setting.ini

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\.init_setting.ini
              • Size 149B
              • SHA256 56a41a56324d7b26629da4243fcf51f2822b9d9817db409c15877dcaf7202d4b
              • MD5 SHA1 SHA512 TLSH

              ASOS.xml

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\ASOS.xml
              • Size 2KB
              • SHA256 1008bce6f93a3863164b0fea34bea07bd6ce304dffafac5615dc52bbb675bd47
              • MD5 SHA1 SHA512 TLSH

              Acknowledgements.htm

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\Acknowledgements.htm
              • Size 153KB
              • SHA256 116d765d92d26205a27e2fb53412b10fe8837e68030f6ecab1359fed0106170d
              • MD5 SHA1 SHA512 SSDEEP TLSH

              Launcher.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\Launcher.exe
              • Size 199KB
              • SHA256 627798fc9cee75566928e0ee14e5be73651509c94fb5cfd44511048fd16fcbbc
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRAgentSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRAgentSOS.exe
              • Size 3.0MB
              • SHA256 bb6c4afa3fd59192c7fdcb3e4482f54028c6624be06c7e4113e04c6046857d0b
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRAppPBSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRAppPBSOS.exe
              • Size 2.8MB
              • SHA256 96de45f42364fc67b5ccdb46692da5d347aac249bcdfebc1e497ce694d07e4a4
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRAppSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRAppSOS.exe
              • Size 2.7MB
              • SHA256 2ed0c3edef51ae2203e25933cdfd38e5f40357237e23c501d76cc7347cd2a194
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRAudioChatSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRAudioChatSOS.exe
              • Size 2.7MB
              • SHA256 bbd6cfb87f2a317805580916f72deb98b32f969a5a62a74249b691ad70171deb
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRAudioResample.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRAudioResample.dll
              • Size 130KB
              • SHA256 d17762f6924a926ef6190e05a7606fcd7da451ddc8905acb112e06bfc667f309
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRChatSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRChatSOS.exe
              • Size 2.7MB
              • SHA256 2a574598472970cc34b5a7edd94253e1b9325d77dc964f9efcf393999c988ea5
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRClient.pem

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRClient.pem
              • Size 5KB
              • SHA256 33fe8889070b91c3c2e234db8494fcc174ecc69cfff3d0bc4f6a59b39c500484
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRFeatureSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRFeatureSOS.exe
              • Size 4.7MB
              • SHA256 ad00e66348c8fcfa656f6e6ff6943a275756d9aa782aa0af6525a789f4ef3b90
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRFeatureSOSNoUIA.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRFeatureSOSNoUIA.exe
              • Size 4.6MB
              • SHA256 271730aef580f169615d0b1ddccd83e7ec8e5a23976f237f9df4bb1e519af423
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRManagerSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRManagerSOS.exe
              • Size 2.0MB
              • SHA256 73ef0d89b04262d64a2f509d5877a627494e03fb25ccc3209a0f9f00e08c2d7c
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SROpus.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SROpus.dll
              • Size 322KB
              • SHA256 a83cdfc6addac319e9cf2f950958db790ca430f96d900b5205828ebe9b2829a8
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRServerSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRServerSOS.exe
              • Size 5.2MB
              • SHA256 290ded9f8851808cc1210294fc3b773202f793695ab682b16cad784cccbd0694
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRServiceSOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRServiceSOS.exe
              • Size 2.3MB
              • SHA256 7cf80ba38b64293342c8756377e23101949225cca77bbc817529968d2d81cec1
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRSocketCtrl.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRSocketCtrl.dll
              • Size 527KB
              • SHA256 6fc25bf2fdb71e79468e7e705515267c27b0377e4f8fb6c38aa689f3a711c870
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRUtilitySOS.exe

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRUtilitySOS.exe
              • Size 172KB
              • SHA256 060e5af5161fa20b99ad633e8fa476766356077bf89d8b65828b4afb82706b34
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRVideoCtrl.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRVideoCtrl.dll
              • Size 4.2MB
              • SHA256 8400f2252d399a29bd88175b7402434e97e28dcdb146d3a3a4ec05b491a26d37
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRVideoCtrlEx.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRVideoCtrlEx.dll
              • Size 4.3MB
              • SHA256 02177b93940fed3357345a8f33bcdc5a2727cb8821464bb17944689de710203d
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRx264Wrapper.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRx264Wrapper.dll
              • Size 308KB
              • SHA256 3e22f13f3c3920d902d960415f9975701734cfd408c2320c9ff05a0aea297705
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRx264WrapperEx.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRx264WrapperEx.dll
              • Size 308KB
              • SHA256 0e4034c447cb896e90c6fc91b374209a1c027a03dc2509e06e9f2890a9dd5f9f
              • MD5 SHA1 SHA512 SSDEEP TLSH

              SRx264WrapperExx.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\SRx264WrapperExx.dll
              • Size 2.3MB
              • SHA256 d1e458b0f9e6719c3150aa7565fe20585a94311e13c5f64596e7153c8b915bb4
              • MD5 SHA1 SHA512 SSDEEP TLSH

              avutil-60.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\avutil-60.dll
              • Size 521KB
              • SHA256 611c5a353f80cc3a78cea637a159b099995e788e44c9c4e0356da71c65660f85
              • MD5 SHA1 SHA512 SSDEEP TLSH

              dbghelp.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\dbghelp.dll
              • Size 1.0MB
              • SHA256 4b890de3708716d81c1c719b498734339d417e8ffc4955d81483d1ebc0f84697
              • MD5 SHA1 SHA512 SSDEEP TLSH

              fips.cnf

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\fips.cnf
              • Size 860B
              • SHA256 45569313e0586604fecd3dcdac23f75b01796b8277e150d2bbcf74ce8e85e3f0
              • MD5 SHA1 SHA512 TLSH

              fips.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\fips.dll
              • Size 796KB
              • SHA256 d28f105feab691bde1f05ba4f4d91602d52528ed629f1ceb00c19f9801592f84
              • MD5 SHA1 SHA512 SSDEEP TLSH

              legacy.cnf

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\legacy.cnf
              • Size 168B
              • SHA256 9acde3809e2c02fe5d6c59153aefffe6628996ec5cfb7c2385865dcd1ec8be7e
              • MD5 SHA1 SHA512 TLSH

              legacy.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\legacy.dll
              • Size 170KB
              • SHA256 5881cefef0bfb4afee790e4676d40eb39e4001e9f68b13a063fc5773d7e208e8
              • MD5 SHA1 SHA512 SSDEEP TLSH

              libcelt-0.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\libcelt-0.dll
              • Size 104KB
              • SHA256 b644f5d3b3a627e52000191a34f825eb5753b276efb5ffe4d5af17923adb896e
              • MD5 SHA1 SHA512 SSDEEP TLSH

              libcrypto-3.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\libcrypto-3.dll
              • Size 1.7MB
              • SHA256 c6eb36a9f09d5c8eaf42c851306ffb886dbfc330c2b9c8eef4bf9697689428dd
              • MD5 SHA1 SHA512 SSDEEP TLSH

              libcurl.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\libcurl.dll
              • Size 739KB
              • SHA256 9763d48c561485b6b3d28f911f6368f9930ece3ef8193b5ff4bb5f1ca630fc2d
              • MD5 SHA1 SHA512 SSDEEP TLSH

              libssl-3.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\libssl-3.dll
              • Size 489KB
              • SHA256 bdbfdc55885736fe9657d5a2834550f8ff28141350e05279716ea321805dda39
              • MD5 SHA1 SHA512 SSDEEP TLSH

              libx264-116.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\libx264-116.dll
              • Size 1.0MB
              • SHA256 f28539f93e463b3c14db5122eeee5a6871fbf1b610466562d0c7d6c03d114715
              • MD5 SHA1 SHA512 SSDEEP TLSH

              p_mount.bat

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\p_mount.bat
              • Size 214B
              • SHA256 b085f4e0d6a7a4dc967c96d7c318cb749bc497135fd9e35d7ad0c88e6c53f577
              • MD5 SHA1 SHA512 TLSH

              p_unmount.bat

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\p_unmount.bat
              • Size 203B
              • SHA256 347b12e6e2fc79e2a3668625341d7642d531159ffe5b01ab2bc5469e0efc6b3f
              • MD5 SHA1 SHA512 TLSH

              reboot.bat

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\reboot.bat
              • Size 3KB
              • SHA256 eb700422c31c15757a6c70141274a184d291aac3bde191a964f75a90bc084143
              • MD5 SHA1 SHA512 TLSH

              stprinter.cat

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\stprinter.cat
              • Size 17KB
              • SHA256 eb61a0e06bf8c69597f9bb1909e3eb4f926e49800c3f9721fda3007993da5ee7
              • MD5 SHA1 SHA512 SSDEEP TLSH

              stprinter.inf

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\stprinter.inf
              • Size 2KB
              • SHA256 0b60a283cb98034cee13118bf1f885a644479cc6f4b19d9e4d24a5fec6064a1f
              • MD5 SHA1 SHA512 TLSH

              stprinterx.cat

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\stprinterx.cat
              • Size 19KB
              • SHA256 84e1a32b4975e92477cf6a36d8931921da735ef988e0c09a2b056f2904541b1e
              • MD5 SHA1 SHA512 SSDEEP TLSH

              stprintmon_x64.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\stprintmon_x64.dll
              • Size 231KB
              • SHA256 f19f300e4623e3b57f870d8e4b150f2e70d29e6cb47750671d53667bb0804202
              • MD5 SHA1 SHA512 SSDEEP TLSH

              stprintmon_x86.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\stprintmon_x86.dll
              • Size 209KB
              • SHA256 b23b42e24eab4e2f1dd94711eec741f94d39f5ebaf238820a0b9d464522c24d2
              • MD5 SHA1 SHA512 SSDEEP TLSH

              streamer1.cab

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\streamer1.cab
              • Size 18.7MB
              • SHA256 854f41ded9e937717734e628116205986a98bc7e0247101dfa41c2823051f5e3
              • MD5 SHA1 SHA512 SSDEEP TLSH

              swresample-6.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\swresample-6.dll
              • Size 191KB
              • SHA256 999674324c39f1c9ed41ced9c6a67fef7703dfb1431bdf2096f4e362ad7e3f83
              • MD5 SHA1 SHA512 SSDEEP TLSH

              wz264.dll

              • Path C:\Users\Admin\AppData\Local\Temp\unpacksos\1\wz264.dll
              • Size 1.1MB
              • SHA256 29843f6d85c8c9fc09f97c7ac1281abb57e1cce81527278712763c654b83bfbd
              • MD5 SHA1 SHA512 SSDEEP TLSH