Analysis

  • max time kernel
    92s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-08-2024 11:31

General

  • Target

    letsvpn-latest.exe

  • Size

    16.0MB

  • MD5

    e1cf9a756ff25d917ebd93319557a2cf

  • SHA1

    cd4a308890f0c340d941d28e402e0d12e4757e47

  • SHA256

    c23bb815c8dbf7f0717743954374b33d0f4d8b0ea38ff9f04277db91b10c31b2

  • SHA512

    74ca44d3993c49a456eca174af216357910ee1b99861f6ffd84906831c802e34a0cc7d8b571e6cd4d9c99b83ff8a89c3c3e57d2b7f2790f17963f11fb0928932

  • SSDEEP

    393216:cMVhKO2IhWbf5F7Dt5KOZAMIXVyZtXrBuMgpx1W+k0DM:cMf2Iy5F7DmOCMPtBuPzW+

Malware Config

Signatures

  • FatalRat

    FatalRat is a modular infostealer family written in C++ first appearing in June 2021.

  • Fatal Rat payload 1 IoCs
  • ASPack v2.12-2.42 1 IoCs

    Detects executables packed with ASPack v2.12-2.42

  • Executes dropped EXE 6 IoCs
  • UPX packed file 9 IoCs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Program Files directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 9 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 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 35 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 50 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe
    "C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4892
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c set
      2⤵
        PID:1896
      • C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe
        PECMD**pecmd-cmd* PUTF -dd -skipb=960512 -len=15777341 "C:\Users\Admin\AppData\Local\Temp\~5177645199360135221.tmp",,C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe
        2⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:1504
      • C:\Users\Admin\AppData\Local\Temp\~2351677112895057980~\sg.tmp
        7zG_exe x "C:\Users\Admin\AppData\Local\Temp\~5177645199360135221.tmp" -y -aoa -o"C:\Program Files (x86)\Common Files\"
        2⤵
        • Executes dropped EXE
        • Drops file in Program Files directory
        • Suspicious use of AdjustPrivilegeToken
        PID:4100
      • C:\Program Files (x86)\Common Files\ubc.exe
        "C:\Program Files (x86)\Common Files\\ubc.exe"
        2⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Checks whether UAC is enabled
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3000
        • C:\Users\Public\Documents\sougou\V4.6.80\Bin\QTalk.exe
          C:\Users\Public\Documents\sougou\V4.6.80\Bin\QTalk.exe
          3⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2144
          • C:\Users\Public\Documents\sougou\spolsvt.exe
            C:\Users\Public\Documents\sougou\spolsvt.exe
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:3968
            • C:\Users\Public\Documents\dd\spolsvt.exe
              C:\Users\Public\Documents\dd\spolsvt.exe
              5⤵
              • Executes dropped EXE
              • System Location Discovery: System Language Discovery
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:3240
            • C:\Users\Public\Documents\uu\svcoth.exe
              C:\Users\Public\Documents\uu\svcoth.exe
              5⤵
              • Executes dropped EXE
              • System Location Discovery: System Language Discovery
              PID:2868
      • C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe
        PECMD**pecmd-cmd* EXEC -wd:C: -hide cmd /c "C:\Users\Admin\AppData\Local\Temp\~8781390663049655329.cmd"
        2⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4708
        • C:\Windows\SYSTEM32\cmd.exe
          cmd /c "C:\Users\Admin\AppData\Local\Temp\~8781390663049655329.cmd"
          3⤵
            PID:1728
        • C:\Users\Admin\AppData\Local\Temp\letsvpn-latest.exe
          PECMD**pecmd-cmd* EXEC -wd:C: -hide cmd /c "C:\Users\Admin\AppData\Local\Temp\~6908697070151061552.cmd"
          2⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:448
          • C:\Windows\SYSTEM32\cmd.exe
            cmd /c "C:\Users\Admin\AppData\Local\Temp\~6908697070151061552.cmd"
            3⤵
              PID:4836

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Program Files (x86)\Common Files\letsvpn-latest.exe

          Filesize

          14.5MB

          MD5

          9c44be4ceac0c983a812fd8459511fd0

          SHA1

          bd5aaad4acd523cd2855e8b50a8380365d81e041

          SHA256

          b6750a3631413d71d7ea10292a11e5d0560afb6ccd4ad4baa75d7dc80842f153

          SHA512

          372ddeb1045d49e8f98f17bccffb0e3edc2179e541f8a4493300517327e514c7bf64557250e0f84f7366310a3d7a58a8d5480596f9be075b3f5d9411a49b4d09

        • C:\Program Files (x86)\Common Files\ubc.exe

          Filesize

          761KB

          MD5

          80c469aef3c93b7062ee21d4dbd1f43f

          SHA1

          df5ddf2d4257e89941c57e4d935da424dfd839a7

          SHA256

          2ca06c6d19785bd5b9e8f05da99311fcaafd64384df164c1f06a33622aaa397b

          SHA512

          e868d2a4d54ee4e16e8fce35447029eb0317dd8da961cf6b44ac13504b1b9fa8046faaaca9d432cd132ef928c247de7a588d9f30fabb3fd8a61a2ee5475006d4

        • C:\Users\Admin\AppData\Local\Temp\~2351677112895057980~\sg.tmp

          Filesize

          715KB

          MD5

          7c4718943bd3f66ebdb47ccca72c7b1e

          SHA1

          f9edfaa7adb8fa528b2e61b2b251f18da10a6969

          SHA256

          4cc32d00338fc7b206a7c052297acf9ac304ae7de9d61a2475a116959c1524fc

          SHA512

          e18c40d646fa4948f90f7471da55489df431f255041ebb6dcef86346f91078c9b27894e27216a4b2fe2a1c5e501c7953c77893cf696930123d28a322d49e1516

        • C:\Users\Admin\AppData\Local\Temp\~5177645199360135221.tmp

          Filesize

          15.0MB

          MD5

          4bff5e3d2cee40de0b1f0d6ee79297c1

          SHA1

          84d75479fb973f427560383f9b7831800632d2cf

          SHA256

          45535bc6c6ee9a45d63d5dcd826b4f87f78ab4f7421757dafa7bb36010473991

          SHA512

          649d4aff33cfabec7380c8ee2a2b0725470527ec29dcf2a5818a60476dbbef03dc58fbade03437ccd16efdbd6bb2e91cf8ff3b25d134a0c5e71f03627b671263

        • C:\Users\Admin\AppData\Local\Temp\~6908697070151061552.cmd

          Filesize

          371B

          MD5

          4d9a1f423d5af5ab826fbe31a6e3ff96

          SHA1

          071ff69d5aed3502cad231c3bb61b41f80b11c1e

          SHA256

          eb9fddc125fcbadd7371e5b4668a92d0dd08739ba1437bebb693aa9fd62ff1b8

          SHA512

          65ac62c4cd32f2228db180f7b67c9d7299dd7fee5ec55e4e8ac9c500bb4c1f3364e6fcc420a2c9d10201e9bd6f88144e0f5287251e3acc96528a396927bba860

        • C:\Users\Admin\AppData\Local\Temp\~8781390663049655329.cmd

          Filesize

          319B

          MD5

          6fa45475403d315e37c76a45f4b8b50c

          SHA1

          45ceb42fb50cac58ea9123b9ac075ace33c41afd

          SHA256

          8ed7f3eef624d4eff5dc080c319d4feb6277c2ec06445e1cbc9129ad20654cd4

          SHA512

          c431253bae03309d3c033b1fb1b0e0093df28a79f028fe77c034b356684e0769c7db0c554dbffd79b4eabd82bbfbd13a059291386b1a39746e42fbfe4ccb4d99

        • C:\Users\Admin\AppData\Local\Temp\~~1895643959209536446.tmp

          Filesize

          121B

          MD5

          14240e0482c263f2485828562ac44205

          SHA1

          738a8685f89d6b829315003b96f6818927e6f7bb

          SHA256

          7d125b43b4179fe5a31073680c51fb71b942ddbdbc9cb310867c16863705aa6e

          SHA512

          d1f3b4919ce95fa2ca9b139e53e5f5896ddc2a2bd208e37e373ae8d955a8bc15de6682b86e2e19cb824823bcbabb66ed426c2cd1e05fc700fe19ded92fa882ee

        • C:\Users\Public\Documents\dd\spolsvt.exe

          Filesize

          16KB

          MD5

          cdce4713e784ae069d73723034a957ff

          SHA1

          9a393a6bab6568f1a774fb753353223f11367e09

          SHA256

          b29e48102ecb3d3614e8980a8b8cc63dd2b993c6346f466479244ec2b47b69d8

          SHA512

          0a3a59a305cc2a6fad4e1315b0bcc5a4129595dfe1e8b703363fa02528d2d7c48d3fd22d365708be84a5557cf1916873df9563c454732f93f94a66e7e3b9fb0f

        • C:\Users\Public\Documents\sougou\Mpec.mbt

          Filesize

          196KB

          MD5

          fc51b596793d77c284e29c7b1371c1e9

          SHA1

          af3bec0adbcb9ec9b10ed7c4f826fc5137d6db3f

          SHA256

          157507c0e3aaababdb6087104a9841995c1cd5b06991bccf192cba68cbfb2281

          SHA512

          e160812d3d8d33d2ca4df4177073e7a8dedfad443f49cd87316d049b1a9efcfe5de14d8aabb7c900a6b484181fe34a71f4ca70c31f7fcaf76679b649fffaa73d

        • C:\Users\Public\Documents\sougou\spolsvt.exe

          Filesize

          9KB

          MD5

          523d5c39f9d8d2375c3df68251fa2249

          SHA1

          d4ed365c44bec9246fc1a65a32a7791792647a10

          SHA256

          20e3dc90a3e83b6202e2a7f4603b60e5e859639cb68693426c400b13aaeabd78

          SHA512

          526e1bba30d03f1ac177c6ab7409187a730969c429cebef15da68ffcf44b3b93227781eebc827b2f7a0fa17c391e00a0e532263fd0167aeaeb0456f96cfe3ae4

        • memory/448-125-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/448-118-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/1504-9-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/1504-7-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/2144-62-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/2144-50-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/2868-92-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/2868-85-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/2868-86-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/2868-87-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/2868-88-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/2868-84-0x0000000000400000-0x000000000041C000-memory.dmp

          Filesize

          112KB

        • memory/3000-31-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/3000-32-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/3000-74-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/3000-33-0x0000000000401000-0x00000000004C1000-memory.dmp

          Filesize

          768KB

        • memory/3000-29-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/3000-30-0x0000000000400000-0x00000000005FA000-memory.dmp

          Filesize

          2.0MB

        • memory/3240-69-0x0000000000400000-0x0000000000430000-memory.dmp

          Filesize

          192KB

        • memory/3240-68-0x0000000000400000-0x0000000000430000-memory.dmp

          Filesize

          192KB

        • memory/3240-67-0x0000000000400000-0x0000000000430000-memory.dmp

          Filesize

          192KB

        • memory/3240-75-0x0000000010000000-0x000000001002A000-memory.dmp

          Filesize

          168KB

        • memory/3240-73-0x0000000000400000-0x0000000000430000-memory.dmp

          Filesize

          192KB

        • memory/3968-53-0x0000000000400000-0x0000000000441000-memory.dmp

          Filesize

          260KB

        • memory/3968-55-0x0000000000400000-0x0000000000441000-memory.dmp

          Filesize

          260KB

        • memory/3968-54-0x0000000000400000-0x0000000000441000-memory.dmp

          Filesize

          260KB

        • memory/3968-59-0x0000000000400000-0x0000000000441000-memory.dmp

          Filesize

          260KB

        • memory/4708-119-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/4708-123-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/4892-93-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/4892-121-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB

        • memory/4892-0-0x0000000000400000-0x0000000000562000-memory.dmp

          Filesize

          1.4MB