Analysis

  • max time kernel
    154s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:32

General

  • Target

    d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879.exe

  • Size

    291KB

  • MD5

    3fff6b68ec9d18f01572e95e28bcda01

  • SHA1

    8e882c3a22ced47fb0d1ef77e5b4fa929c1fb2c1

  • SHA256

    d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879

  • SHA512

    2a8ad523c74dc5c52ec6f817779254bb8b89efbcede5d1e4cdce256e040ac98e9e9b477f25a41d26d837d43facaf20ee651607e3113f3b58ad32789e031cea73

  • SSDEEP

    3072:Eb8yXVzi6JLd9LBOr59azRrCLneVsXJnEmtGHJ/JVeECaCb7HBr4u0hlb6C:lMiULdVsV9azRkRX9FupfevbTBdop6

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

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

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879.exe
    "C:\Users\Admin\AppData\Local\Temp\d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2548
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dkbncgb\
      2⤵
        PID:3768
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rdliobhf.exe" C:\Windows\SysWOW64\dkbncgb\
        2⤵
          PID:3848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dkbncgb binPath= "C:\Windows\SysWOW64\dkbncgb\rdliobhf.exe /d\"C:\Users\Admin\AppData\Local\Temp\d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dkbncgb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dkbncgb
          2⤵
          • Launches sc.exe
          PID:1892
        • 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:2216
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2548 -s 656
          2⤵
          • Program crash
          PID:400
      • C:\Windows\SysWOW64\dkbncgb\rdliobhf.exe
        C:\Windows\SysWOW64\dkbncgb\rdliobhf.exe /d"C:\Users\Admin\AppData\Local\Temp\d44236eeb92cc872600b3d0ae889c11912c1bb08c9a0f9c1657c9e2d58466879.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2108
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4812
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2108 -s 516
          2⤵
          • Program crash
          PID:2088
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2548 -ip 2548
        1⤵
          PID:5096
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 2108 -ip 2108
          1⤵
            PID:928
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3776 --field-trial-handle=3088,i,14310325015283915034,7660943942870463106,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:2364

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\rdliobhf.exe
              Filesize

              13.2MB

              MD5

              00c3ebb7ee070983c40f939b09fa2aef

              SHA1

              f1d325efb1107dc53bf9ba82bbd47dc01d3bea30

              SHA256

              135aa1e4a12a04e207ee9096a81a992a2a1aae21ccf0c34df8c4067833f86982

              SHA512

              b9190ffd96681bc3aceb05f5d81242f9a1a2d3028f34a6597a290520a0995af4f95a046e733bda9a8a772345ead4b9da7204d5782f783e6ee645bc15873de3a4

            • memory/2108-20-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2108-15-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2108-13-0x0000000000A70000-0x0000000000B70000-memory.dmp
              Filesize

              1024KB

            • memory/2548-11-0x0000000002520000-0x0000000002533000-memory.dmp
              Filesize

              76KB

            • memory/2548-6-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2548-9-0x00000000007E0000-0x00000000008E0000-memory.dmp
              Filesize

              1024KB

            • memory/2548-10-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2548-1-0x00000000007E0000-0x00000000008E0000-memory.dmp
              Filesize

              1024KB

            • memory/2548-4-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2548-3-0x0000000000400000-0x00000000007D2000-memory.dmp
              Filesize

              3.8MB

            • memory/2548-2-0x0000000002520000-0x0000000002533000-memory.dmp
              Filesize

              76KB

            • memory/4812-14-0x00000000008E0000-0x00000000008F5000-memory.dmp
              Filesize

              84KB

            • memory/4812-18-0x00000000008E0000-0x00000000008F5000-memory.dmp
              Filesize

              84KB

            • memory/4812-19-0x00000000008E0000-0x00000000008F5000-memory.dmp
              Filesize

              84KB

            • memory/4812-21-0x00000000008E0000-0x00000000008F5000-memory.dmp
              Filesize

              84KB