Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240611-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-06-2024 01:31

General

  • Target

    5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd.exe

  • Size

    290KB

  • MD5

    985584f5b7be5d605c1264624f4bd68e

  • SHA1

    8efbf3680021b3fb3b68094ee5296dcabb5abc1a

  • SHA256

    5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd

  • SHA512

    e6c582d168f066c031161b8b098114edd95f5fde5c70eb1e8150fb44fd3520a4be7e9e71195c3c58078d7b9802e053ffa3e452a87965eb9e6a0ac580ccd8e34b

  • SSDEEP

    3072:NNnq5gpiR+cS7kBapQOm47e6rGyQqKCHRsJFULJtkSUyHbmcnTVaz42JVOrTKYj:rq5gN70xee6treFD7y7mcnTVaBJVOrT

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) 2 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd.exe
    "C:\Users\Admin\AppData\Local\Temp\5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2696
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ruhcradf\
      2⤵
        PID:3684
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe" C:\Windows\SysWOW64\ruhcradf\
        2⤵
          PID:4624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ruhcradf binPath= "C:\Windows\SysWOW64\ruhcradf\ybyrikeu.exe /d\"C:\Users\Admin\AppData\Local\Temp\5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3056
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ruhcradf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ruhcradf
          2⤵
          • Launches sc.exe
          PID:3504
        • 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:424
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2696 -s 672
          2⤵
          • Program crash
          PID:3256
      • C:\Windows\SysWOW64\ruhcradf\ybyrikeu.exe
        C:\Windows\SysWOW64\ruhcradf\ybyrikeu.exe /d"C:\Users\Admin\AppData\Local\Temp\5496d968b378eef69af5eb89159bc728b8ad9e395e42c74f788a4b7a8ec8a7bd.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:116
        • 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:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 116 -s 508
          2⤵
          • Program crash
          PID:1532
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 116 -ip 116
        1⤵
          PID:2656
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2696 -ip 2696
          1⤵
            PID:3724

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.7MB

            MD5

            f11c9bcb7a3f7da4f6619a6931442758

            SHA1

            655b9dab1a988bace7dcf5f679ff154298bff0ac

            SHA256

            17f68a4afd4df16b3ca973fea121bddd51c8844fc6cc3fbdc88348f356d823a6

            SHA512

            03e11137d4808ed8f1486a614dacd242467f6ee1c10e43f56dc1be074e0fdae19b002bad605f033fdb3a9104c879c95d1bed660fe236b7962d9f99d54fa031af

          • memory/116-14-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/116-8-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/1836-35-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-25-0x0000000001D80000-0x0000000001D86000-memory.dmp

            Filesize

            24KB

          • memory/1836-9-0x00000000007C0000-0x00000000007D5000-memory.dmp

            Filesize

            84KB

          • memory/1836-44-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-60-0x00000000007C0000-0x00000000007D5000-memory.dmp

            Filesize

            84KB

          • memory/1836-43-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-28-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-22-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1836-18-0x00000000007C0000-0x00000000007D5000-memory.dmp

            Filesize

            84KB

          • memory/1836-19-0x00000000007C0000-0x00000000007D5000-memory.dmp

            Filesize

            84KB

          • memory/1836-55-0x0000000007600000-0x0000000007A0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1836-56-0x0000000001DF0000-0x0000000001DF7000-memory.dmp

            Filesize

            28KB

          • memory/1836-52-0x0000000007600000-0x0000000007A0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1836-51-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

            Filesize

            20KB

          • memory/1836-48-0x0000000001DE0000-0x0000000001DE5000-memory.dmp

            Filesize

            20KB

          • memory/1836-47-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-46-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-45-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-12-0x00000000007C0000-0x00000000007D5000-memory.dmp

            Filesize

            84KB

          • memory/1836-24-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1836-41-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-42-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-40-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-39-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-38-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-37-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-36-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-31-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-34-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-33-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/1836-32-0x0000000001D90000-0x0000000001DA0000-memory.dmp

            Filesize

            64KB

          • memory/2696-1-0x0000000000530000-0x0000000000630000-memory.dmp

            Filesize

            1024KB

          • memory/2696-3-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2696-16-0x0000000000780000-0x0000000000793000-memory.dmp

            Filesize

            76KB

          • memory/2696-17-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2696-15-0x0000000000400000-0x000000000045A000-memory.dmp

            Filesize

            360KB

          • memory/2696-2-0x0000000000780000-0x0000000000793000-memory.dmp

            Filesize

            76KB