Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/09/2024, 20:19

General

  • Target

    49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007.exe

  • Size

    422KB

  • MD5

    c9f9c516072359c5972d75337e89e790

  • SHA1

    00ac567dbe103901dc06e751802d937de1be9fff

  • SHA256

    49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007

  • SHA512

    db56e058b456f85dcccf794d1cc9b0783b59f6f952e194aac013b4ad1b3d8116154d6be0b950a59a618bd30fd8ae0cd2b6f54e5e84628a4bf64f98106fbbc474

  • SSDEEP

    6144:4Cr9TDbMssgvbE5i8q2DNnWOFOMpoxAHg3s:4e9TDbxHba22F0xAHg

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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • 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.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007.exe
    "C:\Users\Admin\AppData\Local\Temp\49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1312
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cmsrdvbq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:748
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hovynbue.exe" C:\Windows\SysWOW64\cmsrdvbq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3208
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create cmsrdvbq binPath= "C:\Windows\SysWOW64\cmsrdvbq\hovynbue.exe /d\"C:\Users\Admin\AppData\Local\Temp\49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2704
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description cmsrdvbq "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2872
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start cmsrdvbq
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:860
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:3272
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1312 -s 1240
      2⤵
      • Program crash
      PID:1700
  • C:\Windows\SysWOW64\cmsrdvbq\hovynbue.exe
    C:\Windows\SysWOW64\cmsrdvbq\hovynbue.exe /d"C:\Users\Admin\AppData\Local\Temp\49f08a77eedd5d5bf948d6c15688b04618296250793439928c9ba926bf758007.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3960
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:4796
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3960 -s 516
      2⤵
      • Program crash
      PID:3732
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1312 -ip 1312
    1⤵
      PID:4312
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3960 -ip 3960
      1⤵
        PID:3696

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        12.1MB

        MD5

        fe268f3fccd08690cf02df2d37e06dc5

        SHA1

        08e9e530c122bce85b100319998fa5560727a0b9

        SHA256

        4a10c6bd5fab2a9fcebe90c81e1e011903fef878b9f314c2ace685b9bca05bbd

        SHA512

        285e77837c114e7b09daacb419b6a959b81ec62738d5af146b2342e8ff4cf8b4ce6dba5bae19f5238666ed667880bcc0769460ee7d824f0f93d24c0ac5c34983

      • memory/1312-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

        Filesize

        1024KB

      • memory/1312-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1312-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1312-8-0x00000000007C0000-0x00000000007D3000-memory.dmp

        Filesize

        76KB

      • memory/1312-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/1312-2-0x00000000007C0000-0x00000000007D3000-memory.dmp

        Filesize

        76KB

      • memory/3960-17-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3960-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/3960-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4796-45-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-38-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-15-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4796-19-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/4796-49-0x00000000017D0000-0x00000000017D5000-memory.dmp

        Filesize

        20KB

      • memory/4796-53-0x0000000007000000-0x000000000740B000-memory.dmp

        Filesize

        4.0MB

      • memory/4796-50-0x0000000007000000-0x000000000740B000-memory.dmp

        Filesize

        4.0MB

      • memory/4796-46-0x00000000017D0000-0x00000000017D5000-memory.dmp

        Filesize

        20KB

      • memory/4796-13-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4796-44-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-43-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-42-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-41-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-40-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-39-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-16-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/4796-37-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-36-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-35-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-34-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-33-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-32-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-31-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-30-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-29-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-26-0x00000000017C0000-0x00000000017D0000-memory.dmp

        Filesize

        64KB

      • memory/4796-23-0x00000000005F0000-0x00000000005F6000-memory.dmp

        Filesize

        24KB

      • memory/4796-22-0x0000000002000000-0x000000000220F000-memory.dmp

        Filesize

        2.1MB

      • memory/4796-54-0x00000000017E0000-0x00000000017E7000-memory.dmp

        Filesize

        28KB