Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    07-09-2024 09:30

General

  • Target

    2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe

  • Size

    239KB

  • MD5

    002356e241ed93062ea8cf0c80e250de

  • SHA1

    e81f528cd1f782c03943f48d9c8496c60ae3433f

  • SHA256

    2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d

  • SHA512

    dcdc74eb2307329fdc3d00c4848e890c6f10f79ebea475efd0991aaf6a2ad46afb26ada642ff46e00d7cae491341a05d8f6622aae8695273d55e5e34921ede93

  • SSDEEP

    6144:MnucMBiyeneCyknMgs2Mkv/MJ0Vdh1tQ:Jc4iye5nS2MkrVdz

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
  • 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe
    "C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3904
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sopnuyvp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1212
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xrwupspr.exe" C:\Windows\SysWOW64\sopnuyvp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2920
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create sopnuyvp binPath= "C:\Windows\SysWOW64\sopnuyvp\xrwupspr.exe /d\"C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4108
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description sopnuyvp "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1476
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start sopnuyvp
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1996
    • 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:4448
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3904 -s 1096
      2⤵
      • Program crash
      PID:4912
  • C:\Windows\SysWOW64\sopnuyvp\xrwupspr.exe
    C:\Windows\SysWOW64\sopnuyvp\xrwupspr.exe /d"C:\Users\Admin\AppData\Local\Temp\2779351a1b414beaa4082cf515986f42005dbded271630ec4f7c97efdff85b8d.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5016
    • 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:3964
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5016 -s 580
      2⤵
      • Program crash
      PID:2224
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3904 -ip 3904
    1⤵
      PID:764
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 5016 -ip 5016
      1⤵
        PID:3848

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.8MB

        MD5

        d1cc8a6ae912a4aff2deb72ab34c15f5

        SHA1

        4dfc7cb069c55d2ea15b134d694c7b225bb1a28d

        SHA256

        1b3f8c257c897bb71cd1274ced8a9e1c801dc40986b8d512dd089af4c3dbbe81

        SHA512

        837398e814e9ac57ec0af59f5e321e9010ed8b7df863d151d5c9e2254b7e9348a303d96c992524c3ffd23760f9675fca242e7a27ee54099dd63b2ec0c401d52b

      • memory/3904-1-0x00000000005B0000-0x00000000006B0000-memory.dmp

        Filesize

        1024KB

      • memory/3904-2-0x00000000022C0000-0x00000000022D3000-memory.dmp

        Filesize

        76KB

      • memory/3904-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3904-8-0x00000000022C0000-0x00000000022D3000-memory.dmp

        Filesize

        76KB

      • memory/3904-7-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB

      • memory/3904-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3964-34-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-40-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-51-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3964-13-0x0000000000C40000-0x0000000000C55000-memory.dmp

        Filesize

        84KB

      • memory/3964-38-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-29-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-17-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3964-21-0x00000000021B0000-0x00000000021B6000-memory.dmp

        Filesize

        24KB

      • memory/3964-47-0x00000000021D0000-0x00000000021D5000-memory.dmp

        Filesize

        20KB

      • memory/3964-52-0x00000000021E0000-0x00000000021E7000-memory.dmp

        Filesize

        28KB

      • memory/3964-48-0x0000000007900000-0x0000000007D0B000-memory.dmp

        Filesize

        4.0MB

      • memory/3964-44-0x00000000021D0000-0x00000000021D5000-memory.dmp

        Filesize

        20KB

      • memory/3964-43-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-42-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-41-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-14-0x0000000000C40000-0x0000000000C55000-memory.dmp

        Filesize

        84KB

      • memory/3964-39-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-37-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-36-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-35-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-11-0x0000000000C40000-0x0000000000C55000-memory.dmp

        Filesize

        84KB

      • memory/3964-33-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-32-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-31-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-30-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-28-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-27-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-24-0x00000000021C0000-0x00000000021D0000-memory.dmp

        Filesize

        64KB

      • memory/3964-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/5016-15-0x0000000000400000-0x0000000000443000-memory.dmp

        Filesize

        268KB