Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe

  • Size

    228KB

  • MD5

    aaa0a9ec9406d0974aad08aa5a36927a

  • SHA1

    dfef2eaa4d1b0db6711e0fd83b368eedc7aee3ff

  • SHA256

    648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d

  • SHA512

    e649a25fc6c77a3efbe2c258f28b853bbe65d362f375f5e64841f51b9ee8f6d1bb3fe3f3d7c3d95c9b7afd48e66ec318b5eb6a07a37f13c1cf3465855639eb08

  • SSDEEP

    3072:R4FLaaaoeUUG4JiE/Tt+/uFQEgytIFoNtaX9jFaTJJrnOMO2ktcqDXGI2RQ9lV7o:SFLav/Gs/XgyCFo/aX9OhnX8JV0

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 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe
    "C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:448
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ozhgzjke\
      2⤵
        PID:1896
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yokzumks.exe" C:\Windows\SysWOW64\ozhgzjke\
        2⤵
          PID:4968
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ozhgzjke binPath= "C:\Windows\SysWOW64\ozhgzjke\yokzumks.exe /d\"C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3168
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ozhgzjke "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ozhgzjke
          2⤵
          • Launches sc.exe
          PID:5000
        • 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:3520
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 448 -s 1040
          2⤵
          • Program crash
          PID:952
      • C:\Windows\SysWOW64\ozhgzjke\yokzumks.exe
        C:\Windows\SysWOW64\ozhgzjke\yokzumks.exe /d"C:\Users\Admin\AppData\Local\Temp\648bec40870a8c3abce34fcf5924fcdb02601d7b5561aca406808649ff164a6d.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2244
        • 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:4724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2244 -s 532
          2⤵
          • Program crash
          PID:3076
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 448 -ip 448
        1⤵
          PID:4948
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2244 -ip 2244
          1⤵
            PID:3660

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            13.5MB

            MD5

            346a4d0ca435b40359fd14c9f947f52c

            SHA1

            d18b1148f4024c412297a4501df8adb14ee3afe5

            SHA256

            7a73f6548954919920ed4627f1deeb0e8710446dba6176bcedff453cf61a4149

            SHA512

            1eed9c98d0b6b26200377e1903b1a876c781a1fb207825d4c80f410a8d0aa4d00173f12ad7bc343acaca0f95514aa91b3c480dbb1565fabb78b0d49d8e78937d

          • memory/448-2-0x0000000002180000-0x0000000002193000-memory.dmp

            Filesize

            76KB

          • memory/448-4-0x0000000000400000-0x000000000043F000-memory.dmp

            Filesize

            252KB

          • memory/448-7-0x0000000000400000-0x000000000043F000-memory.dmp

            Filesize

            252KB

          • memory/448-8-0x0000000002180000-0x0000000002193000-memory.dmp

            Filesize

            76KB

          • memory/448-1-0x0000000000510000-0x0000000000610000-memory.dmp

            Filesize

            1024KB

          • memory/2244-17-0x0000000000400000-0x000000000043F000-memory.dmp

            Filesize

            252KB

          • memory/2244-10-0x0000000000530000-0x0000000000630000-memory.dmp

            Filesize

            1024KB

          • memory/2244-11-0x0000000000400000-0x000000000043F000-memory.dmp

            Filesize

            252KB

          • memory/4724-33-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-35-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-15-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/4724-18-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/4724-20-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/4724-21-0x0000000002D40000-0x0000000002F4F000-memory.dmp

            Filesize

            2.1MB

          • memory/4724-24-0x0000000002D40000-0x0000000002F4F000-memory.dmp

            Filesize

            2.1MB

          • memory/4724-25-0x00000000023F0000-0x00000000023F6000-memory.dmp

            Filesize

            24KB

          • memory/4724-28-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-31-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-32-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-12-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/4724-34-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-36-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-37-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-16-0x0000000000D40000-0x0000000000D55000-memory.dmp

            Filesize

            84KB

          • memory/4724-38-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-39-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-40-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-41-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-42-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-43-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-44-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-46-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-45-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-47-0x0000000002F50000-0x0000000002F60000-memory.dmp

            Filesize

            64KB

          • memory/4724-48-0x00000000031E0000-0x00000000031E5000-memory.dmp

            Filesize

            20KB

          • memory/4724-51-0x00000000031E0000-0x00000000031E5000-memory.dmp

            Filesize

            20KB

          • memory/4724-52-0x0000000007C40000-0x000000000804B000-memory.dmp

            Filesize

            4.0MB

          • memory/4724-55-0x0000000007C40000-0x000000000804B000-memory.dmp

            Filesize

            4.0MB

          • memory/4724-56-0x00000000031F0000-0x00000000031F7000-memory.dmp

            Filesize

            28KB