Analysis

  • max time kernel
    148s
  • max time network
    151s
  • 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 13:32

General

  • Target

    466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe

  • Size

    317KB

  • MD5

    8cc6aec77fca66fc44286a1519bae1ee

  • SHA1

    35b395341b0b103bf511d653b05921dc89370a65

  • SHA256

    466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c

  • SHA512

    de7e960bd1204ef301828d970764e2161cef622d529db3f8f3b001656ed01dc9d890b6e9ef385ebf0f57187fb9c62c064b8804d800a685dec9fa715fcfe3bd51

  • SSDEEP

    6144:03BH8F8MzN7YBmGXZrNcyzpulx2x1dmv56:0xH8OMzWBLZ+yzQ3srW4

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe
    "C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3060
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sumwvkop\
      2⤵
        PID:4796
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uotrmpmo.exe" C:\Windows\SysWOW64\sumwvkop\
        2⤵
          PID:4628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sumwvkop binPath= "C:\Windows\SysWOW64\sumwvkop\uotrmpmo.exe /d\"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:412
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description sumwvkop "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start sumwvkop
          2⤵
          • Launches sc.exe
          PID:3440
        • 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:1316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3060 -s 1036
          2⤵
          • Program crash
          PID:540
      • C:\Windows\SysWOW64\sumwvkop\uotrmpmo.exe
        C:\Windows\SysWOW64\sumwvkop\uotrmpmo.exe /d"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4472
        • 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:544
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4472 -s 248
          2⤵
          • Program crash
          PID:4800
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3060 -ip 3060
        1⤵
          PID:3436
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 4472 -ip 4472
          1⤵
            PID:1180

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            11.7MB

            MD5

            48e5a0702fb3274d7503845c3da57c0e

            SHA1

            8210cefa537e17e683d2e399dbb0b21078cb8619

            SHA256

            f673e28c1f86fd12b0ef1a8abce6128ec494baa6655fba4ac0f3fc44793745b6

            SHA512

            c50b2e3eae7cf25aa8acc8911b79d6ab56bd356ee6d45d247deca50b10b98ea50740ef7d56775cf3711fcb1bc6fca5923166319e5987d3c4832bcc4f7754800e

          • memory/544-31-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-42-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-56-0x00000000029F0000-0x00000000029F7000-memory.dmp
            Filesize

            28KB

          • memory/544-33-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-52-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-51-0x00000000029E0000-0x00000000029E5000-memory.dmp
            Filesize

            20KB

          • memory/544-11-0x0000000000670000-0x0000000000685000-memory.dmp
            Filesize

            84KB

          • memory/544-48-0x00000000029E0000-0x00000000029E5000-memory.dmp
            Filesize

            20KB

          • memory/544-15-0x0000000000670000-0x0000000000685000-memory.dmp
            Filesize

            84KB

          • memory/544-16-0x0000000000670000-0x0000000000685000-memory.dmp
            Filesize

            84KB

          • memory/544-46-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-18-0x0000000000670000-0x0000000000685000-memory.dmp
            Filesize

            84KB

          • memory/544-20-0x0000000000670000-0x0000000000685000-memory.dmp
            Filesize

            84KB

          • memory/544-34-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-24-0x0000000002480000-0x000000000268F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-25-0x00000000009F0000-0x00000000009F6000-memory.dmp
            Filesize

            24KB

          • memory/544-28-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-32-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-55-0x0000000007500000-0x000000000790B000-memory.dmp
            Filesize

            4.0MB

          • memory/544-47-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-21-0x0000000002480000-0x000000000268F000-memory.dmp
            Filesize

            2.1MB

          • memory/544-36-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-37-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-35-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-38-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-39-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-40-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-41-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-45-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-43-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/544-44-0x00000000027D0000-0x00000000027E0000-memory.dmp
            Filesize

            64KB

          • memory/3060-4-0x0000000000400000-0x00000000007D9000-memory.dmp
            Filesize

            3.8MB

          • memory/3060-1-0x0000000000860000-0x0000000000960000-memory.dmp
            Filesize

            1024KB

          • memory/3060-8-0x0000000002520000-0x0000000002533000-memory.dmp
            Filesize

            76KB

          • memory/3060-7-0x0000000000400000-0x00000000007D9000-memory.dmp
            Filesize

            3.8MB

          • memory/3060-2-0x0000000002520000-0x0000000002533000-memory.dmp
            Filesize

            76KB

          • memory/4472-17-0x0000000000400000-0x00000000007D9000-memory.dmp
            Filesize

            3.8MB

          • memory/4472-12-0x0000000000400000-0x00000000007D9000-memory.dmp
            Filesize

            3.8MB

          • memory/4472-10-0x00000000008E0000-0x00000000009E0000-memory.dmp
            Filesize

            1024KB