Analysis

  • max time kernel
    148s
  • max time network
    155s
  • 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 13:14

General

  • Target

    b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe

  • Size

    281KB

  • MD5

    45c66a2034297abfc6b5543dfbac04f2

  • SHA1

    21aea98d43c6d0aa86b8ee1777cc51cfae5a634f

  • SHA256

    b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9

  • SHA512

    a341910130e4a040f02405c553556851cddf6ac2396f7e0d38aa0c7a97894aa9dece5cb9a7ce323bb50f221cfbc27d29641a4ccdc4843af09f9f54a14e6c19ce

  • SSDEEP

    3072:auyDaJPZdL7cHeyf3XJ+rs+MlhxMMKe4uquK9RbPf65xfzW5ffXq3B1k48cV1JD2:auyWJDLwHzf8412Mebd36/fkfAB1pJd

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe
    "C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2772
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ngbcqxxl\
      2⤵
        PID:5096
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pewdigld.exe" C:\Windows\SysWOW64\ngbcqxxl\
        2⤵
          PID:3748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ngbcqxxl binPath= "C:\Windows\SysWOW64\ngbcqxxl\pewdigld.exe /d\"C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ngbcqxxl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ngbcqxxl
          2⤵
          • Launches sc.exe
          PID:2752
        • 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:940
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2772 -s 592
          2⤵
          • Program crash
          PID:1108
      • C:\Windows\SysWOW64\ngbcqxxl\pewdigld.exe
        C:\Windows\SysWOW64\ngbcqxxl\pewdigld.exe /d"C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4548
        • 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:1708
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4548 -s 536
          2⤵
          • Program crash
          PID:4808
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2772 -ip 2772
        1⤵
          PID:716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 4548 -ip 4548
          1⤵
            PID:1852

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.3MB

            MD5

            b88a09b6a36dcdeabd2adca8cd9ceabb

            SHA1

            3397bd0693952b4df36eb9cb78112417c7d9a1de

            SHA256

            4b3238688436374be32978b95796494ebbd719d6b41f34380551749a4ce63fe6

            SHA512

            1c85262dbca436415b4045e0d2d452dfe2a49f2bb5a44e930ba6ee869f308ca2d959db3fdc699db4c503b2b3667248802671a8922bf6ab4d9b8e617ec48cebe3

          • memory/1708-34-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-44-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-60-0x0000000000990000-0x00000000009A5000-memory.dmp

            Filesize

            84KB

          • memory/1708-33-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-55-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/1708-52-0x0000000007780000-0x0000000007B8B000-memory.dmp

            Filesize

            4.0MB

          • memory/1708-51-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/1708-47-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-12-0x0000000000990000-0x00000000009A5000-memory.dmp

            Filesize

            84KB

          • memory/1708-17-0x0000000000990000-0x00000000009A5000-memory.dmp

            Filesize

            84KB

          • memory/1708-46-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-19-0x0000000000990000-0x00000000009A5000-memory.dmp

            Filesize

            84KB

          • memory/1708-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1708-35-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-25-0x0000000001F40000-0x0000000001F46000-memory.dmp

            Filesize

            24KB

          • memory/1708-28-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-31-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-32-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-56-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

            Filesize

            28KB

          • memory/1708-48-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

            Filesize

            20KB

          • memory/1708-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/1708-36-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-37-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-38-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-40-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-39-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-41-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-42-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-45-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/1708-43-0x0000000001F50000-0x0000000001F60000-memory.dmp

            Filesize

            64KB

          • memory/2772-4-0x0000000000400000-0x0000000000869000-memory.dmp

            Filesize

            4.4MB

          • memory/2772-1-0x0000000000AC0000-0x0000000000BC0000-memory.dmp

            Filesize

            1024KB

          • memory/2772-10-0x0000000000A10000-0x0000000000A23000-memory.dmp

            Filesize

            76KB

          • memory/2772-9-0x0000000000400000-0x0000000000869000-memory.dmp

            Filesize

            4.4MB

          • memory/2772-6-0x0000000000400000-0x0000000000869000-memory.dmp

            Filesize

            4.4MB

          • memory/2772-2-0x0000000000A10000-0x0000000000A23000-memory.dmp

            Filesize

            76KB

          • memory/4548-18-0x0000000000400000-0x0000000000869000-memory.dmp

            Filesize

            4.4MB

          • memory/4548-13-0x0000000000400000-0x0000000000869000-memory.dmp

            Filesize

            4.4MB

          • memory/4548-11-0x00000000009C0000-0x0000000000AC0000-memory.dmp

            Filesize

            1024KB