Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:19

General

  • Target

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe

  • Size

    203KB

  • MD5

    d88f7c78b3be6c96c33b80a8e1bb85de

  • SHA1

    ce07fb26b0ec69cdf563f98560aa4f7f298e6e8d

  • SHA256

    755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9

  • SHA512

    1c396a26da383d01ddc317bc4c565c5825b0e452bcf262ac849cd720acb6cb7abcc08e895041e59246dd7686e72424990728745716815a5879bce30769e3e898

  • SSDEEP

    3072:Ef3B/ALaZdXUNc8iirJiM21K7uSbrF068c0E0rBNWRDxlH+cmH:Ef32clVO598c0EHxQco

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe
    "C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2240
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jhiwapxd\
      2⤵
        PID:2392
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brroamca.exe" C:\Windows\SysWOW64\jhiwapxd\
        2⤵
          PID:2620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jhiwapxd binPath= "C:\Windows\SysWOW64\jhiwapxd\brroamca.exe /d\"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2880
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jhiwapxd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jhiwapxd
          2⤵
          • Launches sc.exe
          PID:2596
        • 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:2552
      • C:\Windows\SysWOW64\jhiwapxd\brroamca.exe
        C:\Windows\SysWOW64\jhiwapxd\brroamca.exe /d"C:\Users\Admin\AppData\Local\Temp\755b1b45c26d282f094d504074bbdf897f6460968db67dd7d88a4702e03ef7f9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3052
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2832

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        14.7MB

        MD5

        67b2f1a94a90d8179ffe93f2af66a65c

        SHA1

        619e0231dc136fd9ab18fe24085453d791f7312a

        SHA256

        c5320d533d12175b2fe0ced51292ceac78a8d59ae39d391965dd681add4dd330

        SHA512

        deb2d9cf112413e7123ea8f47fbef8aa7b11f0f22c062919ada0342f97e0a622c2947488218ead4fdd0ec4b488de09a8e044f6f1f6d7e828f860c617a53856d8

      • memory/2240-18-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/2240-1-0x0000000000550000-0x0000000000650000-memory.dmp
        Filesize

        1024KB

      • memory/2240-4-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/2240-3-0x0000000000230000-0x0000000000243000-memory.dmp
        Filesize

        76KB

      • memory/2832-34-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-38-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-61-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2832-10-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-17-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-57-0x00000000004B0000-0x00000000004B7000-memory.dmp
        Filesize

        28KB

      • memory/2832-19-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-20-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-22-0x00000000019B0000-0x0000000001BBF000-memory.dmp
        Filesize

        2.1MB

      • memory/2832-25-0x00000000019B0000-0x0000000001BBF000-memory.dmp
        Filesize

        2.1MB

      • memory/2832-26-0x0000000000080000-0x0000000000086000-memory.dmp
        Filesize

        24KB

      • memory/2832-29-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-32-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-35-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-56-0x00000000058F0000-0x0000000005CFB000-memory.dmp
        Filesize

        4.0MB

      • memory/2832-37-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-13-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2832-36-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-33-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-39-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-40-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-41-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-42-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-43-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-49-0x0000000000320000-0x0000000000325000-memory.dmp
        Filesize

        20KB

      • memory/2832-48-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-47-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-46-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-45-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-44-0x00000000002C0000-0x00000000002D0000-memory.dmp
        Filesize

        64KB

      • memory/2832-52-0x0000000000320000-0x0000000000325000-memory.dmp
        Filesize

        20KB

      • memory/2832-53-0x00000000058F0000-0x0000000005CFB000-memory.dmp
        Filesize

        4.0MB

      • memory/3052-8-0x00000000005A0000-0x00000000006A0000-memory.dmp
        Filesize

        1024KB

      • memory/3052-9-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB

      • memory/3052-16-0x0000000000400000-0x0000000000438000-memory.dmp
        Filesize

        224KB