Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 12:25

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.

  • 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\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe
    "C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1244
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aatgdzhy\
      2⤵
        PID:1740
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dbqyrhcy.exe" C:\Windows\SysWOW64\aatgdzhy\
        2⤵
          PID:2628
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create aatgdzhy binPath= "C:\Windows\SysWOW64\aatgdzhy\dbqyrhcy.exe /d\"C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2812
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description aatgdzhy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start aatgdzhy
          2⤵
          • Launches sc.exe
          PID:2604
        • 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:2496
      • C:\Windows\SysWOW64\aatgdzhy\dbqyrhcy.exe
        C:\Windows\SysWOW64\aatgdzhy\dbqyrhcy.exe /d"C:\Users\Admin\AppData\Local\Temp\b09798c07fc468fb557b044326305a10d5b4a7b19c0d6adb88f794990c3634b9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2500
        • 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:2484

      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\dbqyrhcy.exe
        Filesize

        10.9MB

        MD5

        23981bfac9c8c339499250c595d7a08e

        SHA1

        41aa380baf8cdfccf310601621411ad638b4305b

        SHA256

        0128590d7986c32dd35c62367e21662928c761d1e45fc49f6e064eae2fa85d18

        SHA512

        ecd8e6bdd160db694fd43ad8d2a049f5658691c3f217a4c2f3de9f95484a87a66a1c274c5969651d4ab43420442e5e5757942a18c3d0f524b8d6308f7ebca145

      • memory/1244-1-0x0000000000A30000-0x0000000000B30000-memory.dmp
        Filesize

        1024KB

      • memory/1244-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1244-4-0x0000000000400000-0x0000000000869000-memory.dmp
        Filesize

        4.4MB

      • memory/1244-8-0x0000000000400000-0x0000000000869000-memory.dmp
        Filesize

        4.4MB

      • memory/1244-10-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1244-9-0x0000000000A30000-0x0000000000B30000-memory.dmp
        Filesize

        1024KB

      • memory/2484-35-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-39-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-14-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2484-13-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2484-16-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2484-63-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2484-21-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2484-22-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2484-24-0x0000000001A60000-0x0000000001C6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2484-27-0x0000000001A60000-0x0000000001C6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2484-28-0x00000000000A0000-0x00000000000A6000-memory.dmp
        Filesize

        24KB

      • memory/2484-31-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-34-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-59-0x0000000000180000-0x0000000000187000-memory.dmp
        Filesize

        28KB

      • memory/2484-36-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-37-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-38-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-58-0x0000000005440000-0x000000000584B000-memory.dmp
        Filesize

        4.0MB

      • memory/2484-40-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-41-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-42-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-43-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-44-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-45-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-46-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-47-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-48-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-49-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-50-0x00000000000B0000-0x00000000000C0000-memory.dmp
        Filesize

        64KB

      • memory/2484-51-0x00000000000C0000-0x00000000000C5000-memory.dmp
        Filesize

        20KB

      • memory/2484-54-0x00000000000C0000-0x00000000000C5000-memory.dmp
        Filesize

        20KB

      • memory/2484-55-0x0000000005440000-0x000000000584B000-memory.dmp
        Filesize

        4.0MB

      • memory/2500-12-0x0000000000400000-0x0000000000869000-memory.dmp
        Filesize

        4.4MB

      • memory/2500-11-0x00000000009E0000-0x0000000000AE0000-memory.dmp
        Filesize

        1024KB

      • memory/2500-18-0x0000000000400000-0x0000000000869000-memory.dmp
        Filesize

        4.4MB