Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:35

General

  • Target

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe

  • Size

    233KB

  • MD5

    f81a2c93c44bfec11cdd55eb53dde5df

  • SHA1

    45cb3d7066113e86fff081e309265a797af0ef51

  • SHA256

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482

  • SHA512

    c9fc2a6239235aa0bf24e700665666c8500000bcc76dc8e26922f8cfc0f961949bf7fa04bf9877ea3254b9a5879752d1b3f75d945318c246770b507bc0b0199e

  • SSDEEP

    3072:LefNGJ/ceeYkb2BNog9oADOF4t0wC0NnpXIpKjVEqLDOO7n+MnIitmjXO9ZJwVQk:Le1GM+NobFm0wC0NpYpuVEqSFOTF

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\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe
    "C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2956
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vvdwqqok\
      2⤵
        PID:2324
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tazmuucg.exe" C:\Windows\SysWOW64\vvdwqqok\
        2⤵
          PID:2536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vvdwqqok binPath= "C:\Windows\SysWOW64\vvdwqqok\tazmuucg.exe /d\"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vvdwqqok "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2584
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vvdwqqok
          2⤵
          • Launches sc.exe
          PID:2552
        • 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:1640
      • C:\Windows\SysWOW64\vvdwqqok\tazmuucg.exe
        C:\Windows\SysWOW64\vvdwqqok\tazmuucg.exe /d"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2712
        • 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:2480

      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\tazmuucg.exe
        Filesize

        10.7MB

        MD5

        be1c3d603a00b33e5a7ae7e14ed3a4f5

        SHA1

        05985ce6ea176a5b5c15c95e513adbc6803ac454

        SHA256

        81f6c378da4847d5e3aaa20392e8c4ec8ea27890108cddc352015925cbe812c8

        SHA512

        353fea26db5671a14c5ae95989ab7f0c0581493098722a51c87b5005b6205a8360812eb053824ea323efcaa243668dcf5244153b4b0db3e418a0387be5283580

      • memory/2480-34-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-42-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-58-0x0000000000580000-0x0000000000587000-memory.dmp
        Filesize

        28KB

      • memory/2480-57-0x0000000005920000-0x0000000005D2B000-memory.dmp
        Filesize

        4.0MB

      • memory/2480-54-0x0000000005920000-0x0000000005D2B000-memory.dmp
        Filesize

        4.0MB

      • memory/2480-53-0x0000000000320000-0x0000000000325000-memory.dmp
        Filesize

        20KB

      • memory/2480-33-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2480-12-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2480-15-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2480-50-0x0000000000320000-0x0000000000325000-memory.dmp
        Filesize

        20KB

      • memory/2480-19-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2480-20-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2480-22-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2480-23-0x0000000001830000-0x0000000001A3F000-memory.dmp
        Filesize

        2.1MB

      • memory/2480-26-0x0000000001830000-0x0000000001A3F000-memory.dmp
        Filesize

        2.1MB

      • memory/2480-27-0x0000000000150000-0x0000000000156000-memory.dmp
        Filesize

        24KB

      • memory/2480-36-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-48-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-49-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-30-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-35-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-37-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-38-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-39-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-40-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-41-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-43-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-46-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-45-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-44-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2480-47-0x00000000002D0000-0x00000000002E0000-memory.dmp
        Filesize

        64KB

      • memory/2712-10-0x00000000005B0000-0x00000000006B0000-memory.dmp
        Filesize

        1024KB

      • memory/2712-16-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2712-11-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2956-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2956-1-0x00000000005D0000-0x00000000006D0000-memory.dmp
        Filesize

        1024KB

      • memory/2956-8-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2956-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2956-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB