Analysis

  • max time kernel
    150s
  • 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 13:36

General

  • Target

    0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe

  • Size

    258KB

  • MD5

    c604511f8c117ca36984e8aa66ac0a71

  • SHA1

    7ce156eb70e31fbdf62c3d7e60e6eefff7b21c7d

  • SHA256

    0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4

  • SHA512

    031ffc652bd29c52b8ea733fa6a9e37c9908798d4121d0452c2e0207d17086f43451c273b686ef4c086fc859fe6cf906e403bd09008b11cfc2498ec338ae3441

  • SSDEEP

    3072:xkh5eI/cSz90u2DEJClClQoyLwETsrw/eEOobr6e7AXa2jyQfEBw0coqY7IQPJUD:xkh+BEQ0SBTRVOobrPXYES0cWEQRER

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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe
    "C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2568
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\adxlmins\
      2⤵
        PID:440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnjytljr.exe" C:\Windows\SysWOW64\adxlmins\
        2⤵
          PID:3940
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create adxlmins binPath= "C:\Windows\SysWOW64\adxlmins\xnjytljr.exe /d\"C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description adxlmins "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start adxlmins
          2⤵
          • Launches sc.exe
          PID:1932
        • 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:4740
      • C:\Windows\SysWOW64\adxlmins\xnjytljr.exe
        C:\Windows\SysWOW64\adxlmins\xnjytljr.exe /d"C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4636
        • 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:5024

      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

      1
      T1562

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      1
      T1112

      Discovery

      Query Registry

      1
      T1012

      System Information Discovery

      2
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        10.7MB

        MD5

        37b9d815ea0b3d40149b4db820e4f000

        SHA1

        0eb2497ce2ad0ac3ccd6d318ef6cb66cd9c542da

        SHA256

        81ff35a737ef38a9157fed074476bce90ff2d15c986ea6b0839de40d36976cc3

        SHA512

        cc81ac2789dba59e28ba07cdbc7168ab2ccad78572c7131e847d4bcf0cfb7dea084a1a2c7a41eed75c3075480dff78709c193b656c40bc6f6dc2f166b999f362

      • memory/2568-16-0x0000000000400000-0x0000000000446000-memory.dmp
        Filesize

        280KB

      • memory/2568-2-0x0000000002180000-0x0000000002193000-memory.dmp
        Filesize

        76KB

      • memory/2568-3-0x0000000000400000-0x0000000000446000-memory.dmp
        Filesize

        280KB

      • memory/2568-1-0x00000000005A0000-0x00000000006A0000-memory.dmp
        Filesize

        1024KB

      • memory/4636-8-0x0000000000740000-0x0000000000840000-memory.dmp
        Filesize

        1024KB

      • memory/4636-9-0x0000000000D10000-0x0000000000D23000-memory.dmp
        Filesize

        76KB

      • memory/4636-11-0x0000000000400000-0x0000000000446000-memory.dmp
        Filesize

        280KB

      • memory/4636-13-0x0000000000400000-0x0000000000446000-memory.dmp
        Filesize

        280KB

      • memory/5024-33-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-42-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-17-0x0000000000280000-0x0000000000295000-memory.dmp
        Filesize

        84KB

      • memory/5024-18-0x0000000000280000-0x0000000000295000-memory.dmp
        Filesize

        84KB

      • memory/5024-20-0x0000000000280000-0x0000000000295000-memory.dmp
        Filesize

        84KB

      • memory/5024-21-0x0000000002000000-0x000000000220F000-memory.dmp
        Filesize

        2.1MB

      • memory/5024-24-0x0000000002000000-0x000000000220F000-memory.dmp
        Filesize

        2.1MB

      • memory/5024-25-0x00000000017F0000-0x00000000017F6000-memory.dmp
        Filesize

        24KB

      • memory/5024-28-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-31-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-32-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-10-0x0000000000280000-0x0000000000295000-memory.dmp
        Filesize

        84KB

      • memory/5024-36-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-39-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-38-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-15-0x0000000000280000-0x0000000000295000-memory.dmp
        Filesize

        84KB

      • memory/5024-45-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-44-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-46-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-48-0x00000000029C0000-0x00000000029C5000-memory.dmp
        Filesize

        20KB

      • memory/5024-47-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-52-0x0000000007800000-0x0000000007C0B000-memory.dmp
        Filesize

        4.0MB

      • memory/5024-51-0x00000000029C0000-0x00000000029C5000-memory.dmp
        Filesize

        20KB

      • memory/5024-43-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-41-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-55-0x0000000007800000-0x0000000007C0B000-memory.dmp
        Filesize

        4.0MB

      • memory/5024-40-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-56-0x0000000002DD0000-0x0000000002DD7000-memory.dmp
        Filesize

        28KB

      • memory/5024-37-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-34-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB

      • memory/5024-35-0x0000000002350000-0x0000000002360000-memory.dmp
        Filesize

        64KB