Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    04-05-2024 13:20

General

  • Target

    35f519000ad078d242c0bce097c59b31.exe

  • Size

    326KB

  • MD5

    35f519000ad078d242c0bce097c59b31

  • SHA1

    41a3c859c36a4240a51e6ce17ab269e8d2728eb0

  • SHA256

    1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2

  • SHA512

    260f2efe4757c518f96269ba3a3fd5b5c603fa6a52d9c0d976222158609911004ce48df4e75298c11de67ea29d91969f217986e4c0f1b83bb2f5d2a43a772997

  • SSDEEP

    3072:KLTZ5XJKQsp6NU4tqwCyc40r+oeHpmCR54kDSWegJSVE+Er20L4fdoiKuIov5QId:KbCt44p40rqHPbDb86r2LiNovrb/a

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) 2 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\35f519000ad078d242c0bce097c59b31.exe
    "C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mkhznnrj\
      2⤵
        PID:2264
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xrrjmwam.exe" C:\Windows\SysWOW64\mkhznnrj\
        2⤵
          PID:2396
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mkhznnrj binPath= "C:\Windows\SysWOW64\mkhznnrj\xrrjmwam.exe /d\"C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2724
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mkhznnrj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2024
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mkhznnrj
          2⤵
          • Launches sc.exe
          PID:2716
        • 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:2820
      • C:\Windows\SysWOW64\mkhznnrj\xrrjmwam.exe
        C:\Windows\SysWOW64\mkhznnrj\xrrjmwam.exe /d"C:\Users\Admin\AppData\Local\Temp\35f519000ad078d242c0bce097c59b31.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2756
        • 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:2100

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Execution

      System Services

      1
      T1569

      Service Execution

      1
      T1569.002

      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\xrrjmwam.exe
        Filesize

        12.6MB

        MD5

        55fc959f9eb26ff3eb57921ecdf773f1

        SHA1

        b8d59e0b6515392d808882101ab47c2e8bbb9185

        SHA256

        4ecf297ecf8a804f14b7c50ec30ae33040788643fe4de1461c42f25966c4c5e1

        SHA512

        4541c5ff414b2d5e83709492016188018d7cc2d778d1c3dfc20f7176419112044851da9fce835b13055de16a471e7973c6a1f08bfeca1637af28d2443ee82cff

      • memory/2040-15-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2040-4-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2040-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2040-2-0x0000000001BB0000-0x0000000001CB0000-memory.dmp
        Filesize

        1024KB

      • memory/2040-14-0x0000000000400000-0x0000000001A1B000-memory.dmp
        Filesize

        22.1MB

      • memory/2100-41-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-38-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-8-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2100-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2100-16-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2100-17-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2100-23-0x0000000000150000-0x0000000000156000-memory.dmp
        Filesize

        24KB

      • memory/2100-26-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-22-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/2100-19-0x00000000019A0000-0x0000000001BAF000-memory.dmp
        Filesize

        2.1MB

      • memory/2100-43-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-42-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-11-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2100-40-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-39-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-45-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-37-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-36-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-35-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-34-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-33-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-32-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-31-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-30-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-29-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-44-0x00000000001E0000-0x00000000001F0000-memory.dmp
        Filesize

        64KB

      • memory/2100-54-0x0000000000500000-0x0000000000507000-memory.dmp
        Filesize

        28KB

      • memory/2100-53-0x0000000005450000-0x000000000585B000-memory.dmp
        Filesize

        4.0MB

      • memory/2100-50-0x0000000005450000-0x000000000585B000-memory.dmp
        Filesize

        4.0MB

      • memory/2100-49-0x00000000004F0000-0x00000000004F5000-memory.dmp
        Filesize

        20KB

      • memory/2100-46-0x00000000004F0000-0x00000000004F5000-memory.dmp
        Filesize

        20KB

      • memory/2756-13-0x0000000000400000-0x0000000001A1B000-memory.dmp
        Filesize

        22.1MB