Analysis

  • max time kernel
    178s
  • max time network
    187s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/10/2023, 07:52

General

  • Target

    file.exe

  • Size

    217KB

  • MD5

    d463534b0954694b60167a0cb04efaeb

  • SHA1

    a87d785486046ae80d796207f917e8f56d13a4b5

  • SHA256

    592d40863ff1e617388d42e0886b1a3280602fc6e25217d74436d232a32041c1

  • SHA512

    564b84a451b449c6499cbe8de41dacaf3f5bf9e949d4fde52d1b12d03f19b74bda0bf33502a6a8e6e2451c4fbdd97e7bc52d5b0f096e002310e8b6785944f755

  • SSDEEP

    3072:oHXkUCqSTZLMGAfp3C1rlodZNE6nZ1Vb96fQd0Dha5mT9:qkUCDLyfJoGdZ26Z1V5JKhNT

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 1 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.

  • 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3864
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xbzhaanl\
      2⤵
        PID:2620
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ahorgunx.exe" C:\Windows\SysWOW64\xbzhaanl\
        2⤵
          PID:3108
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xbzhaanl binPath= "C:\Windows\SysWOW64\xbzhaanl\ahorgunx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2736
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xbzhaanl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xbzhaanl
          2⤵
          • Launches sc.exe
          PID:4976
        • 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:744
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3864 -s 1220
          2⤵
          • Program crash
          PID:4480
      • C:\Windows\SysWOW64\xbzhaanl\ahorgunx.exe
        C:\Windows\SysWOW64\xbzhaanl\ahorgunx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3888
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:980
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3888 -s 528
          2⤵
          • Program crash
          PID:456
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3864 -ip 3864
        1⤵
          PID:1320
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 3888 -ip 3888
          1⤵
            PID:1392

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\ahorgunx.exe

            Filesize

            11.5MB

            MD5

            77e0b17c3ec2cfcee020d9a13ba74af7

            SHA1

            05d6b97b6632578a335f87073b009d4f51fec7e1

            SHA256

            24e6bd7ec4a7d3a0829c87cbd552732317e14052218af395fd195f4232b6702e

            SHA512

            ec68c7ca83861df66f4707c763612496ca5e0a87a788d467c5edabb00a4fef8046bc7e4a53d8e7b9a3cd1f70dd18dc541469bb6a5d617493504a2fce089d9662

          • C:\Windows\SysWOW64\xbzhaanl\ahorgunx.exe

            Filesize

            11.5MB

            MD5

            77e0b17c3ec2cfcee020d9a13ba74af7

            SHA1

            05d6b97b6632578a335f87073b009d4f51fec7e1

            SHA256

            24e6bd7ec4a7d3a0829c87cbd552732317e14052218af395fd195f4232b6702e

            SHA512

            ec68c7ca83861df66f4707c763612496ca5e0a87a788d467c5edabb00a4fef8046bc7e4a53d8e7b9a3cd1f70dd18dc541469bb6a5d617493504a2fce089d9662

          • memory/980-47-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-50-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-62-0x0000000007580000-0x000000000798B000-memory.dmp

            Filesize

            4.0MB

          • memory/980-63-0x0000000001DE0000-0x0000000001DE7000-memory.dmp

            Filesize

            28KB

          • memory/980-59-0x0000000007580000-0x000000000798B000-memory.dmp

            Filesize

            4.0MB

          • memory/980-58-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/980-55-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/980-54-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-53-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-16-0x0000000000780000-0x0000000000795000-memory.dmp

            Filesize

            84KB

          • memory/980-19-0x0000000000780000-0x0000000000795000-memory.dmp

            Filesize

            84KB

          • memory/980-52-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-22-0x0000000000780000-0x0000000000795000-memory.dmp

            Filesize

            84KB

          • memory/980-23-0x0000000000780000-0x0000000000795000-memory.dmp

            Filesize

            84KB

          • memory/980-27-0x0000000000780000-0x0000000000795000-memory.dmp

            Filesize

            84KB

          • memory/980-28-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/980-31-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/980-32-0x0000000001D30000-0x0000000001D36000-memory.dmp

            Filesize

            24KB

          • memory/980-35-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-38-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-51-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-40-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-39-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-42-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-44-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-45-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-43-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-46-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-41-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-48-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/980-49-0x0000000001D40000-0x0000000001D50000-memory.dmp

            Filesize

            64KB

          • memory/3864-1-0x0000000000850000-0x0000000000950000-memory.dmp

            Filesize

            1024KB

          • memory/3864-3-0x0000000000400000-0x00000000005AE000-memory.dmp

            Filesize

            1.7MB

          • memory/3864-11-0x0000000000400000-0x00000000005AE000-memory.dmp

            Filesize

            1.7MB

          • memory/3864-10-0x00000000022F0000-0x0000000002303000-memory.dmp

            Filesize

            76KB

          • memory/3864-9-0x0000000000850000-0x0000000000950000-memory.dmp

            Filesize

            1024KB

          • memory/3864-2-0x00000000022F0000-0x0000000002303000-memory.dmp

            Filesize

            76KB

          • memory/3864-6-0x0000000000400000-0x00000000005AE000-memory.dmp

            Filesize

            1.7MB

          • memory/3888-21-0x0000000000400000-0x00000000005AE000-memory.dmp

            Filesize

            1.7MB

          • memory/3888-15-0x0000000000400000-0x00000000005AE000-memory.dmp

            Filesize

            1.7MB

          • memory/3888-14-0x0000000000940000-0x0000000000A40000-memory.dmp

            Filesize

            1024KB