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 13:34

General

  • Target

    8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe

  • Size

    331KB

  • MD5

    3424a650d03640ec89fbb499d6674480

  • SHA1

    1ea36d7a77ec67039e67f944280dfdcdf1582991

  • SHA256

    8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1

  • SHA512

    5f8bed9cf3da89216af3b87d580535a29a67a617b8bee82e448ae2d02f4cf38975058d2a0d02cf3d48411745a8fc19d09eb5936b66d7be1c75d31087142e2411

  • SSDEEP

    6144:/K6gQvvYlQo7wU9TZlSmHgafhoeyz5xYmX/M:C5QvvYlhbCmHgGhoeYxYmE

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe
    "C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2728
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdogpumv\
      2⤵
        PID:1788
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjmhgaau.exe" C:\Windows\SysWOW64\hdogpumv\
        2⤵
          PID:2600
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hdogpumv binPath= "C:\Windows\SysWOW64\hdogpumv\cjmhgaau.exe /d\"C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hdogpumv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3288
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hdogpumv
          2⤵
          • Launches sc.exe
          PID:4756
        • 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:2168
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2728 -s 1036
          2⤵
          • Program crash
          PID:4440
      • C:\Windows\SysWOW64\hdogpumv\cjmhgaau.exe
        C:\Windows\SysWOW64\hdogpumv\cjmhgaau.exe /d"C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4516
        • 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:2340
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4516 -s 512
          2⤵
          • Program crash
          PID:2972
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4516 -ip 4516
        1⤵
          PID:1412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 500 -p 2728 -ip 2728
          1⤵
            PID:624

          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\cjmhgaau.exe
            Filesize

            12.3MB

            MD5

            b6677c41ceaf27e601c1dd9c26199098

            SHA1

            223f63774bafdf2a3f0034fca9b488eced82ac73

            SHA256

            f94922b3de81ff88dcc3376331f50f098fc7606ad6019ff66bf23550fd8472ed

            SHA512

            0356ce562a2c3122c67ac8dd06e92305dd1dbf8bfb20f4a51a7cc6f0746b43c71dd643918c77b5e1b7a55589bd6bc5bf8fffa0f239913548bc100d98008c41c1

          • memory/2340-41-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-55-0x0000000006F80000-0x000000000738B000-memory.dmp
            Filesize

            4.0MB

          • memory/2340-56-0x00000000017F0000-0x00000000017F7000-memory.dmp
            Filesize

            28KB

          • memory/2340-31-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-52-0x0000000006F80000-0x000000000738B000-memory.dmp
            Filesize

            4.0MB

          • memory/2340-51-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/2340-8-0x0000000000180000-0x0000000000195000-memory.dmp
            Filesize

            84KB

          • memory/2340-14-0x0000000000180000-0x0000000000195000-memory.dmp
            Filesize

            84KB

          • memory/2340-32-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-17-0x0000000000180000-0x0000000000195000-memory.dmp
            Filesize

            84KB

          • memory/2340-18-0x0000000000180000-0x0000000000195000-memory.dmp
            Filesize

            84KB

          • memory/2340-20-0x0000000000180000-0x0000000000195000-memory.dmp
            Filesize

            84KB

          • memory/2340-21-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/2340-24-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/2340-25-0x0000000001740000-0x0000000001746000-memory.dmp
            Filesize

            24KB

          • memory/2340-28-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-33-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-34-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-48-0x00000000017E0000-0x00000000017E5000-memory.dmp
            Filesize

            20KB

          • memory/2340-47-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-40-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-35-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-37-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-38-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-39-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-36-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-46-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-43-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-42-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-44-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2340-45-0x0000000001750000-0x0000000001760000-memory.dmp
            Filesize

            64KB

          • memory/2728-2-0x0000000000570000-0x0000000000583000-memory.dmp
            Filesize

            76KB

          • memory/2728-4-0x0000000000400000-0x000000000045C000-memory.dmp
            Filesize

            368KB

          • memory/2728-16-0x0000000000400000-0x000000000045C000-memory.dmp
            Filesize

            368KB

          • memory/2728-1-0x0000000000630000-0x0000000000730000-memory.dmp
            Filesize

            1024KB

          • memory/4516-9-0x00000000005C0000-0x00000000006C0000-memory.dmp
            Filesize

            1024KB

          • memory/4516-12-0x0000000000400000-0x000000000045C000-memory.dmp
            Filesize

            368KB

          • memory/4516-10-0x00000000004E0000-0x00000000004F3000-memory.dmp
            Filesize

            76KB