Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/11/2023, 09:59

General

  • Target

    file.exe

  • Size

    259KB

  • MD5

    2a1390eb5563d733832c473f1109e872

  • SHA1

    44429ef9a32e8ce931eeb541a3863ed6f9727ccb

  • SHA256

    d15e72bad1966732249eb9f860d6dcaad2db09541ad67de8eee39febc706aa31

  • SHA512

    5ac6fcbd42942d7656c651fab7432a0942570afc5068e96e6a7c41a0b504059605052eab306193f686199c1bf739a2af0982bf480b995e55b9e116abd6c8b4e2

  • SSDEEP

    3072:GVXQ37fLJYJqgU5AoFCE+MBVaXAlXxDAVh5lRIxEnU:OQLfL2k7xCE+U6exDAfRq

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.

  • 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 4 IoCs
  • Modifies data under HKEY_USERS 6 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:4764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rvvraxnl\
      2⤵
        PID:3408
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mpmfwysi.exe" C:\Windows\SysWOW64\rvvraxnl\
        2⤵
          PID:2356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rvvraxnl binPath= "C:\Windows\SysWOW64\rvvraxnl\mpmfwysi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2684
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rvvraxnl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3576
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rvvraxnl
          2⤵
          • Launches sc.exe
          PID:2556
        • 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:5116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4764 -s 776
          2⤵
          • Program crash
          PID:2452
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4764 -s 660
          2⤵
          • Program crash
          PID:4384
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4764 -ip 4764
        1⤵
          PID:1708
        • C:\Windows\SysWOW64\rvvraxnl\mpmfwysi.exe
          C:\Windows\SysWOW64\rvvraxnl\mpmfwysi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1292
          • 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:1612
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1292 -s 520
            2⤵
            • Program crash
            PID:4300
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1292 -s 564
            2⤵
            • Program crash
            PID:2484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 4764 -ip 4764
          1⤵
            PID:3924
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 1292 -ip 1292
            1⤵
              PID:3840
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 1292 -ip 1292
              1⤵
                PID:1396

              Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

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

                      Filesize

                      14.5MB

                      MD5

                      b8d8124e9fc64888dd22475b0b49300b

                      SHA1

                      174af310acb715a4ac856df06cb4ea5a594060ab

                      SHA256

                      8d81a46e39b58fb3f83b0185faa42c9ec1ec3ed4b90de8268a7dc46a02af2efd

                      SHA512

                      54f252da1814c9536b4a72a8a28e5c393ae2e9350585cf7e37de4b6bf4f5276bb5057ba7638e9a8ae37050a464d09e2e4df2a17b54ccc5c219fe18fc9a20821c

                    • C:\Windows\SysWOW64\rvvraxnl\mpmfwysi.exe

                      Filesize

                      14.5MB

                      MD5

                      b8d8124e9fc64888dd22475b0b49300b

                      SHA1

                      174af310acb715a4ac856df06cb4ea5a594060ab

                      SHA256

                      8d81a46e39b58fb3f83b0185faa42c9ec1ec3ed4b90de8268a7dc46a02af2efd

                      SHA512

                      54f252da1814c9536b4a72a8a28e5c393ae2e9350585cf7e37de4b6bf4f5276bb5057ba7638e9a8ae37050a464d09e2e4df2a17b54ccc5c219fe18fc9a20821c

                    • memory/1292-18-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/1292-12-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/1292-11-0x00000000006A0000-0x00000000007A0000-memory.dmp

                      Filesize

                      1024KB

                    • memory/1612-33-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-35-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-56-0x0000000002BF0000-0x0000000002BF7000-memory.dmp

                      Filesize

                      28KB

                    • memory/1612-55-0x0000000007600000-0x0000000007A0B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/1612-13-0x0000000000A30000-0x0000000000A45000-memory.dmp

                      Filesize

                      84KB

                    • memory/1612-16-0x0000000000A30000-0x0000000000A45000-memory.dmp

                      Filesize

                      84KB

                    • memory/1612-17-0x0000000000A30000-0x0000000000A45000-memory.dmp

                      Filesize

                      84KB

                    • memory/1612-52-0x0000000007600000-0x0000000007A0B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/1612-20-0x0000000000A30000-0x0000000000A45000-memory.dmp

                      Filesize

                      84KB

                    • memory/1612-21-0x0000000002600000-0x000000000280F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/1612-24-0x0000000002600000-0x000000000280F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/1612-25-0x0000000000C20000-0x0000000000C26000-memory.dmp

                      Filesize

                      24KB

                    • memory/1612-28-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-31-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-32-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-51-0x0000000002BE0000-0x0000000002BE5000-memory.dmp

                      Filesize

                      20KB

                    • memory/1612-34-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-48-0x0000000002BE0000-0x0000000002BE5000-memory.dmp

                      Filesize

                      20KB

                    • memory/1612-36-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-37-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-38-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-39-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-40-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-41-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-42-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-43-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-44-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-45-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-46-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/1612-47-0x0000000002910000-0x0000000002920000-memory.dmp

                      Filesize

                      64KB

                    • memory/4764-10-0x0000000002240000-0x0000000002253000-memory.dmp

                      Filesize

                      76KB

                    • memory/4764-1-0x0000000000680000-0x0000000000780000-memory.dmp

                      Filesize

                      1024KB

                    • memory/4764-2-0x0000000002240000-0x0000000002253000-memory.dmp

                      Filesize

                      76KB

                    • memory/4764-3-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/4764-6-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB