Analysis

  • max time kernel
    173s
  • max time network
    184s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe

  • Size

    329KB

  • MD5

    c5acf32a68fc55104b5dafc61245bab4

  • SHA1

    8a1d49efbb20a987cd87d227c4c4016a36c76afb

  • SHA256

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb

  • SHA512

    8bc262803139c0420b71ffea63e772124446349d913bb194646c22f0d4dca0cd04d3a3108032c2f31618f482e86fbfa0aa4de63d7c53fcd03dcc438763970808

  • SSDEEP

    3072:y9xdm7sMhs6Y28qryW6A4bdZc4nJcJW+XkmwVWf4rEVjSHwZROr4bpLkC:yIths6Y28ehy5nJcU6QrEVjWlr4a

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe
    "C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3880
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\seyemtim\
      2⤵
        PID:1080
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zxmundyu.exe" C:\Windows\SysWOW64\seyemtim\
        2⤵
          PID:2924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create seyemtim binPath= "C:\Windows\SysWOW64\seyemtim\zxmundyu.exe /d\"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description seyemtim "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start seyemtim
          2⤵
          • Launches sc.exe
          PID:2304
        • 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:2840
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3880 -s 572
          2⤵
          • Program crash
          PID:3540
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3880 -ip 3880
        1⤵
          PID:3240
        • C:\Windows\SysWOW64\seyemtim\zxmundyu.exe
          C:\Windows\SysWOW64\seyemtim\zxmundyu.exe /d"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4512
          • 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:4692
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4512 -s 524
            2⤵
            • Program crash
            PID:3884
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4512 -ip 4512
          1⤵
            PID:2936

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  11.3MB

                  MD5

                  ff82706453b2388da3b07de589b41136

                  SHA1

                  0b96e8b8dd5b63297d88eb997af086fcf249086c

                  SHA256

                  2c3033c6bd2af63d8d68a147bbdb1ccb973c301acd9ecb4accc95027419b7f77

                  SHA512

                  b5416fe9ed40808150d9ed6236ccddc49639e54016f0d937637cc9fef3c858c402c2bb1c10049bfe396bdaa41940de9600a6fca0242e8cd5ef1ee89f1e396139

                • C:\Windows\SysWOW64\seyemtim\zxmundyu.exe

                  Filesize

                  11.3MB

                  MD5

                  ff82706453b2388da3b07de589b41136

                  SHA1

                  0b96e8b8dd5b63297d88eb997af086fcf249086c

                  SHA256

                  2c3033c6bd2af63d8d68a147bbdb1ccb973c301acd9ecb4accc95027419b7f77

                  SHA512

                  b5416fe9ed40808150d9ed6236ccddc49639e54016f0d937637cc9fef3c858c402c2bb1c10049bfe396bdaa41940de9600a6fca0242e8cd5ef1ee89f1e396139

                • memory/3880-5-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/3880-3-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/3880-8-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/3880-2-0x0000000000670000-0x0000000000683000-memory.dmp

                  Filesize

                  76KB

                • memory/3880-10-0x00000000006D0000-0x00000000007D0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3880-12-0x0000000000670000-0x0000000000683000-memory.dmp

                  Filesize

                  76KB

                • memory/3880-1-0x00000000006D0000-0x00000000007D0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4512-22-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/4512-14-0x00000000007C0000-0x00000000008C0000-memory.dmp

                  Filesize

                  1024KB

                • memory/4512-15-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/4512-16-0x0000000000400000-0x0000000000507000-memory.dmp

                  Filesize

                  1.0MB

                • memory/4692-36-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-42-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-20-0x0000000000480000-0x0000000000495000-memory.dmp

                  Filesize

                  84KB

                • memory/4692-23-0x0000000000480000-0x0000000000495000-memory.dmp

                  Filesize

                  84KB

                • memory/4692-25-0x0000000002000000-0x000000000220F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4692-28-0x0000000002000000-0x000000000220F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4692-29-0x0000000002350000-0x0000000002356000-memory.dmp

                  Filesize

                  24KB

                • memory/4692-32-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-35-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-17-0x0000000000480000-0x0000000000495000-memory.dmp

                  Filesize

                  84KB

                • memory/4692-37-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-38-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-43-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-44-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-45-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-21-0x0000000000480000-0x0000000000495000-memory.dmp

                  Filesize

                  84KB

                • memory/4692-41-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-40-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-39-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-47-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-46-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-49-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-48-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-50-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-51-0x0000000002360000-0x0000000002370000-memory.dmp

                  Filesize

                  64KB

                • memory/4692-55-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/4692-56-0x0000000007040000-0x000000000744B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4692-52-0x00000000025F0000-0x00000000025F5000-memory.dmp

                  Filesize

                  20KB

                • memory/4692-59-0x0000000007040000-0x000000000744B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4692-60-0x0000000007590000-0x0000000007597000-memory.dmp

                  Filesize

                  28KB

                • memory/4692-64-0x0000000000480000-0x0000000000495000-memory.dmp

                  Filesize

                  84KB