Analysis

  • max time kernel
    144s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-05-2024 19:43

General

  • Target

    1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2.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.

  • Creates new service(s) 2 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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2.exe
    "C:\Users\Admin\AppData\Local\Temp\1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2356
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wvcnkesk\
      2⤵
        PID:1968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tjfuphfn.exe" C:\Windows\SysWOW64\wvcnkesk\
        2⤵
          PID:2336
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wvcnkesk binPath= "C:\Windows\SysWOW64\wvcnkesk\tjfuphfn.exe /d\"C:\Users\Admin\AppData\Local\Temp\1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2840
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wvcnkesk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wvcnkesk
          2⤵
          • Launches sc.exe
          PID:640
        • 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:1004
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2356 -s 1040
          2⤵
          • Program crash
          PID:4088
      • C:\Windows\SysWOW64\wvcnkesk\tjfuphfn.exe
        C:\Windows\SysWOW64\wvcnkesk\tjfuphfn.exe /d"C:\Users\Admin\AppData\Local\Temp\1dc79692db8709e88fee042c5555f8432dc4638442887d8150b8b7c67f5f3eb2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2428
        • 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:1804
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2428 -s 440
          2⤵
          • Program crash
          PID:2000
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2428 -ip 2428
        1⤵
          PID:2644
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2356 -ip 2356
          1⤵
            PID:2052

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            11.8MB

            MD5

            d6f579d98e2906405dd2020c7102172d

            SHA1

            0e248bf8aca461a7e5289f913523f4c789ea2271

            SHA256

            b361afad526bb3606f2ffdcb678b9b7327d6da86a649d5512eb4053e986f5e78

            SHA512

            8337556f54d8e44ad987260b47707d31442fe52ea075f60f43b856680c459ec3d7870051e9dffc2c10a09f3c60ede0cf8b56b41158be1b1ad35ac5c9e8694022

          • memory/1804-35-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-22-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1804-19-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1804-43-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-8-0x0000000000A00000-0x0000000000A15000-memory.dmp

            Filesize

            84KB

          • memory/1804-42-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-23-0x0000000002950000-0x0000000002956000-memory.dmp

            Filesize

            24KB

          • memory/1804-26-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-29-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-16-0x0000000000A00000-0x0000000000A15000-memory.dmp

            Filesize

            84KB

          • memory/1804-17-0x0000000000A00000-0x0000000000A15000-memory.dmp

            Filesize

            84KB

          • memory/1804-31-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-50-0x0000000007640000-0x0000000007A4B000-memory.dmp

            Filesize

            4.0MB

          • memory/1804-54-0x0000000007B90000-0x0000000007B97000-memory.dmp

            Filesize

            28KB

          • memory/1804-49-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

            Filesize

            20KB

          • memory/1804-46-0x0000000002BF0000-0x0000000002BF5000-memory.dmp

            Filesize

            20KB

          • memory/1804-45-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-44-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-53-0x0000000007640000-0x0000000007A4B000-memory.dmp

            Filesize

            4.0MB

          • memory/1804-30-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-40-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-41-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-39-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-38-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-37-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-36-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-32-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-34-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/1804-33-0x0000000002960000-0x0000000002970000-memory.dmp

            Filesize

            64KB

          • memory/2356-2-0x0000000001AA0000-0x0000000001AB3000-memory.dmp

            Filesize

            76KB

          • memory/2356-3-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2356-13-0x0000000000400000-0x0000000001A1B000-memory.dmp

            Filesize

            22.1MB

          • memory/2356-14-0x0000000001AA0000-0x0000000001AB3000-memory.dmp

            Filesize

            76KB

          • memory/2356-15-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/2356-1-0x0000000001BB0000-0x0000000001CB0000-memory.dmp

            Filesize

            1024KB

          • memory/2428-10-0x0000000000400000-0x0000000001A1B000-memory.dmp

            Filesize

            22.1MB

          • memory/2428-11-0x0000000000400000-0x0000000001A1B000-memory.dmp

            Filesize

            22.1MB