Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/09/2023, 14:59

General

  • Target

    9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052_JC.exe

  • Size

    254KB

  • MD5

    8711b0f84531c6aa872bd7b9cbafe866

  • SHA1

    71e860db1fcd61be5c5034c1a6e7f60db822c32b

  • SHA256

    9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052

  • SHA512

    236df6134cb8ef922beced452948bf736bd8a3481ab084b76072570357b971c779ef809497293775cb75f98550af52510e87108b161c695df35bac917487e6c3

  • SSDEEP

    3072:geTmM10cMLLQ6vbxXhBjOlUK1Pm2jWyhG4OK8ZzIMxfezD80:MMecMQ6vphBq1NrjWyhrAz/xW

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\9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052_JC.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3624
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dwyomniq\
      2⤵
        PID:2912
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fzecxaxz.exe" C:\Windows\SysWOW64\dwyomniq\
        2⤵
          PID:3728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dwyomniq binPath= "C:\Windows\SysWOW64\dwyomniq\fzecxaxz.exe /d\"C:\Users\Admin\AppData\Local\Temp\9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052_JC.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dwyomniq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dwyomniq
          2⤵
          • Launches sc.exe
          PID:4740
        • 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:4184
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3624 -s 1152
          2⤵
          • Program crash
          PID:3956
      • C:\Windows\SysWOW64\dwyomniq\fzecxaxz.exe
        C:\Windows\SysWOW64\dwyomniq\fzecxaxz.exe /d"C:\Users\Admin\AppData\Local\Temp\9c9b7260556caeabcb0503f3b105b059b1d7ad78c7efc12d15ba506e7e2c2052_JC.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3992
        • 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:3960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3992 -s 516
          2⤵
          • Program crash
          PID:1424
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3624 -ip 3624
        1⤵
          PID:1384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3992 -ip 3992
          1⤵
            PID:3608

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            12.8MB

            MD5

            709abe916fb0a40b873d9808981f74e7

            SHA1

            d195e71dfab5880fadeaabc6a35ae0c934ac22ce

            SHA256

            8f89ccb9f24435685d53a2bbbe8234b5c05513c5bf45c98cd761a850bce279dd

            SHA512

            03efdf32c1d4f75241449be1f7dc9cb9b599583ad95c7580a055cd58e496cf648fc88017532a848e5aeb5a8f261f8779e66accccce36ae8452c4d6735ca478e2

          • C:\Windows\SysWOW64\dwyomniq\fzecxaxz.exe

            Filesize

            12.8MB

            MD5

            709abe916fb0a40b873d9808981f74e7

            SHA1

            d195e71dfab5880fadeaabc6a35ae0c934ac22ce

            SHA256

            8f89ccb9f24435685d53a2bbbe8234b5c05513c5bf45c98cd761a850bce279dd

            SHA512

            03efdf32c1d4f75241449be1f7dc9cb9b599583ad95c7580a055cd58e496cf648fc88017532a848e5aeb5a8f261f8779e66accccce36ae8452c4d6735ca478e2

          • memory/3624-17-0x0000000000400000-0x000000000070E000-memory.dmp

            Filesize

            3.1MB

          • memory/3624-2-0x0000000000870000-0x0000000000883000-memory.dmp

            Filesize

            76KB

          • memory/3624-4-0x0000000000400000-0x000000000070E000-memory.dmp

            Filesize

            3.1MB

          • memory/3624-1-0x00000000008C0000-0x00000000009C0000-memory.dmp

            Filesize

            1024KB

          • memory/3624-9-0x00000000008C0000-0x00000000009C0000-memory.dmp

            Filesize

            1024KB

          • memory/3960-42-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-36-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-14-0x0000000000D60000-0x0000000000D75000-memory.dmp

            Filesize

            84KB

          • memory/3960-57-0x00000000031D0000-0x00000000031D7000-memory.dmp

            Filesize

            28KB

          • memory/3960-56-0x0000000007B40000-0x0000000007F4B000-memory.dmp

            Filesize

            4.0MB

          • memory/3960-10-0x0000000000D60000-0x0000000000D75000-memory.dmp

            Filesize

            84KB

          • memory/3960-18-0x0000000000D60000-0x0000000000D75000-memory.dmp

            Filesize

            84KB

          • memory/3960-19-0x0000000000D60000-0x0000000000D75000-memory.dmp

            Filesize

            84KB

          • memory/3960-21-0x0000000000D60000-0x0000000000D75000-memory.dmp

            Filesize

            84KB

          • memory/3960-22-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3960-25-0x0000000002C00000-0x0000000002E0F000-memory.dmp

            Filesize

            2.1MB

          • memory/3960-26-0x0000000002310000-0x0000000002316000-memory.dmp

            Filesize

            24KB

          • memory/3960-29-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-32-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-33-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-34-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-35-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-53-0x0000000007B40000-0x0000000007F4B000-memory.dmp

            Filesize

            4.0MB

          • memory/3960-37-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-38-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-40-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-39-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-41-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-52-0x00000000023F0000-0x00000000023F5000-memory.dmp

            Filesize

            20KB

          • memory/3960-43-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-44-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-45-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-46-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-47-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-48-0x0000000002320000-0x0000000002330000-memory.dmp

            Filesize

            64KB

          • memory/3960-49-0x00000000023F0000-0x00000000023F5000-memory.dmp

            Filesize

            20KB

          • memory/3992-8-0x00000000008B0000-0x00000000009B0000-memory.dmp

            Filesize

            1024KB

          • memory/3992-12-0x0000000000400000-0x000000000070E000-memory.dmp

            Filesize

            3.1MB

          • memory/3992-16-0x0000000000870000-0x0000000000883000-memory.dmp

            Filesize

            76KB

          • memory/3992-15-0x0000000000400000-0x000000000070E000-memory.dmp

            Filesize

            3.1MB