Analysis

  • max time kernel
    146s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/11/2023, 10:41

General

  • Target

    b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be.exe

  • Size

    220KB

  • MD5

    dd09a9973d27942da1be86ba0ec18e04

  • SHA1

    55c89c419b5431003036944bbea6be5a8d155728

  • SHA256

    b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be

  • SHA512

    debf5b4e40bee2943689d0475606cdc9284e6a086929f607417a98e0b2cedc415a40ee39b9af8e6ff2c51dab28394acf772def29be0ffccc506c4190780e6469

  • SSDEEP

    3072:DRMf9iL/LPi/9Dp+jt1Rj08y+pHScyBO0RPhLlVP:D2fcLG/BS1R2aQfhT

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be.exe
    "C:\Users\Admin\AppData\Local\Temp\b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oballjsi\
      2⤵
        PID:5040
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pjjbeose.exe" C:\Windows\SysWOW64\oballjsi\
        2⤵
          PID:2216
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create oballjsi binPath= "C:\Windows\SysWOW64\oballjsi\pjjbeose.exe /d\"C:\Users\Admin\AppData\Local\Temp\b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1240
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description oballjsi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3840
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start oballjsi
          2⤵
          • Launches sc.exe
          PID:3584
        • 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:4480
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1236 -s 656
          2⤵
          • Program crash
          PID:4764
      • C:\Windows\SysWOW64\oballjsi\pjjbeose.exe
        C:\Windows\SysWOW64\oballjsi\pjjbeose.exe /d"C:\Users\Admin\AppData\Local\Temp\b1dd4a875820cc75d790f72e06bd0aa33d64ac2866369d9cf0973ae0043290be.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1868
        • 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:4860
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1868 -s 512
          2⤵
          • Program crash
          PID:3256
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 1236 -ip 1236
        1⤵
          PID:4788
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 1868 -ip 1868
          1⤵
            PID:2140
          • C:\Windows\system32\svchost.exe
            C:\Windows\system32\svchost.exe -k LocalServiceAndNoImpersonation -p -s SSDPSRV
            1⤵
              PID:5040

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

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

                    Filesize

                    10.2MB

                    MD5

                    9d3099dbd494a2b5ea6e547addb1b2d4

                    SHA1

                    70e0f8bfae80fab6a4fd51f9eef649d39d2ca207

                    SHA256

                    5b0769adfc6b5cf246d064d1b9e90c82bca4707df8eb54dafa79de1368f116ce

                    SHA512

                    27ccdfcab13d17311efcc63a877e19709bb418101c21ccac6f3e2b9863e5ae5729751acd66b05a536ef665291fd931ed68ec96530839435e422abbc8ca9f8219

                  • C:\Windows\SysWOW64\oballjsi\pjjbeose.exe

                    Filesize

                    10.2MB

                    MD5

                    9d3099dbd494a2b5ea6e547addb1b2d4

                    SHA1

                    70e0f8bfae80fab6a4fd51f9eef649d39d2ca207

                    SHA256

                    5b0769adfc6b5cf246d064d1b9e90c82bca4707df8eb54dafa79de1368f116ce

                    SHA512

                    27ccdfcab13d17311efcc63a877e19709bb418101c21ccac6f3e2b9863e5ae5729751acd66b05a536ef665291fd931ed68ec96530839435e422abbc8ca9f8219

                  • memory/1236-2-0x0000000000670000-0x0000000000683000-memory.dmp

                    Filesize

                    76KB

                  • memory/1236-3-0x0000000000400000-0x00000000004EA000-memory.dmp

                    Filesize

                    936KB

                  • memory/1236-1-0x0000000000570000-0x0000000000670000-memory.dmp

                    Filesize

                    1024KB

                  • memory/1236-15-0x0000000000400000-0x00000000004EA000-memory.dmp

                    Filesize

                    936KB

                  • memory/1868-16-0x0000000000400000-0x00000000004EA000-memory.dmp

                    Filesize

                    936KB

                  • memory/1868-8-0x00000000005E0000-0x00000000006E0000-memory.dmp

                    Filesize

                    1024KB

                  • memory/1868-9-0x0000000000CB0000-0x0000000000CC3000-memory.dmp

                    Filesize

                    76KB

                  • memory/1868-10-0x0000000000400000-0x00000000004EA000-memory.dmp

                    Filesize

                    936KB

                  • memory/4860-34-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-39-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-17-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                    Filesize

                    84KB

                  • memory/4860-18-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                    Filesize

                    84KB

                  • memory/4860-20-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                    Filesize

                    84KB

                  • memory/4860-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                    Filesize

                    2.1MB

                  • memory/4860-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                    Filesize

                    2.1MB

                  • memory/4860-25-0x0000000000CA0000-0x0000000000CA6000-memory.dmp

                    Filesize

                    24KB

                  • memory/4860-28-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-33-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-11-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                    Filesize

                    84KB

                  • memory/4860-31-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-32-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-37-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-35-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                    Filesize

                    84KB

                  • memory/4860-38-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-40-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-36-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-47-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-52-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/4860-51-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                    Filesize

                    20KB

                  • memory/4860-48-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                    Filesize

                    20KB

                  • memory/4860-45-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-56-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

                    Filesize

                    28KB

                  • memory/4860-55-0x0000000007A00000-0x0000000007E0B000-memory.dmp

                    Filesize

                    4.0MB

                  • memory/4860-46-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-44-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-43-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-42-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB

                  • memory/4860-41-0x0000000000DF0000-0x0000000000E00000-memory.dmp

                    Filesize

                    64KB