Analysis

  • max time kernel
    150s
  • max time network
    163s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/10/2023, 19:02

General

  • Target

    file.exe

  • Size

    216KB

  • MD5

    21c68b05ac982cff12afcb9af3a5657d

  • SHA1

    3651d8e4e0fdc66c1f888e34337ae2c13cb9b904

  • SHA256

    19a4f6df26db3df254ccf6270b2abe2ef6bcf86264cd17acaa5a46995672bbe4

  • SHA512

    734382f3432b09248f02799b1ada19787fd29402164a551494c7197f3b45a2527edf1e5b44a907f7cda70b04351acbc547c309f31f8c4347cc16a059a24a8131

  • SSDEEP

    3072:jHXfua5zpSxP5RcWrYlwRabrTRqQxSCcSd5PYe5OT99c:rfua5zK5RPslwCxS0A5Ts

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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 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:2584
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wdxmdpzp\
      2⤵
        PID:4704
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dttqcoec.exe" C:\Windows\SysWOW64\wdxmdpzp\
        2⤵
          PID:4196
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wdxmdpzp binPath= "C:\Windows\SysWOW64\wdxmdpzp\dttqcoec.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4584
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wdxmdpzp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wdxmdpzp
          2⤵
          • Launches sc.exe
          PID:780
        • 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:5068
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2584 -s 1036
          2⤵
          • Program crash
          PID:3532
      • C:\Windows\SysWOW64\wdxmdpzp\dttqcoec.exe
        C:\Windows\SysWOW64\wdxmdpzp\dttqcoec.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1228
        • 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:3632
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1228 -s 524
          2⤵
          • Program crash
          PID:4832
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2584 -ip 2584
        1⤵
          PID:2184
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1228 -ip 1228
          1⤵
            PID:4872

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

                Loading Replay Monitor...

                Downloads

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

                  Filesize

                  10.3MB

                  MD5

                  d976d3c751b268ed61524200c410d37a

                  SHA1

                  881c7b9e19fa43c6e70acd05a0e8b5a347213282

                  SHA256

                  6e6e0163a714c251fa7b5bd04340d69cec492b9aef5799c3ca7dd1bf11b40e45

                  SHA512

                  e24ad73321639750803d97daa9844aa123611af29f94f3b610b67228c38b452e23c2f18fb778ce27385783313ef59ff9ba17309b130090061eda870e0c1dfe7e

                • C:\Windows\SysWOW64\wdxmdpzp\dttqcoec.exe

                  Filesize

                  10.3MB

                  MD5

                  d976d3c751b268ed61524200c410d37a

                  SHA1

                  881c7b9e19fa43c6e70acd05a0e8b5a347213282

                  SHA256

                  6e6e0163a714c251fa7b5bd04340d69cec492b9aef5799c3ca7dd1bf11b40e45

                  SHA512

                  e24ad73321639750803d97daa9844aa123611af29f94f3b610b67228c38b452e23c2f18fb778ce27385783313ef59ff9ba17309b130090061eda870e0c1dfe7e

                • memory/1228-19-0x0000000000400000-0x00000000005AD000-memory.dmp

                  Filesize

                  1.7MB

                • memory/1228-11-0x00000000006B0000-0x00000000007B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1228-12-0x0000000000400000-0x00000000005AD000-memory.dmp

                  Filesize

                  1.7MB

                • memory/2584-2-0x00000000021B0000-0x00000000021C3000-memory.dmp

                  Filesize

                  76KB

                • memory/2584-4-0x0000000000400000-0x00000000005AD000-memory.dmp

                  Filesize

                  1.7MB

                • memory/2584-8-0x0000000000400000-0x00000000005AD000-memory.dmp

                  Filesize

                  1.7MB

                • memory/2584-10-0x00000000021B0000-0x00000000021C3000-memory.dmp

                  Filesize

                  76KB

                • memory/2584-1-0x00000000007F0000-0x00000000008F0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3632-34-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-39-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-17-0x0000000000F90000-0x0000000000FA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-21-0x0000000000F90000-0x0000000000FA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-22-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3632-25-0x0000000002E00000-0x000000000300F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/3632-26-0x0000000002540000-0x0000000002546000-memory.dmp

                  Filesize

                  24KB

                • memory/3632-29-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-32-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-33-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-13-0x0000000000F90000-0x0000000000FA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-35-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-36-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-37-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-38-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-18-0x0000000000F90000-0x0000000000FA5000-memory.dmp

                  Filesize

                  84KB

                • memory/3632-40-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-41-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-42-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-43-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-45-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-44-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-46-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-48-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-47-0x0000000002550000-0x0000000002560000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-49-0x00000000025E0000-0x00000000025E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3632-52-0x00000000025E0000-0x00000000025E5000-memory.dmp

                  Filesize

                  20KB

                • memory/3632-53-0x0000000007D80000-0x000000000818B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/3632-57-0x00000000025F0000-0x00000000025F7000-memory.dmp

                  Filesize

                  28KB

                • memory/3632-56-0x0000000007D80000-0x000000000818B000-memory.dmp

                  Filesize

                  4.0MB