Analysis

  • max time kernel
    161s
  • max time network
    174s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:35

General

  • Target

    489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e.exe

  • Size

    307KB

  • MD5

    002577e928a32cc049a70cc3dfd32f1a

  • SHA1

    3260f1f784d1423c622b895cd8df6198c10afef2

  • SHA256

    489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e

  • SHA512

    b696003b75d28c5b5004e9ad5f0d6d2d5685eccbb59935d870a222c28a10700281690df42b95ab745aaafa7c0a4987ea52d8b54792e481ba49f8af81fd86ca82

  • SSDEEP

    3072:TTUp9FKYtnJVHdc+O4vVUfF3vjS2MA7215s6pJUMu63jXdo:U5KWJVHdhftUBbVMA72E6pLjX

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 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\489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e.exe
    "C:\Users\Admin\AppData\Local\Temp\489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\igtbjyzb\
      2⤵
        PID:2716
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jvhmjpoc.exe" C:\Windows\SysWOW64\igtbjyzb\
        2⤵
          PID:1816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create igtbjyzb binPath= "C:\Windows\SysWOW64\igtbjyzb\jvhmjpoc.exe /d\"C:\Users\Admin\AppData\Local\Temp\489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1188
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description igtbjyzb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start igtbjyzb
          2⤵
          • Launches sc.exe
          PID:2284
        • 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:4408
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2688 -s 1204
          2⤵
          • Program crash
          PID:5072
      • C:\Windows\SysWOW64\igtbjyzb\jvhmjpoc.exe
        C:\Windows\SysWOW64\igtbjyzb\jvhmjpoc.exe /d"C:\Users\Admin\AppData\Local\Temp\489f26c346d2ff193ea6802b5c23e2bfa596960d2358d10ca70c60e590f61d3e.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2440
        • 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:4684
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2440 -s 532
          2⤵
          • Program crash
          PID:4080
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2688 -ip 2688
        1⤵
          PID:5048
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 2440 -ip 2440
          1⤵
            PID:752

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.1MB

            MD5

            4d6e0fe9e9549c79f3a7782ab74c146c

            SHA1

            839f86ca72c52416b86056eab93d1c70b80c901d

            SHA256

            0bf6033f695cb19af41a5c950f7031688564f4941106403e84c12456f32f9495

            SHA512

            346b502a9cba4cada7456baff439301fc83b11d0a055d1a547e81f0fc90bcbc5a25ca5783578f8e772b21a0fd64f6472ace2a5dfac35a59c70444bb29515d4f3

          • memory/2440-16-0x0000000000400000-0x0000000002AC2000-memory.dmp

            Filesize

            38.8MB

          • memory/2440-11-0x0000000002D80000-0x0000000002E80000-memory.dmp

            Filesize

            1024KB

          • memory/2440-18-0x0000000000400000-0x0000000002AC2000-memory.dmp

            Filesize

            38.8MB

          • memory/2688-2-0x0000000002C10000-0x0000000002C23000-memory.dmp

            Filesize

            76KB

          • memory/2688-4-0x0000000000400000-0x0000000002AC2000-memory.dmp

            Filesize

            38.8MB

          • memory/2688-8-0x0000000000400000-0x0000000002AC2000-memory.dmp

            Filesize

            38.8MB

          • memory/2688-9-0x0000000002C10000-0x0000000002C23000-memory.dmp

            Filesize

            76KB

          • memory/2688-1-0x0000000002DF0000-0x0000000002EF0000-memory.dmp

            Filesize

            1024KB

          • memory/4684-33-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-39-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-19-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

            Filesize

            84KB

          • memory/4684-15-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

            Filesize

            84KB

          • memory/4684-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4684-24-0x0000000002800000-0x0000000002A0F000-memory.dmp

            Filesize

            2.1MB

          • memory/4684-25-0x0000000001F60000-0x0000000001F66000-memory.dmp

            Filesize

            24KB

          • memory/4684-28-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-31-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-34-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-35-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-12-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

            Filesize

            84KB

          • memory/4684-32-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-36-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-37-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-17-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

            Filesize

            84KB

          • memory/4684-38-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-40-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-41-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-42-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-44-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-43-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-45-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-46-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-47-0x0000000001F70000-0x0000000001F80000-memory.dmp

            Filesize

            64KB

          • memory/4684-48-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

            Filesize

            20KB

          • memory/4684-51-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

            Filesize

            20KB

          • memory/4684-52-0x0000000007680000-0x0000000007A8B000-memory.dmp

            Filesize

            4.0MB

          • memory/4684-55-0x0000000007680000-0x0000000007A8B000-memory.dmp

            Filesize

            4.0MB

          • memory/4684-56-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

            Filesize

            28KB

          • memory/4684-60-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

            Filesize

            84KB