Analysis

  • max time kernel
    144s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 07:13

General

  • Target

    rdmazvej.exe

  • Size

    11.3MB

  • MD5

    b6908bd53df503767bfc98eb0b281382

  • SHA1

    0a2aaa2ad62972b3f0f73c8ef06c61fefe2c2119

  • SHA256

    27a2ca5daecccc99348be56dc60c72643b9c36eb3fc3f09b517893b157dd314c

  • SHA512

    5197ff588c0ec36150b1ae1dcd337c2848e568d4449b8f7f2d827ac30ad0bf8140a0bb68682bbde55eeb2a889eb07e14013f2302ab88cd72c2099c5d150d1cfe

  • SSDEEP

    6144:2w0VDy74AW/47pwSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSn:2w0VD7AW/49

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe
    "C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3212
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sgzvgtdp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3080
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ukqxcosh.exe" C:\Windows\SysWOW64\sgzvgtdp\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1096
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create sgzvgtdp binPath= "C:\Windows\SysWOW64\sgzvgtdp\ukqxcosh.exe /d\"C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2156
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description sgzvgtdp "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4796
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start sgzvgtdp
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3288
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:5060
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3212 -s 1040
      2⤵
      • Program crash
      PID:4804
  • C:\Windows\SysWOW64\sgzvgtdp\ukqxcosh.exe
    C:\Windows\SysWOW64\sgzvgtdp\ukqxcosh.exe /d"C:\Users\Admin\AppData\Local\Temp\rdmazvej.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2264
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1044
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2264 -s 516
      2⤵
      • Program crash
      PID:3596
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3212 -ip 3212
    1⤵
      PID:3908
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 2264 -ip 2264
      1⤵
        PID:4420

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.4MB

        MD5

        bc76bb6546be51b1f6f4635de5268fd1

        SHA1

        52dce9c5f68e238a1b1423c8763b16881b3266f5

        SHA256

        caa6d85c6009f7f6478c96e62087b1a41db355f166eb6614db652ce3f2a0c7dc

        SHA512

        b30c940c6325c3fae865af758a2e4404be22ff2111c67a71cd856adb75da01e7c93c92b013010b562e1cefd58f73c06e0aeb60bc9c0c11b570bfb52eda6c67d8

      • memory/1044-44-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-48-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-27-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/1044-59-0x00000000027E0000-0x00000000027E7000-memory.dmp

        Filesize

        28KB

      • memory/1044-34-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-54-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1044-14-0x00000000003A0000-0x00000000003B5000-memory.dmp

        Filesize

        84KB

      • memory/1044-58-0x0000000007300000-0x000000000770B000-memory.dmp

        Filesize

        4.0MB

      • memory/1044-35-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-36-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-37-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-38-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-20-0x00000000003A0000-0x00000000003B5000-memory.dmp

        Filesize

        84KB

      • memory/1044-21-0x00000000003A0000-0x00000000003B5000-memory.dmp

        Filesize

        84KB

      • memory/1044-22-0x00000000003A0000-0x00000000003B5000-memory.dmp

        Filesize

        84KB

      • memory/1044-42-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-25-0x0000000002400000-0x000000000260F000-memory.dmp

        Filesize

        2.1MB

      • memory/1044-31-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-28-0x00000000019A0000-0x00000000019A6000-memory.dmp

        Filesize

        24KB

      • memory/1044-55-0x0000000007300000-0x000000000770B000-memory.dmp

        Filesize

        4.0MB

      • memory/1044-39-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-40-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-10-0x00000000003A0000-0x00000000003B5000-memory.dmp

        Filesize

        84KB

      • memory/1044-51-0x00000000027D0000-0x00000000027D5000-memory.dmp

        Filesize

        20KB

      • memory/1044-50-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-49-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-47-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-46-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-45-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-41-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/1044-43-0x00000000019B0000-0x00000000019C0000-memory.dmp

        Filesize

        64KB

      • memory/2264-19-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/2264-8-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/2264-9-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/3212-1-0x00000000006D0000-0x00000000007D0000-memory.dmp

        Filesize

        1024KB

      • memory/3212-13-0x00000000006D0000-0x00000000007D0000-memory.dmp

        Filesize

        1024KB

      • memory/3212-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3212-15-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/3212-16-0x0000000002070000-0x0000000002083000-memory.dmp

        Filesize

        76KB

      • memory/3212-17-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3212-2-0x0000000002070000-0x0000000002083000-memory.dmp

        Filesize

        76KB