Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-07-2024 15:16

General

  • Target

    rRBVVlBwia.exe

  • Size

    301KB

  • MD5

    547d22725d299a21760e957f1522d03b

  • SHA1

    5fc9a7b3d3b118b38d1b76f33eba59ba3f49e33e

  • SHA256

    d99e41c304f50b2548a79f43cfea1de5d96ceb38b254ed8057b59ae190916200

  • SHA512

    ee486698fa1952464d08a9987679b2a28fc1d54cb9635ed92392f896368375f60ed139bc82ee846d35ea1f6ec409989a7aa9bbd1c39912fdbec15f375a0cb4ea

  • SSDEEP

    3072:eMbOOm6/FBMTUrZXzYzRbWW2DA6mMY0bX2pk0Bhi25P3SSklv9ATu:eMDLt5ZXkzRitDcMpbXMk0Dvx3kN9AT

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) 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
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\rRBVVlBwia.exe
    "C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vswgptso\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5016
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\fdnoqmpv.exe" C:\Windows\SysWOW64\vswgptso\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4512
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vswgptso binPath= "C:\Windows\SysWOW64\vswgptso\fdnoqmpv.exe /d\"C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3420
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vswgptso "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:216
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vswgptso
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2848
    • 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:3512
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 936 -s 1036
      2⤵
      • Program crash
      PID:1424
  • C:\Windows\SysWOW64\vswgptso\fdnoqmpv.exe
    C:\Windows\SysWOW64\vswgptso\fdnoqmpv.exe /d"C:\Users\Admin\AppData\Local\Temp\rRBVVlBwia.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3600
    • 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:2360
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3600 -s 560
      2⤵
      • Program crash
      PID:1516
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 936 -ip 936
    1⤵
      PID:224
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3600 -ip 3600
      1⤵
        PID:4844

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\fdnoqmpv.exe
        Filesize

        10.1MB

        MD5

        dd39f7348382e68277df149e233db842

        SHA1

        d083fb01ccef8d84506e2c66aae5be3a382e3ff6

        SHA256

        536ec67ca2d7923e69e8dda668df5889fcabc710b8ddca69ed01125bff699534

        SHA512

        59f80ee41e66cc4311142c0011f4c11ee8c05efd8ddf0b3af8b50af3fffb31b47c2017c77736a424ca07cd08b002807fdc0697ca85023ec535032981b834f55a

      • memory/936-2-0x00000000041C0000-0x00000000041D3000-memory.dmp
        Filesize

        76KB

      • memory/936-1-0x0000000002720000-0x0000000002820000-memory.dmp
        Filesize

        1024KB

      • memory/936-4-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/936-9-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/936-8-0x00000000041C0000-0x00000000041D3000-memory.dmp
        Filesize

        76KB

      • memory/936-7-0x0000000000400000-0x0000000002464000-memory.dmp
        Filesize

        32.4MB

      • memory/2360-41-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-37-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-14-0x0000000000760000-0x0000000000775000-memory.dmp
        Filesize

        84KB

      • memory/2360-21-0x0000000001D20000-0x0000000001D26000-memory.dmp
        Filesize

        24KB

      • memory/2360-52-0x0000000002BE0000-0x0000000002BE7000-memory.dmp
        Filesize

        28KB

      • memory/2360-51-0x0000000007540000-0x000000000794B000-memory.dmp
        Filesize

        4.0MB

      • memory/2360-48-0x0000000007540000-0x000000000794B000-memory.dmp
        Filesize

        4.0MB

      • memory/2360-47-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
        Filesize

        20KB

      • memory/2360-44-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
        Filesize

        20KB

      • memory/2360-43-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-42-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-13-0x0000000000760000-0x0000000000775000-memory.dmp
        Filesize

        84KB

      • memory/2360-40-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-39-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-38-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-11-0x0000000000760000-0x0000000000775000-memory.dmp
        Filesize

        84KB

      • memory/2360-36-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-35-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-34-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-33-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-32-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-31-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-30-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-29-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-28-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-27-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-24-0x0000000001D30000-0x0000000001D40000-memory.dmp
        Filesize

        64KB

      • memory/2360-20-0x0000000002600000-0x000000000280F000-memory.dmp
        Filesize

        2.1MB

      • memory/2360-18-0x0000000002600000-0x000000000280F000-memory.dmp
        Filesize

        2.1MB

      • memory/3600-15-0x0000000000400000-0x0000000002464000-memory.dmp
        Filesize

        32.4MB