Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-09-2024 21:31

General

  • Target

    2IFYYPRUgO.exe

  • Size

    447KB

  • MD5

    dd9983e56e44b300e97fbead17bbb8ec

  • SHA1

    bcfc4f542d1824b23b5beefe94e8eaa9d487e037

  • SHA256

    16c9a4debb518681ece83ec9f4eb3edfab08cc4231243db1949a64c80e017aa4

  • SHA512

    02663157f5a109a122897fb0ac32eda38a9ed5d289b70ef1541e3ca800e02a41d471879e04d1bd59eb2110e4a0f8cd7851e3bacba04147ffa488997e8a100457

  • SSDEEP

    6144:XZBpoyz+AlKudZ10mVtZ4ELIgjdo7d5UNo4MaGSlrLo5FXCnFk:Xruyz+PMZ10mVrLL/27gWxerCSC

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
  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe
    "C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1864
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vzhoinko\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3976
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cjivddlp.exe" C:\Windows\SysWOW64\vzhoinko\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2900
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create vzhoinko binPath= "C:\Windows\SysWOW64\vzhoinko\cjivddlp.exe /d\"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:740
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description vzhoinko "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3276
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start vzhoinko
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4412
    • 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:1392
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1864 -s 576
      2⤵
      • Program crash
      PID:516
  • C:\Windows\SysWOW64\vzhoinko\cjivddlp.exe
    C:\Windows\SysWOW64\vzhoinko\cjivddlp.exe /d"C:\Users\Admin\AppData\Local\Temp\2IFYYPRUgO.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1176
    • 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:3188
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1176 -s 536
      2⤵
      • Program crash
      PID:1412
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 1864 -ip 1864
    1⤵
      PID:4952
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1176 -ip 1176
      1⤵
        PID:5104

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        13.0MB

        MD5

        77ba4deecf5474c5b9df47dfa8274785

        SHA1

        f6d567dceaba3997ae4bb4dcdd0814daa4e4742b

        SHA256

        24c21c6add7a91ab8c4ce818f30c0209bc592980999bba522ac332a97cd14054

        SHA512

        d79f8579c0b2661893e67600e8f9910d452e67294b6ee3a19cb60883eaff14d93f8abcfbc273485ba24a664d7ff0766d0eeb66a0da7b187e1d2f9137664e4f40

      • memory/1176-15-0x0000000000400000-0x0000000002488000-memory.dmp

        Filesize

        32.5MB

      • memory/1864-2-0x0000000002740000-0x0000000002753000-memory.dmp

        Filesize

        76KB

      • memory/1864-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1864-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1864-8-0x0000000002740000-0x0000000002753000-memory.dmp

        Filesize

        76KB

      • memory/1864-7-0x0000000000400000-0x0000000002488000-memory.dmp

        Filesize

        32.5MB

      • memory/1864-1-0x0000000002780000-0x0000000002880000-memory.dmp

        Filesize

        1024KB

      • memory/3188-45-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

        Filesize

        20KB

      • memory/3188-39-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-13-0x0000000000E70000-0x0000000000E85000-memory.dmp

        Filesize

        84KB

      • memory/3188-52-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

        Filesize

        28KB

      • memory/3188-49-0x0000000007A40000-0x0000000007E4B000-memory.dmp

        Filesize

        4.0MB

      • memory/3188-31-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-29-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-18-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3188-47-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

        Filesize

        20KB

      • memory/3188-51-0x0000000007A40000-0x0000000007E4B000-memory.dmp

        Filesize

        4.0MB

      • memory/3188-11-0x0000000000E70000-0x0000000000E85000-memory.dmp

        Filesize

        84KB

      • memory/3188-43-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-42-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-41-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-40-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-14-0x0000000000E70000-0x0000000000E85000-memory.dmp

        Filesize

        84KB

      • memory/3188-38-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-37-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-36-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-35-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-34-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-33-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-32-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-30-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-28-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-27-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-24-0x00000000021F0000-0x0000000002200000-memory.dmp

        Filesize

        64KB

      • memory/3188-21-0x00000000021E0000-0x00000000021E6000-memory.dmp

        Filesize

        24KB

      • memory/3188-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB