Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-10-2024 14:38

General

  • Target

    e4352f63724267bed81e8c199bd8ca0f.exe

  • Size

    416KB

  • MD5

    e4352f63724267bed81e8c199bd8ca0f

  • SHA1

    ce9c69ca36920f076fe1369be4d9001085ca8602

  • SHA256

    5ffda142aa321a2b5546c426a28403d7f19b51b88985c8617f11c04411489e30

  • SHA512

    afe8786dade10b520aeee40fc661d0f86b370e2c0272be3a462033cdc4b9cf91ddf8a2f2f6628c478da8736dbd7704d8da3b577c5afeb053db79dad1556c8bc4

  • SSDEEP

    3072://IcJg7uMwZi9VaiI2PLP7zIyMDWVYvVtKHpA6PYYNp/GG7Ig7LRACfij5+U/p49:HH0uMvGiI2PLgW4upRfJGuLmHsU

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 8 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e4352f63724267bed81e8c199bd8ca0f.exe
    "C:\Users\Admin\AppData\Local\Temp\e4352f63724267bed81e8c199bd8ca0f.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3552
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\zllexsf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4132
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dwciaxer.exe" C:\Windows\SysWOW64\zllexsf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3064
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create zllexsf binPath= "C:\Windows\SysWOW64\zllexsf\dwciaxer.exe /d\"C:\Users\Admin\AppData\Local\Temp\e4352f63724267bed81e8c199bd8ca0f.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5016
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description zllexsf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:64
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start zllexsf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3960
    • 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:4752
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3552 -s 896
      2⤵
      • Program crash
      PID:2684
  • C:\Windows\SysWOW64\zllexsf\dwciaxer.exe
    C:\Windows\SysWOW64\zllexsf\dwciaxer.exe /d"C:\Users\Admin\AppData\Local\Temp\e4352f63724267bed81e8c199bd8ca0f.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2784
    • 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:3196
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2784 -s 576
      2⤵
      • Program crash
      PID:3028
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2784 -ip 2784
    1⤵
      PID:1048
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 3552 -ip 3552
      1⤵
        PID:4304

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.6MB

        MD5

        91dc8436570a9a90d2b639f866c0f535

        SHA1

        07107211c28c4a66a71c4fe0d392df00b6484883

        SHA256

        9d0b95ee6ba84d54cfa907298eb1baf6def0e9ff6f29173965e2e9f0d7795312

        SHA512

        5baac5e1a719529710aede5676b5ceae47b7f4c6d3cdf7188026ea4c1d2f6dd0a9800e2c387acb29ce17d0f1a21c709e74ca5c0ff03eedfc31ef5af40483124e

      • memory/2784-14-0x0000000000400000-0x0000000000477000-memory.dmp

        Filesize

        476KB

      • memory/2784-8-0x0000000000400000-0x0000000000477000-memory.dmp

        Filesize

        476KB

      • memory/3196-38-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-25-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3196-9-0x0000000001070000-0x0000000001085000-memory.dmp

        Filesize

        84KB

      • memory/3196-47-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-54-0x0000000007C40000-0x000000000804B000-memory.dmp

        Filesize

        4.0MB

      • memory/3196-46-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-26-0x00000000011F0000-0x00000000011F6000-memory.dmp

        Filesize

        24KB

      • memory/3196-32-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-18-0x0000000001070000-0x0000000001085000-memory.dmp

        Filesize

        84KB

      • memory/3196-19-0x0000000001070000-0x0000000001085000-memory.dmp

        Filesize

        84KB

      • memory/3196-21-0x0000000001070000-0x0000000001085000-memory.dmp

        Filesize

        84KB

      • memory/3196-22-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3196-29-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-52-0x00000000023F0000-0x00000000023F5000-memory.dmp

        Filesize

        20KB

      • memory/3196-57-0x00000000031D0000-0x00000000031D7000-memory.dmp

        Filesize

        28KB

      • memory/3196-56-0x0000000007C40000-0x000000000804B000-memory.dmp

        Filesize

        4.0MB

      • memory/3196-49-0x00000000023F0000-0x00000000023F5000-memory.dmp

        Filesize

        20KB

      • memory/3196-48-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-12-0x0000000001070000-0x0000000001085000-memory.dmp

        Filesize

        84KB

      • memory/3196-33-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-44-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-45-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-43-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-42-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-41-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-40-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-39-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-34-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-37-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-36-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3196-35-0x00000000023E0000-0x00000000023F0000-memory.dmp

        Filesize

        64KB

      • memory/3552-1-0x00000000007C0000-0x00000000008C0000-memory.dmp

        Filesize

        1024KB

      • memory/3552-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3552-16-0x0000000000710000-0x0000000000723000-memory.dmp

        Filesize

        76KB

      • memory/3552-17-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3552-15-0x0000000000400000-0x0000000000477000-memory.dmp

        Filesize

        476KB

      • memory/3552-2-0x0000000000710000-0x0000000000723000-memory.dmp

        Filesize

        76KB