Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09-09-2024 16:49

General

  • Target

    c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9.exe

  • Size

    379KB

  • MD5

    95b628b19f244451d5f69a864e24b260

  • SHA1

    a478f681098713f959d89361c09c14d02552e6ed

  • SHA256

    c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9

  • SHA512

    f2755be22ecdb5aa22ac741fd4bb4d1f1fded762106dd04e6926771ba2ceb19414228fab882b609504ece92583084634ff10b1febdcecd26ac70ac40a1aa7caa

  • SSDEEP

    3072:V8XBk++uc5jv/MfYABOMHfa80LxDtamgthsGiOTBILGvmYX0ZSZn0YTwsu9f:mBknHMfYAB1aLLMhsdOdILGmM92f

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\c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9.exe
    "C:\Users\Admin\AppData\Local\Temp\c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1440
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qjahsrqe\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1528
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dpbgdjiw.exe" C:\Windows\SysWOW64\qjahsrqe\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5052
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create qjahsrqe binPath= "C:\Windows\SysWOW64\qjahsrqe\dpbgdjiw.exe /d\"C:\Users\Admin\AppData\Local\Temp\c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3440
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description qjahsrqe "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3196
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start qjahsrqe
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:924
    • 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:548
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1440 -s 1216
      2⤵
      • Program crash
      PID:1116
  • C:\Windows\SysWOW64\qjahsrqe\dpbgdjiw.exe
    C:\Windows\SysWOW64\qjahsrqe\dpbgdjiw.exe /d"C:\Users\Admin\AppData\Local\Temp\c36fbe6dd8f9632176f3927fca2c2e674a5929d33e7d245f1053bf69ec2b11a9.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2036
    • 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:372
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2036 -s 536
      2⤵
      • Program crash
      PID:4868
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1440 -ip 1440
    1⤵
      PID:2480
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 560 -p 2036 -ip 2036
      1⤵
        PID:1580

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.5MB

        MD5

        a31ed9325140f165f2e1bc51aae544da

        SHA1

        923a3ae723aabe7930f009725266c9d3f624b098

        SHA256

        8025a5b53375c14135f2d53ad5d7b249a21ad2e36ad71cb5b99373490a9aec13

        SHA512

        5d26046f0049b99d9b88de000c84d460704cb4437fc635a95c34872ba50396421f45534cd3297a73f014782ade339d1ee8893770d57715b31a11937674bcfc91

      • memory/372-43-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-47-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/372-44-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/372-21-0x0000000000F40000-0x0000000000F46000-memory.dmp

        Filesize

        24KB

      • memory/372-24-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-27-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-11-0x0000000000D80000-0x0000000000D95000-memory.dmp

        Filesize

        84KB

      • memory/372-13-0x0000000000D80000-0x0000000000D95000-memory.dmp

        Filesize

        84KB

      • memory/372-14-0x0000000000D80000-0x0000000000D95000-memory.dmp

        Filesize

        84KB

      • memory/372-28-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-52-0x00000000023E0000-0x00000000023E7000-memory.dmp

        Filesize

        28KB

      • memory/372-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/372-17-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/372-51-0x0000000007B80000-0x0000000007F8B000-memory.dmp

        Filesize

        4.0MB

      • memory/372-48-0x0000000007B80000-0x0000000007F8B000-memory.dmp

        Filesize

        4.0MB

      • memory/372-31-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-29-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-42-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-30-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-41-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-40-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-39-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-38-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-37-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-36-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-35-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-34-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-33-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/372-32-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/1440-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1440-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1440-2-0x0000000002710000-0x0000000002723000-memory.dmp

        Filesize

        76KB

      • memory/1440-7-0x0000000000400000-0x0000000002477000-memory.dmp

        Filesize

        32.5MB

      • memory/1440-8-0x0000000002710000-0x0000000002723000-memory.dmp

        Filesize

        76KB

      • memory/1440-1-0x0000000002770000-0x0000000002870000-memory.dmp

        Filesize

        1024KB

      • memory/2036-15-0x0000000000400000-0x0000000002477000-memory.dmp

        Filesize

        32.5MB