Analysis

  • max time kernel
    85s
  • max time network
    88s
  • 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 07:07

General

  • Target

    0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200(1).exe

  • Size

    143KB

  • MD5

    11a13a4119b82c74377f732e076d309b

  • SHA1

    ce30d46c4dedc1480e3932fc6ae80d3cbb1b2287

  • SHA256

    0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200

  • SHA512

    885b44fe0c03be3cc16b54105ab9883d46f8056a73d073695a29bfa2a9ee28591785d6fa0fab9eb9facf4126351a199b990dd103dfcacf2661c5a562b95d2ba8

  • SSDEEP

    3072:WwlwoI6VD/+52UZ7iVAMhRnR9qp7KkD1k7y:Xw0VDy74AW/47pw

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 5 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200(1).exe
    "C:\Users\Admin\AppData\Local\Temp\0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200(1).exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ndbljduk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1408
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\kacpgyj.exe" C:\Windows\SysWOW64\ndbljduk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3548
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ndbljduk binPath= "C:\Windows\SysWOW64\ndbljduk\kacpgyj.exe /d\"C:\Users\Admin\AppData\Local\Temp\0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200(1).exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2564
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ndbljduk "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2380
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ndbljduk
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3456
    • 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:5116
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2404 -s 1160
      2⤵
      • Program crash
      PID:3388
  • C:\Windows\SysWOW64\ndbljduk\kacpgyj.exe
    C:\Windows\SysWOW64\ndbljduk\kacpgyj.exe /d"C:\Users\Admin\AppData\Local\Temp\0001160ade94fc6a9966f5db1029ad8b348f477d692526fce1d2d18c34694200(1).exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1120
    • 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:2116
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1120 -s 536
      2⤵
      • Program crash
      PID:1240
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2404 -ip 2404
    1⤵
      PID:3392
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1120 -ip 1120
      1⤵
        PID:1136

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.8MB

        MD5

        49bc3d55acceb8c0a60cc27afecb2a0c

        SHA1

        06ddcad4ad6ffb0cecdaaa31750756d37716bfce

        SHA256

        e21328a82281769c7f18eea250bbe60d519b73c1013ef19160bf9c3bfdd53e8c

        SHA512

        84d88c4b358f232f79044506b496f05a9a5665802e01c95034d8f9836865a2ad1e8c6973d754ad6110c33db7d9a5c73911ee45dee4d34443b5926bc9c53a1bdc

      • memory/1120-8-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/1120-16-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/1120-9-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/2116-42-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-27-0x0000000003200000-0x000000000340F000-memory.dmp

        Filesize

        2.1MB

      • memory/2116-10-0x00000000012B0000-0x00000000012C5000-memory.dmp

        Filesize

        84KB

      • memory/2116-14-0x00000000012B0000-0x00000000012C5000-memory.dmp

        Filesize

        84KB

      • memory/2116-59-0x00000000035E0000-0x00000000035E7000-memory.dmp

        Filesize

        28KB

      • memory/2116-49-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-28-0x00000000027E0000-0x00000000027E6000-memory.dmp

        Filesize

        24KB

      • memory/2116-31-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-50-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-20-0x00000000012B0000-0x00000000012C5000-memory.dmp

        Filesize

        84KB

      • memory/2116-21-0x00000000012B0000-0x00000000012C5000-memory.dmp

        Filesize

        84KB

      • memory/2116-22-0x00000000012B0000-0x00000000012C5000-memory.dmp

        Filesize

        84KB

      • memory/2116-41-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-25-0x0000000003200000-0x000000000340F000-memory.dmp

        Filesize

        2.1MB

      • memory/2116-55-0x0000000008100000-0x000000000850B000-memory.dmp

        Filesize

        4.0MB

      • memory/2116-58-0x0000000008100000-0x000000000850B000-memory.dmp

        Filesize

        4.0MB

      • memory/2116-54-0x00000000035D0000-0x00000000035D5000-memory.dmp

        Filesize

        20KB

      • memory/2116-51-0x00000000035D0000-0x00000000035D5000-memory.dmp

        Filesize

        20KB

      • memory/2116-34-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-35-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-43-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-47-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-46-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-45-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-44-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-48-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-36-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-40-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-39-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-38-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2116-37-0x00000000027F0000-0x0000000002800000-memory.dmp

        Filesize

        64KB

      • memory/2404-2-0x00000000005B0000-0x00000000005C3000-memory.dmp

        Filesize

        76KB

      • memory/2404-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2404-18-0x00000000005B0000-0x00000000005C3000-memory.dmp

        Filesize

        76KB

      • memory/2404-19-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2404-17-0x0000000000400000-0x000000000045A000-memory.dmp

        Filesize

        360KB

      • memory/2404-1-0x00000000007C0000-0x00000000008C0000-memory.dmp

        Filesize

        1024KB

      • memory/2404-13-0x00000000007C0000-0x00000000008C0000-memory.dmp

        Filesize

        1024KB