Analysis

  • max time kernel
    150s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240419-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240419-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-05-2024 09:22

General

  • Target

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe

  • Size

    13.1MB

  • MD5

    bd09867a761f2cf6666ba7d8a7aae353

  • SHA1

    35ae2f285c46a88fe920ed261ca30b47a1c5050d

  • SHA256

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

  • SHA512

    c1bebbe5bdee67e71c4bc7aade6c3fbfab29083e54794750fb2fe56387c7e58d95febacf1202cbff5ede1793549879248e95043f31f771971f85cbff61fff4e1

  • SSDEEP

    49152:BDY000000000000000000000000000000000000000000000000000000000000H:BD

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe
    "C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4192
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xlvaczpk\
      2⤵
        PID:4728
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yoqdumx.exe" C:\Windows\SysWOW64\xlvaczpk\
        2⤵
          PID:1036
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xlvaczpk binPath= "C:\Windows\SysWOW64\xlvaczpk\yoqdumx.exe /d\"C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xlvaczpk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3444
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xlvaczpk
          2⤵
          • Launches sc.exe
          PID:2332
        • 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
          PID:4952
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4192 -s 1100
          2⤵
          • Program crash
          PID:4352
      • C:\Windows\SysWOW64\xlvaczpk\yoqdumx.exe
        C:\Windows\SysWOW64\xlvaczpk\yoqdumx.exe /d"C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3108
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1912
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3108 -s 532
          2⤵
          • Program crash
          PID:4572
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4192 -ip 4192
        1⤵
          PID:3492
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 3108 -ip 3108
          1⤵
            PID:2920

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            14.5MB

            MD5

            4ab0a7f153be29af8216ebd6ed0e53b1

            SHA1

            fae2f274ad4798bdd003379083f32c849c8b57a1

            SHA256

            8e6b6b8916df9206e35808e11d6499d56899afcd644abed34cbabcb8942a9625

            SHA512

            64544bdd97c3aee3299ff7ad43effe8f4f0355bd476e6a832020aa9b532ac5954a9596fbe240d3cb7f06a687e84df7cf7cb54748a420d870247e847c0c848842

          • memory/1912-41-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-43-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-42-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-52-0x0000000001DE0000-0x0000000001DE7000-memory.dmp

            Filesize

            28KB

          • memory/1912-20-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1912-21-0x0000000001DB0000-0x0000000001DB6000-memory.dmp

            Filesize

            24KB

          • memory/1912-11-0x00000000008C0000-0x00000000008D5000-memory.dmp

            Filesize

            84KB

          • memory/1912-13-0x00000000008C0000-0x00000000008D5000-memory.dmp

            Filesize

            84KB

          • memory/1912-14-0x00000000008C0000-0x00000000008D5000-memory.dmp

            Filesize

            84KB

          • memory/1912-40-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-18-0x0000000002600000-0x000000000280F000-memory.dmp

            Filesize

            2.1MB

          • memory/1912-48-0x0000000007600000-0x0000000007A0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1912-51-0x0000000007600000-0x0000000007A0B000-memory.dmp

            Filesize

            4.0MB

          • memory/1912-47-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/1912-44-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/1912-29-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-24-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-27-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-28-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-39-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-38-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-37-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-36-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-35-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-34-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-33-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-32-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-31-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/1912-30-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/3108-15-0x0000000000400000-0x0000000002C2E000-memory.dmp

            Filesize

            40.2MB

          • memory/4192-4-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/4192-9-0x0000000002F50000-0x0000000002F63000-memory.dmp

            Filesize

            76KB

          • memory/4192-1-0x0000000002C30000-0x0000000002D30000-memory.dmp

            Filesize

            1024KB

          • memory/4192-8-0x0000000000400000-0x0000000002C2E000-memory.dmp

            Filesize

            40.2MB

          • memory/4192-10-0x0000000000400000-0x0000000000415000-memory.dmp

            Filesize

            84KB

          • memory/4192-2-0x0000000002F50000-0x0000000002F63000-memory.dmp

            Filesize

            76KB