Analysis

  • max time kernel
    145s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:34

General

  • Target

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe

  • Size

    203KB

  • MD5

    6b7204c0cb219b7d01999025ccd85fdc

  • SHA1

    1f57fbfdcf6d71d0d5a36602e1e83bc9dee3ac7a

  • SHA256

    8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40

  • SHA512

    68a19f84eb4d73394a2bb2b7629f9582e91b54713b19e71722ba5359636ce36d9aa9951af7b729d65752a7aff916ee91abd87f34c2e4aad43cebef777800742b

  • SSDEEP

    3072:eSf/dfuraZJXENc8uCXJiXK1K2LS1G2B+vioyUSdUuD5BBNcRrxOJ+cmH:eSf/MQ15t1TB+PSHexLco

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) 1 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.

  • 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\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe
    "C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4404
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\noiqqghh\
      2⤵
        PID:1616
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oeapkcai.exe" C:\Windows\SysWOW64\noiqqghh\
        2⤵
          PID:1480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create noiqqghh binPath= "C:\Windows\SysWOW64\noiqqghh\oeapkcai.exe /d\"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4548
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description noiqqghh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2356
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start noiqqghh
          2⤵
          • Launches sc.exe
          PID:2432
        • 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:4232
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 1040
          2⤵
          • Program crash
          PID:3400
      • C:\Windows\SysWOW64\noiqqghh\oeapkcai.exe
        C:\Windows\SysWOW64\noiqqghh\oeapkcai.exe /d"C:\Users\Admin\AppData\Local\Temp\8240e21305559cabc41ccf60e6683e8fb3f6ae80a20e289e687366ccc4594c40.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3028
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4268
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3028 -s 524
          2⤵
          • Program crash
          PID:4436
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4404 -ip 4404
        1⤵
          PID:3420
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3028 -ip 3028
          1⤵
            PID:4408
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1932 --field-trial-handle=2284,i,9807419199535700662,2319175108930815708,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:3944

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              11.4MB

              MD5

              4d0fba5a9e65a8bb33f8bde4ef91144c

              SHA1

              0e9e9c5f571ed44626fc04245d514d7260265295

              SHA256

              1cf11f4152bf566940f5771986052c1f3b9d29b43170d365d9577f9e2e0a58d3

              SHA512

              2adc61c536af95025ac7bf1a0de8ad99881f1cd336e4f2862cc889025d1428fbb6ccdba8542216b645647b82e97ddd7d61c5135aefc02e39b4ec7a5b3f7f0db5

            • memory/3028-10-0x0000000000590000-0x00000000005A3000-memory.dmp

              Filesize

              76KB

            • memory/3028-18-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/3028-9-0x0000000000700000-0x0000000000800000-memory.dmp

              Filesize

              1024KB

            • memory/3028-11-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/4268-50-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-40-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-60-0x0000000002BD0000-0x0000000002BD7000-memory.dmp

              Filesize

              28KB

            • memory/4268-12-0x00000000007A0000-0x00000000007B5000-memory.dmp

              Filesize

              84KB

            • memory/4268-15-0x00000000007A0000-0x00000000007B5000-memory.dmp

              Filesize

              84KB

            • memory/4268-59-0x0000000007700000-0x0000000007B0B000-memory.dmp

              Filesize

              4.0MB

            • memory/4268-56-0x0000000007700000-0x0000000007B0B000-memory.dmp

              Filesize

              4.0MB

            • memory/4268-55-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

              Filesize

              20KB

            • memory/4268-19-0x00000000007A0000-0x00000000007B5000-memory.dmp

              Filesize

              84KB

            • memory/4268-22-0x00000000007A0000-0x00000000007B5000-memory.dmp

              Filesize

              84KB

            • memory/4268-24-0x00000000007A0000-0x00000000007B5000-memory.dmp

              Filesize

              84KB

            • memory/4268-25-0x0000000002700000-0x000000000290F000-memory.dmp

              Filesize

              2.1MB

            • memory/4268-28-0x0000000002700000-0x000000000290F000-memory.dmp

              Filesize

              2.1MB

            • memory/4268-29-0x0000000001D90000-0x0000000001D96000-memory.dmp

              Filesize

              24KB

            • memory/4268-32-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-35-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-36-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-37-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-39-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-52-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

              Filesize

              20KB

            • memory/4268-38-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-41-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-42-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-45-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-46-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-51-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-49-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-48-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-47-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-44-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4268-43-0x0000000001DA0000-0x0000000001DB0000-memory.dmp

              Filesize

              64KB

            • memory/4404-1-0x0000000000770000-0x0000000000870000-memory.dmp

              Filesize

              1024KB

            • memory/4404-5-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/4404-2-0x0000000002180000-0x0000000002193000-memory.dmp

              Filesize

              76KB

            • memory/4404-17-0x0000000000770000-0x0000000000870000-memory.dmp

              Filesize

              1024KB

            • memory/4404-16-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB

            • memory/4404-3-0x0000000000400000-0x0000000000438000-memory.dmp

              Filesize

              224KB