Analysis

  • max time kernel
    156s
  • max time network
    164s
  • 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 13:00

General

  • Target

    8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe

  • Size

    331KB

  • MD5

    3424a650d03640ec89fbb499d6674480

  • SHA1

    1ea36d7a77ec67039e67f944280dfdcdf1582991

  • SHA256

    8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1

  • SHA512

    5f8bed9cf3da89216af3b87d580535a29a67a617b8bee82e448ae2d02f4cf38975058d2a0d02cf3d48411745a8fc19d09eb5936b66d7be1c75d31087142e2411

  • SSDEEP

    6144:/K6gQvvYlQo7wU9TZlSmHgafhoeyz5xYmX/M:C5QvvYlhbCmHgGhoeYxYmE

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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe
    "C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3176
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aqlbiqxn\
      2⤵
        PID:4468
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xvkslbws.exe" C:\Windows\SysWOW64\aqlbiqxn\
        2⤵
          PID:1796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create aqlbiqxn binPath= "C:\Windows\SysWOW64\aqlbiqxn\xvkslbws.exe /d\"C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description aqlbiqxn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:968
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start aqlbiqxn
          2⤵
          • Launches sc.exe
          PID:2112
        • 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:412
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3176 -s 1028
          2⤵
          • Program crash
          PID:2316
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3176 -ip 3176
        1⤵
          PID:3084
        • C:\Windows\SysWOW64\aqlbiqxn\xvkslbws.exe
          C:\Windows\SysWOW64\aqlbiqxn\xvkslbws.exe /d"C:\Users\Admin\AppData\Local\Temp\8e94ab9df264de254c2961478a718dd9e960b8701a4aa75015fde99d1f1020b1.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:828
          • 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:1532
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 828 -s 528
            2⤵
            • Program crash
            PID:4536
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 828 -ip 828
          1⤵
            PID:4744
          • 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=4136 --field-trial-handle=3192,i,2785050981002401924,4037047756083432660,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:468

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              12.4MB

              MD5

              06471ef2e86cb301a5b640ffc2e75f07

              SHA1

              361b08e064a7cd323ed04aee796211bf9869df24

              SHA256

              a6ecce99afc4bc8da8a03f29c699f4360a533f4ee391b434e883328732f9d8f5

              SHA512

              51de20c17337b059aedcf611f58f3a25ba8c74528a7fd325cc7cbf2ca2d96f6eb5909f203a440d8095cecc977855d8c541087d401c6f41b6184691996cb02dae

            • memory/828-21-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB

            • memory/828-14-0x00000000006B0000-0x00000000007B0000-memory.dmp

              Filesize

              1024KB

            • memory/828-15-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB

            • memory/1532-35-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-59-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

              Filesize

              28KB

            • memory/1532-63-0x0000000000CF0000-0x0000000000D05000-memory.dmp

              Filesize

              84KB

            • memory/1532-38-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-58-0x0000000007900000-0x0000000007D0B000-memory.dmp

              Filesize

              4.0MB

            • memory/1532-55-0x0000000007900000-0x0000000007D0B000-memory.dmp

              Filesize

              4.0MB

            • memory/1532-16-0x0000000000CF0000-0x0000000000D05000-memory.dmp

              Filesize

              84KB

            • memory/1532-54-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

              Filesize

              20KB

            • memory/1532-37-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-51-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

              Filesize

              20KB

            • memory/1532-22-0x0000000000CF0000-0x0000000000D05000-memory.dmp

              Filesize

              84KB

            • memory/1532-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

              Filesize

              2.1MB

            • memory/1532-27-0x0000000002A00000-0x0000000002C0F000-memory.dmp

              Filesize

              2.1MB

            • memory/1532-28-0x00000000021A0000-0x00000000021A6000-memory.dmp

              Filesize

              24KB

            • memory/1532-31-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-34-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-50-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-36-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-20-0x0000000000CF0000-0x0000000000D05000-memory.dmp

              Filesize

              84KB

            • memory/1532-49-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-44-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-40-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-41-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-42-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-43-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-39-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-46-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-45-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-47-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/1532-48-0x00000000021B0000-0x00000000021C0000-memory.dmp

              Filesize

              64KB

            • memory/3176-7-0x00000000006C0000-0x00000000007C0000-memory.dmp

              Filesize

              1024KB

            • memory/3176-1-0x00000000006C0000-0x00000000007C0000-memory.dmp

              Filesize

              1024KB

            • memory/3176-2-0x00000000008C0000-0x00000000008D3000-memory.dmp

              Filesize

              76KB

            • memory/3176-3-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB

            • memory/3176-4-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB

            • memory/3176-11-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB

            • memory/3176-10-0x00000000008C0000-0x00000000008D3000-memory.dmp

              Filesize

              76KB

            • memory/3176-6-0x0000000000400000-0x000000000045C000-memory.dmp

              Filesize

              368KB