Analysis

  • max time kernel
    155s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/03/2024, 01:49

General

  • Target

    c4a9c28cd43849f4627561bca275779e.exe

  • Size

    11.5MB

  • MD5

    c4a9c28cd43849f4627561bca275779e

  • SHA1

    83f463f883f83ef8de44c85b69daf1484a4952b9

  • SHA256

    f42d0e2c1568ab7d7ff6add4693f22eb888133cd6bfbdfd45b8863355fdecb6d

  • SHA512

    7f9c24a21bd59529e34f07a8f3d57a593974b9a5605b3f90758bfef36788931aa78d7253bbe43e0cfc8596f83cfa436da38a3130362f3888dbdaaf98fbe21aa4

  • SSDEEP

    24576:ElxdvCcpOKCtBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBr:ElzOR

Malware Config

Extracted

Family

tofsee

C2

defeatwax.ru

refabyd.info

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
  • 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
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c4a9c28cd43849f4627561bca275779e.exe
    "C:\Users\Admin\AppData\Local\Temp\c4a9c28cd43849f4627561bca275779e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1160
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\azqsemep\
      2⤵
        PID:3760
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jcuqozn.exe" C:\Windows\SysWOW64\azqsemep\
        2⤵
          PID:4136
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create azqsemep binPath= "C:\Windows\SysWOW64\azqsemep\jcuqozn.exe /d\"C:\Users\Admin\AppData\Local\Temp\c4a9c28cd43849f4627561bca275779e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description azqsemep "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2156
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start azqsemep
          2⤵
          • Launches sc.exe
          PID:696
        • 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:3684
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1160 -s 1032
          2⤵
          • Program crash
          PID:2420
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 1160 -ip 1160
        1⤵
          PID:4432
        • C:\Windows\SysWOW64\azqsemep\jcuqozn.exe
          C:\Windows\SysWOW64\azqsemep\jcuqozn.exe /d"C:\Users\Admin\AppData\Local\Temp\c4a9c28cd43849f4627561bca275779e.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2960
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Deletes itself
            PID:1844
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2960 -s 516
            2⤵
            • Program crash
            PID:2396
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 2960 -ip 2960
          1⤵
            PID:4428
          • 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=4068 --field-trial-handle=2900,i,14549994492153927475,12895178890800740987,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:3480

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

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

                    Filesize

                    10.6MB

                    MD5

                    a2bc50fe744af23015711dbc342a838c

                    SHA1

                    bbe916432b9d9bf7ea48b2fed91bc88c1289f6ba

                    SHA256

                    217ad582afa06a687a833d120d94726ebc947299bd35876ec3a88c8ee5cebb0a

                    SHA512

                    06a473da057e31554a2ebdeb87aa46fc9f7b33e2b0a67bab54e0b6ac9308898e7ee9936e5de044d661841e3d05c1ba6747ba8b2ca4af294ae72194cb1722fc5c

                  • C:\Windows\SysWOW64\azqsemep\jcuqozn.exe

                    Filesize

                    7.5MB

                    MD5

                    d657654190c9c6f6216eea17b6289b68

                    SHA1

                    36817bf38719027fae0ca5f25d7d8b4b7eb145a1

                    SHA256

                    198d5a289c8799e5b791702491349efd37c52d43bf3b7c3644aca90382020a50

                    SHA512

                    d4117ae075887b365b84de71e2ba82bcfe74332cbf41109204ead37cff95dcd4101537905f692b59512f2d4e7d33e9ae2724c44b0a1f9a958218efa7ab82b471

                  • memory/1160-9-0x0000000000400000-0x0000000000468000-memory.dmp

                    Filesize

                    416KB

                  • memory/1160-5-0x0000000000400000-0x0000000000468000-memory.dmp

                    Filesize

                    416KB

                  • memory/1160-3-0x0000000000400000-0x0000000000468000-memory.dmp

                    Filesize

                    416KB

                  • memory/1160-2-0x0000000000540000-0x0000000000553000-memory.dmp

                    Filesize

                    76KB

                  • memory/1160-1-0x0000000000590000-0x0000000000690000-memory.dmp

                    Filesize

                    1024KB

                  • memory/1160-10-0x0000000000540000-0x0000000000553000-memory.dmp

                    Filesize

                    76KB

                  • memory/1844-13-0x0000000000700000-0x0000000000715000-memory.dmp

                    Filesize

                    84KB

                  • memory/1844-17-0x0000000000700000-0x0000000000715000-memory.dmp

                    Filesize

                    84KB

                  • memory/1844-19-0x0000000000700000-0x0000000000715000-memory.dmp

                    Filesize

                    84KB

                  • memory/1844-22-0x0000000000700000-0x0000000000715000-memory.dmp

                    Filesize

                    84KB

                  • memory/2960-11-0x0000000000470000-0x0000000000570000-memory.dmp

                    Filesize

                    1024KB

                  • memory/2960-12-0x0000000000400000-0x0000000000468000-memory.dmp

                    Filesize

                    416KB

                  • memory/2960-18-0x0000000000400000-0x0000000000468000-memory.dmp

                    Filesize

                    416KB