Analysis

  • max time kernel
    149s
  • max time network
    154s
  • 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, 05:19

General

  • Target

    c512b0dccb9f92204e6fb655c6b51333.exe

  • Size

    10.1MB

  • MD5

    c512b0dccb9f92204e6fb655c6b51333

  • SHA1

    dd085d130c33c357e829863630a4377be11c76da

  • SHA256

    c78d053710f55ecd76867851e5ef0a5fc387ff22e146aeeb6055b928a74322e1

  • SHA512

    c3c55b079d61a5efa9f3c3960763063024a4d7a500a9ffbd8bd8273e78de42f836d4e86b9d1ce8c8e1031c001e9905b7b49ef614420f55d1d8c810969a79f351

  • SSDEEP

    12288:nljL7ioRGJyDJSuiAZzlsO+++++++++++++++++++++++++++++++++++++++++W:p7hR5QAZi

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).

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c512b0dccb9f92204e6fb655c6b51333.exe
    "C:\Users\Admin\AppData\Local\Temp\c512b0dccb9f92204e6fb655c6b51333.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:420
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cryrgrir\
      2⤵
        PID:2408
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\obxnvcxh.exe" C:\Windows\SysWOW64\cryrgrir\
        2⤵
          PID:1936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cryrgrir binPath= "C:\Windows\SysWOW64\cryrgrir\obxnvcxh.exe /d\"C:\Users\Admin\AppData\Local\Temp\c512b0dccb9f92204e6fb655c6b51333.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cryrgrir "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1932
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cryrgrir
          2⤵
          • Launches sc.exe
          PID:2132
        • 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:4172
      • C:\Windows\SysWOW64\cryrgrir\obxnvcxh.exe
        C:\Windows\SysWOW64\cryrgrir\obxnvcxh.exe /d"C:\Users\Admin\AppData\Local\Temp\c512b0dccb9f92204e6fb655c6b51333.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1300
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          PID:1276

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              6.8MB

              MD5

              3ff06adc89f3447e84281b00d462afc3

              SHA1

              e01af46570c511db04ecd7336a33a7c385add6df

              SHA256

              cdf77ec387a3a35b20f7ff29083642a3a7c19e65b1ceaae0f5882bd0a820bad8

              SHA512

              523d6e51c541ca6a477c96f00a501b540799c6b71cc1e9f25af9b52d9b84f4ee8b59bd392637897ecccb2e431aab00b4d7d13d548afdaa5892dfbf1ad617b052

            • C:\Windows\SysWOW64\cryrgrir\obxnvcxh.exe

              Filesize

              50KB

              MD5

              dc4a27d88d299b8f3697e05ea761b5a7

              SHA1

              74e4c44097daddfe7a463b7b4a9971726409aef5

              SHA256

              54370381b87d44e483cb3528ac48c89731a050e8212328003e8b77c1e84de4a2

              SHA512

              5f9d40f9d34c252afca10256427330c94038eaf67b9cebbf8d6d52e704dd8a7f1e2b7c837307182b963c7a46d05a5143c6284e5ca9941753057ece6a6d17c965

            • memory/420-9-0x00000000034B0000-0x00000000034C3000-memory.dmp

              Filesize

              76KB

            • memory/420-4-0x0000000000400000-0x0000000003250000-memory.dmp

              Filesize

              46.3MB

            • memory/420-2-0x00000000034B0000-0x00000000034C3000-memory.dmp

              Filesize

              76KB

            • memory/420-7-0x0000000000400000-0x0000000003250000-memory.dmp

              Filesize

              46.3MB

            • memory/420-1-0x0000000003550000-0x0000000003650000-memory.dmp

              Filesize

              1024KB

            • memory/1276-11-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

              Filesize

              84KB

            • memory/1276-14-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

              Filesize

              84KB

            • memory/1276-17-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

              Filesize

              84KB

            • memory/1276-18-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

              Filesize

              84KB

            • memory/1276-19-0x0000000000FB0000-0x0000000000FC5000-memory.dmp

              Filesize

              84KB

            • memory/1300-10-0x00000000032A0000-0x00000000033A0000-memory.dmp

              Filesize

              1024KB

            • memory/1300-16-0x0000000000400000-0x0000000003250000-memory.dmp

              Filesize

              46.3MB

            • memory/1300-15-0x0000000000400000-0x0000000003250000-memory.dmp

              Filesize

              46.3MB