Analysis

  • max time kernel
    146s
  • max time network
    146s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    08/01/2024, 03:42

General

  • Target

    4a585ee0c216369f0392abd7b7ef0c1c.exe

  • Size

    11.4MB

  • MD5

    4a585ee0c216369f0392abd7b7ef0c1c

  • SHA1

    ecd87636940b7b7b650bae8c43f4d7afbcb291ec

  • SHA256

    3fb717331c0f4b48744117e7844a4bcf08333af621cfcfe790d4a5e2dcf810fe

  • SHA512

    8beae9f3b75758469f155b9b8a91d030e3282ab7414edc6ec47572aae5c87e944aec40cb627abc3d0c1c4f7c0730f32d02f1ec7e5511aa4dfc4b610b14a2b5c7

  • SSDEEP

    24576:OjCj10HSqGgeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeW:O/D

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe
    "C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2360
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\coxwlimb\
      2⤵
        PID:2240
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ktbzsuxx.exe" C:\Windows\SysWOW64\coxwlimb\
        2⤵
          PID:2160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create coxwlimb binPath= "C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe /d\"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description coxwlimb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start coxwlimb
          2⤵
          • Launches sc.exe
          PID:2576
        • 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:2688
      • C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe
        C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe /d"C:\Users\Admin\AppData\Local\Temp\4a585ee0c216369f0392abd7b7ef0c1c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2740
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          PID:2496

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              718KB

              MD5

              4a81e1d08c015189e4e35ed1e27b4446

              SHA1

              406819dfd81603a09b0c4ebddcfb5802fbd728f2

              SHA256

              1a68312fc9c1eecfc4e2bf33e494b035b88939552b5c30a47b89b68991fdd4c6

              SHA512

              220821c5114c3df56df4e8506b47c58d29bdaefb636211a2a59bf0868a3f707af26567b817fd88ab609af9d71c946e6cff4a06e724dc1e59c008ffbcfb262628

            • C:\Windows\SysWOW64\coxwlimb\ktbzsuxx.exe

              Filesize

              900KB

              MD5

              68b617af7e26329180753e4e127dcd3a

              SHA1

              e9c5512120f8e08d25504460b1cff4f1552e03e0

              SHA256

              74e3cbac2ed62d100fd6e187e9bcaa95c958bd07c6c6b923f5e3bad20662653f

              SHA512

              bd0930b74fc5ee2d84a6a0d446b40f8ebab8f93e2b362b82e748463f5ebf3e85387528ff71f8abf1b54f084b610ff7b72ec3dfb22d5622c391351e9d62d2b494

            • memory/2360-3-0x00000000001B0000-0x00000000001C3000-memory.dmp

              Filesize

              76KB

            • memory/2360-4-0x0000000000400000-0x000000000046E000-memory.dmp

              Filesize

              440KB

            • memory/2360-1-0x0000000000290000-0x0000000000390000-memory.dmp

              Filesize

              1024KB

            • memory/2360-8-0x0000000000400000-0x000000000046E000-memory.dmp

              Filesize

              440KB

            • memory/2496-12-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/2496-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2496-9-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/2496-18-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/2496-19-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/2496-23-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/2740-14-0x00000000002F0000-0x00000000003F0000-memory.dmp

              Filesize

              1024KB

            • memory/2740-16-0x0000000000400000-0x000000000046E000-memory.dmp

              Filesize

              440KB

            • memory/2740-22-0x00000000002F0000-0x00000000003F0000-memory.dmp

              Filesize

              1024KB