Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 12:22

General

  • Target

    4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354.exe

  • Size

    220KB

  • MD5

    06d5f0ada968c0a1640846c8023e9ee9

  • SHA1

    961c48464fc79febeca7994b80369004b87bc34b

  • SHA256

    4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354

  • SHA512

    dcb31fd9a44b6216da80482db6d3ebc0ae76bd3679b6c243cb65aa06c359b3ec7a89dca9f9cf3f3387e1c51a0ba1042382304eb19ddfacc1c22b92be18abe6f8

  • SSDEEP

    6144:Vb/qTWJpjKTI1rFeB4jsVSfnLqS5ICk1hcGP:JxJtKTIpEBc6fP

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
  • 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\4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354.exe
    "C:\Users\Admin\AppData\Local\Temp\4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1188
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bjkqshyu\
      2⤵
        PID:4464
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\szcxwqqk.exe" C:\Windows\SysWOW64\bjkqshyu\
        2⤵
          PID:4964
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bjkqshyu binPath= "C:\Windows\SysWOW64\bjkqshyu\szcxwqqk.exe /d\"C:\Users\Admin\AppData\Local\Temp\4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4416
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bjkqshyu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bjkqshyu
          2⤵
          • Launches sc.exe
          PID:4780
        • 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:4072
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1188 -s 592
          2⤵
          • Program crash
          PID:3600
      • C:\Windows\SysWOW64\bjkqshyu\szcxwqqk.exe
        C:\Windows\SysWOW64\bjkqshyu\szcxwqqk.exe /d"C:\Users\Admin\AppData\Local\Temp\4c09c870971edffb8a06d14f0789d17f51522c5df43af48fe14ee926cf721354.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4656
        • 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:3068
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4656 -s 520
          2⤵
          • Program crash
          PID:2528
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1188 -ip 1188
        1⤵
          PID:2976
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 4656 -ip 4656
          1⤵
            PID:1136

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\szcxwqqk.exe
            Filesize

            14.4MB

            MD5

            36e143bdff0041089a3cbf7a2c1b4dcf

            SHA1

            41eb26b135b0a4ece84c555557c20d56b86e3444

            SHA256

            b06829da667f1701e1235a3bf0c4c46e7157bcae341c9c3b3483ec21560cbec7

            SHA512

            cd4f4e4d0c41f3198e8d7b015ae90299d168f6aad71643074a55ee7bae01b67405edfaf9fc714f3e76aa1e80866cd9974a0773c68804d16e33623800615e5c1f

          • memory/1188-1-0x0000000000B00000-0x0000000000C00000-memory.dmp
            Filesize

            1024KB

          • memory/1188-2-0x0000000000A80000-0x0000000000A93000-memory.dmp
            Filesize

            76KB

          • memory/1188-4-0x0000000000400000-0x00000000007C1000-memory.dmp
            Filesize

            3.8MB

          • memory/1188-8-0x0000000000400000-0x00000000007C1000-memory.dmp
            Filesize

            3.8MB

          • memory/1188-9-0x0000000000A80000-0x0000000000A93000-memory.dmp
            Filesize

            76KB

          • memory/3068-32-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-36-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-58-0x00000000004E0000-0x00000000004F5000-memory.dmp
            Filesize

            84KB

          • memory/3068-15-0x00000000004E0000-0x00000000004F5000-memory.dmp
            Filesize

            84KB

          • memory/3068-54-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/3068-17-0x00000000004E0000-0x00000000004F5000-memory.dmp
            Filesize

            84KB

          • memory/3068-19-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/3068-22-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/3068-23-0x0000000000B10000-0x0000000000B16000-memory.dmp
            Filesize

            24KB

          • memory/3068-26-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-30-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-31-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-53-0x0000000007100000-0x000000000750B000-memory.dmp
            Filesize

            4.0MB

          • memory/3068-29-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-33-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-34-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-35-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-11-0x00000000004E0000-0x00000000004F5000-memory.dmp
            Filesize

            84KB

          • memory/3068-37-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-38-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-39-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-40-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-41-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-42-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-43-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-44-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-45-0x00000000019B0000-0x00000000019C0000-memory.dmp
            Filesize

            64KB

          • memory/3068-46-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/3068-49-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/3068-50-0x0000000007100000-0x000000000750B000-memory.dmp
            Filesize

            4.0MB

          • memory/4656-10-0x0000000000960000-0x0000000000A60000-memory.dmp
            Filesize

            1024KB

          • memory/4656-16-0x0000000000400000-0x00000000007C1000-memory.dmp
            Filesize

            3.8MB

          • memory/4656-12-0x0000000000400000-0x00000000007C1000-memory.dmp
            Filesize

            3.8MB