Analysis

  • max time kernel
    144s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21-05-2024 05:54

General

  • Target

    a6c7dd82eace106350d20d93956360e6.exe

  • Size

    178KB

  • MD5

    a6c7dd82eace106350d20d93956360e6

  • SHA1

    19c5ea0607b527e4c2b08a39583db38f503933e0

  • SHA256

    b7ab94357342f73380569c9b23bc81741e1784b8a7cfdfe8df680000a1f3da1f

  • SHA512

    6e3d950e1a16103710985e9e0993f26ece5f7d67eadbd711941e826117d0d884624ddf166d3a70e25453518bb2f7d9a9c2dede25f6785dcb24d6031ba29c419e

  • SSDEEP

    1536:DAc76NGJEzLoCPMkXzxIGzA9aRmNjo/Phcnr6xMtxUtoIlESP5tA9bDQqpN+X:D7kXzxIGzA9aUo/PhcnVHUtoe5K9

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) 2 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\a6c7dd82eace106350d20d93956360e6.exe
    "C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3648
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\czahzcfs\
      2⤵
        PID:3584
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wujrkavr.exe" C:\Windows\SysWOW64\czahzcfs\
        2⤵
          PID:4660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create czahzcfs binPath= "C:\Windows\SysWOW64\czahzcfs\wujrkavr.exe /d\"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description czahzcfs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start czahzcfs
          2⤵
          • Launches sc.exe
          PID:2324
        • 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:4620
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3648 -s 1036
          2⤵
          • Program crash
          PID:3656
      • C:\Windows\SysWOW64\czahzcfs\wujrkavr.exe
        C:\Windows\SysWOW64\czahzcfs\wujrkavr.exe /d"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2148
        • 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:2708
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2148 -s 560
          2⤵
          • Program crash
          PID:4924
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2148 -ip 2148
        1⤵
          PID:4092
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 3648 -ip 3648
          1⤵
            PID:4720

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            12.5MB

            MD5

            dd27b001d10a3dd6802fbe312a35e3bf

            SHA1

            5113659d7fd40b94c37289fb811d138709ba99e5

            SHA256

            b91656719c87ee3ce8dbf40efbf964468db6bf7f6252f288a04e69bae50e5403

            SHA512

            c86ecdcafd08cd659f0e55079f4f30ce6ae4501811c2c1ed53328fa62d0c896e4a4066d54a35211f64ce92330c77f162088c7d4d93863ff15cc27ce08d0b47f6

          • memory/2148-10-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/2708-41-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-32-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-8-0x0000000000360000-0x0000000000375000-memory.dmp
            Filesize

            84KB

          • memory/2708-40-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-21-0x0000000000440000-0x0000000000446000-memory.dmp
            Filesize

            24KB

          • memory/2708-39-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-29-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-14-0x0000000000360000-0x0000000000375000-memory.dmp
            Filesize

            84KB

          • memory/2708-15-0x0000000000360000-0x0000000000375000-memory.dmp
            Filesize

            84KB

          • memory/2708-17-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2708-51-0x0000000007140000-0x000000000754B000-memory.dmp
            Filesize

            4.0MB

          • memory/2708-52-0x00000000027E0000-0x00000000027E7000-memory.dmp
            Filesize

            28KB

          • memory/2708-48-0x0000000007140000-0x000000000754B000-memory.dmp
            Filesize

            4.0MB

          • memory/2708-47-0x00000000027D0000-0x00000000027D5000-memory.dmp
            Filesize

            20KB

          • memory/2708-44-0x00000000027D0000-0x00000000027D5000-memory.dmp
            Filesize

            20KB

          • memory/2708-43-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-24-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-42-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-20-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2708-38-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-37-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-36-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-35-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-34-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-33-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-27-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-31-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-30-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/2708-28-0x0000000001930000-0x0000000001940000-memory.dmp
            Filesize

            64KB

          • memory/3648-4-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3648-1-0x00000000024E0000-0x00000000025E0000-memory.dmp
            Filesize

            1024KB

          • memory/3648-13-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3648-11-0x0000000000400000-0x0000000002349000-memory.dmp
            Filesize

            31.3MB

          • memory/3648-2-0x00000000024B0000-0x00000000024C3000-memory.dmp
            Filesize

            76KB

          • memory/3648-12-0x00000000024B0000-0x00000000024C3000-memory.dmp
            Filesize

            76KB