Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20240419-en
  • resource tags

    arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-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.

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

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe
    "C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1340
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wbtznsvu\
      2⤵
        PID:3064
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tfviwvnr.exe" C:\Windows\SysWOW64\wbtznsvu\
        2⤵
          PID:2748
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wbtznsvu binPath= "C:\Windows\SysWOW64\wbtznsvu\tfviwvnr.exe /d\"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2280
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wbtznsvu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wbtznsvu
          2⤵
          • Launches sc.exe
          PID:2664
        • 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:2700
      • C:\Windows\SysWOW64\wbtznsvu\tfviwvnr.exe
        C:\Windows\SysWOW64\wbtznsvu\tfviwvnr.exe /d"C:\Users\Admin\AppData\Local\Temp\a6c7dd82eace106350d20d93956360e6.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2920
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2564

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        11.1MB

        MD5

        f526cb5509252ca7d032d6dfd00883b2

        SHA1

        78cfa80476461630d6a56ce623b85be8535f311a

        SHA256

        28a1e2ceed9c0a6f08e07ebd553bdeacd7b8ceb1b8bdc802767364f15c87f906

        SHA512

        8bce65e01f8080f2c26c56dd69cdbbabbdac1e46a26327a166b5c7ddff0b2a6a6314f0465fc70ee4b191a27ca6804fbd6072f15f04dce17d9af057e115961d67

      • memory/1340-16-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1340-2-0x00000000002A0000-0x00000000002B3000-memory.dmp
        Filesize

        76KB

      • memory/1340-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1340-1-0x00000000023C0000-0x00000000024C0000-memory.dmp
        Filesize

        1024KB

      • memory/1340-14-0x0000000000400000-0x0000000002349000-memory.dmp
        Filesize

        31.3MB

      • memory/1340-15-0x00000000002A0000-0x00000000002B3000-memory.dmp
        Filesize

        76KB

      • memory/2564-31-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-34-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-37-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-8-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2564-18-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-20-0x00000000018C0000-0x0000000001ACF000-memory.dmp
        Filesize

        2.1MB

      • memory/2564-24-0x0000000000160000-0x0000000000166000-memory.dmp
        Filesize

        24KB

      • memory/2564-23-0x00000000018C0000-0x0000000001ACF000-memory.dmp
        Filesize

        2.1MB

      • memory/2564-27-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-30-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-11-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-32-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-33-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-35-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-17-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2564-36-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-38-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-47-0x0000000000220000-0x0000000000225000-memory.dmp
        Filesize

        20KB

      • memory/2564-50-0x0000000000220000-0x0000000000225000-memory.dmp
        Filesize

        20KB

      • memory/2564-46-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-45-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-51-0x0000000005900000-0x0000000005D0B000-memory.dmp
        Filesize

        4.0MB

      • memory/2564-54-0x0000000005900000-0x0000000005D0B000-memory.dmp
        Filesize

        4.0MB

      • memory/2564-55-0x0000000000230000-0x0000000000237000-memory.dmp
        Filesize

        28KB

      • memory/2564-44-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-43-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-42-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-41-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-40-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2564-39-0x0000000000210000-0x0000000000220000-memory.dmp
        Filesize

        64KB

      • memory/2920-12-0x0000000000400000-0x0000000002349000-memory.dmp
        Filesize

        31.3MB