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Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/10/2023, 09:35

General

  • Target

    file.exe

  • Size

    208KB

  • MD5

    711979d0ba9c7d2404ab1f1ce2b2f659

  • SHA1

    d79bbfdc8819df8bde19d8421e5d431ece79d516

  • SHA256

    b0630ed90cf85b1628028e32adce8cfbdfdc2036dd82387bd053104480af3e18

  • SHA512

    9432eda4ecb4cdf24228b56d6e7955a833fc81e8af14e736a2a36492acd2ae0bdcfeb6c10191caa86c557d3401718873a1939569046a7968cf17aace35f9e702

  • SSDEEP

    3072:PX9oJTf5hxPsEiohwR8kW6eypJahlL2rdg7q59N4NOmS5oqft8Ih:PGf5DEDoh1kRPPahaZu4mqf

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 1 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.

  • 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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4740
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vzhvuyf\
      2⤵
        PID:3000
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sqabdzci.exe" C:\Windows\SysWOW64\vzhvuyf\
        2⤵
          PID:4832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vzhvuyf binPath= "C:\Windows\SysWOW64\vzhvuyf\sqabdzci.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5020
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vzhvuyf "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vzhvuyf
          2⤵
          • Launches sc.exe
          PID:4004
        • 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:5056
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4740 -s 796
          2⤵
          • Program crash
          PID:2032
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4740 -ip 4740
        1⤵
          PID:3252
        • C:\Windows\SysWOW64\vzhvuyf\sqabdzci.exe
          C:\Windows\SysWOW64\vzhvuyf\sqabdzci.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2972
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:1080
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2972 -s 264
            2⤵
            • Program crash
            PID:4908
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2972 -ip 2972
          1⤵
            PID:3952

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            14.6MB

            MD5

            653fadecca0c0eb01d76000baf51084d

            SHA1

            ec92cab650135b498efd83cc8ece9cea02599047

            SHA256

            6539cb97e617f2c889d6bdac9926d864d7af583232d4099cc936e99aa9f59019

            SHA512

            4a10cca436dfe55b4737530f65ab4f32fd20035447141830b8b8bfb2711045225ccf9a057813753da579a7cc6913384be929a12ed6b09e3c412b0643b6b8ce04

          • C:\Windows\SysWOW64\vzhvuyf\sqabdzci.exe

            Filesize

            14.6MB

            MD5

            653fadecca0c0eb01d76000baf51084d

            SHA1

            ec92cab650135b498efd83cc8ece9cea02599047

            SHA256

            6539cb97e617f2c889d6bdac9926d864d7af583232d4099cc936e99aa9f59019

            SHA512

            4a10cca436dfe55b4737530f65ab4f32fd20035447141830b8b8bfb2711045225ccf9a057813753da579a7cc6913384be929a12ed6b09e3c412b0643b6b8ce04

          • memory/1080-33-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-42-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-56-0x00000000025E0000-0x00000000025E7000-memory.dmp

            Filesize

            28KB

          • memory/1080-55-0x0000000006F80000-0x000000000738B000-memory.dmp

            Filesize

            4.0MB

          • memory/1080-52-0x0000000006F80000-0x000000000738B000-memory.dmp

            Filesize

            4.0MB

          • memory/1080-51-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/1080-48-0x00000000025D0000-0x00000000025D5000-memory.dmp

            Filesize

            20KB

          • memory/1080-47-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-13-0x00000000001B0000-0x00000000001C5000-memory.dmp

            Filesize

            84KB

          • memory/1080-16-0x00000000001B0000-0x00000000001C5000-memory.dmp

            Filesize

            84KB

          • memory/1080-44-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-18-0x00000000001B0000-0x00000000001C5000-memory.dmp

            Filesize

            84KB

          • memory/1080-20-0x00000000001B0000-0x00000000001C5000-memory.dmp

            Filesize

            84KB

          • memory/1080-21-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/1080-24-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/1080-25-0x0000000001760000-0x0000000001766000-memory.dmp

            Filesize

            24KB

          • memory/1080-34-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-32-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-46-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-28-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-37-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-35-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-36-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-31-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-38-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-39-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-40-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-41-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-45-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/1080-43-0x0000000001770000-0x0000000001780000-memory.dmp

            Filesize

            64KB

          • memory/2972-17-0x0000000000400000-0x00000000005AC000-memory.dmp

            Filesize

            1.7MB

          • memory/2972-12-0x0000000000400000-0x00000000005AC000-memory.dmp

            Filesize

            1.7MB

          • memory/2972-11-0x00000000005C0000-0x00000000006C0000-memory.dmp

            Filesize

            1024KB

          • memory/4740-1-0x0000000000870000-0x0000000000970000-memory.dmp

            Filesize

            1024KB

          • memory/4740-3-0x0000000000400000-0x00000000005AC000-memory.dmp

            Filesize

            1.7MB

          • memory/4740-10-0x0000000002310000-0x0000000002323000-memory.dmp

            Filesize

            76KB

          • memory/4740-9-0x0000000000400000-0x00000000005AC000-memory.dmp

            Filesize

            1.7MB

          • memory/4740-2-0x0000000002310000-0x0000000002323000-memory.dmp

            Filesize

            76KB

          • memory/4740-6-0x0000000000400000-0x00000000005AC000-memory.dmp

            Filesize

            1.7MB