Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/12/2022, 07:01

General

  • Target
    file.exe
  • Size 217KB
  • Sample221220-hs782agh78
  • SHA256 35d244906ab34798bdec9490a12b29276802c3b4f29129f2ba62a360ce033a6c
  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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.

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 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:2500
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xacnvplp\
      2⤵
        PID:2092
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ekxslsfa.exe" C:\Windows\SysWOW64\xacnvplp\
        2⤵
          PID:3380
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xacnvplp binPath= "C:\Windows\SysWOW64\xacnvplp\ekxslsfa.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xacnvplp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xacnvplp
          2⤵
          • Launches sc.exe
          PID:1700
        • 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:4184
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2500 -s 592
          2⤵
          • Program crash
          PID:2128
      • C:\Windows\SysWOW64\xacnvplp\ekxslsfa.exe
        C:\Windows\SysWOW64\xacnvplp\ekxslsfa.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4196
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:380
          • 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:1944
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4196 -s 556
          2⤵
          • Program crash
          PID:3248
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2500 -ip 2500
        1⤵
          PID:4540
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 180 -p 4196 -ip 4196
          1⤵
            PID:1032

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ekxslsfa.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ekxslsfa.exe
                • Size 13.5MB
                • SHA256 fb927e1cf86f09a49b93c11840e391fd49102f4fa243b6c0a67142c9b73ab13d
                • MD5 SHA1 SHA512 SSDEEP

                ekxslsfa.exe

                • Path C:\Windows\SysWOW64\xacnvplp\ekxslsfa.exe
                • Size 13.5MB
                • SHA256 fb927e1cf86f09a49b93c11840e391fd49102f4fa243b6c0a67142c9b73ab13d
                • MD5 SHA1 SHA512 SSDEEP

                memory/380-159-0x00000000025B0000-0x00000000025C0000-memory.dmp

                memory/380-153-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/380-165-0x0000000007E00000-0x000000000820B000-memory.dmp

                memory/380-162-0x00000000033D0000-0x00000000033D5000-memory.dmp

                memory/380-156-0x00000000025A0000-0x00000000025A6000-memory.dmp

                memory/380-168-0x00000000033E0000-0x00000000033E7000-memory.dmp

                memory/380-152-0x0000000001230000-0x0000000001245000-memory.dmp

                memory/380-151-0x0000000001230000-0x0000000001245000-memory.dmp

                memory/380-146-0x0000000001230000-0x0000000001245000-memory.dmp

                memory/1944-172-0x0000000000E90000-0x0000000000F81000-memory.dmp

                memory/1944-177-0x0000000000E90000-0x0000000000F81000-memory.dmp

                memory/2500-144-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/2500-143-0x0000000000699000-0x00000000006AA000-memory.dmp

                memory/2500-133-0x00000000005C0000-0x00000000005D3000-memory.dmp

                memory/2500-132-0x0000000000699000-0x00000000006AA000-memory.dmp

                memory/2500-134-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/4196-150-0x0000000000400000-0x000000000045F000-memory.dmp

                memory/4196-149-0x00000000007B3000-0x00000000007C3000-memory.dmp