Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/11/2022, 00:35

General

  • Target
    file.exe
  • Size 193KB
  • Sample221112-axcc6aff4w
  • SHA256 acf08148565c0c59ac043666e0ad22dbced1e5486b093ccc8192f3b2c9b95af8
  • 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:2808
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\prgeycl\
      2⤵
        PID:2384
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hgfghrtw.exe" C:\Windows\SysWOW64\prgeycl\
        2⤵
          PID:3540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create prgeycl binPath= "C:\Windows\SysWOW64\prgeycl\hgfghrtw.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description prgeycl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start prgeycl
          2⤵
          • Launches sc.exe
          PID:400
        • 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:4552
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2808 -s 1044
          2⤵
          • Program crash
          PID:3392
      • C:\Windows\SysWOW64\prgeycl\hgfghrtw.exe
        C:\Windows\SysWOW64\prgeycl\hgfghrtw.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:440
        • 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:1160
          • 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:876
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 440 -s 508
          2⤵
          • Program crash
          PID:1088
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2808 -ip 2808
        1⤵
          PID:4720
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 440 -ip 440
          1⤵
            PID:4192

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                hgfghrtw.exe

                • Path C:\Users\Admin\AppData\Local\Temp\hgfghrtw.exe
                • Size 11.1MB
                • SHA256 1ab68edb1d92ce1ae3dfa332943ff971e35fab31b949238b7c8543bb9365c886
                • MD5 SHA1 SHA512 SSDEEP

                hgfghrtw.exe

                • Path C:\Windows\SysWOW64\prgeycl\hgfghrtw.exe
                • Size 11.1MB
                • SHA256 1ab68edb1d92ce1ae3dfa332943ff971e35fab31b949238b7c8543bb9365c886
                • MD5 SHA1 SHA512 SSDEEP

                memory/440-150-0x0000000000400000-0x000000000058B000-memory.dmp

                memory/440-149-0x0000000000923000-0x0000000000933000-memory.dmp

                memory/876-177-0x0000000000870000-0x0000000000961000-memory.dmp

                memory/876-172-0x0000000000870000-0x0000000000961000-memory.dmp

                memory/1160-159-0x0000000001F20000-0x0000000001F30000-memory.dmp

                memory/1160-152-0x00000000009A0000-0x00000000009B5000-memory.dmp

                memory/1160-168-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

                memory/1160-165-0x0000000007740000-0x0000000007B4B000-memory.dmp

                memory/1160-146-0x00000000009A0000-0x00000000009B5000-memory.dmp

                memory/1160-162-0x0000000001FF0000-0x0000000001FF5000-memory.dmp

                memory/1160-156-0x0000000001F10000-0x0000000001F16000-memory.dmp

                memory/1160-151-0x00000000009A0000-0x00000000009B5000-memory.dmp

                memory/1160-153-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/2808-132-0x00000000006B9000-0x00000000006CA000-memory.dmp

                memory/2808-144-0x0000000000400000-0x000000000058B000-memory.dmp

                memory/2808-143-0x00000000006B9000-0x00000000006CA000-memory.dmp

                memory/2808-134-0x0000000000400000-0x000000000058B000-memory.dmp

                memory/2808-133-0x0000000002180000-0x0000000002193000-memory.dmp