Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2023, 12:14

General

  • Target
    file.exe
  • Size 312KB
  • Sample230106-pea5psbf3s
  • SHA256 95d21658c0eaee20c7d5c482dfc9f3bd303fd0bd715dbd29431a6b28b067e673
  • 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:868
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xmylabst\
      2⤵
        PID:3856
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\coxlkgpu.exe" C:\Windows\SysWOW64\xmylabst\
        2⤵
          PID:4612
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xmylabst binPath= "C:\Windows\SysWOW64\xmylabst\coxlkgpu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xmylabst "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xmylabst
          2⤵
          • Launches sc.exe
          PID:1056
        • 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:4416
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 868 -s 900
          2⤵
          • Program crash
          PID:1012
      • C:\Windows\SysWOW64\xmylabst\coxlkgpu.exe
        C:\Windows\SysWOW64\xmylabst\coxlkgpu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:208
        • 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:4848
          • 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:4596
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 208 -s 340
          2⤵
          • Program crash
          PID:4172
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 868 -ip 868
        1⤵
          PID:4740
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 208 -ip 208
          1⤵
            PID:1048

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                coxlkgpu.exe

                • Path C:\Users\Admin\AppData\Local\Temp\coxlkgpu.exe
                • Size 10.8MB
                • SHA256 1fa78439ebfb25bfe3ed0e76481239c0387c175b2d283f6628a0ebf0a29cd6d1
                • MD5 SHA1 SHA512 SSDEEP

                coxlkgpu.exe

                • Path C:\Windows\SysWOW64\xmylabst\coxlkgpu.exe
                • Size 10.8MB
                • SHA256 1fa78439ebfb25bfe3ed0e76481239c0387c175b2d283f6628a0ebf0a29cd6d1
                • MD5 SHA1 SHA512 SSDEEP

                memory/208-150-0x0000000000400000-0x0000000002C40000-memory.dmp

                memory/208-149-0x0000000002EE2000-0x0000000002EF8000-memory.dmp

                memory/868-133-0x00000000030A0000-0x00000000030B3000-memory.dmp

                memory/868-134-0x0000000000400000-0x0000000002C40000-memory.dmp

                memory/868-132-0x0000000002D87000-0x0000000002D9C000-memory.dmp

                memory/868-144-0x0000000000400000-0x0000000002C40000-memory.dmp

                memory/868-143-0x0000000002D87000-0x0000000002D9C000-memory.dmp

                memory/4596-177-0x00000000004C0000-0x00000000005B1000-memory.dmp

                memory/4596-173-0x00000000004C0000-0x00000000005B1000-memory.dmp

                memory/4596-172-0x00000000004C1000-0x0000000000592000-memory.dmp

                memory/4848-146-0x0000000000600000-0x0000000000615000-memory.dmp

                memory/4848-156-0x0000000001970000-0x0000000001976000-memory.dmp

                memory/4848-159-0x0000000001980000-0x0000000001990000-memory.dmp

                memory/4848-162-0x00000000019D0000-0x00000000019D5000-memory.dmp

                memory/4848-165-0x0000000007200000-0x000000000760B000-memory.dmp

                memory/4848-168-0x00000000019E0000-0x00000000019E7000-memory.dmp

                memory/4848-153-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/4848-152-0x0000000000600000-0x0000000000615000-memory.dmp

                memory/4848-151-0x0000000000600000-0x0000000000615000-memory.dmp