Analysis

  • max time kernel
    148s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-09-2022 07:17

General

  • Target

    f5a2b47d112ad48b217f27a0ffc4014e.exe

  • Size

    201KB

  • MD5

    f5a2b47d112ad48b217f27a0ffc4014e

  • SHA1

    be36dbcfced8ae41257aa9f01598ddf232ece6fe

  • SHA256

    0ef96177554f1cd2eea823b6dc0c3dc54aec830827a2e82f59aed9fe7b896ba5

  • SHA512

    ba59b8939e00fad5ff72780952571d86820c18fc2b891e4d8367dfc2d61b24c57eaec46a8eb236c79a3728d6fad902c6a13497015407977f33f8a3e07aa75458

  • SSDEEP

    3072:kGDc4L5uExDN5+AXZMj1Uc+ub/PbvB4AqdBc619NOL/PkIXx:PL7xtktbnbJ45

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 3 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\f5a2b47d112ad48b217f27a0ffc4014e.exe
    "C:\Users\Admin\AppData\Local\Temp\f5a2b47d112ad48b217f27a0ffc4014e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3972
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ugavwytp\
      2⤵
        PID:3392
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\upzvjuz.exe" C:\Windows\SysWOW64\ugavwytp\
        2⤵
          PID:2284
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ugavwytp binPath= "C:\Windows\SysWOW64\ugavwytp\upzvjuz.exe /d\"C:\Users\Admin\AppData\Local\Temp\f5a2b47d112ad48b217f27a0ffc4014e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1712
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ugavwytp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:688
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ugavwytp
          2⤵
          • Launches sc.exe
          PID:852
        • 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:1384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3972 -s 1296
          2⤵
          • Program crash
          PID:4472
      • C:\Windows\SysWOW64\ugavwytp\upzvjuz.exe
        C:\Windows\SysWOW64\ugavwytp\upzvjuz.exe /d"C:\Users\Admin\AppData\Local\Temp\f5a2b47d112ad48b217f27a0ffc4014e.exe"
        1⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3988
        • 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:476
          • 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:644
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3988 -s 516
          2⤵
          • Program crash
          PID:3364
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3972 -ip 3972
        1⤵
          PID:2340
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3988 -ip 3988
          1⤵
            PID:4300

          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\upzvjuz.exe
            Filesize

            13.6MB

            MD5

            e82e64e84272a0b10eb12e0f459c024b

            SHA1

            7857c7910ca9b422acf03692613cf7a9d3ca0fb8

            SHA256

            d32c6e6416267049e6f4b3cdfefe873ced5f7f7c426aa3d51c935b1ca3f7ee19

            SHA512

            d76d02b01369af53a33f5e7999f072eb138c8be71d7dfc9de742286d0fa5eaa1fc8450bf0465a4c584c1e0f38905a6d5fb376c509c72d4bf14be4bd098a118fe

          • C:\Windows\SysWOW64\ugavwytp\upzvjuz.exe
            Filesize

            13.6MB

            MD5

            e82e64e84272a0b10eb12e0f459c024b

            SHA1

            7857c7910ca9b422acf03692613cf7a9d3ca0fb8

            SHA256

            d32c6e6416267049e6f4b3cdfefe873ced5f7f7c426aa3d51c935b1ca3f7ee19

            SHA512

            d76d02b01369af53a33f5e7999f072eb138c8be71d7dfc9de742286d0fa5eaa1fc8450bf0465a4c584c1e0f38905a6d5fb376c509c72d4bf14be4bd098a118fe

          • memory/476-153-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/476-162-0x00000000017F0000-0x00000000017F5000-memory.dmp
            Filesize

            20KB

          • memory/476-168-0x00000000027D0000-0x00000000027D7000-memory.dmp
            Filesize

            28KB

          • memory/476-165-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/476-159-0x0000000000E90000-0x0000000000EA0000-memory.dmp
            Filesize

            64KB

          • memory/476-156-0x0000000000E80000-0x0000000000E86000-memory.dmp
            Filesize

            24KB

          • memory/476-152-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/476-151-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/476-145-0x0000000000000000-mapping.dmp
          • memory/476-146-0x0000000000400000-0x0000000000415000-memory.dmp
            Filesize

            84KB

          • memory/644-171-0x0000000000000000-mapping.dmp
          • memory/644-177-0x00000000008D0000-0x00000000009C1000-memory.dmp
            Filesize

            964KB

          • memory/644-172-0x00000000008D0000-0x00000000009C1000-memory.dmp
            Filesize

            964KB

          • memory/688-140-0x0000000000000000-mapping.dmp
          • memory/852-141-0x0000000000000000-mapping.dmp
          • memory/1384-143-0x0000000000000000-mapping.dmp
          • memory/1712-139-0x0000000000000000-mapping.dmp
          • memory/2284-137-0x0000000000000000-mapping.dmp
          • memory/3392-136-0x0000000000000000-mapping.dmp
          • memory/3972-144-0x0000000000400000-0x000000000058C000-memory.dmp
            Filesize

            1.5MB

          • memory/3972-133-0x0000000000660000-0x0000000000760000-memory.dmp
            Filesize

            1024KB

          • memory/3972-135-0x0000000000400000-0x000000000058C000-memory.dmp
            Filesize

            1.5MB

          • memory/3972-134-0x0000000000600000-0x0000000000613000-memory.dmp
            Filesize

            76KB

          • memory/3988-150-0x0000000000400000-0x000000000058C000-memory.dmp
            Filesize

            1.5MB

          • memory/3988-149-0x0000000000763000-0x0000000000773000-memory.dmp
            Filesize

            64KB