Analysis

  • max time kernel
    84s
  • max time network
    72s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-03-2024 20:52

General

  • Target

    Chernobyl.exe

  • Size

    343KB

  • MD5

    d576e0520faa40435d5bdc66304205f9

  • SHA1

    b99fce6ebd094e2cbc29e1ed4e47360781e86c47

  • SHA256

    2b6266f14d2ed46e921168fd2b4a5510f40c69cd591800d17ae8ca31fcde28c6

  • SHA512

    6b60a287f3eefbf2c0f2b0f205e88c4ce5a5aad050f59ff5fd1bc8017322039963f51bdd72b0922ec08880ae5da17286c04418c44dd996f0fb7b585f376f4c98

  • SSDEEP

    6144:ab+co0222222222222222222222222222222222222222222222222222222222w:jjkyOZzv4TatsNqaJg

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • UAC bypass 3 TTPs 1 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Disables Task Manager via registry modification
  • Possible privilege escalation attempt 18 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 18 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Modifies WinLogon 2 TTPs 2 IoCs
  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 17 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe
    "C:\Users\Admin\AppData\Local\Temp\Chernobyl.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Disables RegEdit via registry modification
    • Checks computer location settings
    • Checks whether UAC is enabled
    • Modifies WinLogon
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4784
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:436
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:2840
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:5076
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:3108
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4384
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:1280
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:5104
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:3420
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:1720
              • C:\Windows\SysWOW64\rundll32.exe
                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                3⤵
                  PID:4492
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2848
                • C:\Windows\SysWOW64\rundll32.exe
                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                  3⤵
                    PID:232
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:4216
                  • C:\Windows\SysWOW64\rundll32.exe
                    RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                    3⤵
                      PID:3112
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:3908
                    • C:\Windows\SysWOW64\rundll32.exe
                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                      3⤵
                        PID:992
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:3344
                      • C:\Windows\SysWOW64\rundll32.exe
                        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                        3⤵
                          PID:2196
                      • C:\Windows\SysWOW64\cmd.exe
                        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:816
                        • C:\Windows\SysWOW64\rundll32.exe
                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                          3⤵
                            PID:4108
                        • C:\Windows\SysWOW64\cmd.exe
                          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                          2⤵
                            PID:640
                            • C:\Windows\SysWOW64\rundll32.exe
                              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                              3⤵
                                PID:928
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                              2⤵
                                PID:1776
                                • C:\Windows\SysWOW64\rundll32.exe
                                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                  3⤵
                                    PID:3564
                                • C:\Windows\SysWOW64\cmd.exe
                                  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\smss.exe && icacls C:\Windows\System32\smss.exe /grant "%username%:F" && exit
                                  2⤵
                                    PID:4552
                                    • C:\Windows\SysWOW64\takeown.exe
                                      takeown /f C:\Windows\System32\smss.exe
                                      3⤵
                                      • Possible privilege escalation attempt
                                      • Modifies file permissions
                                      • Suspicious use of AdjustPrivilegeToken
                                      PID:3640
                                  • C:\Windows\SysWOW64\cmd.exe
                                    "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\csrss.exe && icacls C:\Windows\System32\csrss.exe /grant "%username%:F" && exit
                                    2⤵
                                      PID:4224
                                      • C:\Windows\SysWOW64\takeown.exe
                                        takeown /f C:\Windows\System32\csrss.exe
                                        3⤵
                                        • Possible privilege escalation attempt
                                        • Modifies file permissions
                                        • Suspicious use of AdjustPrivilegeToken
                                        PID:4904
                                    • C:\Windows\SysWOW64\cmd.exe
                                      "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\wininit.exe && icacls C:\Windows\System32\wininit.exe /grant "%username%:F" && exit
                                      2⤵
                                        PID:452
                                        • C:\Windows\SysWOW64\takeown.exe
                                          takeown /f C:\Windows\System32\wininit.exe
                                          3⤵
                                          • Possible privilege escalation attempt
                                          • Modifies file permissions
                                          • Suspicious use of AdjustPrivilegeToken
                                          PID:2932
                                      • C:\Windows\SysWOW64\cmd.exe
                                        "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\LogonUI.exe && icacls C:\Windows\System32\LogonUI.exe /grant "%username%:F" && exit
                                        2⤵
                                          PID:3152
                                          • C:\Windows\SysWOW64\takeown.exe
                                            takeown /f C:\Windows\System32\LogonUI.exe
                                            3⤵
                                            • Possible privilege escalation attempt
                                            • Modifies file permissions
                                            • Suspicious use of AdjustPrivilegeToken
                                            PID:2604
                                        • C:\Windows\SysWOW64\cmd.exe
                                          "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\lsass.exe && icacls C:\Windows\System32\lsass.exe /grant "%username%:F" && exit
                                          2⤵
                                            PID:4204
                                            • C:\Windows\SysWOW64\takeown.exe
                                              takeown /f C:\Windows\System32\lsass.exe
                                              3⤵
                                              • Possible privilege escalation attempt
                                              • Modifies file permissions
                                              • Suspicious use of AdjustPrivilegeToken
                                              PID:4980
                                          • C:\Windows\SysWOW64\cmd.exe
                                            "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\services.exe && icacls C:\Windows\System32\services.exe /grant "%username%:F" && exit
                                            2⤵
                                              PID:3864
                                              • C:\Windows\SysWOW64\takeown.exe
                                                takeown /f C:\Windows\System32\services.exe
                                                3⤵
                                                • Possible privilege escalation attempt
                                                • Modifies file permissions
                                                • Suspicious use of AdjustPrivilegeToken
                                                PID:4424
                                            • C:\Windows\SysWOW64\cmd.exe
                                              "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winlogon.exe && icacls C:\Windows\System32\winlogon.exe /grant "%username%:F" && exit
                                              2⤵
                                                PID:4852
                                                • C:\Windows\SysWOW64\takeown.exe
                                                  takeown /f C:\Windows\System32\winlogon.exe
                                                  3⤵
                                                  • Possible privilege escalation attempt
                                                  • Modifies file permissions
                                                  • Suspicious use of AdjustPrivilegeToken
                                                  PID:3028
                                              • C:\Windows\SysWOW64\cmd.exe
                                                "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.efi && icacls C:\Windows\System32\winload.efi /grant "%username%:F" && exit
                                                2⤵
                                                  PID:2020
                                                  • C:\Windows\SysWOW64\takeown.exe
                                                    takeown /f C:\Windows\System32\winload.efi
                                                    3⤵
                                                    • Possible privilege escalation attempt
                                                    • Modifies file permissions
                                                    • Suspicious use of AdjustPrivilegeToken
                                                    PID:4484
                                                • C:\Windows\SysWOW64\cmd.exe
                                                  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\winload.exe && icacls C:\Windows\System32\winload.exe /grant "%username%:F" && exit
                                                  2⤵
                                                    PID:2920
                                                    • C:\Windows\SysWOW64\takeown.exe
                                                      takeown /f C:\Windows\System32\winload.exe
                                                      3⤵
                                                      • Possible privilege escalation attempt
                                                      • Modifies file permissions
                                                      • Suspicious use of AdjustPrivilegeToken
                                                      PID:4540
                                                  • C:\Windows\SysWOW64\cmd.exe
                                                    "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\ntoskrnl.exe && icacls C:\Windows\System32\ntoskrnl.exe /grant "%username%:F" && exit
                                                    2⤵
                                                      PID:3852
                                                      • C:\Windows\SysWOW64\takeown.exe
                                                        takeown /f C:\Windows\System32\ntoskrnl.exe
                                                        3⤵
                                                        • Possible privilege escalation attempt
                                                        • Modifies file permissions
                                                        • Suspicious use of AdjustPrivilegeToken
                                                        PID:4168
                                                    • C:\Windows\SysWOW64\cmd.exe
                                                      "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\svchost.exe && icacls C:\Windows\System32\svchost.exe /grant "%username%:F" && exit
                                                      2⤵
                                                        PID:4316
                                                        • C:\Windows\SysWOW64\takeown.exe
                                                          takeown /f C:\Windows\System32\svchost.exe
                                                          3⤵
                                                          • Possible privilege escalation attempt
                                                          • Modifies file permissions
                                                          • Suspicious use of AdjustPrivilegeToken
                                                          PID:4364
                                                        • C:\Windows\SysWOW64\icacls.exe
                                                          icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
                                                          3⤵
                                                          • Possible privilege escalation attempt
                                                          • Modifies file permissions
                                                          PID:5044
                                                      • C:\Windows\SysWOW64\cmd.exe
                                                        "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\drivers\afunix.sys && icacls C:\Windows\System32\drivers\afunix.sys /grant "%username%:F" && exit
                                                        2⤵
                                                          PID:868
                                                          • C:\Windows\SysWOW64\takeown.exe
                                                            takeown /f C:\Windows\System32\drivers\afunix.sys
                                                            3⤵
                                                            • Possible privilege escalation attempt
                                                            • Modifies file permissions
                                                            • Suspicious use of AdjustPrivilegeToken
                                                            PID:3304
                                                          • C:\Windows\SysWOW64\icacls.exe
                                                            icacls C:\Windows\System32\drivers\afunix.sys /grant "Admin:F"
                                                            3⤵
                                                            • Possible privilege escalation attempt
                                                            • Modifies file permissions
                                                            PID:212
                                                        • C:\Windows\SysWOW64\cmd.exe
                                                          "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\drivers\gm.dls && icacls C:\Windows\System32\drivers\gm.dls /grant "%username%:F" && exit
                                                          2⤵
                                                            PID:3940
                                                            • C:\Windows\SysWOW64\takeown.exe
                                                              takeown /f C:\Windows\System32\drivers\gm.dls
                                                              3⤵
                                                              • Possible privilege escalation attempt
                                                              • Modifies file permissions
                                                              • Suspicious use of AdjustPrivilegeToken
                                                              PID:2196
                                                            • C:\Windows\SysWOW64\icacls.exe
                                                              icacls C:\Windows\System32\drivers\gm.dls /grant "Admin:F"
                                                              3⤵
                                                              • Possible privilege escalation attempt
                                                              • Modifies file permissions
                                                              PID:1608
                                                          • C:\Windows\SysWOW64\cmd.exe
                                                            "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\drivers\gmreadme.txt && icacls C:\Windows\System32\drivers\gmreadme.txt /grant "%username%:F" && exit
                                                            2⤵
                                                              PID:784
                                                              • C:\Windows\SysWOW64\takeown.exe
                                                                takeown /f C:\Windows\System32\drivers\gmreadme.txt
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                • Suspicious use of AdjustPrivilegeToken
                                                                PID:3016
                                                              • C:\Windows\SysWOW64\icacls.exe
                                                                icacls C:\Windows\System32\drivers\gmreadme.txt /grant "Admin:F"
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                PID:3276

                                                          Network

                                                          MITRE ATT&CK Enterprise v15

                                                          Replay Monitor

                                                          Loading Replay Monitor...

                                                          Downloads

                                                          • C:\Users\Admin\Desktop\č®↑∩√6◄¶◘♣£☼♠▼5Çœ¼5☻ń²▬ř2ï☻8ï4►č►äε2¶πß▐öσ♂♪í¾╤▄7ó▀♫▌3█ÿń◘35╬6√Ƕ╩π█╧♀½¤σń√×≈►∩▄▄ř◙∩¼◙╚Ÿ╥6█▐↑ž3æ♀šφ▐

                                                            Filesize

                                                            666B

                                                            MD5

                                                            9e1e5883c74742a497cf5c272ccd2321

                                                            SHA1

                                                            2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                            SHA256

                                                            ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                            SHA512

                                                            f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                          • memory/4784-0-0x0000000000010000-0x000000000006C000-memory.dmp

                                                            Filesize

                                                            368KB

                                                          • memory/4784-1-0x0000000074920000-0x00000000750D0000-memory.dmp

                                                            Filesize

                                                            7.7MB

                                                          • memory/4784-2-0x00000000049E0000-0x0000000004A72000-memory.dmp

                                                            Filesize

                                                            584KB

                                                          • memory/4784-3-0x0000000005030000-0x00000000055D4000-memory.dmp

                                                            Filesize

                                                            5.6MB

                                                          • memory/4784-4-0x0000000004DD0000-0x0000000004DE0000-memory.dmp

                                                            Filesize

                                                            64KB

                                                          • memory/4784-309-0x0000000005CF0000-0x0000000005CFA000-memory.dmp

                                                            Filesize

                                                            40KB

                                                          • memory/4784-310-0x0000000074920000-0x00000000750D0000-memory.dmp

                                                            Filesize

                                                            7.7MB

                                                          • memory/4784-311-0x0000000004DD0000-0x0000000004DE0000-memory.dmp

                                                            Filesize

                                                            64KB