Analysis

  • max time kernel
    328s
  • max time network
    314s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    02-03-2024 21:40

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
  • 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 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:4780
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4932
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:560
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4676
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:4984
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:5024
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:3096
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4188
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:2912
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:4796
              • C:\Windows\SysWOW64\rundll32.exe
                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                3⤵
                  PID:1852
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:5080
                • C:\Windows\SysWOW64\rundll32.exe
                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                  3⤵
                    PID:908
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2060
                  • C:\Windows\SysWOW64\rundll32.exe
                    RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                    3⤵
                      PID:4388
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:4700
                    • C:\Windows\SysWOW64\rundll32.exe
                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                      3⤵
                        PID:1812
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                      2⤵
                        PID:2728
                        • C:\Windows\SysWOW64\rundll32.exe
                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                          3⤵
                            PID:2240
                        • C:\Windows\SysWOW64\cmd.exe
                          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1664
                          • C:\Windows\SysWOW64\rundll32.exe
                            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                            3⤵
                              PID:2020
                          • C:\Windows\SysWOW64\cmd.exe
                            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:660
                            • C:\Windows\SysWOW64\rundll32.exe
                              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                              3⤵
                                PID:4168
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                              2⤵
                                PID:4648
                                • C:\Windows\SysWOW64\rundll32.exe
                                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                  3⤵
                                    PID:5096
                                • 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:2124
                                    • 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:3756
                                  • 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:5092
                                      • 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:2120
                                    • 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:2828
                                        • 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:2268
                                      • 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:4516
                                          • 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:2872
                                        • 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:5052
                                            • 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:4756
                                          • 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:4160
                                              • 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:1720
                                            • 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:2272
                                                • 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:2512
                                              • 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:2476
                                                  • 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:4048
                                                • 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:4484
                                                    • 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:5028
                                                  • 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:4856
                                                      • 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:4664
                                                    • 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:4900
                                                        • 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:3404
                                                        • C:\Windows\SysWOW64\icacls.exe
                                                          icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
                                                          3⤵
                                                          • Possible privilege escalation attempt
                                                          • Modifies file permissions
                                                          PID:2224
                                                      • 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:1324
                                                          • 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:3552
                                                          • C:\Windows\SysWOW64\icacls.exe
                                                            icacls C:\Windows\System32\drivers\afunix.sys /grant "Admin:F"
                                                            3⤵
                                                            • Possible privilege escalation attempt
                                                            • Modifies file permissions
                                                            PID:4824
                                                        • 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:1496
                                                            • 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:4184
                                                            • C:\Windows\SysWOW64\icacls.exe
                                                              icacls C:\Windows\System32\drivers\gm.dls /grant "Admin:F"
                                                              3⤵
                                                              • Possible privilege escalation attempt
                                                              • Modifies file permissions
                                                              PID:3560
                                                          • 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:2168
                                                              • 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:4548
                                                              • C:\Windows\SysWOW64\icacls.exe
                                                                icacls C:\Windows\System32\drivers\gmreadme.txt /grant "Admin:F"
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                PID:2044
                                                          • C:\Windows\System32\cmd.exe
                                                            "C:\Windows\System32\cmd.exe"
                                                            1⤵
                                                              PID:1500
                                                            • C:\Windows\system32\taskmgr.exe
                                                              "C:\Windows\system32\taskmgr.exe" /0
                                                              1⤵
                                                                PID:1624

                                                              Network

                                                              MITRE ATT&CK Enterprise v15

                                                              Replay Monitor

                                                              Loading Replay Monitor...

                                                              Downloads

                                                              • C:\Users\Admin\Desktop\♣2╬æ9é♂•4▼ÿ¼↕∞Æé¥æ◄3◙π¢½ž≈▬♫╬π¾ñ9¤♦▼☺▐►7¼±◄4µ¤5¾☺σń╥ÿ85žε朾♣²×œ¾3♀■×±♦ß®7▐8σ♣ß¼╥4≈9ö•3◙☺▀╬öš±╩£Æ5▐╚

                                                                Filesize

                                                                666B

                                                                MD5

                                                                9e1e5883c74742a497cf5c272ccd2321

                                                                SHA1

                                                                2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                                SHA256

                                                                ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                                SHA512

                                                                f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                              • memory/4780-0-0x0000000000120000-0x000000000017C000-memory.dmp

                                                                Filesize

                                                                368KB

                                                              • memory/4780-1-0x00000000748C0000-0x0000000075071000-memory.dmp

                                                                Filesize

                                                                7.7MB

                                                              • memory/4780-2-0x0000000004BD0000-0x0000000004C62000-memory.dmp

                                                                Filesize

                                                                584KB

                                                              • memory/4780-3-0x0000000005220000-0x00000000057C6000-memory.dmp

                                                                Filesize

                                                                5.6MB

                                                              • memory/4780-4-0x0000000004D30000-0x0000000004D40000-memory.dmp

                                                                Filesize

                                                                64KB

                                                              • memory/4780-309-0x0000000005EC0000-0x0000000005ECA000-memory.dmp

                                                                Filesize

                                                                40KB

                                                              • memory/4780-310-0x00000000748C0000-0x0000000075071000-memory.dmp

                                                                Filesize

                                                                7.7MB

                                                              • memory/4780-311-0x0000000004D30000-0x0000000004D40000-memory.dmp

                                                                Filesize

                                                                64KB