Analysis

  • max time kernel
    33s
  • max time network
    19s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    02-03-2024 20:22

General

  • Target

    Chernobyl.exe

  • Size

    342KB

  • MD5

    a7232fbaf3f64cd41a7328eee2d14a43

  • SHA1

    f176725ce1fca25c405f00668a3230facbec9215

  • SHA256

    4576346568c222356606fe5a5c9e7e2a7141fbedcd0b93c3d7825f00a7622d33

  • SHA512

    dbe94db8639a3337f756d240af3fe52852e8a64863d8711dd102c9f911dbbdb97e8235dec5ab70e4146464b0d1db2a41fc41b157dec352c36b12279ecc3ce918

  • SSDEEP

    6144:sRbao0222222222222222222222222222222222222222222222222222222222C:8kwOZzv4TatsNqaJg

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 14 IoCs
  • Modifies file permissions 1 TTPs 14 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 14 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:2488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:892
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:1572
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1608
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:2176
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:1300
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:2112
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2160
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:1744
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:2476
              • C:\Windows\SysWOW64\rundll32.exe
                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                3⤵
                  PID:880
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1968
                • C:\Windows\SysWOW64\rundll32.exe
                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                  3⤵
                    PID:2604
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                  2⤵
                    PID:2016
                    • C:\Windows\SysWOW64\rundll32.exe
                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                      3⤵
                        PID:2552
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                      2⤵
                        PID:2608
                        • C:\Windows\SysWOW64\rundll32.exe
                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                          3⤵
                            PID:2496
                        • C:\Windows\SysWOW64\cmd.exe
                          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                          2⤵
                            PID:2592
                            • C:\Windows\SysWOW64\rundll32.exe
                              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                              3⤵
                                PID:2560
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                              2⤵
                                PID:2512
                                • C:\Windows\SysWOW64\rundll32.exe
                                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                  3⤵
                                    PID:2532
                                • C:\Windows\SysWOW64\cmd.exe
                                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                  2⤵
                                    PID:2620
                                    • C:\Windows\SysWOW64\rundll32.exe
                                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                      3⤵
                                        PID:2400
                                    • C:\Windows\SysWOW64\cmd.exe
                                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                      2⤵
                                        PID:2424
                                        • C:\Windows\SysWOW64\rundll32.exe
                                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                          3⤵
                                            PID:2452
                                        • 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:2472
                                            • 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:1996
                                          • 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:2988
                                              • 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:528
                                            • 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:2380
                                                • 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:1144
                                                • C:\Windows\SysWOW64\icacls.exe
                                                  icacls C:\Windows\System32\wininit.exe /grant "Admin:F"
                                                  3⤵
                                                  • Possible privilege escalation attempt
                                                  • Modifies file permissions
                                                  PID:1540
                                              • 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:1524
                                                  • 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:1884
                                                • 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:744
                                                    • 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:1428
                                                  • 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:2788
                                                      • 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:1972
                                                    • 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:2804
                                                        • 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:2136
                                                      • 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:1292
                                                          • 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:1028
                                                        • 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:2436
                                                            • 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:1732
                                                          • 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:2712
                                                              • 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:1652
                                                              • C:\Windows\SysWOW64\icacls.exe
                                                                icacls C:\Windows\System32\ntoskrnl.exe /grant "Admin:F"
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                PID:2768
                                                            • 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:2384
                                                                • 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:1660
                                                                • C:\Windows\SysWOW64\icacls.exe
                                                                  icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
                                                                  3⤵
                                                                  • Possible privilege escalation attempt
                                                                  • Modifies file permissions
                                                                  PID:2752

                                                            Network

                                                            MITRE ATT&CK Enterprise v15

                                                            Replay Monitor

                                                            Loading Replay Monitor...

                                                            Downloads

                                                            • C:\Users\Admin\Desktop\↕6╚♣ß™₧♫Ÿ▲╔1╠æõ╬♂╬ÿ²Â¶±☼öΣ╥Ÿ■πě╠¢½≈Æï♂▼╤εčõř√♦22▼פσ17™►ěσ▀œ♠1☻ÿ♂↕®○ε®®╩►7ΣΣ«õ5Æ≈♠╚Æÿ4▀☻½▄ó■☺Âčě☻2▼

                                                              Filesize

                                                              666B

                                                              MD5

                                                              9e1e5883c74742a497cf5c272ccd2321

                                                              SHA1

                                                              2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                              SHA256

                                                              ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                              SHA512

                                                              f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                            • memory/2488-0-0x00000000002E0000-0x000000000033C000-memory.dmp

                                                              Filesize

                                                              368KB

                                                            • memory/2488-1-0x0000000073FB0000-0x000000007469E000-memory.dmp

                                                              Filesize

                                                              6.9MB

                                                            • memory/2488-2-0x00000000043B0000-0x00000000043F0000-memory.dmp

                                                              Filesize

                                                              256KB

                                                            • memory/2488-307-0x0000000073FB0000-0x000000007469E000-memory.dmp

                                                              Filesize

                                                              6.9MB

                                                            • memory/2488-308-0x00000000043B0000-0x00000000043F0000-memory.dmp

                                                              Filesize

                                                              256KB

                                                            • memory/2488-309-0x00000000043B0000-0x00000000043F0000-memory.dmp

                                                              Filesize

                                                              256KB