Analysis

  • max time kernel
    28s
  • 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 22:29

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:4652
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3912
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:4460
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2256
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:4612
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2488
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:4348
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4464
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:4712
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:2324
              • C:\Windows\SysWOW64\rundll32.exe
                RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                3⤵
                  PID:1372
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1280
                • C:\Windows\SysWOW64\rundll32.exe
                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                  3⤵
                    PID:4468
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3828
                  • C:\Windows\SysWOW64\rundll32.exe
                    RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                    3⤵
                      PID:4180
                  • 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:1184
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:4924
                      • C:\Windows\SysWOW64\rundll32.exe
                        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                        3⤵
                          PID:1384
                      • C:\Windows\SysWOW64\cmd.exe
                        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:5000
                        • C:\Windows\SysWOW64\rundll32.exe
                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                          3⤵
                            PID:1956
                        • C:\Windows\SysWOW64\cmd.exe
                          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                          2⤵
                            PID:1912
                            • C:\Windows\SysWOW64\rundll32.exe
                              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                              3⤵
                                PID:4856
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                              2⤵
                                PID:1564
                                • C:\Windows\SysWOW64\rundll32.exe
                                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                  3⤵
                                    PID:2292
                                • 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:3200
                                    • 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:2040
                                  • 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:4220
                                      • 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:2856
                                    • 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:3228
                                        • 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:240
                                      • 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:1120
                                          • 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:4292
                                        • 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:4144
                                            • 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:4248
                                          • 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:4852
                                              • 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:2432
                                            • 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:4512
                                                • 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:2404
                                              • 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:1032
                                                  • 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:2120
                                                • 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:2952
                                                    • 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:688
                                                  • 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:2336
                                                      • 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:3844
                                                    • 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:5068
                                                        • 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:4556
                                                        • C:\Windows\SysWOW64\icacls.exe
                                                          icacls C:\Windows\System32\svchost.exe /grant "Admin:F"
                                                          3⤵
                                                          • Possible privilege escalation attempt
                                                          • Modifies file permissions
                                                          PID:1560
                                                      • 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:3960
                                                          • 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:4016
                                                          • C:\Windows\SysWOW64\icacls.exe
                                                            icacls C:\Windows\System32\drivers\afunix.sys /grant "Admin:F"
                                                            3⤵
                                                            • Possible privilege escalation attempt
                                                            • Modifies file permissions
                                                            PID:4764
                                                        • 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:2064
                                                            • 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:4600
                                                            • C:\Windows\SysWOW64\icacls.exe
                                                              icacls C:\Windows\System32\drivers\gm.dls /grant "Admin:F"
                                                              3⤵
                                                              • Possible privilege escalation attempt
                                                              • Modifies file permissions
                                                              PID:3596
                                                          • 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:4748
                                                              • 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:3160
                                                              • C:\Windows\SysWOW64\icacls.exe
                                                                icacls C:\Windows\System32\drivers\gmreadme.txt /grant "Admin:F"
                                                                3⤵
                                                                • Possible privilege escalation attempt
                                                                • Modifies file permissions
                                                                PID:1784

                                                          Network

                                                          MITRE ATT&CK Enterprise v15

                                                          Replay Monitor

                                                          Loading Replay Monitor...

                                                          Downloads

                                                          • C:\Users\Admin\Desktop\◄█σÿř√íõ▼½Ÿ√ń►9¾éæ▌▀π≈◘Âčé♫ï╚♫▀☺☺■■řÇ¥«¥▼¢ßß╤54¶å¾╤Ÿ«ö8☻Æ◘♀∩ø—╬♠Ç■Ç♣ńö∞ń↕žÇč○↑žåõφ9ø£ó╤æ▀ö94ńå▐řéœ♫²

                                                            Filesize

                                                            666B

                                                            MD5

                                                            9e1e5883c74742a497cf5c272ccd2321

                                                            SHA1

                                                            2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                            SHA256

                                                            ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                            SHA512

                                                            f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                          • memory/4652-0-0x0000000000660000-0x00000000006BC000-memory.dmp

                                                            Filesize

                                                            368KB

                                                          • memory/4652-1-0x0000000074690000-0x0000000074E41000-memory.dmp

                                                            Filesize

                                                            7.7MB

                                                          • memory/4652-2-0x0000000005130000-0x00000000051C2000-memory.dmp

                                                            Filesize

                                                            584KB

                                                          • memory/4652-3-0x0000000005780000-0x0000000005D26000-memory.dmp

                                                            Filesize

                                                            5.6MB

                                                          • memory/4652-4-0x0000000005390000-0x00000000053A0000-memory.dmp

                                                            Filesize

                                                            64KB

                                                          • memory/4652-309-0x00000000053E0000-0x00000000053EA000-memory.dmp

                                                            Filesize

                                                            40KB

                                                          • memory/4652-310-0x0000000074690000-0x0000000074E41000-memory.dmp

                                                            Filesize

                                                            7.7MB

                                                          • memory/4652-311-0x0000000005390000-0x00000000053A0000-memory.dmp

                                                            Filesize

                                                            64KB