Analysis

  • max time kernel
    20s
  • max time network
    16s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    02-03-2024 20:48

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 20 IoCs
  • Modifies file permissions 1 TTPs 20 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:2000
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:836
      • C:\Windows\SysWOW64\rundll32.exe
        RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
        3⤵
          PID:640
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3048
        • C:\Windows\SysWOW64\rundll32.exe
          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
          3⤵
            PID:1636
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2864
          • C:\Windows\SysWOW64\rundll32.exe
            RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
            3⤵
              PID:2916
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:1388
            • C:\Windows\SysWOW64\rundll32.exe
              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
              3⤵
                PID:1972
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
              2⤵
                PID:2104
                • C:\Windows\SysWOW64\rundll32.exe
                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                  3⤵
                    PID:2620
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                  2⤵
                    PID:1976
                    • C:\Windows\SysWOW64\rundll32.exe
                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                      3⤵
                        PID:2524
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                      2⤵
                        PID:808
                        • 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:2460
                            • C:\Windows\SysWOW64\rundll32.exe
                              RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                              3⤵
                                PID:2508
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                              2⤵
                                PID:1612
                                • C:\Windows\SysWOW64\rundll32.exe
                                  RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                  3⤵
                                    PID:2380
                                • C:\Windows\SysWOW64\cmd.exe
                                  "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                  2⤵
                                    PID:2956
                                    • C:\Windows\SysWOW64\rundll32.exe
                                      RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                      3⤵
                                        PID:2980
                                    • C:\Windows\SysWOW64\cmd.exe
                                      "C:\Windows\System32\cmd.exe" /k start RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters && exit
                                      2⤵
                                        PID:2336
                                        • C:\Windows\SysWOW64\rundll32.exe
                                          RUNDLL32.EXE user32.dll,UpdatePerUserSystemParameters
                                          3⤵
                                            PID:2492
                                        • 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:2640
                                            • 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:2964
                                                • 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:1568
                                              • 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:1484
                                                  • 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:2712
                                                • 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:2444
                                                    • 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:2156
                                                    • C:\Windows\SysWOW64\icacls.exe
                                                      icacls C:\Windows\System32\wininit.exe /grant "Admin:F"
                                                      3⤵
                                                      • Possible privilege escalation attempt
                                                      • Modifies file permissions
                                                      PID:1728
                                                  • 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:988
                                                      • 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:384
                                                    • 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:1516
                                                        • 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:1668
                                                      • 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:1848
                                                          • 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:1424
                                                        • 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:2196
                                                            • 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:2160
                                                          • 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:1460
                                                              • 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:976
                                                            • 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:568
                                                                • 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:848
                                                              • 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:1328
                                                                  • 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:2476
                                                                  • C:\Windows\SysWOW64\icacls.exe
                                                                    icacls C:\Windows\System32\ntoskrnl.exe /grant "Admin:F"
                                                                    3⤵
                                                                    • Possible privilege escalation attempt
                                                                    • Modifies file permissions
                                                                    PID:2220
                                                                • 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:1168
                                                                    • 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:2084
                                                                    • 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\gm.dls && icacls C:\Windows\System32\drivers\gm.dls /grant "%username%:F" && exit
                                                                    2⤵
                                                                      PID:2732
                                                                      • 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:1640
                                                                      • C:\Windows\SysWOW64\icacls.exe
                                                                        icacls C:\Windows\System32\drivers\gm.dls /grant "Admin:F"
                                                                        3⤵
                                                                        • Possible privilege escalation attempt
                                                                        • Modifies file permissions
                                                                        PID:2984
                                                                    • 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:2856
                                                                        • 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:2108
                                                                        • C:\Windows\SysWOW64\icacls.exe
                                                                          icacls C:\Windows\System32\drivers\gmreadme.txt /grant "Admin:F"
                                                                          3⤵
                                                                          • Possible privilege escalation attempt
                                                                          • Modifies file permissions
                                                                          PID:580
                                                                      • C:\Windows\SysWOW64\cmd.exe
                                                                        "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32\drivers\wimmount.sys && icacls C:\Windows\System32\drivers\wimmount.sys /grant "%username%:F" && exit
                                                                        2⤵
                                                                          PID:2244
                                                                          • C:\Windows\SysWOW64\takeown.exe
                                                                            takeown /f C:\Windows\System32\drivers\wimmount.sys
                                                                            3⤵
                                                                            • Possible privilege escalation attempt
                                                                            • Modifies file permissions
                                                                            • Suspicious use of AdjustPrivilegeToken
                                                                            PID:400
                                                                          • C:\Windows\SysWOW64\icacls.exe
                                                                            icacls C:\Windows\System32\drivers\wimmount.sys /grant "Admin:F"
                                                                            3⤵
                                                                            • Possible privilege escalation attempt
                                                                            • Modifies file permissions
                                                                            PID:2056

                                                                      Network

                                                                      MITRE ATT&CK Enterprise v15

                                                                      Replay Monitor

                                                                      Loading Replay Monitor...

                                                                      Downloads

                                                                      • C:\Users\Admin\Desktop\ÿ¼£≈é•¥ï▀▀φ▐¶Â♀¾εě¾₧♀±╬¶╔±╚×—ž—φ☺╧▐ö«ÂíΣµπ26▄▀√3Â█Ç7◘£▀ε•6œ√₧▄ö¢∞™×Çõ¬▐♣◄õ∩▬—█▼■¥µ☺▬7↑ø34◄☻♠↕1◙∩ń√¾▄

                                                                        Filesize

                                                                        666B

                                                                        MD5

                                                                        9e1e5883c74742a497cf5c272ccd2321

                                                                        SHA1

                                                                        2cf33e34d08b8e17743a60352baffef4b6f02dee

                                                                        SHA256

                                                                        ca687b6a7c3d29b566f3e1988b9f877b51d9a83ee25ffe0755a8dcd3eb5f434a

                                                                        SHA512

                                                                        f2284f0c624cc07a65c16f87865bb98aaa176b1d8b45cd4fbcc1143c9c2297fe6b1d4db55ef054be2bc151c8cc25ff4da7c997b7d38dae3dccd2ffe1c3c01a6b

                                                                      • memory/2000-0-0x0000000001120000-0x000000000117C000-memory.dmp

                                                                        Filesize

                                                                        368KB

                                                                      • memory/2000-1-0x0000000074390000-0x0000000074A7E000-memory.dmp

                                                                        Filesize

                                                                        6.9MB

                                                                      • memory/2000-2-0x0000000004A00000-0x0000000004A40000-memory.dmp

                                                                        Filesize

                                                                        256KB