Resubmissions

25-01-2022 20:58

220125-zr9txafah2 10

25-01-2022 05:22

220125-f2kszshddn 10

Analysis

  • max time kernel
    118s
  • max time network
    128s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    25-01-2022 05:22

General

  • Target

    b5320340037751e10748b6463fab8ee0.exe

  • Size

    2.1MB

  • MD5

    b5320340037751e10748b6463fab8ee0

  • SHA1

    b3e9a125688e9da67708adfcada41bb56de2cd3d

  • SHA256

    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

  • SHA512

    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

Malware Config

Signatures

  • DcRat 6 IoCs

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Process spawned unexpected child process 4 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • suricata: ET MALWARE DCRAT Activity (GET)

    suricata: ET MALWARE DCRAT Activity (GET)

  • Executes dropped EXE 1 IoCs
  • Deletes itself 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Drops file in System32 directory 5 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 4 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b5320340037751e10748b6463fab8ee0.exe
    "C:\Users\Admin\AppData\Local\Temp\b5320340037751e10748b6463fab8ee0.exe"
    1⤵
    • DcRat
    • Adds Run key to start application
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:736
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\b5320340037751e10748b6463fab8ee0.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1420
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Documents and Settings\dllhost.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1900
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\wlansvc\RuntimeBroker.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4012
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\debug\SearchUI.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:776
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\System32\KBDINBEN\spoolsv.exe'
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3952
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QUvcrzcpRj.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:772
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2104
        • C:\Windows\System32\KBDINBEN\spoolsv.exe
          "C:\Windows\System32\KBDINBEN\spoolsv.exe"
          3⤵
          • Modifies WinLogon for persistence
          • Executes dropped EXE
          • Deletes itself
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3196
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks" /Delete /tn "b5320340037751e10748b6463fab8ee0" /f
            4⤵
              PID:1684
            • C:\Windows\SYSTEM32\schtasks.exe
              "schtasks" /Delete /tn "spoolsv" /f
              4⤵
                PID:3544
              • C:\Windows\SYSTEM32\schtasks.exe
                "schtasks" /Delete /tn "SearchUI" /f
                4⤵
                  PID:3604
                • C:\Windows\SYSTEM32\schtasks.exe
                  "schtasks" /Delete /tn "RuntimeBroker" /f
                  4⤵
                    PID:684
                  • C:\Windows\SYSTEM32\schtasks.exe
                    "schtasks" /Delete /tn "dllhost" /f
                    4⤵
                      PID:3952
                    • C:\Windows\SYSTEM32\schtasks.exe
                      "schtasks" /Delete /tn "spoolsv" /f
                      4⤵
                        PID:1216
                      • C:\Windows\system32\cmd.exe
                        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\8qIUyQJ4qD.bat" "
                        4⤵
                        • Suspicious use of WriteProcessMemory
                        PID:2600
                        • C:\Windows\system32\w32tm.exe
                          w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                          5⤵
                            PID:4024
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\KBDINBEN\spoolsv.exe'" /rl HIGHEST /f
                    1⤵
                    • DcRat
                    • Process spawned unexpected child process
                    • Creates scheduled task(s)
                    PID:4028
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "SearchUI" /sc ONLOGON /tr "'C:\Windows\debug\SearchUI.exe'" /rl HIGHEST /f
                    1⤵
                    • DcRat
                    • Process spawned unexpected child process
                    • Creates scheduled task(s)
                    PID:2828
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\wlansvc\RuntimeBroker.exe'" /rl HIGHEST /f
                    1⤵
                    • DcRat
                    • Process spawned unexpected child process
                    • Creates scheduled task(s)
                    PID:1536
                  • C:\Windows\system32\schtasks.exe
                    schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Documents and Settings\dllhost.exe'" /rl HIGHEST /f
                    1⤵
                    • DcRat
                    • Process spawned unexpected child process
                    • Creates scheduled task(s)
                    PID:924

                  Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  • C:\Documents and Settings\5940a34987c991

                    MD5

                    0c6b6656f152f4176ccfc4a6b2d1b294

                    SHA1

                    518b488ccf8ffd2889e1c03f93cc9673b5d333fe

                    SHA256

                    72381714ca3c565e39e6d5a27ff99ac6de563d2a74127e44ff4b9efbf78e18cf

                    SHA512

                    21a80b0e44572d1bef9aec1acbe01f8b19880f82bd9c8e001fd267e2b20b76dd3e0a72c1b9586cd65a8f561e74c73c2a0eaa02eab1d58010ecebb232bb85bd39

                  • C:\Documents and Settings\dllhost.exe

                    MD5

                    b5320340037751e10748b6463fab8ee0

                    SHA1

                    b3e9a125688e9da67708adfcada41bb56de2cd3d

                    SHA256

                    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

                    SHA512

                    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

                  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

                    MD5

                    ad5cd538ca58cb28ede39c108acb5785

                    SHA1

                    1ae910026f3dbe90ed025e9e96ead2b5399be877

                    SHA256

                    c9e6cb04d6c893458d5a7e12eb575cf97c3172f5e312b1f63a667cbbc5f0c033

                    SHA512

                    c066c5d9b276a68fa636647bb29aea05bfa2292217bc77f5324d9c1d93117772ee8277e1f7cff91ec8d6b7c05ca078f929cecfdbb09582522a9067f54740af13

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

                    MD5

                    0e27558b9c2f6dfa57d200cbdbc2b3be

                    SHA1

                    85f2eb3dec92dab93049d200879fc861cdfda0c4

                    SHA256

                    621632615c2b99953b5c43d54eb54cf9e0a918904eead0119f61c631ee4b90a1

                    SHA512

                    9ef05488940620d6b5f15f25cab66ef87aa19591feef902f5d9c297e98d1a723bfa5fc05f81ce24ff0e9e992cacda806960eed368660046f77ba843147efbe5d

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

                    MD5

                    453fed4e93ccc2ff5ffad30f81dfc51f

                    SHA1

                    011724099040a0fb24baa1c886fd0be86d5c9ece

                    SHA256

                    fdf8e39f343262aae561094a192cb22085dfc980a65b6b357dbd2e9fd8d793e5

                    SHA512

                    fe8fd619850e407c2d8459469c662ccc9329e4f78a19e1c114f877b75f912786a278b3565a9b1b61e305a25ea90cadba6a8695c6e949aaa5ee49eb5056706b5b

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

                    MD5

                    fd2133a9897459eda2a03bbd12520b03

                    SHA1

                    169631a04053293098ceebbcc1b21706087308d2

                    SHA256

                    02d176fabd70345cec2d189f4c8015b9fde165623ae8e30388fba3a08ad5eeea

                    SHA512

                    efd0d9ae3d8577b04727391a9f5ffcd2ab93b60ac608bdef33740293b78a7ff93a25ca1fe574740c26312a3e740345ee3732226f1fd2d01b02e30ed12e89aac1

                  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

                    MD5

                    fd2133a9897459eda2a03bbd12520b03

                    SHA1

                    169631a04053293098ceebbcc1b21706087308d2

                    SHA256

                    02d176fabd70345cec2d189f4c8015b9fde165623ae8e30388fba3a08ad5eeea

                    SHA512

                    efd0d9ae3d8577b04727391a9f5ffcd2ab93b60ac608bdef33740293b78a7ff93a25ca1fe574740c26312a3e740345ee3732226f1fd2d01b02e30ed12e89aac1

                  • C:\Users\Admin\AppData\Local\Temp\8qIUyQJ4qD.bat

                    MD5

                    9e82c8236a781d00b13dd47d5c3d20a5

                    SHA1

                    fb8a4f2cbe662c625128f472eb6f50ff954e3629

                    SHA256

                    c9422f9e15921eb73d32a25f7ac91d3f8667cc99857333c105994d8e41f72c79

                    SHA512

                    a1620da4199be79735aab9e188cec6ee3ecac52f20ad6ac2d8de5a89e1a0cb59bc517e4fb2487de4391a7aa09e8a1cd5ab263cea80200e82c5b7fad16dc1e57a

                  • C:\Users\Admin\AppData\Local\Temp\QUvcrzcpRj.bat

                    MD5

                    a891b45369c144c256c253a2deffedce

                    SHA1

                    37cdb1c413f9abb73efd26f75bb19037631925fb

                    SHA256

                    c7dde14e252358758da96eb76da4e591a45f98fa716b604781426bae176b9edb

                    SHA512

                    831467c23fb0d24308e1ee6af0394c47e162babe3509fae3f65b9887c2c8d6b41445f404df22d09a9073dfcb98b4513b0e914c371bea4a50c7beef2bd30d5202

                  • C:\Windows\System32\KBDINBEN\f3b6ecef712a24

                    MD5

                    38050da1be3921932f54e893ec825e38

                    SHA1

                    6ad15488d4270266d475aa1a341671f329098fc7

                    SHA256

                    ee7a4f276f433cb8b8df58de3941914669bdece1607110d9e593e1b362fa188a

                    SHA512

                    5b85e9db62ff4a246f8977acd4c78321e8bf1ba17e0341b6e368e74cec6d9b206b0110f5e66f93fc7dcd84ec5c3abf6969d3cf1c697619b30e85cadad2a0480e

                  • C:\Windows\System32\KBDINBEN\spoolsv.exe

                    MD5

                    b5320340037751e10748b6463fab8ee0

                    SHA1

                    b3e9a125688e9da67708adfcada41bb56de2cd3d

                    SHA256

                    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

                    SHA512

                    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

                  • C:\Windows\System32\KBDINBEN\spoolsv.exe

                    MD5

                    b5320340037751e10748b6463fab8ee0

                    SHA1

                    b3e9a125688e9da67708adfcada41bb56de2cd3d

                    SHA256

                    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

                    SHA512

                    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

                  • C:\Windows\System32\wlansvc\9e8d7a4ca61bd9

                    MD5

                    940bd7222e9786f2028fbf2c9a48ed5c

                    SHA1

                    750680cb8c53e65cc6c2f598eb2f078d88ac4ebb

                    SHA256

                    6c9087ee42b4de6dbb044f72950d1f7707847c785927bf56fa5760bbd31c4d27

                    SHA512

                    398aa13fb26273fc423a501e93d1d34bb6be5ce17eec7959050bcac7b6f4272d315e8462df82150ff5a430bf309588ee2aca8a4e4acb4f164d9ffa071b1bc4bf

                  • C:\Windows\System32\wlansvc\RuntimeBroker.exe

                    MD5

                    b5320340037751e10748b6463fab8ee0

                    SHA1

                    b3e9a125688e9da67708adfcada41bb56de2cd3d

                    SHA256

                    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

                    SHA512

                    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

                  • C:\Windows\debug\SearchUI.exe

                    MD5

                    b5320340037751e10748b6463fab8ee0

                    SHA1

                    b3e9a125688e9da67708adfcada41bb56de2cd3d

                    SHA256

                    b45b4ee4146fc230dc6ea93a1af252314acc9b4adab82f36103e8f782589983d

                    SHA512

                    67e3bdc6c8db9ed127dc0a7a0fcb431a7294fd8daf77fe6ce4042a3cb63b9576130f1d3b3aee665dc16c1de4ede96ed7976789e63a4d61178c631d3d76e06138

                  • C:\Windows\debug\dab4d89cac03ec

                    MD5

                    416e449d541fda8af2dcd8156014c6df

                    SHA1

                    fda99cfade877b533d9ee33fd0243bb20c1c5e44

                    SHA256

                    54aad54b965be7c246bbb5b10c9d64f5de5675812c2078870d7c07953542cffe

                    SHA512

                    8dc49edbf31e5b8b63e5a77d067af85d1507b45c567eeb52c21758364dc08e53db67ddf0f02e7fa3548a7991c398bdbd3bc6db85079b49f84a6b2a101f2972b5

                  • memory/736-115-0x0000000000730000-0x000000000095C000-memory.dmp

                    Filesize

                    2.2MB

                  • memory/736-124-0x0000000001200000-0x000000000120A000-memory.dmp

                    Filesize

                    40KB

                  • memory/736-123-0x0000000001210000-0x000000000121C000-memory.dmp

                    Filesize

                    48KB

                  • memory/736-122-0x00000000010C0000-0x00000000010CC000-memory.dmp

                    Filesize

                    48KB

                  • memory/736-121-0x000000001C3C0000-0x000000001C8E6000-memory.dmp

                    Filesize

                    5.1MB

                  • memory/736-120-0x00000000010B0000-0x00000000010C2000-memory.dmp

                    Filesize

                    72KB

                  • memory/736-119-0x00000000010A0000-0x00000000010A8000-memory.dmp

                    Filesize

                    32KB

                  • memory/736-118-0x0000000001090000-0x000000000109A000-memory.dmp

                    Filesize

                    40KB

                  • memory/736-117-0x000000001B880000-0x000000001B882000-memory.dmp

                    Filesize

                    8KB

                  • memory/736-116-0x0000000001040000-0x0000000001096000-memory.dmp

                    Filesize

                    344KB

                  • memory/776-158-0x00000250F5900000-0x00000250F5902000-memory.dmp

                    Filesize

                    8KB

                  • memory/776-205-0x00000250F5906000-0x00000250F5908000-memory.dmp

                    Filesize

                    8KB

                  • memory/776-159-0x00000250F5903000-0x00000250F5905000-memory.dmp

                    Filesize

                    8KB

                  • memory/1420-201-0x000001D63E346000-0x000001D63E348000-memory.dmp

                    Filesize

                    8KB

                  • memory/1420-152-0x000001D63E343000-0x000001D63E345000-memory.dmp

                    Filesize

                    8KB

                  • memory/1420-142-0x000001D63E340000-0x000001D63E342000-memory.dmp

                    Filesize

                    8KB

                  • memory/1900-199-0x00000173F8A56000-0x00000173F8A58000-memory.dmp

                    Filesize

                    8KB

                  • memory/1900-156-0x00000173F8A53000-0x00000173F8A55000-memory.dmp

                    Filesize

                    8KB

                  • memory/1900-155-0x00000173F8A50000-0x00000173F8A52000-memory.dmp

                    Filesize

                    8KB

                  • memory/3196-329-0x000000001B040000-0x000000001B042000-memory.dmp

                    Filesize

                    8KB

                  • memory/3196-330-0x000000001BCE0000-0x000000001BEA2000-memory.dmp

                    Filesize

                    1.8MB

                  • memory/3952-145-0x0000022DFBA00000-0x0000022DFBA02000-memory.dmp

                    Filesize

                    8KB

                  • memory/3952-203-0x0000022DFBA06000-0x0000022DFBA08000-memory.dmp

                    Filesize

                    8KB

                  • memory/3952-160-0x0000022DFB9C0000-0x0000022DFB9E2000-memory.dmp

                    Filesize

                    136KB

                  • memory/3952-154-0x0000022DFBA03000-0x0000022DFBA05000-memory.dmp

                    Filesize

                    8KB

                  • memory/4012-200-0x0000026FDD636000-0x0000026FDD638000-memory.dmp

                    Filesize

                    8KB

                  • memory/4012-165-0x0000026FF7A10000-0x0000026FF7A86000-memory.dmp

                    Filesize

                    472KB

                  • memory/4012-157-0x0000026FDD633000-0x0000026FDD635000-memory.dmp

                    Filesize

                    8KB

                  • memory/4012-150-0x0000026FDD630000-0x0000026FDD632000-memory.dmp

                    Filesize

                    8KB