Analysis

  • max time kernel
    140s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-05-2024 15:38

General

  • Target

    nursultan nexgen fix.exe

  • Size

    1.5MB

  • MD5

    a3d07c747770c9a471a44446e46e33d5

  • SHA1

    8340534fb1770bae9660287ddb0496e243efcfe4

  • SHA256

    16015088c3352a8257f420555e7ce6245aa0e6682deeca79bf7e08c24e1ac3de

  • SHA512

    307cbdddaa9f426f8ceec060c2c0b1ab5ed3573e327dbcfdda7b1dfd22cf17559f017d835d71bdd15397fa95b0c7dfbfb4cd6b51cd5b2adc1d1cddc8ffe27f99

  • SSDEEP

    24576:U2G/nvxW3Ww0tpfnNGcvUCxt9groiK5Cg3ZRvm43TzvmF2cK07:UbA30pfnLRRgrheJROuTzvIR

Malware Config

Signatures

  • DcRat 42 IoCs

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

  • Process spawned unexpected child process 39 IoCs

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

  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 4 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops file in System32 directory 3 IoCs
  • Drops file in Program Files directory 9 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 39 IoCs

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

  • Modifies registry class 3 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 28 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe
    "C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"
    1⤵
    • DcRat
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2648
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:5036
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1344
        • C:\portagentbrowserweb\Containerruntime.exe
          "C:\portagentbrowserweb\Containerruntime.exe"
          4⤵
          • DcRat
          • Checks computer location settings
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4352
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\7CBGAa1d6s.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:2140
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:4416
              • C:\portagentbrowserweb\Containerruntime.exe
                "C:\portagentbrowserweb\Containerruntime.exe"
                6⤵
                • Checks computer location settings
                • Executes dropped EXE
                • Drops file in System32 directory
                • Drops file in Program Files directory
                • Modifies registry class
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:628
                • C:\Windows\System32\cmd.exe
                  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\PNoNLyfwOQ.bat"
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:4904
                  • C:\Windows\system32\w32tm.exe
                    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                    8⤵
                      PID:4208
                    • C:\Program Files\7-Zip\Lang\sihost.exe
                      "C:\Program Files\7-Zip\Lang\sihost.exe"
                      8⤵
                      • Executes dropped EXE
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      PID:60
            • C:\Windows\SysWOW64\reg.exe
              reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
              4⤵
              • Modifies registry key
              PID:1944
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 9 /tr "'C:\portagentbrowserweb\msedge.exe'" /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1348
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "msedge" /sc ONLOGON /tr "'C:\portagentbrowserweb\msedge.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4520
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 5 /tr "'C:\portagentbrowserweb\msedge.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3316
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 8 /tr "'C:\Windows\ServiceProfiles\LocalService\Music\lsass.exe'" /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3600
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\ServiceProfiles\LocalService\Music\lsass.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:892
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Windows\ServiceProfiles\LocalService\Music\lsass.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3184
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 10 /tr "'C:\odt\conhost.exe'" /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:4032
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\odt\conhost.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:392
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 7 /tr "'C:\odt\conhost.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:1288
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\Windows\DigitalLocker\en-US\WmiPrvSE.exe'" /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3356
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\DigitalLocker\en-US\WmiPrvSE.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:3880
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 12 /tr "'C:\Windows\DigitalLocker\en-US\WmiPrvSE.exe'" /rl HIGHEST /f
        1⤵
        • DcRat
        • Process spawned unexpected child process
        • Creates scheduled task(s)
        PID:2152
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1340 --field-trial-handle=2356,i,13261194862334667799,7441241219475888176,262144 --variations-seed-version /prefetch:8
        1⤵
          PID:2428
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 9 /tr "'C:\Windows\System32\fr\msedge.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4072
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedge" /sc ONLOGON /tr "'C:\Windows\System32\fr\msedge.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4052
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 6 /tr "'C:\Windows\System32\fr\msedge.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4108
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4668
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4048
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1656
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Program Files\7-Zip\Lang\sihost.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3700
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\sihost.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2620
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\Program Files\7-Zip\Lang\sihost.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1716
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\Videos\sihost.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1876
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Admin\Videos\sihost.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2516
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\Videos\sihost.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1612
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\portagentbrowserweb\OfficeClickToRun.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:848
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\portagentbrowserweb\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3736
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 5 /tr "'C:\portagentbrowserweb\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1616
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\odt\RuntimeBroker.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4104
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\odt\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2468
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\odt\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2984
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\de\explorer.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1120
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\de\explorer.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3016
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "explorere" /sc MINUTE /mo 11 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\de\explorer.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1020
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\RuntimeBroker.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2716
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1596
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Internet Explorer\fr-FR\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3136
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Photo Viewer\de-DE\msedge.exe'" /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:924
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedge" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\de-DE\msedge.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3164
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "msedgem" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Photo Viewer\de-DE\msedge.exe'" /rl HIGHEST /f
          1⤵
          • DcRat
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3624

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          1KB

          MD5

          7800fca2323a4130444c572374a030f4

          SHA1

          40c9b8e0e5e7d72a5293f4010f2ccf21e637b4aa

          SHA256

          29f5645ac14353ac460858f52c856548f3aeb144b09eef672a6b4849bafe742e

          SHA512

          c8a7ad930b8c07007c7a67d8c32a2a4a401dcc34ab966e0e80901655fcbe1f5c95b72a195e6381b1de56c2c987eeab093d8e89891bec9e9684785c5d824b3554

        • C:\Users\Admin\AppData\Local\Temp\7CBGAa1d6s.bat
          Filesize

          208B

          MD5

          8d84c00a586d122e3a57f64fdfca1cd4

          SHA1

          0272edc8d1d6dca09ef12aefa42235552e6fdbe1

          SHA256

          8cb76e7d41327f1cd61f3dd1ed9bef092025f1510144bad4b1aaacc468c440ff

          SHA512

          5dbd5387d6a781baf5869a51048ab5636c025c23fd9abbc31e1779f287f20f019433d319b3907661f19b7e13372b56f887d9db9ae127bef7014b570ed054a08c

        • C:\Users\Admin\AppData\Local\Temp\PNoNLyfwOQ.bat
          Filesize

          203B

          MD5

          e7acb2981cea02de237ad1da90164633

          SHA1

          e1d5df78a91db50351f8dacdbaadd0a0c259e244

          SHA256

          e8e365f17c0b42d97064dfbab9a85a8d714a5291837884d03d786e293c87418b

          SHA512

          d77701b1c69a5876bcf631eca050fecb10a1350407b0c7d5a56e5ce3db794ab28b22c28161ab4c9eceb8be8bdf1c1fc2370859d707a2508e81d4edef64326885

        • C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat
          Filesize

          157B

          MD5

          c8f8a078dace2ff4cb106803c9199643

          SHA1

          a5029ff4c4f0f24b0fbe2951c9a8002501ebd3b5

          SHA256

          1b99d39fa273f33b072c67e0df7d33b1699fa17b7c7139467a658302a5ed0e0d

          SHA512

          efaea3b4653768bbd135a0ec55319df2464f1d440ad982f31a5eff05c5ba5032f4718683ff6419c668bf1f34a117b5a101f56d1efc1d74ad93e692c52686f999

        • C:\portagentbrowserweb\Containerruntime.exe
          Filesize

          1.2MB

          MD5

          5887a563351ca99247b7e2c448bd9f2e

          SHA1

          b24695e88143863297535989900bb7521ea86d67

          SHA256

          e74cbd74c838db604926e27322342c02f803b95f98680d4089b5c01ed93fb390

          SHA512

          b7d82bd09ba64891b75bbb9356de74a1ed0835709a391698c1301825777418f57e4f2ae3c260d3f7b6ada05d0e7ddeb4a6b75901fdf53bdd82ffa2febb685107

        • C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe
          Filesize

          220B

          MD5

          61a07f2f9e8e9b1f5175b2d60c3e3f18

          SHA1

          e695b0c2b43c786453bf3f6ae504f0626951d281

          SHA256

          5c75708ec9e4fe419a2fd1067bd5793bacb28140177cc6b36300fbf28e7c23d1

          SHA512

          8ef3529f6bf504224e7803019f1e162aead7961bc1a5115f50fb5f580570e8b04707da21a7aab4eb7f1554a3b5333597fb3335e5f6a74dabfdb0583eecb35b5d

        • memory/4352-12-0x00007FFFA4653000-0x00007FFFA4655000-memory.dmp
          Filesize

          8KB

        • memory/4352-13-0x0000000000B20000-0x0000000000C52000-memory.dmp
          Filesize

          1.2MB

        • memory/4352-14-0x0000000002D80000-0x0000000002D9C000-memory.dmp
          Filesize

          112KB

        • memory/4352-15-0x000000001BF40000-0x000000001BF90000-memory.dmp
          Filesize

          320KB

        • memory/4352-16-0x000000001B880000-0x000000001B896000-memory.dmp
          Filesize

          88KB

        • memory/4352-17-0x000000001BDB0000-0x000000001BDBC000-memory.dmp
          Filesize

          48KB