Analysis

  • max time kernel
    148s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26-01-2023 14:36

General

  • Target

    c2705b8b9562a559b785e347ead070c4.exe

  • Size

    1.5MB

  • MD5

    c2705b8b9562a559b785e347ead070c4

  • SHA1

    74e5efad74eeb3e80c689c2f2fa4c8e19d55b94a

  • SHA256

    87ade58bfd0c4657778eccf90ffb4409c61012dcd2134c708bebe60a872599b5

  • SHA512

    28764caefea9a2e23e5793c9118f5f7926d9e1d507f237f004a16fb81dfbfddd4c33c11843ef6eb9fa655d85443b032b878a88cc7cb9c379292e8813012bb83e

  • SSDEEP

    24576:Y2kx1r2DVrfP/LtFYnnq4xuO1N/EZbUtJSU5KlyR5:YV0V3RFh4g2N/EZ4B5KlyR

Malware Config

Signatures

  • DcRat

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

  • Process spawned unexpected child process 30 IoCs

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

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

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

  • Drops file in Program Files directory 10 IoCs
  • Drops file in Windows directory 3 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 30 IoCs

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

  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 17 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c2705b8b9562a559b785e347ead070c4.exe
    "C:\Users\Admin\AppData\Local\Temp\c2705b8b9562a559b785e347ead070c4.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Program Files directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4224
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\mVhHsYW9nd.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3272
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2376
        • C:\Users\Admin\AppData\Local\Temp\c2705b8b9562a559b785e347ead070c4.exe
          "C:\Users\Admin\AppData\Local\Temp\c2705b8b9562a559b785e347ead070c4.exe"
          3⤵
          • Checks computer location settings
          • Drops file in Program Files directory
          • Drops file in Windows directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3844
          • C:\Windows\Performance\OfficeClickToRun.exe
            "C:\Windows\Performance\OfficeClickToRun.exe"
            4⤵
            • Executes dropped EXE
            • Checks computer location settings
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious behavior: GetForegroundWindowSpam
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:780
            • C:\Windows\System32\WScript.exe
              "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\62149172-9eb1-4a51-ab16-c97aa326e089.vbs"
              5⤵
                PID:824
              • C:\Windows\System32\WScript.exe
                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\1c1c408c-d976-4d56-8555-eaa60b9fab6f.vbs"
                5⤵
                  PID:3204
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "c2705b8b9562a559b785e347ead070c4c" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\c2705b8b9562a559b785e347ead070c4.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1364
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "c2705b8b9562a559b785e347ead070c4" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\c2705b8b9562a559b785e347ead070c4.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1716
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "c2705b8b9562a559b785e347ead070c4c" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\c2705b8b9562a559b785e347ead070c4.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:5112
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Idle.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4156
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Idle.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4120
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\Idle.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2032
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\Windows\Performance\OfficeClickToRun.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:344
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\Performance\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1620
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 10 /tr "'C:\Windows\Performance\OfficeClickToRun.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3752
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Program Files\Internet Explorer\de-DE\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3484
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\de-DE\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2984
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Internet Explorer\de-DE\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2444
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\fontdrvhost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2400
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\fontdrvhost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2484
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows NT\TableTextService\en-US\fontdrvhost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4296
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 8 /tr "'C:\Program Files\Mozilla Firefox\winlogon.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4264
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\winlogon.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4532
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\Program Files\Mozilla Firefox\winlogon.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4512
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Portable Devices\StartMenuExperienceHost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:3412
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\StartMenuExperienceHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:460
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Portable Devices\StartMenuExperienceHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:728
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Users\Default\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4364
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Default\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1244
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Users\Default\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:2360
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4464
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1176
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\sihost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:1308
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\odt\dllhost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:788
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\odt\dllhost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:652
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\odt\dllhost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Creates scheduled task(s)
          PID:4448

        Network

        MITRE ATT&CK Matrix ATT&CK v6

        Execution

        Scheduled Task

        1
        T1053

        Persistence

        Scheduled Task

        1
        T1053

        Privilege Escalation

        Scheduled Task

        1
        T1053

        Credential Access

        Credentials in Files

        1
        T1081

        Discovery

        Query Registry

        1
        T1012

        System Information Discovery

        2
        T1082

        Collection

        Data from Local System

        1
        T1005

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\c2705b8b9562a559b785e347ead070c4.exe.log
          Filesize

          1KB

          MD5

          bbb951a34b516b66451218a3ec3b0ae1

          SHA1

          7393835a2476ae655916e0a9687eeaba3ee876e9

          SHA256

          eb70c64ae99d14ac2588b7a84854fbf3c420532d7fe4dfd49c7b5a70c869943a

          SHA512

          63bcbfcf8e7421c66855c487c31b2991a989bdea0c1edd4c40066b52fa3eb3d9d37db1cd21b8eb4f33dd5870cc20532c8f485eab9c0b4f6b0793a35c077f2d6f

        • C:\Users\Admin\AppData\Local\Temp\1c1c408c-d976-4d56-8555-eaa60b9fab6f.vbs
          Filesize

          495B

          MD5

          e1f12fcaefd1f207a1dc657feeef458a

          SHA1

          f29535c6288af8b939783786b1902a1b8f86f106

          SHA256

          aaf361890c885f5bc6756ba14cada49760d05909a2a53ce613e93d26c2e4de8f

          SHA512

          5f196c940d2669f532d36593826298b69d3842ec297c4ea2954195a25aa5ff05d1d2b5476b1c693d8f3d932af4cde5532f02c70a39865e295c73204586468abf

        • C:\Users\Admin\AppData\Local\Temp\62149172-9eb1-4a51-ab16-c97aa326e089.vbs
          Filesize

          718B

          MD5

          2ca7fe0d00c8de573b90eb841690499d

          SHA1

          49016560b92a30025c0077f5ad86c7d2896d6235

          SHA256

          59b14f18e8da705bcc13f3a670eb9b4a418cb7cca7dbbb6a7d624ca46ee5603b

          SHA512

          349b90c95d34a7cd1842dda2c6c4af7c160a43efc3bf0a98e2e3da0b60797f7a80ad34808d6cb672967a82fefa0e607f6f62d286f3191deb4df39b4c7468e758

        • C:\Users\Admin\AppData\Local\Temp\mVhHsYW9nd.bat
          Filesize

          235B

          MD5

          e8d80942ca230a6d88508a6e2840374c

          SHA1

          dca0d3cf322560dc87d0d78aab76fa8f380650fb

          SHA256

          8a7827f8e55605353a160af9ef00d0bb919d13b11238fe8e858415e2b92ab72b

          SHA512

          af06066649b4b3b2ad614d7c76d8df277d2c2a2d1d8c2e0fd0d18182f3dcae22ce1a08184fe3b4012e0be7bc71554f70573624c1bfbf69c27abd2ebd312dc40c

        • C:\Windows\Performance\OfficeClickToRun.exe
          Filesize

          1.5MB

          MD5

          c2705b8b9562a559b785e347ead070c4

          SHA1

          74e5efad74eeb3e80c689c2f2fa4c8e19d55b94a

          SHA256

          87ade58bfd0c4657778eccf90ffb4409c61012dcd2134c708bebe60a872599b5

          SHA512

          28764caefea9a2e23e5793c9118f5f7926d9e1d507f237f004a16fb81dfbfddd4c33c11843ef6eb9fa655d85443b032b878a88cc7cb9c379292e8813012bb83e

        • C:\Windows\Performance\OfficeClickToRun.exe
          Filesize

          1.5MB

          MD5

          c2705b8b9562a559b785e347ead070c4

          SHA1

          74e5efad74eeb3e80c689c2f2fa4c8e19d55b94a

          SHA256

          87ade58bfd0c4657778eccf90ffb4409c61012dcd2134c708bebe60a872599b5

          SHA512

          28764caefea9a2e23e5793c9118f5f7926d9e1d507f237f004a16fb81dfbfddd4c33c11843ef6eb9fa655d85443b032b878a88cc7cb9c379292e8813012bb83e

        • memory/780-147-0x00007FF8B3CB0000-0x00007FF8B4771000-memory.dmp
          Filesize

          10.8MB

        • memory/780-152-0x00007FF8B3CB0000-0x00007FF8B4771000-memory.dmp
          Filesize

          10.8MB

        • memory/780-143-0x0000000000000000-mapping.dmp
        • memory/824-148-0x0000000000000000-mapping.dmp
        • memory/2376-138-0x0000000000000000-mapping.dmp
        • memory/3204-149-0x0000000000000000-mapping.dmp
        • memory/3272-136-0x0000000000000000-mapping.dmp
        • memory/3844-142-0x00007FF8B3CB0000-0x00007FF8B4771000-memory.dmp
          Filesize

          10.8MB

        • memory/3844-146-0x00007FF8B3CB0000-0x00007FF8B4771000-memory.dmp
          Filesize

          10.8MB

        • memory/3844-140-0x0000000000000000-mapping.dmp
        • memory/4224-132-0x0000000000890000-0x0000000000A1C000-memory.dmp
          Filesize

          1.5MB

        • memory/4224-135-0x000000001CF30000-0x000000001D458000-memory.dmp
          Filesize

          5.2MB

        • memory/4224-139-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp
          Filesize

          10.8MB

        • memory/4224-134-0x00007FF8B3D60000-0x00007FF8B4821000-memory.dmp
          Filesize

          10.8MB

        • memory/4224-133-0x000000001C7A0000-0x000000001C7F0000-memory.dmp
          Filesize

          320KB