Overview

overview

10

Static

static

3

SolaraBoot...er.exe

windows10-ltsc 2021-x64

10

SolaraBoot...er.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    41s
  • max time network
    58s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241023-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    11-11-2024 11:54

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General

  • Target

    SolaraBootstrapper.exe

  • Size

    2.1MB

  • MD5

    46ee914172c6a86f6545e8afdcbddb60

  • SHA1

    1e40ed9b6d1f8f24b9692c4b600a04a0fabac121

  • SHA256

    c2fc34d4e0c21d93bb27de86004031c5d6a7aa359f3b9c511d6a771df9d8bec0

  • SHA512

    55025faa2d309fc959d07573273559ea3007d8bcf4242417d81965678638ee27a3465be96ce21ee3398edc84dc2d385237a8a1845d037802ddab4be8421f28dd

  • SSDEEP

    24576:lTbBv5rUfSyHO85Zn6VSnaS/6fRkJ9v82URnpQKm+9nHjLJAWCNGQj1EHzpp4o5R:PBZ076i7v8ZjQ6PJAWCNFp0zpphFaF4

Score
10/10
dcratdiscoveryinfostealerpersistencerat

Malware Config

Signatures

  • DcRat

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

    ratinfostealerdcrat
  • Dcrat family
    dcrat
  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
    persistence
  • Process spawned unexpected child process 18 IoCs

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

  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Adds Run key to start application 2 TTPs 12 IoCs
    persistence
  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

    discovery
  • Modifies registry class 2 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

    persistenceexecution
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe
    "C:\Users\Admin\AppData\Local\Temp\SolaraBootstrapper.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3092
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Bridgechainsurrogateagentbrowser\R4bQkR26AwLGB.vbe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3220
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Bridgechainsurrogateagentbrowser\2z7j8ywMSttrtokDo1GfN5BjEwI0VbLwwreu6qvZV73bjR7gSvf.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2876
        • C:\Bridgechainsurrogateagentbrowser\surrogateWeb.exe
          "C:\Bridgechainsurrogateagentbrowser/surrogateWeb.exe"
          4⤵
          • Modifies WinLogon for persistence
          • Checks computer location settings
          • Executes dropped EXE
          • Adds Run key to start application
          • Drops file in Windows directory
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4052
          • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
            "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\ggnm1atc\ggnm1atc.cmdline"
            5⤵
            • Drops file in System32 directory
            • Suspicious use of WriteProcessMemory
            PID:2852
            • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
              C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES3A.tmp" "c:\Windows\System32\CSC32FD38885DE54877A42561DD7E49BD97.TMP"
              6⤵
                PID:4780
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\75dGylr3XV.bat"
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:3724
              • C:\Windows\system32\chcp.com
                chcp 65001
                6⤵
                  PID:2184
                • C:\Windows\system32\PING.EXE
                  ping -n 10 localhost
                  6⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:1540
                • C:\Windows\Provisioning\Autopilot\upfc.exe
                  "C:\Windows\Provisioning\Autopilot\upfc.exe"
                  6⤵
                  • Executes dropped EXE
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2452
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\SystemTemp\Crashpad\attachments\RuntimeBroker.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1020
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\SystemTemp\Crashpad\attachments\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3768
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\SystemTemp\Crashpad\attachments\RuntimeBroker.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2284
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Windows\Provisioning\Autopilot\upfc.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2932
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Windows\Provisioning\Autopilot\upfc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2732
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 6 /tr "'C:\Windows\Provisioning\Autopilot\upfc.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1044
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 7 /tr "'C:\Windows\Cursors\conhost.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2428
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\Cursors\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:468
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 11 /tr "'C:\Windows\Cursors\conhost.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:748
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 5 /tr "'C:\Bridgechainsurrogateagentbrowser\unsecapp.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:4864
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\Bridgechainsurrogateagentbrowser\unsecapp.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3736
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "unsecappu" /sc MINUTE /mo 10 /tr "'C:\Bridgechainsurrogateagentbrowser\unsecapp.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:4056
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:3088
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2640
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:472
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "surrogateWebs" /sc MINUTE /mo 14 /tr "'C:\Bridgechainsurrogateagentbrowser\surrogateWeb.exe'" /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:2528
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "surrogateWeb" /sc ONLOGON /tr "'C:\Bridgechainsurrogateagentbrowser\surrogateWeb.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1320
      • C:\Windows\system32\schtasks.exe
        schtasks.exe /create /tn "surrogateWebs" /sc MINUTE /mo 10 /tr "'C:\Bridgechainsurrogateagentbrowser\surrogateWeb.exe'" /rl HIGHEST /f
        1⤵
        • Process spawned unexpected child process
        • Scheduled Task/Job: Scheduled Task
        PID:1464

      Network

      MITRE ATT&CK Enterprise v15

      Reconnaissance

      Resource Development

      Initial Access

      Execution

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      Persistence

      Boot or Logon Autostart Execution

      2
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Winlogon Helper DLL

      1
      T1547.004

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      Privilege Escalation

      Boot or Logon Autostart Execution

      2
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Winlogon Helper DLL

      1
      T1547.004

      Scheduled Task/Job

      1
      T1053

      Scheduled Task

      1
      T1053.005

      Defense Evasion

      Modify Registry

      2
      T1112

      Credential Access

      Discovery

      Query Registry

      2
      T1012

      Remote System Discovery

      1
      T1018

      System Information Discovery

      2
      T1082

      System Location Discovery

      1
      T1614

      System Language Discovery

      1
      T1614.001

      System Network Configuration Discovery

      1
      T1016

      Internet Connection Discovery

      1
      T1016.001

      Lateral Movement

      Collection

      Command and Control

      Exfiltration

      Impact

      Replay Monitor

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      Downloads

      • C:\Bridgechainsurrogateagentbrowser\2z7j8ywMSttrtokDo1GfN5BjEwI0VbLwwreu6qvZV73bjR7gSvf.bat
        Filesize

        92B

        MD5

        ad11ef1a91a55fc9a09e2840055b0258

        SHA1

        3f589bc2aae7340214c485d95d53707fb17b0ee1

        SHA256

        01aa37908591454f6b5e625aa85b11c6974c9b626a807b5891c122ac3457ad91

        SHA512

        e67730a318efb93b6f89aab6d3db48486837d3a94a8126f70de1431f34e0be9a931725f43de9afbaf85222f37ec306cdc2b00764f954155e034316fdf791f9c5

        Download Submit

      • C:\Bridgechainsurrogateagentbrowser\R4bQkR26AwLGB.vbe
        Filesize

        262B

        MD5

        2bcf9ddfda6a272a00e0b9722d626289

        SHA1

        2ac291e1a6a29a8e5a44af1af399a4aa3614369a

        SHA256

        038b7a454b7ae1feb6ebae9c44e24ff85fb0c6aed3a9087e9c624a1dc90986f6

        SHA512

        7ad1af0b1bc0582859b86a9409baa0c31e60b2c94083dd44bf6f7fda92b5ff529b688fb1fa0e09e0e095b5352475ce533cdd32dfd578711587a4aade93fb6193

        Download Submit

      • C:\Bridgechainsurrogateagentbrowser\surrogateWeb.exe
        Filesize

        1.8MB

        MD5

        3723476203e1b4cbe80798f841591b12

        SHA1

        2202dbf0c1b219d1dc628e28b358850d8653e921

        SHA256

        7084cb8a428b34e2dc5f6301fd0d76f87292376545f9976cf1da56f45170984b

        SHA512

        69a220f8d3e77c47625dd6de863cd6e27f4b0650c8e395d5cecbd067e67be441bdbda0419a70a107ed08afa553c31e91c4e80ae7b07a197fe06978c4565915b6

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\75dGylr3XV.bat
        Filesize

        170B

        MD5

        edbe6e3e5cc7a62066e6866164c44bc2

        SHA1

        519bb7c324936c96f02f5197445ca39698fcaaa8

        SHA256

        b7e86b9632bfc04eda0edba09c16db8473be21d5c97a4c9064255278bae4eedd

        SHA512

        8e40886bba3d0366e48935ab76187a95d0001f9dbba21898a199fec62722df0b914f62a6fc430fe7d8e252149a9e1d0bb376ff4a3e6b2757949138a5a975ed04

        Download Submit

      • C:\Users\Admin\AppData\Local\Temp\RES3A.tmp
        Filesize

        1KB

        MD5

        5870372da04059e7c84c5274c7d82c33

        SHA1

        c44474781800461bbab9ab58c7c13345852e9177

        SHA256

        4b292043e032127601103a2e50cd7e5548956499f57cfe7e5213cec4d3635585

        SHA512

        6375fcd4ee5b0ce56a5c7e9278a38883fa3c6d18e88a69f8f60f317810e01e2aa2f24cd10490317f361962044c07eb6c8a59c6cd72dd811371dd29cdf08a1d22

        Download Submit

      • \??\c:\Users\Admin\AppData\Local\Temp\ggnm1atc\ggnm1atc.0.cs
        Filesize

        392B

        MD5

        54c4bf2494e1559643ad018e7e2477e8

        SHA1

        8b295ff41d3563f1a112e7a01f65fe5a051bc162

        SHA256

        32a6921c99434435290fbaf52833b90d7d17db9ef609e4019860c4cb12c11d54

        SHA512

        2642520a82329b83f8cf9e8fecd235a9813702fa4cbb6ed28cddf0a9ed794dc5577537d3bf084b2cc4dbe5d09d28ec4e9b8e3d8d06122c818554ea725a5c03c6

        Download Submit

      • \??\c:\Users\Admin\AppData\Local\Temp\ggnm1atc\ggnm1atc.cmdline
        Filesize

        235B

        MD5

        8a9105e2963f4d8788bc25da3c92ccf2

        SHA1

        3c11c920068f3a5b9b4926d7e16274fd1044be60

        SHA256

        1d8823fe2e039c39fc56e9fe17b70077a80b6415e1582690764c0eade9146408

        SHA512

        db00e219612279fc5eca024dee28f10a74f6e2c14796865913d46e5416eaecc87122ce3975943b8086edf9a9bdaf025632d91b26e97c16497a21667eb2f06dc1

        Download Submit

      • \??\c:\Windows\System32\CSC32FD38885DE54877A42561DD7E49BD97.TMP
        Filesize

        1KB

        MD5

        19e1421a54f1523ab11614835b872fb8

        SHA1

        d2de7ead70215a7063c9598e4b22e2ddb2d8698b

        SHA256

        1cac65243c3e3a5b909055f131d60f31713dac08a3252319eb2740f39925aa29

        SHA512

        250bd7f0546d3ae68be7de5657666a0f4460ca6948e02d36d2e7a5a24b209682fb29126adbae5f8a94ba0d6903dcce0f07b71db6e18b69ed4cd31ea110f4798a

        Download Submit

      • memory/4052-20-0x0000000003150000-0x000000000316C000-memory.dmp

        Filesize

        112KB

        Download

      • memory/4052-25-0x0000000003120000-0x000000000312C000-memory.dmp

        Filesize

        48KB

        Download

      • memory/4052-23-0x0000000003170000-0x0000000003188000-memory.dmp

        Filesize

        96KB

        Download

      • memory/4052-21-0x000000001BBC0000-0x000000001BC10000-memory.dmp

        Filesize

        320KB

        Download

      • memory/4052-18-0x00000000030D0000-0x00000000030DE000-memory.dmp

        Filesize

        56KB

        Download

      • memory/4052-16-0x0000000000E40000-0x000000000101A000-memory.dmp

        Filesize

        1.9MB

        Download

      • memory/4052-15-0x00007FFF01063000-0x00007FFF01065000-memory.dmp

        Filesize

        8KB

        Download