Analysis

  • max time kernel
    148s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15-11-2024 07:41

General

  • Target

    1d13a84aa671b75f66f4c7fce8339619291d4a43.exe

  • Size

    775KB

  • MD5

    0ed1f9cb842483e03e36cee538678ffd

  • SHA1

    1d13a84aa671b75f66f4c7fce8339619291d4a43

  • SHA256

    24f719954fbcfd391426579d7f4965d2771f0d2751bed291e6a8dd26228315cc

  • SHA512

    78cb214db0ecbc532a50fc1344a138125e0031485c004e95bc21064165f9fd667fa582cd5196a6e1b4276b6dd7fa1d23dfabfe0c58b0d93fbf8e5329b064a809

  • SSDEEP

    12288:FFg6HIZxWaga+z9e9qJeyLVqlUhqgPXdU2ypi0w8ncqXuvVw4heSNSzLz/:FIrr+h0qJeiqlGVUskcz9w4jI3b

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • DCRat payload 1 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 4 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 11 IoCs

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

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

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies registry class 1 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 35 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe
    "C:\Users\Admin\AppData\Local\Temp\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1680
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2552
    • C:\Users\Admin\AppData\Local\Temp\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe
      "C:\Users\Admin\AppData\Local\Temp\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe"
      2⤵
      • Checks computer location settings
      • Drops file in Program Files directory
      • Drops file in Windows directory
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1672
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "services" /sc ONLOGON /tr "'C:\Windows\ja-JP\services.exe'" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:4052
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartUI\StartMenuExperienceHost.exe'" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:4004
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Windows Mail\fontdrvhost.exe'" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3012
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-core-file-l2-1-0\OfficeClickToRun.exe'" /rl HIGHEST /f
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:3276
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Gvm46Oxs3i.bat"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4532
        • C:\Windows\SysWOW64\chcp.com
          chcp 65001
          4⤵
          • System Location Discovery: System Language Discovery
          PID:1492
        • C:\Windows\SysWOW64\PING.EXE
          ping -n 5 localhost
          4⤵
          • System Location Discovery: System Language Discovery
          • System Network Configuration Discovery: Internet Connection Discovery
          • Runs ping.exe
          PID:3228
        • C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-core-file-l2-1-0\OfficeClickToRun.exe
          "C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-core-file-l2-1-0\OfficeClickToRun.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:3672

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Program Files\Common Files\microsoft shared\ClickToRun\api-ms-win-core-file-l2-1-0\OfficeClickToRun.exe

    Filesize

    775KB

    MD5

    0ed1f9cb842483e03e36cee538678ffd

    SHA1

    1d13a84aa671b75f66f4c7fce8339619291d4a43

    SHA256

    24f719954fbcfd391426579d7f4965d2771f0d2751bed291e6a8dd26228315cc

    SHA512

    78cb214db0ecbc532a50fc1344a138125e0031485c004e95bc21064165f9fd667fa582cd5196a6e1b4276b6dd7fa1d23dfabfe0c58b0d93fbf8e5329b064a809

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\1d13a84aa671b75f66f4c7fce8339619291d4a43.exe.log

    Filesize

    1KB

    MD5

    84e77a587d94307c0ac1357eb4d3d46f

    SHA1

    83cc900f9401f43d181207d64c5adba7a85edc1e

    SHA256

    e16024b092a026a9dc00df69d4b9bbcab7b2dc178dc5291fc308a1abc9304a99

    SHA512

    aefb5c62200b3ed97718d20a89990954d4d8acdc0a6a73c5a420f1bba619cb79e70c2cd0a579b9f52dc6b09e1de2cea6cd6cac4376cfee92d94e2c01d310f691

  • C:\Users\Admin\AppData\Local\Temp\Gvm46Oxs3i.bat

    Filesize

    272B

    MD5

    97310bc77ffc46731fb8043857ac92d3

    SHA1

    bd809c689007c93d3eab7a635c6ee575ac9f4f53

    SHA256

    e99fc2ba7b63aacc53e122a3854434edb49721f7ae3474796b93b0858240c651

    SHA512

    5380713c8f26395e7a1c0ed3e8e60077e9704aebb7abc522eedcde831fa82e389e419ab0e71343614c673312654cebcd1d6d5fc67d73822c4382cc26f5c2caf6

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_oocc3is4.d4i.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • memory/1672-63-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1672-77-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1672-19-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1672-17-0x0000000004E00000-0x0000000004E66000-memory.dmp

    Filesize

    408KB

  • memory/1672-15-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1672-12-0x0000000000400000-0x0000000000478000-memory.dmp

    Filesize

    480KB

  • memory/1680-10-0x0000000001030000-0x00000000010D0000-memory.dmp

    Filesize

    640KB

  • memory/1680-11-0x00000000086A0000-0x0000000008720000-memory.dmp

    Filesize

    512KB

  • memory/1680-9-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1680-8-0x000000007521E000-0x000000007521F000-memory.dmp

    Filesize

    4KB

  • memory/1680-7-0x00000000055D0000-0x00000000055DA000-memory.dmp

    Filesize

    40KB

  • memory/1680-16-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1680-5-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/1680-6-0x0000000005280000-0x000000000528A000-memory.dmp

    Filesize

    40KB

  • memory/1680-4-0x0000000005380000-0x000000000541C000-memory.dmp

    Filesize

    624KB

  • memory/1680-3-0x00000000052E0000-0x0000000005372000-memory.dmp

    Filesize

    584KB

  • memory/1680-2-0x0000000005890000-0x0000000005E34000-memory.dmp

    Filesize

    5.6MB

  • memory/1680-1-0x0000000000810000-0x00000000008D4000-memory.dmp

    Filesize

    784KB

  • memory/1680-0-0x000000007521E000-0x000000007521F000-memory.dmp

    Filesize

    4KB

  • memory/2552-22-0x0000000004EF0000-0x0000000004F12000-memory.dmp

    Filesize

    136KB

  • memory/2552-52-0x00000000072F0000-0x000000000730A000-memory.dmp

    Filesize

    104KB

  • memory/2552-34-0x0000000005980000-0x0000000005CD4000-memory.dmp

    Filesize

    3.3MB

  • memory/2552-35-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/2552-36-0x0000000005FC0000-0x0000000005FDE000-memory.dmp

    Filesize

    120KB

  • memory/2552-37-0x0000000006000000-0x000000000604C000-memory.dmp

    Filesize

    304KB

  • memory/2552-38-0x0000000006F70000-0x0000000006FA2000-memory.dmp

    Filesize

    200KB

  • memory/2552-49-0x0000000006590000-0x00000000065AE000-memory.dmp

    Filesize

    120KB

  • memory/2552-39-0x0000000070E70000-0x0000000070EBC000-memory.dmp

    Filesize

    304KB

  • memory/2552-50-0x0000000006FB0000-0x0000000007053000-memory.dmp

    Filesize

    652KB

  • memory/2552-51-0x0000000007930000-0x0000000007FAA000-memory.dmp

    Filesize

    6.5MB

  • memory/2552-33-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/2552-53-0x0000000007360000-0x000000000736A000-memory.dmp

    Filesize

    40KB

  • memory/2552-54-0x0000000007570000-0x0000000007606000-memory.dmp

    Filesize

    600KB

  • memory/2552-55-0x00000000074F0000-0x0000000007501000-memory.dmp

    Filesize

    68KB

  • memory/2552-56-0x0000000007520000-0x000000000752E000-memory.dmp

    Filesize

    56KB

  • memory/2552-57-0x0000000007530000-0x0000000007544000-memory.dmp

    Filesize

    80KB

  • memory/2552-58-0x0000000007630000-0x000000000764A000-memory.dmp

    Filesize

    104KB

  • memory/2552-59-0x0000000007610000-0x0000000007618000-memory.dmp

    Filesize

    32KB

  • memory/2552-62-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/2552-23-0x0000000005710000-0x0000000005776000-memory.dmp

    Filesize

    408KB

  • memory/2552-20-0x0000000075210000-0x00000000759C0000-memory.dmp

    Filesize

    7.7MB

  • memory/2552-21-0x00000000050E0000-0x0000000005708000-memory.dmp

    Filesize

    6.2MB

  • memory/2552-18-0x00000000026A0000-0x00000000026D6000-memory.dmp

    Filesize

    216KB