Analysis

  • max time kernel
    23s
  • max time network
    20s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    06-12-2024 05:26

General

  • Target

    600d9427269badcbd7bb8635d82c3722b6475d0479787498811ee247cc2d53bdN.exe

  • Size

    952KB

  • MD5

    dc33393b307bd0e4092fba53020cf2b0

  • SHA1

    9341b0a2c621e016142f7c78569b0321da0b85f8

  • SHA256

    600d9427269badcbd7bb8635d82c3722b6475d0479787498811ee247cc2d53bd

  • SHA512

    7b7c6a5c2d5b143ef850603fdde43e455fae8eb1913b644029779348d2247d90efd72c58e623712057051ab30107bfa8beb62dd9b3c89c0a6389b4547ad8a3af

  • SSDEEP

    24576:e+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:Z8/KfRTK

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 7 IoCs
  • Process spawned unexpected child process 7 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 4 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 14 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in System32 directory 15 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 7 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 6 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\600d9427269badcbd7bb8635d82c3722b6475d0479787498811ee247cc2d53bdN.exe
    "C:\Users\Admin\AppData\Local\Temp\600d9427269badcbd7bb8635d82c3722b6475d0479787498811ee247cc2d53bdN.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2764
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\5DmxzuARGg.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1844
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:2080
        • C:\Windows\System32\SearchIndexer\wininit.exe
          "C:\Windows\System32\SearchIndexer\wininit.exe"
          3⤵
          • UAC bypass
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Suspicious use of AdjustPrivilegeToken
          • System policy modification
          PID:2180
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\ProgramData\Desktop\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2664
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\480d7142-91a3-11ef-b9f6-6e5a89f5a3c7\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2736
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\System32\SearchIndexer\wininit.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2196
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Users\Public\Favorites\taskhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:584
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\fdWNet\WmiPrvSE.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2344
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2184
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\scext\sppsvc.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2188

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Recovery\480d7142-91a3-11ef-b9f6-6e5a89f5a3c7\RCX7776.tmp

      Filesize

      952KB

      MD5

      361d0f1288fbc38a38ee3edf079f317c

      SHA1

      6de347dbc38c390ac7ce7d167c6853210e5a41fd

      SHA256

      420a8c9517f18877c9c0a2500d762c4c373669ccface46d7ddcaca8e6ce15f1c

      SHA512

      44a81161bf0e4f08970cdd3fc4890db92cabe30db3ae9cc92e610b2adb8b9dfd3866c81dba6fb1cc29a6c0936b12a9e571c0c8fe306ff5a992022d8602d4e224

    • C:\Users\Admin\AppData\Local\Temp\5DmxzuARGg.bat

      Filesize

      209B

      MD5

      3855b7ab651238aff04bb7364b79457f

      SHA1

      6ace4dc85b8b4bf237847e054f4ea8ccf11c12c4

      SHA256

      bffa0f8fbfec3d5471ccba1b48de8440a600c71920d1e0bae1cf3aef0aa05c84

      SHA512

      7a2b66441576aeae61d7701b614cc022516c442c28d88b19ea9687ce252e830fe6ebcf5e954280614f1655b29c023acec2c4fc4d0cc14f08ce6a86e63df0affb

    • C:\Windows\System32\wbem\fdWNet\WmiPrvSE.exe

      Filesize

      952KB

      MD5

      dc33393b307bd0e4092fba53020cf2b0

      SHA1

      9341b0a2c621e016142f7c78569b0321da0b85f8

      SHA256

      600d9427269badcbd7bb8635d82c3722b6475d0479787498811ee247cc2d53bd

      SHA512

      7b7c6a5c2d5b143ef850603fdde43e455fae8eb1913b644029779348d2247d90efd72c58e623712057051ab30107bfa8beb62dd9b3c89c0a6389b4547ad8a3af

    • memory/2180-113-0x00000000000E0000-0x00000000001D4000-memory.dmp

      Filesize

      976KB

    • memory/2764-4-0x00000000005F0000-0x0000000000600000-memory.dmp

      Filesize

      64KB

    • memory/2764-7-0x00000000020A0000-0x00000000020AA000-memory.dmp

      Filesize

      40KB

    • memory/2764-6-0x0000000001EE0000-0x0000000001EEC000-memory.dmp

      Filesize

      48KB

    • memory/2764-5-0x00000000005E0000-0x00000000005EA000-memory.dmp

      Filesize

      40KB

    • memory/2764-8-0x0000000001F00000-0x0000000001F08000-memory.dmp

      Filesize

      32KB

    • memory/2764-10-0x0000000001EF0000-0x0000000001EFC000-memory.dmp

      Filesize

      48KB

    • memory/2764-9-0x0000000000710000-0x000000000071A000-memory.dmp

      Filesize

      40KB

    • memory/2764-11-0x0000000002170000-0x000000000217C000-memory.dmp

      Filesize

      48KB

    • memory/2764-0-0x000007FEF66B3000-0x000007FEF66B4000-memory.dmp

      Filesize

      4KB

    • memory/2764-3-0x00000000005D0000-0x00000000005E0000-memory.dmp

      Filesize

      64KB

    • memory/2764-2-0x000007FEF66B0000-0x000007FEF709C000-memory.dmp

      Filesize

      9.9MB

    • memory/2764-110-0x000007FEF66B0000-0x000007FEF709C000-memory.dmp

      Filesize

      9.9MB

    • memory/2764-1-0x0000000000020000-0x0000000000114000-memory.dmp

      Filesize

      976KB