Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    16-12-2024 02:14

General

  • Target

    5beb95e9c52536e5deb1099ee375559c4e46ff41f73e99af2f9367dd99f290f3N.exe

  • Size

    952KB

  • MD5

    723431372f19da7e4dab8fbd433ccca0

  • SHA1

    b9a8822d273051796975d7238980729376b4cd50

  • SHA256

    5beb95e9c52536e5deb1099ee375559c4e46ff41f73e99af2f9367dd99f290f3

  • SHA512

    26777d5f22d2a5ac073d3b3ae3333a329b12801a9b11dc0cbe629d4ca9c2e4d88f9286dde6fa1826afce3e6b535a560873b1835fb6bb311c8280d1527cbc40f8

  • SSDEEP

    24576:++O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:58/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 7 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 25 IoCs
  • Drops file in Windows directory 5 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 3 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\5beb95e9c52536e5deb1099ee375559c4e46ff41f73e99af2f9367dd99f290f3N.exe
    "C:\Users\Admin\AppData\Local\Temp\5beb95e9c52536e5deb1099ee375559c4e46ff41f73e99af2f9367dd99f290f3N.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2320
    • C:\Windows\System32\rasauto\smss.exe
      "C:\Windows\System32\rasauto\smss.exe"
      2⤵
      • UAC bypass
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Suspicious use of AdjustPrivilegeToken
      • System policy modification
      PID:1944
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\inf\.NET CLR Networking\0000\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2744
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\rasauto\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2864
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Users\All Users\Start Menu\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2604
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Windows\System32\KBDIT\services.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2712
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Windows\System32\ActionCenter\lsm.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2600
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\gpresult\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2532
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\msprivs\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2996

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\ProgramData\Microsoft\Windows\Start Menu\spoolsv.exe

    Filesize

    952KB

    MD5

    5325794b733ef1523c45e04e351b63be

    SHA1

    8e16c7e67f5c220dcf2217692f0d58b439483c9e

    SHA256

    aa7544c818119d85dc55b8e2023e5b5bc294f6abbd2cf8964bb4ce5b555042e4

    SHA512

    b65825655b498624f1a8d639a8abab9dffeb58ddcef054285bf9e025af7b6162a54d9d120e7aa0816c3b0d82b054b175fce8af263f714530d221b48b8c376da5

  • C:\Windows\System32\ActionCenter\lsm.exe

    Filesize

    952KB

    MD5

    723431372f19da7e4dab8fbd433ccca0

    SHA1

    b9a8822d273051796975d7238980729376b4cd50

    SHA256

    5beb95e9c52536e5deb1099ee375559c4e46ff41f73e99af2f9367dd99f290f3

    SHA512

    26777d5f22d2a5ac073d3b3ae3333a329b12801a9b11dc0cbe629d4ca9c2e4d88f9286dde6fa1826afce3e6b535a560873b1835fb6bb311c8280d1527cbc40f8

  • C:\Windows\System32\ActionCenter\lsm.exe

    Filesize

    952KB

    MD5

    aa3a4449fc09da9ce6f93736bf0b030b

    SHA1

    f37c9424b0b6579c5c7b6f944b39b9dc617fc14f

    SHA256

    b91a6e0d37c78480857fe08caf4858864967ff7715d9e465008f2d969843e14f

    SHA512

    0f7b9a56386d5caa0ea9a88bfbacabf6bf10c71d175c8ec0e4b71596e9dd598e1e9efd96340aa0bb53b5385f6b7c7dc782b51b3ef9a693c1e0fea644b0a31181

  • C:\Windows\System32\gpresult\spoolsv.exe

    Filesize

    952KB

    MD5

    a00fc9a81a1c020a442bee4cc107b0a6

    SHA1

    73732d1258ef81a125c523d816b120e765723c5e

    SHA256

    461100bd12725a5b6719f484d2bdcc054c7cc83fd9c64dd691f862642fe14ae3

    SHA512

    3be08ac4ce886f1db44ef0d679b15b28485e52974cf23540064c8354e799d7844efbc43d932f4328f1dd6718df8b2a4fcc5d0af163cebef5459575b4fb524875

  • C:\Windows\System32\rasauto\smss.exe

    Filesize

    952KB

    MD5

    0aaaaba382c2a4fb6a8e5d3da2d788ee

    SHA1

    7de6a5b60d89a498b7c7d413b60c642dfc4783bb

    SHA256

    dd29041e1cc0a86034211de3a41f1cd8188f032f4cc2906e038ee46f83ef9343

    SHA512

    5db747b2251236c16d047c54645cb00aa51ea3b622b8278a3091757a69c74b1943f2da256c3b7c11a89f02674659097d5a1dfa56b5dfb316400f4d7e0a9087b6

  • memory/1944-117-0x0000000001080000-0x0000000001174000-memory.dmp

    Filesize

    976KB

  • memory/2320-4-0x0000000000690000-0x00000000006A0000-memory.dmp

    Filesize

    64KB

  • memory/2320-7-0x0000000000900000-0x000000000090A000-memory.dmp

    Filesize

    40KB

  • memory/2320-8-0x0000000000910000-0x0000000000918000-memory.dmp

    Filesize

    32KB

  • memory/2320-9-0x0000000001F90000-0x0000000001F9A000-memory.dmp

    Filesize

    40KB

  • memory/2320-10-0x0000000001FA0000-0x0000000001FAC000-memory.dmp

    Filesize

    48KB

  • memory/2320-11-0x00000000006C0000-0x00000000006CC000-memory.dmp

    Filesize

    48KB

  • memory/2320-6-0x00000000006A0000-0x00000000006AC000-memory.dmp

    Filesize

    48KB

  • memory/2320-5-0x00000000003D0000-0x00000000003DA000-memory.dmp

    Filesize

    40KB

  • memory/2320-0-0x000007FEF5493000-0x000007FEF5494000-memory.dmp

    Filesize

    4KB

  • memory/2320-3-0x00000000003C0000-0x00000000003D0000-memory.dmp

    Filesize

    64KB

  • memory/2320-2-0x000007FEF5490000-0x000007FEF5E7C000-memory.dmp

    Filesize

    9.9MB

  • memory/2320-118-0x000007FEF5490000-0x000007FEF5E7C000-memory.dmp

    Filesize

    9.9MB

  • memory/2320-1-0x0000000000940000-0x0000000000A34000-memory.dmp

    Filesize

    976KB