Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    24-05-2024 03:30

General

  • Target

    ce8abab7abf2a2ed224d8c9a3fe10114547c743518e905765b8d8ef76500cabc.exe

  • Size

    2.7MB

  • MD5

    8a988516d37df432161e208d0d8c42bd

  • SHA1

    58598135c7dced1b5266814edc5e44afc5dda59f

  • SHA256

    ce8abab7abf2a2ed224d8c9a3fe10114547c743518e905765b8d8ef76500cabc

  • SHA512

    f546d5ab0de84baa5a580a576df5ed19e90b220501b0f251932fec9755391b8cb7b6080f523fe79322ea25fbca44eaf2bd6f600d94d7e090b624d3f86852e6a3

  • SSDEEP

    49152:iH64y2XDuLlIY14o9/yDzr1xJ8XbRrC9mWvR08Yv7yP3GcY:iHfE5Ad8Xd295UmGc

Malware Config

Signatures

  • DcRat

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

  • Modifies WinLogon for persistence 2 TTPs 7 IoCs
  • Process spawned unexpected child process 21 IoCs

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

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

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Detects executables packed with SmartAssembly 8 IoCs
  • 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.

  • 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 Program Files directory 12 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 21 IoCs

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

  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 35 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 6 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\ce8abab7abf2a2ed224d8c9a3fe10114547c743518e905765b8d8ef76500cabc.exe
    "C:\Users\Admin\AppData\Local\Temp\ce8abab7abf2a2ed224d8c9a3fe10114547c743518e905765b8d8ef76500cabc.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1548
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell" -Command Add-MpPreference -ExclusionPath 'C:\'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2776
    • C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe
      "C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe"
      2⤵
      • UAC bypass
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • System policy modification
      PID:1208
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\ja\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:3032
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\ja\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2696
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\ja\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2676
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Portable Devices\taskhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2516
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2544
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "taskhostt" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Portable Devices\taskhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2632
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 10 /tr "'C:\Users\Default\lsm.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2196
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Users\Default\lsm.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:1876
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsml" /sc MINUTE /mo 12 /tr "'C:\Users\Default\lsm.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:1860
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 8 /tr "'C:\Windows\Resources\Ease of Access Themes\smss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2572
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\Resources\Ease of Access Themes\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2612
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 14 /tr "'C:\Windows\Resources\Ease of Access Themes\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2780
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Program Files\VideoLAN\VLC\skins\lsass.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2416
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files\VideoLAN\VLC\skins\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:308
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 9 /tr "'C:\Program Files\VideoLAN\VLC\skins\lsass.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:1296
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2020
  • 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
    • Creates scheduled task(s)
    PID:2228
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /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
    • Creates scheduled task(s)
    PID:1684
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorere" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Package Cache\{5740BD44-B58D-321A-AFC0-6D3D4556DD6C}v12.0.40660\explorer.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:2016
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\All Users\Package Cache\{5740BD44-B58D-321A-AFC0-6D3D4556DD6C}v12.0.40660\explorer.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:344
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "explorere" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Package Cache\{5740BD44-B58D-321A-AFC0-6D3D4556DD6C}v12.0.40660\explorer.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Creates scheduled task(s)
    PID:1644

Network

MITRE ATT&CK Matrix ATT&CK v13

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

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

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

5
T1112

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Subvert Trust Controls

1
T1553

Install Root Certificate

1
T1553.004

Discovery

System Information Discovery

2
T1082

Query Registry

1
T1012

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Program Files\VideoLAN\VLC\skins\lsass.exe
    Filesize

    2.7MB

    MD5

    8a988516d37df432161e208d0d8c42bd

    SHA1

    58598135c7dced1b5266814edc5e44afc5dda59f

    SHA256

    ce8abab7abf2a2ed224d8c9a3fe10114547c743518e905765b8d8ef76500cabc

    SHA512

    f546d5ab0de84baa5a580a576df5ed19e90b220501b0f251932fec9755391b8cb7b6080f523fe79322ea25fbca44eaf2bd6f600d94d7e090b624d3f86852e6a3

  • memory/1208-103-0x0000000000C50000-0x0000000000F10000-memory.dmp
    Filesize

    2.8MB

  • memory/1548-16-0x0000000000D60000-0x0000000000D68000-memory.dmp
    Filesize

    32KB

  • memory/1548-4-0x0000000000260000-0x000000000027C000-memory.dmp
    Filesize

    112KB

  • memory/1548-17-0x0000000000D70000-0x0000000000D7C000-memory.dmp
    Filesize

    48KB

  • memory/1548-6-0x0000000000290000-0x00000000002A0000-memory.dmp
    Filesize

    64KB

  • memory/1548-5-0x0000000000280000-0x0000000000288000-memory.dmp
    Filesize

    32KB

  • memory/1548-8-0x00000000004C0000-0x00000000004C8000-memory.dmp
    Filesize

    32KB

  • memory/1548-7-0x00000000004A0000-0x00000000004B6000-memory.dmp
    Filesize

    88KB

  • memory/1548-9-0x0000000000650000-0x0000000000658000-memory.dmp
    Filesize

    32KB

  • memory/1548-10-0x0000000000660000-0x0000000000670000-memory.dmp
    Filesize

    64KB

  • memory/1548-11-0x0000000000CA0000-0x0000000000CAA000-memory.dmp
    Filesize

    40KB

  • memory/1548-12-0x000000001AE20000-0x000000001AE76000-memory.dmp
    Filesize

    344KB

  • memory/1548-13-0x0000000000CB0000-0x0000000000CB8000-memory.dmp
    Filesize

    32KB

  • memory/1548-14-0x0000000000CC0000-0x0000000000CC8000-memory.dmp
    Filesize

    32KB

  • memory/1548-15-0x0000000000CD0000-0x0000000000CDC000-memory.dmp
    Filesize

    48KB

  • memory/1548-0-0x000007FEF56B3000-0x000007FEF56B4000-memory.dmp
    Filesize

    4KB

  • memory/1548-3-0x0000000000250000-0x0000000000258000-memory.dmp
    Filesize

    32KB

  • memory/1548-18-0x0000000000D80000-0x0000000000D8C000-memory.dmp
    Filesize

    48KB

  • memory/1548-19-0x0000000000D90000-0x0000000000D98000-memory.dmp
    Filesize

    32KB

  • memory/1548-20-0x0000000000DE0000-0x0000000000DE8000-memory.dmp
    Filesize

    32KB

  • memory/1548-21-0x0000000000DF0000-0x0000000000DFC000-memory.dmp
    Filesize

    48KB

  • memory/1548-22-0x0000000000E00000-0x0000000000E0C000-memory.dmp
    Filesize

    48KB

  • memory/1548-23-0x0000000001290000-0x0000000001298000-memory.dmp
    Filesize

    32KB

  • memory/1548-24-0x00000000012A0000-0x00000000012AA000-memory.dmp
    Filesize

    40KB

  • memory/1548-25-0x000000001AE70000-0x000000001AE7C000-memory.dmp
    Filesize

    48KB

  • memory/1548-28-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp
    Filesize

    9.9MB

  • memory/1548-2-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp
    Filesize

    9.9MB

  • memory/1548-1-0x00000000013B0000-0x0000000001670000-memory.dmp
    Filesize

    2.8MB

  • memory/1548-104-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp
    Filesize

    9.9MB

  • memory/2776-105-0x00000000022A0000-0x00000000022A8000-memory.dmp
    Filesize

    32KB

  • memory/2776-102-0x000000001B6B0000-0x000000001B992000-memory.dmp
    Filesize

    2.9MB