Analysis
- max time kernel
4s - max time network
45s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
11/01/2024, 08:58
General
- Target 5315d9d4c171c5cbe6bc6f2471043464.exe
- Size 2.3MB
- Sample240111-kxdlbschdk
- SHA256 34ac386ebfdf81651993e0f0c92e514ce59eca3c324ceff77542e8bf7bc91269
Malware Config
Signatures
- DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- Process spawned unexpected child process 5 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- DCRat payload 6 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Identifies Wine through registry keys 2 TTPs 1 IoCs
Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.
- Adds Run key to start application 2 TTPs 2 IoCs
- Drops file in System32 directory 5 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Drops file in Program Files directory 2 IoCs
- Creates scheduled task(s) 1 TTPs 5 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 6 IoCs
- Suspicious use of AdjustPrivilegeToken 1 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\5315d9d4c171c5cbe6bc6f2471043464.exe"C:\Users\Admin\AppData\Local\Temp\5315d9d4c171c5cbe6bc6f2471043464.exe"1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Identifies Wine through registry keys
- Adds Run key to start application
- Drops file in System32 directory
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
C:\Windows\SysWOW64\WsmRes\backgroundTaskHost.exe"C:\Windows\System32\WsmRes\backgroundTaskHost.exe"2⤵
-
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\KBDFI1\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\SearchApp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "5315d9d4c171c5cbe6bc6f2471043464" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\wct540B\5315d9d4c171c5cbe6bc6f2471043464.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\WsmRes\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\KBDCAN\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Replay Monitor
Loading Replay Monitor...
Downloads
memory/2660-6-0x00000000077F0000-0x000000000788C000-memory.dmp
memory/2660-31-0x0000000000910000-0x0000000000E24000-memory.dmp
memory/2660-4-0x0000000000910000-0x0000000000E24000-memory.dmp
memory/2660-0-0x0000000000910000-0x0000000000E24000-memory.dmp
memory/2660-5-0x0000000007E80000-0x0000000008424000-memory.dmp
memory/2660-2-0x0000000000910000-0x0000000000E24000-memory.dmp
memory/2660-9-0x0000000007A40000-0x0000000007AA6000-memory.dmp
memory/2660-1-0x00000000775A4000-0x00000000775A6000-memory.dmp
memory/2660-3-0x0000000074390000-0x0000000074B40000-memory.dmp
memory/2660-32-0x0000000074390000-0x0000000074B40000-memory.dmp
memory/3176-29-0x00000000004C0000-0x00000000009D4000-memory.dmp
memory/3176-35-0x00000000004C0000-0x00000000009D4000-memory.dmp
memory/3176-33-0x0000000074390000-0x0000000074B40000-memory.dmp
memory/3176-34-0x00000000004C0000-0x00000000009D4000-memory.dmp
memory/3176-36-0x0000000007780000-0x000000000778C000-memory.dmp
memory/3176-39-0x00000000004C0000-0x00000000009D4000-memory.dmp
memory/3176-40-0x0000000074390000-0x0000000074B40000-memory.dmp