Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20240611-en - resource tags
- submitted
14/06/2024, 01:42
General
- Target c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe
- Size 2.3MB
- Sample240614-b4sjdsthkn
- SHA256 c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693
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 9 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- DCRat payload 2 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Drops file in Program Files directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 9 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 18 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 2 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\c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe"C:\Users\Admin\AppData\Local\Temp\c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe"1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\Windows Sidebar\Gadgets\RuntimeBroker.exe"C:\Program Files (x86)\Windows Sidebar\Gadgets\RuntimeBroker.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
-
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\SendTo\dllhost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Admin\SendTo\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Users\Admin\SendTo\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693c" /sc MINUTE /mo 5 /tr "'C:\Users\Default\c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693" /sc ONLOGON /tr "'C:\Users\Default\c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693c" /sc MINUTE /mo 11 /tr "'C:\Users\Default\c7d5c20a8f8704cd72855276ade10f22dc95cbce0d89aedcaab2ad64a8753693.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
RuntimeBroker.exe
memory/528-6-0x000000001BA00000-0x000000001BA56000-memory.dmp
memory/528-9-0x0000000003210000-0x000000000321E000-memory.dmp
memory/528-3-0x0000000003030000-0x000000000304C000-memory.dmp
memory/528-0-0x00007FFE00E93000-0x00007FFE00E95000-memory.dmp
memory/528-5-0x0000000003170000-0x0000000003186000-memory.dmp
memory/528-4-0x00000000031C0000-0x0000000003210000-memory.dmp
memory/528-2-0x00007FFE00E90000-0x00007FFE01951000-memory.dmp
memory/528-11-0x000000001BA50000-0x000000001BA58000-memory.dmp
memory/528-7-0x0000000003190000-0x00000000031A2000-memory.dmp
memory/528-10-0x0000000003220000-0x0000000003228000-memory.dmp
memory/528-8-0x000000001CAB0000-0x000000001CFD8000-memory.dmp
memory/528-1-0x0000000000BD0000-0x0000000000E22000-memory.dmp
memory/528-29-0x00007FFE00E90000-0x00007FFE01951000-memory.dmp
memory/1852-30-0x000000001D300000-0x000000001D356000-memory.dmp
memory/1852-31-0x000000001BFF0000-0x000000001C002000-memory.dmp