Analysis
- max time kernel
80s - max time network
151s - platform
windows10_x64 - resource
win10-en - submitted
13/09/2021, 07:48
General
- Target 8106d9ab42eacd3d5c1f4f49ba80f65dd60f8d812d2274b2ae1b2fb23048944f.exe
- Size 1.3MB
- Sample210913-jm5fmadca5
- SHA256 8106d9ab42eacd3d5c1f4f49ba80f65dd60f8d812d2274b2ae1b2fb23048944f
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 5 IoCs
- Process spawned unexpected child process 5 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.
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 10 IoCs
- Drops file in System32 directory 4 IoCs
- Drops file in Program Files directory 2 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- 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 3 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 2 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\8106d9ab42eacd3d5c1f4f49ba80f65dd60f8d812d2274b2ae1b2fb23048944f.exe"C:\Users\Admin\AppData\Local\Temp\8106d9ab42eacd3d5c1f4f49ba80f65dd60f8d812d2274b2ae1b2fb23048944f.exe"1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\msdrm\lsass.exe"C:\Windows\System32\msdrm\lsass.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\System.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:\Program Files\Uninstall Information\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Windows\System32\msdrm\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\Public\Desktop\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\winrs\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/596-124-0x0000000000B20000-0x0000000000B26000-memory.dmp
memory/596-123-0x000000001BA02000-0x000000001BA03000-memory.dmp
memory/596-125-0x0000000000B30000-0x0000000000B36000-memory.dmp
memory/596-126-0x0000000000B60000-0x0000000000B62000-memory.dmp
memory/596-127-0x0000000000B80000-0x0000000000B85000-memory.dmp
memory/596-128-0x0000000000B90000-0x0000000000B92000-memory.dmp
memory/596-129-0x0000000000BA0000-0x0000000000BA4000-memory.dmp
memory/596-130-0x000000001BA13000-0x000000001BA14000-memory.dmp
memory/596-131-0x000000001BA14000-0x000000001BA15000-memory.dmp
memory/3340-117-0x000000001B8B0000-0x000000001B8B2000-memory.dmp
memory/3340-115-0x0000000000C40000-0x0000000000C41000-memory.dmp