Analysis
- max time kernel
118s - max time network
162s - platform
windows10_x64 - resource
win10v20210408 - submitted
16/09/2021, 07:01
General
- Target a4b944037ed7b87c089eae29e7999be0.exe
- Size 1.1MB
- Sample210916-hs7x9scea8
- SHA256 3943324bc46207fd39e2518eb019a79eaceaef8b0d24c02f980384fea0fdacf8
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 4 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
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Adds Run key to start application 2 TTPs 4 IoCs
- Drops file in System32 directory 3 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 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 10 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of WriteProcessMemory 2 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\a4b944037ed7b87c089eae29e7999be0.exe"C:\Users\Admin\AppData\Local\Temp\a4b944037ed7b87c089eae29e7999be0.exe"1⤵
- 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\rdpcore\sihost.exe"C:\Windows\System32\rdpcore\sihost.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Windows\System32\rdpcore\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Documents and Settings\spoolsv.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Boot\uk-UA\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files\Windows Security\BrowserCore\en-US\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
-
C:\Windows\system32\vssvc.exeC:\Windows\system32\vssvc.exe1⤵
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
memory/580-114-0x0000000000120000-0x0000000000121000-memory.dmp
memory/580-116-0x000000001AF20000-0x000000001AF22000-memory.dmp
memory/3556-122-0x0000000000A60000-0x0000000000A66000-memory.dmp
memory/3556-123-0x0000000000A80000-0x0000000000A81000-memory.dmp
memory/3556-124-0x0000000000A90000-0x0000000000A91000-memory.dmp
memory/3556-125-0x0000000002250000-0x0000000002252000-memory.dmp
memory/3556-126-0x0000000000A70000-0x0000000000A72000-memory.dmp