Analysis
- max time kernel
150s - max time network
151s - platform
windows10_x64 - resource
win10v20210410 - submitted
29/07/2021, 11:29
General
- Target cc982bb10719da0325bdd790df6b3a03.exe
- Size 710KB
- Sample210729-ex2e7w641x
- SHA256 23b110e0a381abb4d44bd7e2906548429ee426d9463a02af31dc3dd98c044341
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 6 IoCs
- Process spawned unexpected child process 6 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.
- Adds Run key to start application 2 TTPs 12 IoCs
- Looks up external IP address via web service 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Drops file in System32 directory 5 IoCs
- Drops file in Windows 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 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Modifies registry class 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 8 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\cc982bb10719da0325bdd790df6b3a03.exe"C:\Users\Admin\AppData\Local\Temp\cc982bb10719da0325bdd790df6b3a03.exe"1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\LYEVc8iarH.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\chcp.comchcp 650013⤵
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵
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C:\Windows\System32\ddraw\dllhost.exe"C:\Windows\System32\ddraw\dllhost.exe"3⤵
- 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 "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\ddraw\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Boot\qps-ploc\dwm.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Boot\es-MX\OfficeClickToRun.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchUI" /sc ONLOGON /tr "'C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\ReactiveAgentsCommon\SearchUI.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\WEMSAL_WmiProvider_uninstall\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cc982bb10719da0325bdd790df6b3a03" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\sa.9NBLGGH4VZW5_0_0010_.Public.InstallAgent\cc982bb10719da0325bdd790df6b3a03.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/2768-132-0x0000000000EA0000-0x0000000000EA2000-memory.dmp
memory/2768-126-0x0000000002A40000-0x0000000002A42000-memory.dmp
memory/2768-127-0x0000000000B60000-0x0000000000B66000-memory.dmp
memory/2768-128-0x0000000000B40000-0x0000000000B47000-memory.dmp
memory/2768-129-0x0000000000E50000-0x0000000000E56000-memory.dmp
memory/2768-130-0x0000000000B30000-0x0000000000B35000-memory.dmp
memory/2768-131-0x0000000000E60000-0x0000000000E62000-memory.dmp
memory/2768-133-0x0000000001080000-0x0000000001082000-memory.dmp
memory/2768-134-0x000000001DF50000-0x000000001DF51000-memory.dmp
memory/2768-135-0x000000001F9B0000-0x000000001F9B1000-memory.dmp
memory/4036-116-0x000000001BC90000-0x000000001BC92000-memory.dmp
memory/4036-114-0x0000000000EA0000-0x0000000000EA1000-memory.dmp