Analysis
- max time kernel
1s - max time network
119s - platform
windows7_x64 - resource
win7-20231215-en - resource tags
- submitted
10/01/2024, 04:58
General
- Target 4f85fd9da0e6d825b520f09905b16301.exe
- Size 1.1MB
- Sample240110-fl152aeafn
- SHA256 fd9e479531a11076bfa97269d4562bda4571f3f03f00e049e3e125d82099e942
Malware Config
Signatures
- DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- DCRat payload 7 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Adds Run key to start application 2 TTPs 6 IoCs
- Drops file in Program Files directory 9 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 1 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\4f85fd9da0e6d825b520f09905b16301.exe"C:\Users\Admin\AppData\Local\Temp\4f85fd9da0e6d825b520f09905b16301.exe"1⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
C:\ProgramData\Adobe\Updater6\4f85fd9da0e6d825b520f09905b16301.exe"C:\ProgramData\Adobe\Updater6\4f85fd9da0e6d825b520f09905b16301.exe"2⤵
-
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "4f85fd9da0e6d825b520f09905b16301" /sc ONLOGON /tr "'C:\ProgramData\Adobe\Updater6\4f85fd9da0e6d825b520f09905b16301.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Reader 9.0\Esl\dwm.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\dllhost.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\PerfLogs\Admin\smss.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Portable Devices\csrss.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
-
C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\sppsvc.exe'" /rl HIGHEST /f1⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
dwm.exe
4f85fd9da0e6d825b520f09905b16301.exe
4f85fd9da0e6d825b520f09905b16301.exe
memory/2196-22-0x000007FEF5EF0000-0x000007FEF68DC000-memory.dmp
memory/2196-0-0x0000000000AF0000-0x0000000000C12000-memory.dmp
memory/2196-2-0x000000001B030000-0x000000001B0B0000-memory.dmp
memory/2196-1-0x000007FEF5EF0000-0x000007FEF68DC000-memory.dmp
memory/2668-24-0x000000001A860000-0x000000001A8E0000-memory.dmp
memory/2668-23-0x000007FEF5EF0000-0x000007FEF68DC000-memory.dmp
memory/2668-21-0x00000000008D0000-0x00000000009F2000-memory.dmp
memory/2668-25-0x000007FEF5EF0000-0x000007FEF68DC000-memory.dmp
memory/2668-26-0x000000001A860000-0x000000001A8E0000-memory.dmp
memory/2668-27-0x000007FEF5EF0000-0x000007FEF68DC000-memory.dmp