Analysis
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max time kernel
122s -
max time network
123s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
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submitted
23-12-2024 00:00
General
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Target
771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.exe
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Size
952KB
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MD5
066ac67ff4803f8053decd2f83d5834e
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SHA1
4f9a371bbbb0d601d36eb150134397c8e2fb4b06
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SHA256
771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3
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SHA512
9ffaf8455c3b36c6c06bd1fd7dd63544376ee5699769b14041186152a428a213be6174c55531cdd46896038d20297e27ccb90a167c1d1537bb73ec4bf516c305
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SSDEEP
24576:W+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:x8/KfRTK
Malware Config
Signatures
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Dcrat family
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Modifies WinLogon for persistence 2 TTPs 8 IoCs
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Process spawned unexpected child process 8 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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UAC bypass 3 TTPs 6 IoCs
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DCRat payload 5 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
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Executes dropped EXE 1 IoCs
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Adds Run key to start application 2 TTPs 16 IoCs
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Checks whether UAC is enabled 1 TTPs 4 IoCs
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Drops file in Program Files directory 10 IoCs
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Drops file in Windows directory 5 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Scheduled Task/Job: Scheduled Task 1 TTPs 8 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 1 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
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Suspicious use of WriteProcessMemory 3 IoCs
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System policy modification 1 TTPs 6 IoCs
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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
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C:\Users\Admin\AppData\Local\Temp\771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.exe"C:\Users\Admin\AppData\Local\Temp\771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\services.exe"C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\services.exe"2⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- System policy modification
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0018-0409-0000-0000000FF1CE}-C\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\PerfLogs\Admin\sppsvc.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Documents and Settings\audiodg.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\dwm.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\18fc4542-69f6-11ef-a46c-62cb582c238c\services.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\es-ES\System.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.0\taskhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\Setup\State\sppsvc.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
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Downloads
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Filesize
952KB
MD56b2f60e31d40b5765a8522a2cc9c3583
SHA162d4090fd7b306291fd8a84673768426ce83971c
SHA25660346fc0bead8c1c6ab69cc950b9b0ed39db936c2b9c177f0bd5d4e9d93daa4e
SHA5127778cab00725809d96cd230f769449a08dc2bf22c2f21a9a8d85d54426f353bdb48666694bf9158a3673cc5ae462583c48fe9a201f26caa9b60c92bfa680f885
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Filesize
952KB
MD5066ac67ff4803f8053decd2f83d5834e
SHA14f9a371bbbb0d601d36eb150134397c8e2fb4b06
SHA256771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3
SHA5129ffaf8455c3b36c6c06bd1fd7dd63544376ee5699769b14041186152a428a213be6174c55531cdd46896038d20297e27ccb90a167c1d1537bb73ec4bf516c305
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Filesize
952KB
MD583ce91206bf83164010fc832b4788948
SHA1cb1420b08785daf68679a924464696aa2b2ef279
SHA2565948ddd78046bc4f36162a84d38e773041536fe97ac2d5399d5f1ba8ed8cf509
SHA5123ec7f68021487cf86332b479f917f38ba834120af019cf3bdc3ba268f476deea5c4a2c5ee402dd1230e91faab793f08dba01ee56f5e28e82f43cdee1ad311448
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Filesize
976KB
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Filesize
64KB
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Filesize
40KB
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Filesize
48KB
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Filesize
40KB
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Filesize
32KB
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Filesize
40KB
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Filesize
48KB
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Filesize
48KB
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Filesize
4KB
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Filesize
64KB
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Filesize
9.9MB
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Filesize
976KB
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Filesize
9.9MB