Analysis
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max time kernel
119s -
max time network
120s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
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submitted
07-11-2024 19:10
General
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Target
f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe
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Size
952KB
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MD5
2e9644402e12601f1d8161857c48a3ad
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SHA1
43b55976d438bc8273932f12a12b7f248165e8a9
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SHA256
f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b
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SHA512
4e1efd2ef2a9e9f062c3a9321cb28c34a56edc9b398e857eb3f14ecc6ded5660249a4523b8c21eccf3db524625b05ab1b075d7be20f68d0e27f91e7b403a1662
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SSDEEP
24576:Q+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:z8/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 5 IoCs
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Process spawned unexpected child process 5 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 4 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 10 IoCs
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Checks whether UAC is enabled 1 TTPs 4 IoCs
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Drops file in System32 directory 5 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 5 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\f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe"C:\Users\Admin\AppData\Local\Temp\f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 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:\PerfLogs\Admin\dllhost.exe"C:\PerfLogs\Admin\dllhost.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 "winlogon" /sc ONLOGON /tr "'C:\Recovery\1f276ee2-69f6-11ef-8b31-62cb582c238c\winlogon.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 "winlogon" /sc ONLOGON /tr "'C:\PerfLogs\Admin\winlogon.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 "dllhost" /sc ONLOGON /tr "'C:\PerfLogs\Admin\dllhost.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 "OSPPSVC" /sc ONLOGON /tr "'C:\Windows\PLA\Templates\OSPPSVC.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 "smss" /sc ONLOGON /tr "'C:\Windows\System32\stdole2\smss.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
Loading Replay Monitor...
Downloads
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Filesize
952KB
MD5e75ce634e9844c8ad616cc917d7bbbc3
SHA1f4fc9d2efa38604f848f1b11d5fffe88e7ad64c1
SHA2568b768d1ddeb801e5f13f9c62a029466af027f5d2422534ddea4bee809fd8ba07
SHA5121f8ad69d4c80903fe23c20edf0de17edcabca8785d5c47a2879c0a22a9aa7523b2075eb4a700107a379a3c78129ef4d12762faec6f9d04fc4998f592abca17df
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Filesize
952KB
MD52e9644402e12601f1d8161857c48a3ad
SHA143b55976d438bc8273932f12a12b7f248165e8a9
SHA256f7d1ba849bec5c9f1761a6b420f793fa7c350be0e66d40788cde74650bf8a20b
SHA5124e1efd2ef2a9e9f062c3a9321cb28c34a56edc9b398e857eb3f14ecc6ded5660249a4523b8c21eccf3db524625b05ab1b075d7be20f68d0e27f91e7b403a1662
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Filesize
40KB
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Filesize
40KB
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Filesize
4KB
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Filesize
48KB
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Filesize
40KB
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Filesize
64KB
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Filesize
48KB
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Filesize
64KB
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Filesize
48KB
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Filesize
32KB
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Filesize
9.9MB
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Filesize
976KB
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Filesize
9.9MB
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Filesize
976KB