Analysis
- max time kernel
149s - max time network
151s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
- submitted
27/10/2026, 07:45
General
- Target xcuyb.exe
- Size 93KB
- Sample261027-jlmt7act2q
- SHA256 ae2c31c0799dd7d8b8a883dc4b87b2d5d86d2c2f91c3f425f1e58c3f72b9dfeb
Malware Config
Signatures
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Looks up external IP address via web service 1 TTPs 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
- Costura .NET executable packer 1 IoCs
Costura packer aka Costura Fody, is an add-in for the .NET framework that embeds all external dependency .dll files as resources inside main executable.
- Enumerates video capture drivers 2 TTPs 1 IoCs
Queries the legacy Video for Windows capture drivers. This is commonly abused by RATs to check for available webcams on the system before reporting to their C2.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
- System Location Discovery: System Language Discovery 1 TTPs 5 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 4 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\xcuyb.exe"C:\Users\Admin\AppData\Local\Temp\xcuyb.exe"1⤵
- Adds Run key to start application
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks.exe" /Delete /TN "WindowsAppManagerTask" /F2⤵
- System Location Discovery: System Language Discovery
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C:\Windows\SysWOW64\schtasks.exe"schtasks.exe" /Create /TN "WindowsAppManagerTask" /TR "\"C:\Users\Admin\AppData\Roaming\WindowsAppManager\winmgr.exe\"" /SC ONLOGON /RL LIMITED /F2⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
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C:\Users\Admin\AppData\Roaming\WindowsAppManager\winmgr.exe"C:\Users\Admin\AppData\Roaming\WindowsAppManager\winmgr.exe"2⤵
- Executes dropped EXE
- Enumerates video capture drivers
- Reads the TCP/IP host and domain name from the registry
- System Location Discovery: System Language Discovery
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exe"schtasks.exe" /Create /TN "WindowsAppManagerTask" /TR "\"C:\Users\Admin\AppData\Roaming\WindowsAppManager\winmgr.exe\"" /SC ONLOGON /RL LIMITED /F3⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
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Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
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Downloads
winmgr.exe
memory/3256-7-0x0000000074200000-0x00000000749BC000-memory.dmp
memory/3256-8-0x0000000074200000-0x00000000749BC000-memory.dmp
memory/3256-9-0x0000000074200000-0x00000000749BC000-memory.dmp
memory/3256-10-0x0000000074200000-0x00000000749BC000-memory.dmp
memory/3256-11-0x0000000004DB0000-0x0000000004DC6000-memory.dmp
memory/3256-12-0x0000000006520000-0x0000000006586000-memory.dmp
memory/3256-13-0x0000000007690000-0x000000000769C000-memory.dmp
memory/4900-0-0x0000000074212000-0x0000000074213000-memory.dmp
memory/4900-1-0x0000000000340000-0x000000000035E000-memory.dmp
memory/4900-2-0x00000000055F0000-0x0000000005BAA000-memory.dmp
memory/4900-3-0x0000000004E80000-0x0000000004F12000-memory.dmp