Analysis
- max time kernel
150s - max time network
142s - platform
windows10-2004_x64 - resource
win10v2004-20241007-en - resource tags
- submitted
23/12/2024, 01:14
General
- Target e635ffdeb402924e63d04502f88b9cb53697f7fd3be91af4906a811502970abc.exe
- Size 924KB
- Sample241223-bl2pcatjby
- SHA256 e635ffdeb402924e63d04502f88b9cb53697f7fd3be91af4906a811502970abc
Malware Config
Extracted
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orcus
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testbuild
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127.0.0.1:1268
-
979c2ee9d7ff48d0a2e4e2df3c2c864d
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autostart_method
Registry
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enable_keylogger
true
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install_path
%programfiles%\Common Files\System\HD Audio\HDAudio.exe
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reconnect_delay
10000
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registry_keyname
HDAudioDriver
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taskscheduler_taskname
HDAudioDriver
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watchdog_path
AppData\HDAudioWatchdog.exe
Signatures
- Orcus
Orcus is a Remote Access Trojan that is being sold on underground forums.
- Orcus family
- Orcus main payload 1 IoCs
- Orcurs Rat Executable 2 IoCs
- Checks computer location settings 2 TTPs 3 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 6 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Drops file in System32 directory 3 IoCs
- Drops file in Program Files directory 3 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 3 IoCs
- Suspicious use of SetWindowsHookEx 1 IoCs
- Suspicious use of WriteProcessMemory 10 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
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C:\Users\Admin\AppData\Local\Temp\e635ffdeb402924e63d04502f88b9cb53697f7fd3be91af4906a811502970abc.exe"C:\Users\Admin\AppData\Local\Temp\e635ffdeb402924e63d04502f88b9cb53697f7fd3be91af4906a811502970abc.exe"1⤵
- Checks computer location settings
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\WindowsInput.exe"C:\Windows\SysWOW64\WindowsInput.exe" --install2⤵
- Executes dropped EXE
- Drops file in System32 directory
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C:\Program Files\Common Files\System\HD Audio\HDAudio.exe"C:\Program Files\Common Files\System\HD Audio\HDAudio.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\HDAudioWatchdog.exe"C:\Users\Admin\AppData\Roaming\HDAudioWatchdog.exe" /launchSelfAndExit "C:\Program Files\Common Files\System\HD Audio\HDAudio.exe" 11363⤵
- Checks computer location settings
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\HDAudioWatchdog.exe"C:\Users\Admin\AppData\Roaming\HDAudioWatchdog.exe" /watchProcess "C:\Program Files\Common Files\System\HD Audio\HDAudio.exe" 11364⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\WindowsInput.exe"C:\Windows\SysWOW64\WindowsInput.exe"1⤵
- Executes dropped EXE
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C:\Program Files\Common Files\System\HD Audio\HDAudio.exe"C:\Program Files\Common Files\System\HD Audio\HDAudio.exe"1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
HDAudio.exe
err_979c2ee9d7ff48d0a2e4e2df3c2c864d.dat
HDAudioWatchdog.exe
WindowsInput.exe
WindowsInput.exe.config
memory/228-69-0x0000000000020000-0x0000000000028000-memory.dmp
memory/1136-51-0x000000001BA10000-0x000000001BA5E000-memory.dmp
memory/1136-53-0x000000001B690000-0x000000001B6A8000-memory.dmp
memory/1136-54-0x000000001C0B0000-0x000000001C272000-memory.dmp
memory/1136-55-0x000000001B7F0000-0x000000001B800000-memory.dmp
memory/3876-26-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp
memory/3876-31-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp
memory/3876-27-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp
memory/3876-25-0x0000000000470000-0x000000000047C000-memory.dmp
memory/4620-6-0x0000000000D60000-0x0000000000D68000-memory.dmp
memory/4620-10-0x000000001B750000-0x000000001B85A000-memory.dmp
memory/4620-9-0x000000001B3A0000-0x000000001B3DC000-memory.dmp
memory/4620-8-0x000000001B230000-0x000000001B242000-memory.dmp
memory/4620-48-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp
memory/4620-7-0x00000000026A0000-0x00000000026A8000-memory.dmp
memory/4620-0-0x00007FFBAC563000-0x00007FFBAC565000-memory.dmp
memory/4620-5-0x0000000002690000-0x00000000026A2000-memory.dmp
memory/4620-4-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp
memory/4620-3-0x0000000000D30000-0x0000000000D3E000-memory.dmp
memory/4620-2-0x00000000027D0000-0x000000000282C000-memory.dmp
memory/4620-1-0x00000000004B0000-0x000000000059E000-memory.dmp