Analysis
- max time kernel
150s - max time network
127s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260911-en - resource tags
arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows - submitted
08/10/2026, 21:07
Behavioral task
behavioral1
Sample
InstallerV41693X64.exe
Resource
win10v2004-20260911-en
Behavioral task
behavioral2
Sample
InstallerV41693X64.exe
Resource
win11ltsc2024-20260911-en
General
- Target InstallerV41693X64.exe
- Size 16.2MB
- Sample261008-zyemcagg38
- SHA256 e52e65ed97e99d807394493f195bc62e5abe28db252fd060e3033bf6c2063e85
- MD5 43992ed63b048e2009585b4938200df2
- SHA1 3432582e18fb8a8522984003e64c1466275094ac
- SHA512 a5c7fd65f39cbe8bf92178265a1a9907c6dde6e8730213a8e5fe5274f0565ae9b8ca675ae81c6603a434438a23830667e3ec65d9fd6ce52abc5109b77affbacf
- SSDEEP 393216:cFYfzxcqnNUcwbY0geuJC9WeZxw8mpfyn3Jf5zMkUpJFDf:KKqSNgBSCAeCC/zaLx
- TLSH T1540733F424F48255EECD6274855611A299216337FFA3A077F8530F7828D21B7FB01ABA
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Signatures
- Family: CNBackdoor
CNBackdoor aka CNB Bot is a backdoor that polls its C2 to download and execute additional malware.
- Enumerates VirtualBox registry keys 2 TTPs 4 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxGuest EstMsilTarget.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxSF EstMsilTarget.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxGuest services.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxSF services.exe - Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__ InstallerV41693X64.exe - Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions EstMsilTarget.exe Key opened \REGISTRY\MACHINE\SOFTWARE\Oracle\VirtualBox Guest Additions services.exe - Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
pid Process 4456 powershell.exe 4456 powershell.exe 1868 powershell.exe - Looks for VMWare Tools registry key 2 TTPs 2 IoCs
description ioc Process Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools EstMsilTarget.exe Key opened \REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools services.exe - Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
description ioc Process Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion InstallerV41693X64.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion InstallerV41693X64.exe - Creates a file in the Startup directory 1 TTPs 1 IoCs
A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\LocalContainer.lnk EstMsilTarget.exe - Executes a file named after a Windows system binary 1 TTPs 2 IoCs
The file runs from a user directory while carrying the name of an executable that normally only exists in System32.
description ioc Process File opened (read-only) C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe services.exe File opened (read-only) C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe EstMsilTarget.exe - Executes dropped EXE 2 IoCs
pid Process 3488 EstMsilTarget.exe 3448 services.exe -
resource yara_rule behavioral2/memory/2876-8-0x0000000000400000-0x0000000001C16000-memory.dmp themida behavioral2/memory/2876-9-0x0000000000400000-0x0000000001C16000-memory.dmp themida behavioral2/memory/2876-65-0x0000000000400000-0x0000000001C16000-memory.dmp themida - Checks whether UAC is enabled 1 TTPs 1 IoCs
description ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA InstallerV41693X64.exe - Suspicious use of NtSetInformationThreadHideFromDebugger 1 TTPs 1 IoCs
pid Process 2876 InstallerV41693X64.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 4732 cmd.exe - Reads the TCP/IP host and domain name from the registry 1 TTPs 4 IoCs
The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.
description ioc Process Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname EstMsilTarget.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain EstMsilTarget.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname services.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain services.exe - Checks processor information in registry 2 TTPs 2 IoCs
Processor information is often read in order to detect sandboxing environments.
description ioc Process Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 services.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString services.exe - Delays execution with timeout.exe 1 IoCs
pid Process 4764 timeout.exe - Suspicious behavior: EnumeratesProcesses 35 IoCs
pid Process 4456 powershell.exe 4456 powershell.exe 1868 powershell.exe 1868 powershell.exe 3488 EstMsilTarget.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe 3448 services.exe - Suspicious use of AdjustPrivilegeToken 47 IoCs
description pid Process Token: SeDebugPrivilege 2876 InstallerV41693X64.exe Token: SeDebugPrivilege 4456 powershell.exe Token: SeIncreaseQuotaPrivilege 4456 powershell.exe Token: SeSecurityPrivilege 4456 powershell.exe Token: SeTakeOwnershipPrivilege 4456 powershell.exe Token: SeLoadDriverPrivilege 4456 powershell.exe Token: SeSystemProfilePrivilege 4456 powershell.exe Token: SeSystemtimePrivilege 4456 powershell.exe Token: SeProfSingleProcessPrivilege 4456 powershell.exe Token: SeIncBasePriorityPrivilege 4456 powershell.exe Token: SeCreatePagefilePrivilege 4456 powershell.exe Token: SeBackupPrivilege 4456 powershell.exe Token: SeRestorePrivilege 4456 powershell.exe Token: SeShutdownPrivilege 4456 powershell.exe Token: SeDebugPrivilege 4456 powershell.exe Token: SeSystemEnvironmentPrivilege 4456 powershell.exe Token: SeRemoteShutdownPrivilege 4456 powershell.exe Token: SeUndockPrivilege 4456 powershell.exe Token: SeManageVolumePrivilege 4456 powershell.exe Token: 33 4456 powershell.exe Token: 34 4456 powershell.exe Token: 35 4456 powershell.exe Token: 36 4456 powershell.exe Token: SeIncreaseQuotaPrivilege 4456 powershell.exe Token: SeSecurityPrivilege 4456 powershell.exe Token: SeTakeOwnershipPrivilege 4456 powershell.exe Token: SeLoadDriverPrivilege 4456 powershell.exe Token: SeSystemProfilePrivilege 4456 powershell.exe Token: SeSystemtimePrivilege 4456 powershell.exe Token: SeProfSingleProcessPrivilege 4456 powershell.exe Token: SeIncBasePriorityPrivilege 4456 powershell.exe Token: SeCreatePagefilePrivilege 4456 powershell.exe Token: SeBackupPrivilege 4456 powershell.exe Token: SeRestorePrivilege 4456 powershell.exe Token: SeShutdownPrivilege 4456 powershell.exe Token: SeDebugPrivilege 4456 powershell.exe Token: SeSystemEnvironmentPrivilege 4456 powershell.exe Token: SeRemoteShutdownPrivilege 4456 powershell.exe Token: SeUndockPrivilege 4456 powershell.exe Token: SeManageVolumePrivilege 4456 powershell.exe Token: 33 4456 powershell.exe Token: 34 4456 powershell.exe Token: 35 4456 powershell.exe Token: 36 4456 powershell.exe Token: SeDebugPrivilege 1868 powershell.exe Token: SeDebugPrivilege 3488 EstMsilTarget.exe Token: SeDebugPrivilege 3448 services.exe - Suspicious use of WriteProcessMemory 6 IoCs
description pid Process procid_target PID 2876 wrote to memory of 4456 2876 InstallerV41693X64.exe 90 PID 2876 wrote to memory of 1868 2876 InstallerV41693X64.exe 93 PID 1868 wrote to memory of 3488 1868 powershell.exe 95 PID 3488 wrote to memory of 3448 3488 EstMsilTarget.exe 97 PID 3488 wrote to memory of 4732 3488 EstMsilTarget.exe 98 PID 4732 wrote to memory of 4764 4732 cmd.exe 100
Processes
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C:\Users\Admin\AppData\Local\Temp\InstallerV41693X64.exe"C:\Users\Admin\AppData\Local\Temp\InstallerV41693X64.exe"1⤵
- Identifies VirtualBox via ACPI registry values (likely anti-VM)
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2876 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath @('C:\Users\Admin\AppData\Local\Temp\','C:\Users\Admin\AppData\Local\Temp\InstallerV41693X64.exe','C:\Users\Admin\AppData\Local','C:\Users\Admin\AppData\Roaming','C:\Users\Admin\AppData\Local','C:\Users\Admin\AppData\Roaming','RuntimeBroker.exe','AppLaunch.exe','dwm.exe','svchost.exe','explorer.exe','services.exe','schtasks.exe','conhost.exe'); Add-MpPreference -ExclusionProcess @('C:\Users\Admin\AppData\Local\Temp\InstallerV41693X64.exe','RuntimeBroker.exe','InstallUtil.exe','AppLaunch.exe','dwm.exe','svchost.exe','explorer.exe','services.exe','schtasks.exe','conhost.exe','wscript.exe','concheck.exe','pathmsil.exe','ioextender.exe','EstMsilTarget.exe')"2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4456
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" -WindowStyle Hidden Start-Process 'C:\Users\Admin\AppData\Local\Temp\\EstMsilTarget.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1868 -
C:\Users\Admin\AppData\Local\Temp\EstMsilTarget.exe"C:\Users\Admin\AppData\Local\Temp\EstMsilTarget.exe"3⤵
- Enumerates VirtualBox registry keys
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Creates a file in the Startup directory
- Executes a file named after a Windows system binary
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3488 -
C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe"C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe"4⤵
- Enumerates VirtualBox registry keys
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Executes a file named after a Windows system binary
- Executes dropped EXE
- Reads the TCP/IP host and domain name from the registry
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3448
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\g7f3jrha.bat""4⤵
- Executes a command shell one-liner
- Suspicious use of WriteProcessMemory
PID:4732 -
C:\Windows\system32\timeout.exetimeout /t 3 /nobreak5⤵
- Delays execution with timeout.exe
PID:4764
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Network
MITRE ATT&CK Enterprise v16
Execution
Command and Scripting Interpreter
2PowerShell
1Windows Command Shell
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Debugger Evasion
1Masquerading
1Match Legitimate Name or Location
1Virtualization/Sandbox Evasion
4Replay Monitor
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Downloads
- Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
- Size 1KB
- SHA256 d28ef187840dcd1fe0a8a757ef9cd326023bec38b39ef1338f91d508d55dcf28
- MD5 acbc65123954839a819fa2495d239bf7
- SHA1 063cff64444a6e3b4be1445b4cecb477e4d6ae47
- SHA512 af07d3f6dcf1779bcc864aabe9e08563b20b8df8238df7bb08a5fe3b4e40d10f2e2a4442a042fe5d7a320e3b8195799ecc885549faa8babb5909eb32271e7b91
- TLSH T170216833B3DD8615CC9A413A10CDAC1036B6C7DB40DECFAB7B84E655A43F699CE61160
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\EstMsilTarget.exe
- Size 543KB
- SHA256 271710733319af12fba0efc5ee4dcb3105796b2e8ca936650c7b5474379bd086
- MD5 548f7366b54d10ba1cd897331d1543d0
- SHA1 c6f56b927c8ff68d09cd006fb1d2db01f04e939f
- SHA512 7a1d4512d572abfc681bd31fe7cf492ad0128f462b0fc45ba8b657734f79fa946b4d99304e643a2abd236099a6a95b3ae09e434011eee3e3f760df665aa41f58
- SSDEEP 6144:3lhvUON4buIylqpJSIQ1vsP5QonH3YWVtmhRUdzn7dBXqR1WC0Kye3diLAUgffdc:11Gylqps3MRtCC9nyTf3d0AZ5/
- TLSH T1E5C46B57B64A4D21C1A89733D9E7800063F49A83B2B7D709788913DA5D077BFEC8E687
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_yuorkmw0.1ve.psm1
- Size 60B
- SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
- MD5 d17fe0a3f47be24a6453e9ef58c94641
- SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
- SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
- TLSH T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\g7f3jrha.bat
- Size 210B
- SHA256 93e9fb5cf582630ba5669606b6c109639b9975df32afe5964e0aff00969b82b6
- MD5 507c367f2440312e4dc8332e08bfb9e2
- SHA1 f27abd617323b279cb13cf8b72c96b8290971e75
- SHA512 c30f9383c0a482c219aa40553872527cfee3b971ea6213b2882a371ff327c3fdf15a28d01ee62be354f00314c2d9adf232334169bee155ee6462d5255e67d0cd
- TLSH T188D0124D718F9BC50404247A4ABF609DA0E948A61E4D76835675A0FDA38701EF6D77C3
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\install.dat
- Size 64B
- SHA256 7fc8f0c54a03aee1f7827ea36822601b57e35725dc3d05a74c6e895bfc202cdb
- MD5 5bf13e3bda1aca2d2929f65437d9b465
- SHA1 767bce627bf563c9fb4687a6f57305b49d1bf48c
- SHA512 1d194679e88c283471f06d303e3e78ff58a3a8d43cb1da7df6cda640e6ae6c633636771cadd5e9446333669742c45360ad1398d992ede871f60bf4484a2a310d
- TLSH T14AA00254A6CFCA69B905819B1FB7904888B68B466BE53E45A794E85895C084CE481012
- MD5 SHA1 SHA512 TLSH