cnbackdoor | e52e65ed97e99d807394493f195bc62e5abe28db252fd060e3033bf6c2063e85

Analysis

max time kernel
149s
max time network
137s
platform
windows10-2004_x64
resource
win10v2004-20260911-en
resource tags

arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
08/10/2026, 21:07

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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

Score

10^/10

backdoor defense_evasion discovery execution cnbackdoor persistence privilege_escalation themida trojan

Malware Config

Signatures

Family: CNBackdoor
CNBackdoor aka CNB Bot is a backdoor that polls its C2 to download and execute additional malware.
backdoor cnbackdoor

Enumerates VirtualBox registry keys 2 TTPs 4 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\VBoxSF	services.exe
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

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\ACPI\DSDT\VBOX__	InstallerV41693X64.exe

Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

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 and hide display window.

execution

PowerShell

T1059.001

pid	Process
628	powershell.exe
4060	powershell.exe
628	powershell.exe

Looks for VMWare Tools registry key 2 TTPs 2 IoCs

defense_evasion

Query Registry

T1012

Virtualization/Sandbox Evasion

T1497

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	services.exe
Key opened	\REGISTRY\MACHINE\SOFTWARE\VMware, Inc.\VMware Tools	EstMsilTarget.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	InstallerV41693X64.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	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.

persistence privilege_escalation

Registry Run Keys / Startup Folder

T1547.001

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.

defense_evasion

Match Legitimate Name or Location

T1036.005

description	ioc	Process
File opened (read-only)	C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe	EstMsilTarget.exe
File opened (read-only)	C:\Users\Admin\AppData\Roaming\LocalContainer\EL548\services.exe	services.exe

Executes dropped EXE 2 IoCs

pid	Process
1520	EstMsilTarget.exe
2376	services.exe

Themida packer 3 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral1/memory/2120-8-0x0000000000400000-0x0000000001C16000-memory.dmp	themida
behavioral1/memory/2120-9-0x0000000000400000-0x0000000001C16000-memory.dmp	themida
behavioral1/memory/2120-64-0x0000000000400000-0x0000000001C16000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

T1082

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

defense_evasion

Debugger Evasion

T1622

pid	Process
2120	InstallerV41693X64.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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.

execution

Windows Command Shell

T1059.003

pid	Process
2560	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.

discovery

System Network Configuration Discovery

T1016

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.

Query Registry

T1012

System Information Discovery

T1082

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

defense_evasion

pid	Process
3724	timeout.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
628	powershell.exe
628	powershell.exe
4060	powershell.exe
4060	powershell.exe
1520	EstMsilTarget.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe
2376	services.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	2120	InstallerV41693X64.exe
Token: SeDebugPrivilege	628	powershell.exe
Token: SeDebugPrivilege	4060	powershell.exe
Token: SeDebugPrivilege	1520	EstMsilTarget.exe
Token: SeDebugPrivilege	2376	services.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2120 wrote to memory of 628	2120	InstallerV41693X64.exe	89
PID 2120 wrote to memory of 4060	2120	InstallerV41693X64.exe	99
PID 4060 wrote to memory of 1520	4060	powershell.exe	101
PID 1520 wrote to memory of 2376	1520	EstMsilTarget.exe	102
PID 1520 wrote to memory of 2560	1520	EstMsilTarget.exe	103
PID 2560 wrote to memory of 3724	2560	cmd.exe	105

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:2120
- 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:628
- 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:4060
- - 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:1520
  - - 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:2376
  - - C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\rzy0svne.bat""
      4⤵
      Executes a command shell one-liner
      Suspicious use of WriteProcessMemory
      PID:2560
    - - C:\Windows\system32\timeout.exe
        
        timeout /t 3 /nobreak
        5⤵
        Delays execution with timeout.exe
        
        PID:3724

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Windows Command Shell

T1059.003

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Debugger Evasion

T1622

Masquerading

T1036

Match Legitimate Name or Location

T1036.005

Virtualization/Sandbox Evasion

T1497

Credential Access

Discovery

Debugger Evasion

T1622

Query Registry

T1012

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
TLSH
T1CE51EE323375B1E888167F071E681A8053BF4355EA94AF1CB698621ED93641B9F222F3
MD5 SHA1 SHA512 TLSH

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 a9c2268a32d4b53421c510878be105729a41bb03d01622456369d322e3e35c5e
MD5 ffaa33c7940b1713a06a430414e2fed0
SHA1 b1ade7d02b641ac9c382fad82cb1d31362fafb91
SHA512 61913fe437de06bae8a99a02f3ff35f483d06ddd9593c16f9bb652dde94930ff47f1a07765b2d78ac5108abb65837a66444dc7ff9691ba9c9ceaf85f0ae73f4d
TLSH
T17C112223F38C8920CC96163A509DAC5172B686CB81AEDF9F7FC0D210A1BF584CB61294
MD5 SHA1 SHA512 TLSH

Submit Download

EstMsilTarget.exe

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

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__PSScriptPolicyTest_gs555dfc.xpt.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gs555dfc.xpt.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

Submit Download

rzy0svne.bat

Path C:\Users\Admin\AppData\Local\Temp\rzy0svne.bat
Size 210B
SHA256 93e9fb5cf582630ba5669606b6c109639b9975df32afe5964e0aff00969b82b6
MD5 507c367f2440312e4dc8332e08bfb9e2
SHA1 f27abd617323b279cb13cf8b72c96b8290971e75
SHA512 c30f9383c0a482c219aa40553872527cfee3b971ea6213b2882a371ff327c3fdf15a28d01ee62be354f00314c2d9adf232334169bee155ee6462d5255e67d0cd
TLSH
T188D0124D718F9BC50404247A4ABF609DA0E948A61E4D76835675A0FDA38701EF6D77C3
MD5 SHA1 SHA512 TLSH

Submit Download

install.dat

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

Submit Download

memory/628-23-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/628-11-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/628-14-0x0000014996C00000-0x0000014996C22000-memory.dmp

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memory/628-22-0x00000149AFD40000-0x00000149AFF5C000-memory.dmp

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memory/1520-41-0x0000023237990000-0x0000023237A1C000-memory.dmp

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memory/1520-49-0x00000232397B0000-0x00000232397CE000-memory.dmp

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memory/1520-47-0x0000023252180000-0x00000232521F6000-memory.dmp

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memory/1520-44-0x0000023237E50000-0x0000023237EA4000-memory.dmp

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memory/2120-0-0x0000000000400000-0x0000000001C16000-memory.dmp

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memory/2120-27-0x000000001ED90000-0x000000001F922000-memory.dmp

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memory/2120-8-0x0000000000400000-0x0000000001C16000-memory.dmp

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memory/2120-4-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-3-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-25-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-24-0x0000000000400000-0x0000000001C16000-memory.dmp

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memory/2120-10-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-9-0x0000000000400000-0x0000000001C16000-memory.dmp

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memory/2120-2-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-1-0x00007FF929774000-0x00007FF929775000-memory.dmp

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memory/2120-63-0x00007FF929710000-0x00007FF9299D9000-memory.dmp

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memory/2120-64-0x0000000000400000-0x0000000001C16000-memory.dmp

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