Analysis
- max time kernel
149s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20260911-en - resource tags
arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
30/09/2026, 08:13
Static task
static1
2 signatures
Behavioral task
behavioral1
Sample
115年度預定稅務查核企業名單.exe
Resource
win10v2004-20260911-en
windows10-2004-x64
11 signatures
150 seconds
Behavioral task
behavioral2
Sample
event.dll
Resource
win10v2004-20260911-en
windows10-2004-x64
13 signatures
150 seconds
Behavioral task
behavioral3
Sample
event.dll
Resource
win11ltsc2024-20260911-en
windows11-ltsc_2024-x64
13 signatures
150 seconds
General
- Target event.dll
- Size 101KB
- Sample260930-j4lpvaysev
- SHA256 369fdbd5cb5b0b64537c4cada9e6f3bff936d73f638cbe6bbd2d4db9f882b053
- MD5 141b1552293f66024dc18feac7933d6e
- SHA1 2f9a957d696f56436adfb1d321c1115fe0f87009
- SHA512 83e4b3859c48929d45543130a69668cd46f042cff4367f21a977548821d362b44aa8692986b4d0ab179c84365deecbbfcbbafaa9be9b6c058495c23cfaad4b34
- SSDEEP 3072:2geqWBi+HscwIiCRnTKfsdDmf8FSrXihYLSV9eXYByYP21sD8ohWP8JqDmrC:2amKUVmf8FSrXihYLSV9eXYByYP21sD2
- TLSH T15FA324456574BCB8C526803D9207632253B23C4DC33266A7AAE5DE243F97FA06B3D7E1
- MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
Malware Config
Signatures
- Family: DonutLoader
DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.
- Detects DonutLoader 1 IoCs
resource yara_rule behavioral2/memory/4456-18-0x0000028154760000-0x0000028154E8B000-memory.dmp family_donutloader - Detects Overlord RAT 1 IoCs
resource yara_rule behavioral2/memory/4456-20-0x0000028158690000-0x000002815BA1E000-memory.dmp family_overlord - Badlisted process makes network request 7 IoCs
Network request originating from process or tool commonly abused by malware.
flow pid Process 25 4800 rundll32.exe 27 4800 rundll32.exe 30 4800 rundll32.exe 32 4800 rundll32.exe 34 4800 rundll32.exe 36 4800 rundll32.exe 38 4800 rundll32.exe - Executes dropped EXE 1 IoCs
pid Process 4140 ExplorerBroker.exe - Adds Run key to start application 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-1846164713-4096795028-774071693-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsUpdate_NKyl = "C:\\Users\\Admin\\AppData\\Local\\Microsoft\\Windows\\Explorer\\thumbcache_NKylaw0r\\ExplorerBroker.exe" rundll32.exe - Looks up external IP address via web service 1 TTPs 2 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 66 api.ipify.org 67 api.ipify.org - 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.
description ioc Process Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Domain rundll32.exe Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Tcpip\Parameters\Hostname rundll32.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 RuntimeBroker.exe Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString RuntimeBroker.exe - Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-1846164713-4096795028-774071693-1000\{75054B5F-E5FC-4C42-B648-5060C265B568} RuntimeBroker.exe Key created \REGISTRY\MACHINE\Software\Classes\Local Settings\Software\Microsoft\Windows\CurrentVersion\AppModel\Deployment\Package\*\S-1-5-21-1846164713-4096795028-774071693-1000\{394019C9-BD96-49CF-BB10-041F2CFB035C} RuntimeBroker.exe - Suspicious behavior: EnumeratesProcesses 4 IoCs
pid Process 4800 rundll32.exe 4800 rundll32.exe 4800 rundll32.exe 4800 rundll32.exe - Suspicious use of WriteProcessMemory 64 IoCs
description pid Process procid_target PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96 PID 4800 wrote to memory of 4456 4800 rundll32.exe 96
Processes
-
C:\Windows\system32\rundll32.exerundll32.exe C:\Users\Admin\AppData\Local\Temp\event.dll,#11⤵
- Badlisted process makes network request
- Adds Run key to start application
- Reads the TCP/IP host and domain name from the registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:4800 -
C:\Windows\system32\RuntimeBroker.exe"C:\Windows\system32\RuntimeBroker.exe"2⤵
- Checks processor information in registry
- Modifies registry class
PID:4456
-
-
C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_NKylaw0r\ExplorerBroker.exeC:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_NKylaw0r\ExplorerBroker.exe1⤵
- Executes dropped EXE
PID:4140
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
- Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Explorer\thumbcache_NKylaw0r\ExplorerBroker.exe
- Size 70KB
- SHA256 b53f3c0cd32d7f20849850768da6431e5f876b7bfa61db0aa0700b02873393fa
- MD5 ef3179d498793bf4234f708d3be28633
- SHA1 dd399ae46303343f9f0da189aee11c67bd868222
- SHA512 02aff154762d7e53e37754f878ce6aa3f4df5a1eb167e27f13d9762dced32bec892bfa3f3314e3c6dce5998f7d3c400d7d0314b9326eedcab72207c60b3d332e
- SSDEEP 1536:J8qpnO/qRUNReI3fu6Uw2mTARPw2cm+YRQln5IUmDjoX:C/YUNRBfukTreXRQln5I
- TLSH T16B630BC9A66460F4E077953444734E099272BC22D7625ADF54F0F17C0FF36E0A93AAAB
- MD5 SHA1 SHA512 SSDEEP TLSH