Resubmissions
12/08/2026, 02:55
260812-dera5sxdqe712/08/2026, 01:33
260812-byvfsswfjc710/08/2026, 07:45
260810-jlw3vsdm3x5Analysis
- geolocation tags
- user interaction
yes - max time kernel
129s - max time network
151s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-ja - resource tags
- submitted
12/08/2026, 02:55
General
- Target RKM-20260810-1514/Tax_Notice_43381.iso
- Size 364KB
- Sample260812-dera5sxdqe
- SHA256 cb9bdee13ee2f66931db0b2dbaf8f3fae1b40e15e7157a7131abc8e6b908d5e0
Malware Config
Signatures
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 1 IoCs
- Adds Run key to start application 2 TTPs 2 IoCs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Enumerates connected drives 3 TTPs 21 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- 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.
- Modifies registry class 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of SetWindowsHookEx 2 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.
- Uses Volume Shadow Copy WMI provider
The Volume Shadow Copy service is used to manage backups/snapshots.
Processes
-
C:\Windows\system32\cmd.execmd /c C:\Users\Admin\AppData\Local\Temp\RKM-20260810-1514\Tax_Notice_43381.iso1⤵
- Executes a command shell one-liner
- Modifies registry class
-
C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵
-
\??\D:\Tax_Notice_43381.exe"D:\Tax_Notice_43381.exe"1⤵
- Adds Run key to start application
- Suspicious use of SetWindowsHookEx
-
C:\Users\Admin\AppData\Roaming\Microsoft\Crypto\RuntimeBroker\RuntimeBroker.exeC:\Users\Admin\AppData\Roaming\Microsoft\Crypto\RuntimeBroker\RuntimeBroker.exe1⤵
- Executes dropped EXE
- Loads dropped DLL
- Adds Run key to start application
- Enumerates connected drives
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
LexiconBlob.dat
UserLexicon.ini
UserLexicon.ini
UserLexicon.ini
UserLexicon.ini
RuntimeBroker.exe
nvml.dll
memory/2784-25-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-50-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-131-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-16-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-17-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-125-0x00007FFF7E670000-0x00007FFF7E677000-memory.dmp
memory/2784-108-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-10-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-47-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-21-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-24-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-7-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-49-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-48-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-6-0x00000000008B0000-0x0000000000931000-memory.dmp
memory/2784-15-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-32-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-34-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-0-0x00007FFF86920000-0x00007FFF86B83000-memory.dmp
memory/2784-38-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/2784-39-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-51-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-55-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-57-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-59-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-53-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-52-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-1-0x00000000001F0000-0x00000000001F1000-memory.dmp
memory/2784-54-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-56-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-58-0x0000000003410000-0x000000000351A000-memory.dmp
memory/2784-65-0x0000000000980000-0x00000000009B7000-memory.dmp
memory/6040-88-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-83-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-81-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-80-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-79-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-78-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-77-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-71-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-82-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-84-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-85-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-63-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-62-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-61-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-60-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-86-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-87-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-89-0x00000000038F0000-0x00000000039F3000-memory.dmp
memory/6040-91-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-31-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-30-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-26-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-19-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-20-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-107-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-18-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-14-0x0000000000AA0000-0x0000000000AD7000-memory.dmp
memory/6040-130-0x00007FFF7E660000-0x00007FFF7E667000-memory.dmp
memory/6040-4-0x00007FFF86920000-0x00007FFF86B83000-memory.dmp