Analysis
- max time kernel
149s - max time network
143s - platform
windows10-2004_x64 - resource
win10v2004-20260911-en - resource tags
- submitted
12/11/2026, 18:31
General
- Target PN Details.js
- Size 1.1MB
- Sample261112-w6caeaaa59
- SHA256 691c58ff848bdfc7a899dbde96428fb97e7c8f6dc026d4637e444095631a3cc7
Malware Config
Extracted
-
remcos
-
7.3.1 Pro
-
ALEXA
-
crazydns.bumbleshrimp.com:1192
-
audio_folder
MicRecords
-
audio_path
ApplicationPath
-
audio_record_time
5
-
connect_delay
0
-
connect_interval
1
-
copy_file
remcos.exe
-
copy_folder
Remcos
-
delete_file
false
-
hide_file
false
-
hide_keylog_file
false
-
install_flag
false
-
keylog_crypt
false
-
keylog_file
logs.dat
-
keylog_flag
false
-
keylog_folder
remcos
-
mouse_option
false
-
mutex
Rmc-RNZG2U
-
screenshot_crypt
false
-
screenshot_flag
false
-
screenshot_folder
Screenshots
-
screenshot_path
%AppData%
-
screenshot_time
10
-
take_screenshot_option
false
-
take_screenshot_time
5
Signatures
- Family: Remcos
Remcos is a closed-source remote control and surveillance software.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- 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.
- Executes dropped EXE 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Command and Scripting Interpreter: JavaScript 1 TTPs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- 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.
- System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs
Adversaries may check for Internet connectivity on compromised systems.
- Runs ping.exe 1 TTPs 1 IoCs
- Suspicious use of WriteProcessMemory 3 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
-
C:\Windows\system32\wscript.exewscript.exe "C:\Users\Admin\AppData\Local\Temp\PN Details.js"1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\PING.EXE"C:\Windows\System32\PING.EXE" -n 3 127.0.0.12⤵
- System Network Configuration Discovery: Internet Connection Discovery
- Runs ping.exe
-
-
C:\Windows\explorer.exe"C:\Windows\explorer.exe" "C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe"2⤵
-
-
C:\Windows\explorer.exeC:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe"C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe"2⤵
- Creates a file in the Startup directory
- Executes dropped EXE
- Adds Run key to start application
- Reads the TCP/IP host and domain name from the registry
-
-
C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe"C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe"1⤵
- Executes dropped EXE
-
C:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exeC:\Users\Admin\AppData\Local\DiskBackup\FontCore21.exe1⤵
- Executes dropped EXE
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
logs.dat
FontCore21.exe
FontCore21.exe.log
memory/2588-20-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-40-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-10-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-11-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-12-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-13-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-6-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-4-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-21-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-57-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-3-0x0000000000660000-0x00000000006DA000-memory.dmp
memory/2588-56-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-39-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-9-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-48-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/2588-49-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/3232-36-0x0000000140000000-0x00000001400AF000-memory.dmp
memory/3980-31-0x0000000140000000-0x00000001400AF000-memory.dmp