Resubmissions
15/09/2026, 11:29
260915-nlkgaatzg107/08/2026, 14:21
260807-rn2ecsfm2v1007/08/2026, 14:20
260807-rnv8cazwds06/08/2026, 22:19
260806-18tppa1gqf1006/08/2026, 22:01
260806-1w8m3svsfz1006/08/2026, 03:44
260806-ear8baff461010/07/2026, 00:11
260710-agy7zsct5t10Analysis
- max time kernel
298s - max time network
307s - platform
windows11-ltsc_2024_x64 - resource
win11ltsc2024-20260709-en - resource tags
- submitted
07/08/2026, 14:21
General
- Target 1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480.exe
- Size 291KB
- Sample260807-rn2ecsfm2v
- SHA256 1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480
Malware Config
Extracted
-
nanocore
-
1.2.2.0
-
u852117.nvpn.so:5638
-
31a1bd10-70b4-4419-9b7f-75dbc4160d94
-
activate_away_mode
true
-
backup_connection_host
u852117.nvpn.so
-
backup_dns_server
8.8.4.4
-
buffer_size
65535
-
build_time
2020-02-11T21:26:44.406621436Z
-
bypass_user_account_control
true
- bypass_user_account_control_data
-
clear_access_control
true
-
clear_zone_identifier
false
-
connect_delay
4000
-
connection_port
5638
-
default_group
NEW COMCASTED
-
enable_debug_mode
true
-
gc_threshold
1.048576e+07
-
keep_alive_timeout
30000
-
keyboard_logging
false
-
lan_timeout
2500
-
max_packet_size
1.048576e+07
-
mutex
31a1bd10-70b4-4419-9b7f-75dbc4160d94
-
mutex_timeout
5000
-
prevent_system_sleep
false
-
primary_connection_host
u852117.nvpn.so
-
primary_dns_server
8.8.8.8
-
request_elevation
true
-
restart_delay
5000
-
run_delay
0
-
run_on_startup
false
-
set_critical_process
true
-
timeout_interval
5000
-
use_custom_dns_server
false
-
version
1.2.2.0
-
wan_timeout
8000
Signatures
- Family: NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
- Executes dropped EXE 2 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Suspicious use of SetThreadContext 2 IoCs
- Drops file in Program Files directory 1 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 4 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 10 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480.exe"C:\Users\Admin\AppData\Local\Temp\1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480.exe"1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480.exeC:\Users\Admin\AppData\Local\Temp\1fbae4f859c40f9446d06e76a4acf496fe0a43fb93b87f87d1077ab8a4490480.exe2⤵
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Program Files (x86)\SMTP Monitor\smtpmon.exe"C:\Program Files (x86)\SMTP Monitor\smtpmon.exe"1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
-
C:\Program Files (x86)\SMTP Monitor\smtpmon.exe"C:\Program Files (x86)\SMTP Monitor\smtpmon.exe"2⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
-
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
smtpmon.exe
memory/1440-16-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/1440-19-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/1440-20-0x0000000004C60000-0x0000000004D50000-memory.dmp
memory/1440-15-0x0000000000D00000-0x0000000000D1B000-memory.dmp
memory/2540-5-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/2540-12-0x0000000005F70000-0x0000000005F8E000-memory.dmp
memory/2540-7-0x0000000005A10000-0x0000000005AAC000-memory.dmp
memory/2540-8-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/2540-9-0x0000000005880000-0x000000000588A000-memory.dmp
memory/2540-11-0x00000000058E0000-0x00000000058EA000-memory.dmp
memory/2540-13-0x0000000005F90000-0x0000000005F9A000-memory.dmp
memory/2540-6-0x0000000005900000-0x0000000005992000-memory.dmp
memory/2540-23-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/2540-22-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/2540-4-0x0000000005FD0000-0x000000000658A000-memory.dmp
memory/2540-2-0x0000000000400000-0x0000000000438000-memory.dmp
memory/5844-1-0x00000000003E0000-0x00000000003FB000-memory.dmp
memory/5844-3-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/5844-21-0x0000000074D80000-0x000000007553C000-memory.dmp
memory/5844-0-0x0000000074D92000-0x0000000074D93000-memory.dmp