Analysis
- max time kernel
149s - max time network
147s - platform
windows11-21h2_x64 - resource
win11-20250619-en - resource tags
- submitted
09/12/2025, 14:56
General
- Target Nethost.exe
- Size 202KB
- Sample251209-sa6mlaykbt
- SHA256 f45a6d43567cd16366814f38f8ffd6de6be375c2a9502c447db1ff25b4307204
Malware Config
Extracted
-
nanocore
-
1.2.2.0
-
safevpnconnection.anondns.net:38953
-
127.0.0.1:38953
-
84276439-4b99-43f1-91a4-8782ad28fe37
-
activate_away_mode
true
-
backup_connection_host
127.0.0.1
-
backup_dns_server
8.8.4.4
-
buffer_size
65535
-
build_time
2024-08-13T17:32:33.896180736Z
-
bypass_user_account_control
true
- bypass_user_account_control_data
-
clear_access_control
true
-
clear_zone_identifier
false
-
connect_delay
4000
-
connection_port
38953
-
default_group
New Connections
-
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
84276439-4b99-43f1-91a4-8782ad28fe37
-
mutex_timeout
5000
-
prevent_system_sleep
false
-
primary_connection_host
safevpnconnection.anondns.net
-
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
- NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
- Nanocore family
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Drops file in Program Files directory 2 IoCs
- System Location Discovery: System Language Discovery 1 TTPs 2 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Suspicious behavior: EnumeratesProcesses 36 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\Nethost.exe"C:\Users\Admin\AppData\Local\Temp\Nethost.exe"1⤵
- 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)\IMAP Subsystem\imapss.exe"C:\Program Files (x86)\IMAP Subsystem\imapss.exe"1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
imapss.exe
memory/240-0-0x0000000075281000-0x0000000075282000-memory.dmp
memory/240-1-0x0000000075280000-0x0000000075831000-memory.dmp
memory/240-4-0x0000000075280000-0x0000000075831000-memory.dmp
memory/240-11-0x0000000075280000-0x0000000075831000-memory.dmp
memory/240-12-0x0000000075280000-0x0000000075831000-memory.dmp
memory/1648-7-0x0000000075280000-0x0000000075831000-memory.dmp
memory/1648-8-0x0000000075280000-0x0000000075831000-memory.dmp
memory/1648-10-0x0000000075280000-0x0000000075831000-memory.dmp