Analysis
- max time kernel
153s - max time network
167s - platform
windows10-2004_x64 - resource
win10v2004-20220812-en - resource tags
- submitted
26/11/2022, 07:31
General
- Target ee732fe083d094477408b867d673fa9ce9b443099a3a9178362f2cf032297224.exe
- Size 776KB
- Sample221126-jclkrscc22
- SHA256 ee732fe083d094477408b867d673fa9ce9b443099a3a9178362f2cf032297224
Malware Config
Extracted
-
nanocore
-
1.2.1.1
-
mrsaix.noip.me:9033
-
92c248cc-2654-43ec-876f-26667c552790
-
activate_away_mode
true
- backup_connection_host
- backup_dns_server
-
buffer_size
65535
-
build_time
2014-11-01T23:50:25.731419836Z
-
bypass_user_account_control
true
- bypass_user_account_control_data
-
clear_access_control
true
-
clear_zone_identifier
false
-
connect_delay
4000
-
connection_port
9033
-
default_group
Default
-
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
92c248cc-2654-43ec-876f-26667c552790
-
mutex_timeout
5000
-
prevent_system_sleep
false
-
primary_connection_host
mrsaix.noip.me
- primary_dns_server
-
request_elevation
true
-
restart_delay
5000
-
run_delay
0
-
run_on_startup
true
-
set_critical_process
true
-
timeout_interval
5000
-
use_custom_dns_server
false
-
version
1.2.1.1
-
wan_timeout
8000
Signatures
- NanoCore
NanoCore is a remote access tool (RAT) with a variety of capabilities.
- Executes dropped EXE 3 IoCs
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Adds Run key to start application 2 TTPs 4 IoCs
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Modifies registry class 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious behavior: GetForegroundWindowSpam 1 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 14 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\ee732fe083d094477408b867d673fa9ce9b443099a3a9178362f2cf032297224.exe"C:\Users\Admin\AppData\Local\Temp\ee732fe083d094477408b867d673fa9ce9b443099a3a9178362f2cf032297224.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\WindowsUpdate\Update\winupdate.exe"C:\Users\Admin\AppData\Roaming\WindowsUpdate\Update\winupdate.exe"2⤵
- Executes dropped EXE
- Checks computer location settings
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\WinUpdate.exe"C:\Users\Admin\AppData\Roaming\WinUpdate.exe"3⤵
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Users\Admin\AppData\Roaming\csrss.exe"C:\Users\Admin\AppData\Roaming\csrss.exe" -reg C:\Users\Admin\AppData\Roaming\WindowsUpdate\Update\winupdate.exe -proc 5004 C:\Users\Admin\AppData\Roaming\WindowsUpdate\Update\winupdate.exe3⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
WinUpdate.exe
WinUpdate.exe
winupdate.exe
winupdate.exe
csrss.exe
csrss.exe
memory/2280-152-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/2280-150-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4244-136-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4244-132-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4336-149-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/4336-137-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/5004-140-0x0000000000400000-0x0000000000438000-memory.dmp
memory/5004-145-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/5004-141-0x0000000000400000-0x0000000000438000-memory.dmp
memory/5004-151-0x00000000750D0000-0x0000000075681000-memory.dmp
memory/5004-139-0x0000000000400000-0x0000000000438000-memory.dmp