nanocore | 1a4b1c047ded5964712cd991a2f2a22febcaa4d4b30d6905784207665506b30e

Analysis

user interaction
yes
max time kernel
148s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20260513-en
resource tags

arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
submitted
31/07/2026, 04:27

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General

Target
erpc.io.exe
Size 203KB
Sample260731-e28pdawscx
SHA256 1a4b1c047ded5964712cd991a2f2a22febcaa4d4b30d6905784207665506b30e
MD5 e53732988cb12dfdb35c85351cd2b34b
SHA1 07bc9da1523442d64a2534b6b35be81dbc113206
SHA512 678a3473cb3a3fc0f9e2f17e1ca15939c55efff91d3f4e55bdfa04eedafa2432579359c61d686ee8f039c1ebc1a6181d293be66acd0aaa0ce7012e3cb526b0c7
SSDEEP 6144:MLV6Bta6dtJmakIM5JR/4/hpQBhhVLy7J:MLV6BtpmkmR/4/UBh21
TLSH
T12A14CF163BA88A3FE2CE8679611212139379C2E398D3F3DE18D455B79F267E50A071C7
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution nanocore keylogger persistence spyware stealer trojan

Malware Config

Extracted

Family

nanocore

Version

1.2.2.0

erpc.io:443
www.erpc.io:443

Mutex

f26b3377-9c85-4ba4-a41f-62cf1755fba1

Attributes

activate_away_mode
true
backup_connection_host
www.erpc.io
backup_dns_server
8.8.4.4
buffer_size
65535
build_time
2026-05-12T06:08:52.911991536Z
bypass_user_account_control
false
bypass_user_account_control_data
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
clear_access_control
true
clear_zone_identifier
false
connect_delay
4000
connection_port
443
default_group
unknow
enable_debug_mode
false
gc_threshold
1.048576e+07
keep_alive_timeout
30000
keyboard_logging
false
lan_timeout
2500
max_packet_size
1.048576e+07
mutex
f26b3377-9c85-4ba4-a41f-62cf1755fba1
mutex_timeout
5000
prevent_system_sleep
false
primary_connection_host
erpc.io
primary_dns_server
8.8.8.8
request_elevation
false
restart_delay
5000
run_delay
9
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.
keylogger trojan stealer spyware nanocore

Executes dropped EXE 1 IoCs

pid	Process
2472	smtpsv.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\SMTP Service = "C:\\Program Files (x86)\\SMTP Service\\smtpsv.exe"	erpc.io.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

defense_evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	erpc.io.exe

Drops file in Program Files directory 3 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\SMTP Service\smtpsv.exe	erpc.io.exe
File opened for modification	C:\Program Files (x86)\SMTP Service\smtpsv.exe	erpc.io.exe
File opened for modification	C:\Program Files (x86)\SMTP Service\client.log	smtpsv.exe

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	smtpsv.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	erpc.io.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	erpc.io.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4228	schtasks.exe
4248	schtasks.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe
4436	erpc.io.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4436	erpc.io.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4436	erpc.io.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4436 wrote to memory of 4228	4436	erpc.io.exe	86
PID 4436 wrote to memory of 4248	4436	erpc.io.exe	88

C:\Users\Admin\AppData\Local\Temp\erpc.io.exe
"C:\Users\Admin\AppData\Local\Temp\erpc.io.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
- Suspicious use of WriteProcessMemory
PID:4436
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /create /f /tn "SMTP Service" /xml "C:\Users\Admin\AppData\Local\Temp\tmp29BB.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4228
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks.exe" /create /f /tn "SMTP Service Task" /xml "C:\Users\Admin\AppData\Local\Temp\tmp2A39.tmp"
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:4248

C:\Program Files (x86)\SMTP Service\smtpsv.exe
"C:\Program Files (x86)\SMTP Service\smtpsv.exe"
1⤵
- Executes dropped EXE
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:2472

C:\Users\Admin\AppData\Local\Temp\erpc.io.exe
"C:\Users\Admin\AppData\Local\Temp\erpc.io.exe"
1⤵
- System Location Discovery: System Language Discovery
PID:2968

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

smtpsv.exe

Path C:\Program Files (x86)\SMTP Service\smtpsv.exe
Size 203KB
SHA256 1a4b1c047ded5964712cd991a2f2a22febcaa4d4b30d6905784207665506b30e
MD5 e53732988cb12dfdb35c85351cd2b34b
SHA1 07bc9da1523442d64a2534b6b35be81dbc113206
SHA512 678a3473cb3a3fc0f9e2f17e1ca15939c55efff91d3f4e55bdfa04eedafa2432579359c61d686ee8f039c1ebc1a6181d293be66acd0aaa0ce7012e3cb526b0c7
SSDEEP 6144:MLV6Bta6dtJmakIM5JR/4/hpQBhhVLy7J:MLV6BtpmkmR/4/UBh21
TLSH
T12A14CF163BA88A3FE2CE8679611212139379C2E398D3F3DE18D455B79F267E50A071C7
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

tmp29BB.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp29BB.tmp
Size 1KB
SHA256 d08164a72447ad45b1f9e8321e982438bc7d82c0771f9b73dd594babe416e6d1
MD5 fcdf90da4b8abb3ebfe8668a7ebc961f
SHA1 68a0750b75d9c4f60e3323a7c3467c1fa5faeeb8
SHA512 fa7abc3fb8ba84adaf9f6b27b9c6a9e3409ed079a20a2c50e04286b975e45035c7b220b7eee851dde750835b04d12245d666bb469562a57c2062bb09f66595d0
TLSH
T10021C064ACC0F71F66B15629A39297C2DE2A57A301564138FCCC4A7F3FB6186304356B
MD5 SHA1 SHA512 TLSH

Submit Download

tmp2A39.tmp

Path C:\Users\Admin\AppData\Local\Temp\tmp2A39.tmp
Size 1KB
SHA256 6fe1bdf3d1dedec102ac61b47fff909c53e0df8903098c52f3843b1e11a2d863
MD5 1129270510286b9e8bae6dc678757352
SHA1 f8f3af28a182023adb3efaaa79d034f399ec16d3
SHA512 cec6863e4d3a431668cb2aa2fd6bbd032a3e1cc61698fcd9fe952fcffc6ebda0a87ead9090767365a473c143c8b32fd269a4af03454d0f34858252c4b767844f
TLSH
T17C21C068ACC0F65B66B15625A39157C2DF2A97A301664138FCCC4E7F2FB6186304316B
MD5 SHA1 SHA512 TLSH

Submit Download

memory/2472-12-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/2472-13-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/2472-21-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/2968-14-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/2968-15-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/2968-19-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/4436-9-0x00000000751E0000-0x0000000075791000-memory.dmp

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memory/4436-1-0x00000000751E2000-0x00000000751E4000-memory.dmp

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memory/4436-0-0x00000000003F0000-0x0000000000400000-memory.dmp

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memory/4436-16-0x00000000003F0000-0x0000000000400000-memory.dmp

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memory/4436-17-0x00000000751E2000-0x00000000751E4000-memory.dmp

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memory/4436-22-0x00000000751E0000-0x0000000075791000-memory.dmp

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