Malware Analysis Report

2025-04-13 23:22

Sample ID 240427-zh473aga53
Target Server.exe
SHA256 d12b9712632f295c168fc1ec4dd0748b8e885844ef7d806240d6cdb49170ada2
Tags
owo njrat evasion persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

d12b9712632f295c168fc1ec4dd0748b8e885844ef7d806240d6cdb49170ada2

Threat Level: Known bad

The file Server.exe was found to be: Known bad.

Malicious Activity Summary

owo njrat evasion persistence

Njrat family

Modifies Windows Firewall

Executes dropped EXE

Drops startup file

Legitimate hosting services abused for malware hosting/C2

Adds Run key to start application

Drops autorun.inf file

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Kills process with taskkill

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-27 20:44

Signatures

Njrat family

njrat

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-27 20:44

Reported

2024-04-27 20:45

Platform

win11-20240419-en

Max time kernel

45s

Max time network

45s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Server.exe"

Signatures

Modifies Windows Firewall

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\netsh.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6ffa764c880d15862b6efba9985fcc07.exe C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\6ffa764c880d15862b6efba9985fcc07.exe C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-734199974-1358367239-436541239-1000\Software\Microsoft\Windows\CurrentVersion\Run\6ffa764c880d15862b6efba9985fcc07 = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\" .." C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\6ffa764c880d15862b6efba9985fcc07 = "\"C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe\" .." C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A 2.tcp.eu.ngrok.io N/A N/A
N/A 2.tcp.eu.ngrok.io N/A N/A
N/A 2.tcp.eu.ngrok.io N/A N/A

Drops autorun.inf file

Description Indicator Process Target
File created C:\autorun.inf C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification C:\autorun.inf C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File created D:\autorun.inf C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File created F:\autorun.inf C:\Users\Admin\AppData\Roaming\svchost.exe N/A
File opened for modification F:\autorun.inf C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Enumerates physical storage devices

Kills process with taskkill

evasion
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\taskkill.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Roaming\svchost.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Server.exe

"C:\Users\Admin\AppData\Local\Temp\Server.exe"

C:\Users\Admin\AppData\Roaming\svchost.exe

"C:\Users\Admin\AppData\Roaming\svchost.exe"

C:\Windows\SysWOW64\netsh.exe

netsh firewall add allowedprogram "C:\Users\Admin\AppData\Roaming\svchost.exe" "svchost.exe" ENABLE

C:\Windows\SysWOW64\taskkill.exe

taskkill /F /IM Taskmgr.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 2.tcp.eu.ngrok.io udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 2.tcp.eu.ngrok.io udp
US 8.8.8.8:53 2.tcp.eu.ngrok.io udp

Files

memory/3932-0-0x00000000750D0000-0x0000000075681000-memory.dmp

memory/3932-1-0x0000000001620000-0x0000000001630000-memory.dmp

memory/3932-2-0x00000000750D0000-0x0000000075681000-memory.dmp

C:\Users\Admin\AppData\Roaming\svchost.exe

MD5 897835e99a4f3b044a3a788b65e20994
SHA1 7bf5f2cbb3ac82f0af042d09f61ca02acaf29389
SHA256 d12b9712632f295c168fc1ec4dd0748b8e885844ef7d806240d6cdb49170ada2
SHA512 6190a1ed2843419cd44b42ead10c74e6c434156dd1decccf71d34fd1a4be7c7b15ac4099283a089b94b9640cad97720a3833efbff7977fbfdeca6afc7e208432

memory/3932-12-0x00000000750D0000-0x0000000075681000-memory.dmp

memory/4276-13-0x00000000750D0000-0x0000000075681000-memory.dmp

memory/4276-23-0x00000000750D0000-0x0000000075681000-memory.dmp