Malware Analysis Report

2025-04-13 23:38

Sample ID 230905-tjg62agh3y
Target x5rcnYdSS63I.exe
SHA256 37a9de85c77b7c0bcf5e7147ec294a3bb9158aff6a5b2aca6e98b11d33c4ae75
Tags
nyan cat njrat
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

37a9de85c77b7c0bcf5e7147ec294a3bb9158aff6a5b2aca6e98b11d33c4ae75

Threat Level: Known bad

The file x5rcnYdSS63I.exe was found to be: Known bad.

Malicious Activity Summary

nyan cat njrat

Njrat family

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-09-05 16:05

Signatures

Njrat family

njrat

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-09-05 16:05

Reported

2023-09-05 16:07

Platform

win7-20230831-en

Max time kernel

118s

Max time network

122s

Command Line

"C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

Signatures

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe

"C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

C:\Windows\SysWOW64\cmd.exe

cmd.exe /C Y /N /D Y /T 1 & Del "C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 gremabenj.duckdns.org udp
CO 179.13.6.226:3110 gremabenj.duckdns.org tcp

Files

memory/868-0-0x00000000746E0000-0x0000000074C8B000-memory.dmp

memory/868-1-0x00000000746E0000-0x0000000074C8B000-memory.dmp

memory/868-2-0x0000000000B70000-0x0000000000BB0000-memory.dmp

memory/868-3-0x00000000746E0000-0x0000000074C8B000-memory.dmp

memory/868-4-0x00000000746E0000-0x0000000074C8B000-memory.dmp

memory/868-5-0x0000000000B70000-0x0000000000BB0000-memory.dmp

memory/868-6-0x0000000000B70000-0x0000000000BB0000-memory.dmp

memory/868-7-0x00000000746E0000-0x0000000074C8B000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-09-05 16:05

Reported

2023-09-05 16:07

Platform

win10v2004-20230831-en

Max time kernel

139s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

Signatures

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: 33 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3136 wrote to memory of 3080 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe C:\Windows\SysWOW64\cmd.exe
PID 3136 wrote to memory of 3080 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe C:\Windows\SysWOW64\cmd.exe
PID 3136 wrote to memory of 3080 N/A C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe C:\Windows\SysWOW64\cmd.exe

Processes

C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe

"C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

C:\Windows\SysWOW64\cmd.exe

cmd.exe /C Y /N /D Y /T 1 & Del "C:\Users\Admin\AppData\Local\Temp\x5rcnYdSS63I.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 gremabenj.duckdns.org udp
CO 179.13.6.226:3110 gremabenj.duckdns.org tcp
US 8.8.8.8:53 226.6.13.179.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 1.208.79.178.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 7.173.189.20.in-addr.arpa udp

Files

memory/3136-0-0x0000000074970000-0x0000000074F21000-memory.dmp

memory/3136-1-0x0000000074970000-0x0000000074F21000-memory.dmp

memory/3136-2-0x0000000000D80000-0x0000000000D90000-memory.dmp

memory/3136-3-0x0000000074970000-0x0000000074F21000-memory.dmp

memory/3136-4-0x0000000074970000-0x0000000074F21000-memory.dmp

memory/3136-5-0x0000000000D80000-0x0000000000D90000-memory.dmp

memory/3136-7-0x0000000074970000-0x0000000074F21000-memory.dmp