Malware Analysis Report

2025-04-13 23:22

Sample ID 240427-y81rwsff95
Target CompatibilityCheck.exe
SHA256 6f9b61794c9169a8860fb74e2cc0253b0bc283327b6485f799265f702a67c921
Tags
i am furry 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

6f9b61794c9169a8860fb74e2cc0253b0bc283327b6485f799265f702a67c921

Threat Level: Known bad

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

Malicious Activity Summary

i am furry njrat evasion persistence

Njrat family

Modifies Windows Firewall

Executes dropped EXE

Drops startup file

Adds Run key to start application

Drops autorun.inf file

Enumerates physical storage devices

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Kills process with taskkill

Suspicious behavior: GetForegroundWindowSpam

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-27 20:28

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 20:28

Reported

2024-04-27 20:30

Platform

win11-20240419-en

Max time kernel

150s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\CompatibilityCheck.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\e14109296e01cf24bb9b7f72f64c4cb3.exe C:\ProgramData\COM Surrogate.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\e14109296e01cf24bb9b7f72f64c4cb3.exe C:\ProgramData\COM Surrogate.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\svchost.exe N/A
N/A N/A C:\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\e14109296e01cf24bb9b7f72f64c4cb3 = "\"C:\\ProgramData\\COM Surrogate.exe\" .." C:\ProgramData\COM Surrogate.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\e14109296e01cf24bb9b7f72f64c4cb3 = "\"C:\\ProgramData\\COM Surrogate.exe\" .." C:\ProgramData\COM Surrogate.exe N/A

Drops autorun.inf file

Description Indicator Process Target
File opened for modification F:\autorun.inf C:\ProgramData\COM Surrogate.exe N/A
File created C:\autorun.inf C:\ProgramData\COM Surrogate.exe N/A
File opened for modification C:\autorun.inf C:\ProgramData\COM Surrogate.exe N/A
File created D:\autorun.inf C:\ProgramData\COM Surrogate.exe N/A
File created F:\autorun.inf C:\ProgramData\COM Surrogate.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:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A
N/A N/A C:\ProgramData\COM Surrogate.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\ProgramData\COM Surrogate.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\taskkill.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A
Token: 33 N/A C:\ProgramData\COM Surrogate.exe N/A
Token: SeIncBasePriorityPrivilege N/A C:\ProgramData\COM Surrogate.exe N/A

Processes

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

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

C:\ProgramData\COM Surrogate.exe

"C:\ProgramData\COM Surrogate.exe"

C:\Windows\SysWOW64\netsh.exe

netsh firewall add allowedprogram "C:\ProgramData\COM Surrogate.exe" "COM Surrogate.exe" ENABLE

C:\Windows\SysWOW64\taskkill.exe

taskkill /F /IM SecHealthUI.exe

C:\Windows\System32\rundll32.exe

C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding

C:\svchost.exe

"C:\svchost.exe"

C:\svchost.exe

"C:\svchost.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp
US 8.8.8.8:53 green-morrison.gl.at.ply.gg udp

Files

memory/4240-0-0x0000000074E00000-0x00000000753B1000-memory.dmp

memory/4240-1-0x0000000074E00000-0x00000000753B1000-memory.dmp

memory/4240-2-0x0000000001290000-0x00000000012A0000-memory.dmp

C:\ProgramData\COM Surrogate.exe

MD5 0c84829a79c06e88510607526990391e
SHA1 63970a42f5b779c1f0f8d95d493317917b0bd46d
SHA256 6f9b61794c9169a8860fb74e2cc0253b0bc283327b6485f799265f702a67c921
SHA512 85638191fee2b456e601487aff23bc5dccbfd24e74970e5f1d8fbdad633a3d31208887f682debf1fd2abcec6e36c50e74b6da30c660dfa0bc0471e7ef8c98f40

memory/2260-14-0x0000000001B00000-0x0000000001B10000-memory.dmp

memory/2260-13-0x0000000074E00000-0x00000000753B1000-memory.dmp

memory/4240-12-0x0000000074E00000-0x00000000753B1000-memory.dmp

memory/2260-24-0x0000000074E00000-0x00000000753B1000-memory.dmp

memory/2260-25-0x0000000001B00000-0x0000000001B10000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\CLR_v2.0_32\UsageLogs\svchost.exe.log

MD5 2a0834560ed3770fc33d7a42f8229722
SHA1 c8c85f989e7a216211cf9e4ce90b0cc95354aa53
SHA256 8aa2d836004258f1a1195dc4a96215b685aed0c46a261a2860625d424e9402b6
SHA512 c5b64d84e57eb8cc387b5feedf7719f1f7ae21f6197169f5f73bc86deddb538b9af3c9952c94c4f69ae956e1656d11ab7441c292d2d850a4d2aaa9ec678f8e82