Malware Analysis Report

2025-04-03 10:20

Sample ID 250315-qyv5navwcs
Target Client-built.exe
SHA256 ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd
Tags
real quasar latentbot discovery spyware trojan
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

ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd

Threat Level: Known bad

The file Client-built.exe was found to be: Known bad.

Malicious Activity Summary

real quasar latentbot discovery spyware trojan

LatentBot

Latentbot family

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

System Network Configuration Discovery: Internet Connection Discovery

Runs ping.exe

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-03-15 13:40

Signatures

Quasar family

quasar

Quasar payload

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

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2025-03-15 13:40

Reported

2025-03-15 13:43

Platform

win11-20250314-en

Max time kernel

103s

Max time network

105s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

LatentBot

trojan latentbot

Latentbot family

latentbot

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Executes dropped EXE

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

Enumerates physical storage devices

System Network Configuration Discovery: Internet Connection Discovery

discovery
Description Indicator Process Target
N/A N/A C:\Windows\system32\PING.EXE N/A

Runs ping.exe

Description Indicator Process Target
N/A N/A C:\Windows\system32\PING.EXE N/A

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3572 wrote to memory of 1416 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3572 wrote to memory of 1416 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3572 wrote to memory of 5988 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe
PID 3572 wrote to memory of 5988 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe
PID 5988 wrote to memory of 4644 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5988 wrote to memory of 4644 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5988 wrote to memory of 4928 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5988 wrote to memory of 4928 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5988 wrote to memory of 5040 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\system32\cmd.exe
PID 5988 wrote to memory of 5040 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\system32\cmd.exe
PID 5040 wrote to memory of 5028 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 5040 wrote to memory of 5028 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 5040 wrote to memory of 3220 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\PING.EXE
PID 5040 wrote to memory of 3220 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\PING.EXE

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe

"C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "RuntimeBroker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe" /rl HIGHEST /f

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /delete /tn "RuntimeBroker" /f

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\klo8I5I4Hchc.bat" "

C:\Windows\system32\chcp.com

chcp 65001

C:\Windows\system32\PING.EXE

ping -n 10 localhost

Network

Country Destination Domain Proto
US 8.8.8.8:53 cheezeyballs.zapto.org udp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 195.201.57.90:443 ipwho.is tcp

Files

memory/3572-0-0x00007FF9D7C93000-0x00007FF9D7C95000-memory.dmp

memory/3572-1-0x0000000000FD0000-0x0000000001088000-memory.dmp

memory/3572-2-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe

MD5 34a8c705e2bd75f4956b2cb6fdcef493
SHA1 97024b73c67021cdda06b78bb042d1c17e6e38d4
SHA256 ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd
SHA512 6f65a700ac682b1066bd95fe62e9eee1194ca86462833e7b961a7f00b8525fca1d3f6fbf799d9bf0364446552d32913358d47ce15b9ab310b6ae463fa673acf5

memory/5988-9-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

memory/3572-10-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

memory/5988-11-0x000000001CE00000-0x000000001CE50000-memory.dmp

memory/5988-12-0x000000001CF10000-0x000000001CFC2000-memory.dmp

memory/5988-13-0x000000001CEB0000-0x000000001CEC2000-memory.dmp

memory/5988-14-0x000000001D720000-0x000000001D75C000-memory.dmp

memory/5988-19-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\klo8I5I4Hchc.bat

MD5 6c594fe696d71f8d5226cf485ed6ea2e
SHA1 ec74d1b717eb45d929b540926be0e8dae6e8162f
SHA256 d3a3e171271b6efdb8b42fa1b9cb6e2d34c2d72d06e8f143f32f9e1d2b120ccc
SHA512 3dc2bf9cc1dc5475ec0869938d557d664acb2cd8daa53bd4194ec5e8302d11834a700f678607e34dc707fc3f72dc0441a8348425da00a44091aea2a9903b51ea