Malware Analysis Report

2025-04-03 10:20

Sample ID 250315-q1v8fayl13
Target Client-built.exe
SHA256 ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd
Tags
real quasar latentbot spyware trojan discovery
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: behavioral2

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 spyware trojan discovery

LatentBot

Latentbot family

Quasar family

Quasar payload

Quasar RAT

Checks computer location settings

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

System Network Configuration Discovery: Internet Connection Discovery

Uses Task Scheduler COM API

Runs ping.exe

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-03-15 13:44

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 13:44

Reported

2025-03-15 13:46

Platform

win7-20240903-en

Max time kernel

149s

Max time network

150s

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
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

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

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

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 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
US 8.8.8.8:53 cheezeyballs.zapto.org udp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
US 8.8.8.8:53 cheezeyballs.zapto.org udp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
DE 91.51.36.43:4847 tcp

Files

memory/2140-0-0x000007FEF5CC3000-0x000007FEF5CC4000-memory.dmp

memory/2140-1-0x0000000000180000-0x0000000000238000-memory.dmp

memory/2140-2-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

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

MD5 34a8c705e2bd75f4956b2cb6fdcef493
SHA1 97024b73c67021cdda06b78bb042d1c17e6e38d4
SHA256 ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd
SHA512 6f65a700ac682b1066bd95fe62e9eee1194ca86462833e7b961a7f00b8525fca1d3f6fbf799d9bf0364446552d32913358d47ce15b9ab310b6ae463fa673acf5

memory/2836-10-0x0000000000870000-0x0000000000928000-memory.dmp

memory/2836-9-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

memory/2140-8-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

memory/2836-11-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

memory/2836-12-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

memory/2836-13-0x000007FEF5CC0000-0x000007FEF66AC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-03-15 13:44

Reported

2025-03-15 13:46

Platform

win10v2004-20250314-en

Max time kernel

104s

Max time network

132s

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

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-3920955164-3782810283-1225622749-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe 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 5184 wrote to memory of 5312 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5184 wrote to memory of 5312 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5184 wrote to memory of 5208 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe
PID 5184 wrote to memory of 5208 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe
PID 5208 wrote to memory of 4600 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5208 wrote to memory of 4600 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5208 wrote to memory of 5424 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5208 wrote to memory of 5424 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\SYSTEM32\schtasks.exe
PID 5208 wrote to memory of 4624 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\system32\cmd.exe
PID 5208 wrote to memory of 4624 N/A C:\Users\Admin\AppData\Roaming\Runtime\RuntimeBroker.exe C:\Windows\system32\cmd.exe
PID 4624 wrote to memory of 1356 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 4624 wrote to memory of 1356 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 4624 wrote to memory of 1780 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\PING.EXE
PID 4624 wrote to memory of 1780 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\Ps3WxA0h6rcn.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 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 cheezeyballs.zapto.org udp
DE 91.51.36.43:4847 cheezeyballs.zapto.org tcp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 c.pki.goog udp
GB 142.250.200.35:80 c.pki.goog tcp

Files

memory/5184-0-0x00007FFF46BB3000-0x00007FFF46BB5000-memory.dmp

memory/5184-1-0x0000000000180000-0x0000000000238000-memory.dmp

memory/5184-2-0x00007FFF46BB0000-0x00007FFF47671000-memory.dmp

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

MD5 34a8c705e2bd75f4956b2cb6fdcef493
SHA1 97024b73c67021cdda06b78bb042d1c17e6e38d4
SHA256 ca7b743a5c9d25017b61f0f3d561409aa558cd9891ad07a61f6726796a3c94dd
SHA512 6f65a700ac682b1066bd95fe62e9eee1194ca86462833e7b961a7f00b8525fca1d3f6fbf799d9bf0364446552d32913358d47ce15b9ab310b6ae463fa673acf5

memory/5208-10-0x00007FFF46BB0000-0x00007FFF47671000-memory.dmp

memory/5184-9-0x00007FFF46BB0000-0x00007FFF47671000-memory.dmp

memory/5208-11-0x000000001D100000-0x000000001D150000-memory.dmp

memory/5208-12-0x000000001D210000-0x000000001D2C2000-memory.dmp

memory/5208-13-0x000000001D190000-0x000000001D1A2000-memory.dmp

memory/5208-14-0x000000001DA10000-0x000000001DA4C000-memory.dmp

memory/5208-15-0x00007FFF46BB0000-0x00007FFF47671000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\Ps3WxA0h6rcn.bat

MD5 41ed8ed80cdd58aea7b172cfc3d991c7
SHA1 a637f745b6149edc1115ece5053b98c2f74c2ea7
SHA256 6072e24c4d199509e6023d3a0abb42e9ff3f55bb4337cd66ac5c0c9a10e00c6a
SHA512 6edf3802976f1b0bc4cf7389fbaa66716256bc084bb66cb3c4bd0008c6ae3e0afe549d38ce3ee49c7798d51768c7fbca90f02e29e7799e510c76b23695713d32

memory/5208-21-0x00007FFF46BB0000-0x00007FFF47671000-memory.dmp