Malware Analysis Report

2025-04-13 11:57

Sample ID 240818-1y2mjszfqj
Target Client-built.exe
SHA256 844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983
Tags
quasar skids discovery spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983

Threat Level: Known bad

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

Malicious Activity Summary

quasar skids discovery spyware trojan

Quasar payload

Quasar RAT

Quasar family

Checks computer location settings

Executes dropped EXE

Drops file in System32 directory

System Network Configuration Discovery: Internet Connection Discovery

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of SetWindowsHookEx

Runs ping.exe

Scheduled Task/Job: Scheduled Task

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 22:04

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: behavioral2

Detonation Overview

Submitted

2024-08-18 22:04

Reported

2024-08-18 22:11

Platform

win10v2004-20240802-en

Max time kernel

325s

Max time network

329s

Command Line

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

Signatures

Quasar RAT

trojan spyware 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-1-5-21-523280732-2327480845-3730041215-1000\Control Panel\International\Geo\Nation C:\Windows\system32\Windows\Windows Host Process.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\system32\Windows\Windows Host Process.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\Windows\Windows Host Process.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Windows\system32\Windows\Windows Host Process.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:\Windows\system32\Windows\Windows Host Process.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\Windows\Windows Host Process.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4760 wrote to memory of 2952 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4760 wrote to memory of 2952 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4760 wrote to memory of 1788 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\Windows\Windows Host Process.exe
PID 4760 wrote to memory of 1788 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\Windows\Windows Host Process.exe
PID 1788 wrote to memory of 2808 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1788 wrote to memory of 2808 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1788 wrote to memory of 4856 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1788 wrote to memory of 4856 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1788 wrote to memory of 4168 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\cmd.exe
PID 1788 wrote to memory of 4168 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\cmd.exe
PID 4168 wrote to memory of 372 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 4168 wrote to memory of 372 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 4168 wrote to memory of 4260 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\PING.EXE
PID 4168 wrote to memory of 4260 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 "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

C:\Windows\system32\Windows\Windows Host Process.exe

"C:\Windows\system32\Windows\Windows Host Process.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /delete /tn "Windows Host Process" /f

C:\Windows\system32\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\lnCpXrcf0oWv.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 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 136.32.126.40.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 22.221.185.147.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 147.185.221.22:10340 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 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 137.71.105.51.in-addr.arpa udp

Files

memory/4760-0-0x00007FF90CC43000-0x00007FF90CC45000-memory.dmp

memory/4760-1-0x0000000000770000-0x0000000000AD0000-memory.dmp

memory/4760-2-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

C:\Windows\system32\Windows\Windows Host Process.exe

MD5 bc04ef1699a3b490ff2703a0bb2dcca0
SHA1 b3f70784fb7c7ef0a3cca81280ede2ffe2671e35
SHA256 844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983
SHA512 e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1

memory/4760-10-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

memory/1788-9-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

memory/1788-11-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

memory/1788-12-0x000000001B1B0000-0x000000001B200000-memory.dmp

memory/1788-13-0x000000001BB40000-0x000000001BBF2000-memory.dmp

memory/1788-14-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

memory/1788-17-0x000000001B260000-0x000000001B272000-memory.dmp

memory/1788-18-0x000000001BAC0000-0x000000001BAFC000-memory.dmp

memory/1788-23-0x00007FF90CC40000-0x00007FF90D701000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\lnCpXrcf0oWv.bat

MD5 a004cb3b4e56b606847a9e45983566a0
SHA1 3507e1a341551c4099e1b795bd4e2d4086676760
SHA256 41954e985436118cc23fa2466ee4f997d3d84dad48691e5646b674f6fe1050c4
SHA512 3e45874dddbadac74606402dd3083cf58c2e654d7ffed9192ff9b0452b92cf35f6bf70a4d16f659a0bc3b4c7d7d3247a7a2d05bb992a0b0b4eed6d7c840a8257

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-18 22:04

Reported

2024-08-18 22:07

Platform

win7-20240704-en

Max time kernel

130s

Max time network

154s

Command Line

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

Signatures

Quasar RAT

trojan spyware 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:\Windows\system32\Windows\Windows Host Process.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\Windows\Windows Host Process.exe N/A
File opened for modification C:\Windows\system32\Windows C:\Windows\system32\Windows\Windows Host Process.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:\Windows\system32\Windows\Windows Host Process.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\Windows\Windows Host Process.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 "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

C:\Windows\system32\Windows\Windows Host Process.exe

"C:\Windows\system32\Windows\Windows Host Process.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp
US 147.185.221.22:10340 tcp

Files

memory/2484-0-0x000007FEF59E3000-0x000007FEF59E4000-memory.dmp

memory/2484-1-0x0000000000010000-0x0000000000370000-memory.dmp

memory/2484-2-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

C:\Windows\System32\Windows\Windows Host Process.exe

MD5 bc04ef1699a3b490ff2703a0bb2dcca0
SHA1 b3f70784fb7c7ef0a3cca81280ede2ffe2671e35
SHA256 844f43264b78b25a6526ab5f9997cca8243f67d51400f2abd4fd3c777b5fb983
SHA512 e3d11bd54f4409c3a846e6466063d5e29f8222b3c2a2291b19401632a7a3884ed6bde8327c664f2b43e6e67914fca1eae4805730adbfd37706ac4d7e0a28a2e1

memory/2716-8-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

memory/2484-10-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

memory/2716-9-0x0000000000950000-0x0000000000CB0000-memory.dmp

memory/2716-11-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp

memory/2716-12-0x000007FEF59E0000-0x000007FEF63CC000-memory.dmp