Malware Analysis Report

2025-04-13 11:58

Sample ID 240818-1wn9fazeln
Target Client-built.exe
SHA256 659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
Tags
quasar skids 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: behavioral3

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819

Threat Level: Known bad

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

Malicious Activity Summary

quasar skids spyware trojan

Quasar payload

Quasar family

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 22:00

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 22:00

Reported

2024-08-18 22:03

Platform

win10v2004-20240802-fr

Max time kernel

136s

Max time network

147s

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

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 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp

Files

memory/3628-0-0x00007FF9F28B3000-0x00007FF9F28B5000-memory.dmp

memory/3628-1-0x0000000000E90000-0x00000000011E6000-memory.dmp

memory/3628-2-0x00007FF9F28B0000-0x00007FF9F3371000-memory.dmp

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

MD5 7ab6f43a992374ea2bc02b6870f92726
SHA1 52277ea3799bc72c661a82d079184898239301db
SHA256 659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
SHA512 e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e

memory/2356-9-0x00007FF9F28B0000-0x00007FF9F3371000-memory.dmp

memory/3628-10-0x00007FF9F28B0000-0x00007FF9F3371000-memory.dmp

memory/2356-11-0x00007FF9F28B0000-0x00007FF9F3371000-memory.dmp

memory/2356-12-0x0000000001B30000-0x0000000001B80000-memory.dmp

memory/2356-13-0x000000001C050000-0x000000001C102000-memory.dmp

memory/2356-14-0x00007FF9F28B0000-0x00007FF9F3371000-memory.dmp

Analysis: behavioral3

Detonation Overview

Submitted

2024-08-18 22:00

Reported

2024-08-18 22:03

Platform

win11-20240802-fr

Max time kernel

150s

Max time network

155s

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

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 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
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

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 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp

Files

memory/4028-0-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

memory/4028-1-0x00000000008E0000-0x0000000000C36000-memory.dmp

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

MD5 7ab6f43a992374ea2bc02b6870f92726
SHA1 52277ea3799bc72c661a82d079184898239301db
SHA256 659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
SHA512 e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e

memory/4028-8-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

memory/4720-9-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

memory/4720-10-0x000000001B250000-0x000000001B2A0000-memory.dmp

memory/4720-11-0x000000001BEA0000-0x000000001BF52000-memory.dmp

memory/4720-12-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-18 22:00

Reported

2024-08-18 22:03

Platform

win10-20240404-fr

Max time kernel

149s

Max time network

157s

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

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 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 0.0.0.0.0.0.0.0.0.0.0.0.d.2.0.5.0.0.0.0.0.0.0.0.8.0.8.0.8.0.8.0.ip6.arpa udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 23.236.111.52.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 27.73.42.20.in-addr.arpa udp
US 147.185.221.22:6712 tcp

Files

memory/5056-0-0x00007FFA5B0D3000-0x00007FFA5B0D4000-memory.dmp

memory/5056-1-0x0000000000E10000-0x0000000001166000-memory.dmp

memory/5056-2-0x00007FFA5B0D0000-0x00007FFA5BABC000-memory.dmp

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

MD5 7ab6f43a992374ea2bc02b6870f92726
SHA1 52277ea3799bc72c661a82d079184898239301db
SHA256 659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819
SHA512 e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e

memory/4460-10-0x00007FFA5B0D0000-0x00007FFA5BABC000-memory.dmp

memory/5056-9-0x00007FFA5B0D0000-0x00007FFA5BABC000-memory.dmp

memory/4460-11-0x00007FFA5B0D0000-0x00007FFA5BABC000-memory.dmp

memory/4460-12-0x000000001BF70000-0x000000001BFC0000-memory.dmp

memory/4460-13-0x000000001C080000-0x000000001C132000-memory.dmp

memory/4460-14-0x00007FFA5B0D0000-0x00007FFA5BABC000-memory.dmp