Malware Analysis Report

2025-04-13 11:56

Sample ID 240818-16w22axflh
Target Client-built.exe
SHA256 f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f
Tags
skids quasar 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: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f

Threat Level: Known bad

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

Malicious Activity Summary

skids quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Drops file in System32 directory

Unsigned PE

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 22:16

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

2024-08-18 22:16

Reported

2024-08-18 22:19

Platform

win7-20240704-en

Max time kernel

126s

Max time network

139s

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

Files

memory/2564-0-0x000007FEF5013000-0x000007FEF5014000-memory.dmp

memory/2564-1-0x0000000000280000-0x00000000005E0000-memory.dmp

memory/2564-2-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

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

MD5 ad8250eea17d8d7db7c3c23aba289f5c
SHA1 c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59
SHA256 f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f
SHA512 d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd

memory/2920-8-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

memory/2920-10-0x0000000000850000-0x0000000000BB0000-memory.dmp

memory/2564-9-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

memory/2920-11-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

memory/2920-12-0x000007FEF5010000-0x000007FEF59FC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-18 22:16

Reported

2024-08-18 22:29

Platform

win10v2004-20240802-en

Max time kernel

788s

Max time network

805s

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 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
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

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 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 134.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 133.211.185.52.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 11.227.111.52.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 147.185.221.22:10340 tcp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
US 147.185.221.22:10340 tcp
US 8.8.8.8:53 48.192.11.51.in-addr.arpa udp
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
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/3424-0-0x00007FFE509A3000-0x00007FFE509A5000-memory.dmp

memory/3424-1-0x0000000000E70000-0x00000000011D0000-memory.dmp

memory/3424-2-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

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

MD5 ad8250eea17d8d7db7c3c23aba289f5c
SHA1 c63d1c6b6e8b7789a777b1ffe55f15bbbfc3cc59
SHA256 f3de21ec995555ab187ce0a254d2b353c1ed3c06030678f898ec56efabbae51f
SHA512 d34b9db43bd08dea4452925c7c1cf4014d03b024a663b5ee938a4f205b3c6c49eccd169cbc687145d54223d07aafcde75ee0807963e705c9c71e130c00086abd

memory/3424-9-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

memory/2140-10-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

memory/2140-11-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp

memory/2140-12-0x000000001C470000-0x000000001C4C0000-memory.dmp

memory/2140-13-0x000000001C580000-0x000000001C632000-memory.dmp

memory/2140-14-0x00007FFE509A0000-0x00007FFE51461000-memory.dmp