Malware Analysis Report

2025-04-13 11:57

Sample ID 240818-z6fvdaxhpl
Target Client-built.exe
SHA256 2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8
Tags
skids quasar 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

2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8

Threat Level: Known bad

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

Malicious Activity Summary

skids quasar spyware trojan discovery

Quasar payload

Quasar RAT

Quasar family

Executes dropped EXE

Checks computer location settings

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 FindShellTrayWindow

Suspicious use of SetWindowsHookEx

Uses Task Scheduler COM API

Suspicious use of WriteProcessMemory

Suspicious use of SendNotifyMessage

Scheduled Task/Job: Scheduled Task

Runs ping.exe

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-18 21:19

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 21:19

Reported

2024-08-18 21:22

Platform

win7-20240705-en

Max time kernel

150s

Max time network

150s

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 FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A 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
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
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/2676-0-0x000007FEF5B03000-0x000007FEF5B04000-memory.dmp

memory/2676-1-0x0000000000F70000-0x00000000012C8000-memory.dmp

memory/2676-2-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

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

MD5 449c9192baa7503151f8bb30aa32153b
SHA1 3906a9de42cb337d89e49542660f38144138d7ba
SHA256 2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8
SHA512 c1fe393d34f2af903c755c9d18faeb71193ef6ceb285d1900c2b6df1798346f927367ab32c5b2de5f39e47b781f8a94224642effe2400323f7a0153a0c7fa624

memory/2152-8-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

memory/2676-10-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

memory/2152-9-0x0000000000AB0000-0x0000000000E08000-memory.dmp

memory/2152-11-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

memory/2152-12-0x000007FEF5B00000-0x000007FEF64EC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-18 21:19

Reported

2024-08-18 21:24

Platform

win10v2004-20240802-en

Max time kernel

234s

Max time network

252s

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-1-5-21-2170637797-568393320-3232933035-1000\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 1840 wrote to memory of 4548 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1840 wrote to memory of 4548 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SYSTEM32\schtasks.exe
PID 1840 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\Windows\Windows Host Process.exe
PID 1840 wrote to memory of 3980 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\system32\Windows\Windows Host Process.exe
PID 3980 wrote to memory of 2356 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3980 wrote to memory of 2356 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3980 wrote to memory of 4208 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3980 wrote to memory of 4208 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\SYSTEM32\schtasks.exe
PID 3980 wrote to memory of 1192 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\cmd.exe
PID 3980 wrote to memory of 1192 N/A C:\Windows\system32\Windows\Windows Host Process.exe C:\Windows\system32\cmd.exe
PID 1192 wrote to memory of 2744 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 1192 wrote to memory of 2744 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\chcp.com
PID 1192 wrote to memory of 4912 N/A C:\Windows\system32\cmd.exe C:\Windows\system32\PING.EXE
PID 1192 wrote to memory of 4912 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:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4280,i,10065386245627775856,6567048529106473151,262144 --variations-seed-version --mojo-platform-channel-handle=4316 /prefetch:8

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\bx6FdaD96gxH.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 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 14.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 147.185.221.22:6712 tcp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 22.221.185.147.in-addr.arpa udp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
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 34.58.20.217.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

Files

memory/1840-0-0x00007FFAABA03000-0x00007FFAABA05000-memory.dmp

memory/1840-1-0x0000000000D90000-0x00000000010E8000-memory.dmp

memory/1840-2-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

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

MD5 449c9192baa7503151f8bb30aa32153b
SHA1 3906a9de42cb337d89e49542660f38144138d7ba
SHA256 2d43f484fc7f954ecd5da337017ab2eb58c26ef39ec07e9bf5d53af63c9c4db8
SHA512 c1fe393d34f2af903c755c9d18faeb71193ef6ceb285d1900c2b6df1798346f927367ab32c5b2de5f39e47b781f8a94224642effe2400323f7a0153a0c7fa624

memory/3980-10-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

memory/1840-9-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

memory/3980-11-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

memory/3980-12-0x000000001B9E0000-0x000000001BA30000-memory.dmp

memory/3980-13-0x000000001BAF0000-0x000000001BBA2000-memory.dmp

memory/3980-16-0x000000001BA30000-0x000000001BA42000-memory.dmp

memory/3980-17-0x000000001BA90000-0x000000001BACC000-memory.dmp

memory/3980-18-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

memory/3980-19-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

memory/3980-24-0x00007FFAABA00000-0x00007FFAAC4C1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\bx6FdaD96gxH.bat

MD5 bceb5c01be57a249cb983921d8ab6409
SHA1 dc7e3b73f1712958968bddb9865cefa44b1e6678
SHA256 89596be1ef525b7a9db4104be661842177a9c9225b795d0efadbec6473dda978
SHA512 5b7a8a3ad63bafe5359f43e92394df997695e024c0cd97683a6d22d6ab6c0d222acb8465457a47d2f87c0ed3f011a150c4db03e9fb9cceecbb0d021a0972dbb5