Malware Analysis Report

2024-08-06 11:48

Sample ID 240610-tahffasbnh
Target Client-built.exe
SHA256 e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5
Tags
dilly quasar spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5

Threat Level: Known bad

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

Malicious Activity Summary

dilly quasar spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Checks computer location settings

Drops file in System32 directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of FindShellTrayWindow

Suspicious use of SetWindowsHookEx

Suspicious behavior: LoadsDriver

Modifies data under HKEY_USERS

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Uses Task Scheduler COM API

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-10 15:51

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

2024-06-10 15:51

Reported

2024-06-10 15:56

Platform

win7-20240221-en

Max time kernel

298s

Max time network

304s

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\en\defenderx64.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\en\defenderx64.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\en\defenderx64.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
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\en\defenderx64.exe N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Windows\system32\en\defenderx64.exe N/A

Suspicious use of SendNotifyMessage

Description Indicator Process Target
N/A N/A C:\Windows\system32\en\defenderx64.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\en\defenderx64.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 Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.exe" /rl HIGHEST /f

C:\Windows\system32\en\defenderx64.exe

"C:\Windows\system32\en\defenderx64.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 lvke-45989.portmap.host udp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp

Files

memory/3012-0-0x000007FEF5D33000-0x000007FEF5D34000-memory.dmp

memory/3012-1-0x00000000012D0000-0x00000000015F4000-memory.dmp

memory/3012-2-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

C:\Windows\System32\en\defenderx64.exe

MD5 e3c2d0b1836b0a0986bbda8072796ab0
SHA1 3ba54aca2acaa078d11e189e0b9e5cf3f57ddfb9
SHA256 e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5
SHA512 17fb83710814884d9a510c6e60708bf5d7981e461af4b0238520941218af92545d4b2719eefb384d745a06262f67ddc376901aecedf85a3802e61183cef27fc0

memory/3012-7-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2536-8-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2536-9-0x0000000000920000-0x0000000000C44000-memory.dmp

memory/2536-10-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2536-11-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

memory/2536-12-0x000007FEF5D30000-0x000007FEF671C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-10 15:51

Reported

2024-06-10 15:53

Platform

win10v2004-20240226-en

Max time kernel

137s

Max time network

146s

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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation C:\Windows\system32\en\defenderx64.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\system32\en\defenderx64.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File created C:\Windows\system32\en\defenderx64.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A
File opened for modification C:\Windows\system32\en\defenderx64.exe C:\Users\Admin\AppData\Local\Temp\Client-built.exe N/A

Enumerates physical storage devices

Creates scheduled task(s)

persistence
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

Modifies data under HKEY_USERS

Description Indicator Process Target
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "221" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1" C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent C:\Windows\system32\LogonUI.exe N/A
Set value (data) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00 C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History C:\Windows\system32\LogonUI.exe N/A
Key created \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271" C:\Windows\system32\LogonUI.exe N/A
Set value (int) \REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271" C:\Windows\system32\LogonUI.exe N/A

Suspicious behavior: LoadsDriver

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
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A 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\en\defenderx64.exe N/A
Token: SeShutdownPrivilege N/A C:\Windows\System32\shutdown.exe N/A
Token: SeRemoteShutdownPrivilege N/A C:\Windows\System32\shutdown.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\en\defenderx64.exe N/A
N/A N/A C:\Windows\system32\LogonUI.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 Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.exe" /rl HIGHEST /f

C:\Windows\system32\en\defenderx64.exe

"C:\Windows\system32\en\defenderx64.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.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 --no-appcompat-clear --mojo-platform-channel-handle=1344 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8

C:\Windows\System32\shutdown.exe

"C:\Windows\System32\shutdown.exe" /s /t 0

C:\Windows\system32\LogonUI.exe

"LogonUI.exe" /flags:0x4 /state0:0xa3997055 /state1:0x41c64e6d

Network

Country Destination Domain Proto
US 8.8.8.8:53 183.142.211.20.in-addr.arpa udp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 lvke-45989.portmap.host udp
DE 193.161.193.99:45989 lvke-45989.portmap.host tcp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 99.193.161.193.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 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 chromewebstore.googleapis.com udp
US 8.8.8.8:53 chromewebstore.googleapis.com udp
GB 142.250.200.42:443 chromewebstore.googleapis.com tcp
US 8.8.8.8:53 pki.goog udp
US 8.8.8.8:53 pki.goog udp
US 216.239.32.29:80 pki.goog tcp
US 8.8.8.8:53 42.200.250.142.in-addr.arpa udp
US 8.8.8.8:53 29.32.239.216.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 31.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 227.162.46.104.in-addr.arpa udp

Files

memory/1620-0-0x00007FF984463000-0x00007FF984465000-memory.dmp

memory/1620-1-0x0000000000AA0000-0x0000000000DC4000-memory.dmp

memory/1620-2-0x00007FF984460000-0x00007FF984F21000-memory.dmp

C:\Windows\System32\en\defenderx64.exe

MD5 e3c2d0b1836b0a0986bbda8072796ab0
SHA1 3ba54aca2acaa078d11e189e0b9e5cf3f57ddfb9
SHA256 e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5
SHA512 17fb83710814884d9a510c6e60708bf5d7981e461af4b0238520941218af92545d4b2719eefb384d745a06262f67ddc376901aecedf85a3802e61183cef27fc0

memory/1620-8-0x00007FF984460000-0x00007FF984F21000-memory.dmp

memory/3664-9-0x00007FF984460000-0x00007FF984F21000-memory.dmp

memory/3664-10-0x00007FF984460000-0x00007FF984F21000-memory.dmp

memory/3664-11-0x000000001CAB0000-0x000000001CB00000-memory.dmp

memory/3664-12-0x000000001CBC0000-0x000000001CC72000-memory.dmp

memory/3664-15-0x000000001CB40000-0x000000001CB52000-memory.dmp

memory/3664-16-0x000000001D7C0000-0x000000001D7FC000-memory.dmp

memory/3664-17-0x00007FF984460000-0x00007FF984F21000-memory.dmp

memory/3664-18-0x00007FF984460000-0x00007FF984F21000-memory.dmp

memory/3664-19-0x000000001F0D0000-0x000000001F5F8000-memory.dmp

memory/3664-23-0x00007FF984460000-0x00007FF984F21000-memory.dmp