quasar | aa3170ce6b4bbd9960ac0ccd60f7d0b39cc0d28254bfe73545b540cbd8444b21 | Triage™

Analysis

max time kernel
83s
max time network
89s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
15/10/2024, 01:26

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Reason

Machine shutdown

General

Target
Client-built.exe
Size 3.1MB
Sample241015-btmkds1arr
SHA256 aa3170ce6b4bbd9960ac0ccd60f7d0b39cc0d28254bfe73545b540cbd8444b21
MD5 e35d832888fda0fd705386a4b94ecc49
SHA1 86380c3eea496c7947c25c547748cfeed51c4de9
SHA512 60d6aec705948474fa007dad26fdba9b92dcb1098aefb4eed2898af7b048729e4a3ee5af7e7b9ca9e555b97b54f6d97007dfc1531d0abb9e5da01b5911c5fd63
SSDEEP 49152:Av4lL26AaNeWgPhlmVqvMQ7XSKNEREuY4oGdPwTHHB72eh2NT:AvQL26AaNeWgPhlmVqkQ7XSKmREuT
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

HomoThugger-36407.portmap.host:36407

Mutex

42d6f4c0-e8fc-473a-b92d-ded3fb29334a

Attributes

encryption_key
3CDA48FEB25557C87485A9F37CDC861398BEA3C7
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4272-1-0x00000000007D0000-0x0000000000AF4000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Client-built.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "162"	LogonUI.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
3772	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4272	Client-built.exe
Token: SeShutdownPrivilege	3972	shutdown.exe
Token: SeRemoteShutdownPrivilege	3972	shutdown.exe

Suspicious use of FindShellTrayWindow 3 IoCs

pid	Process
4272	Client-built.exe
4272	Client-built.exe
4272	Client-built.exe

Suspicious use of SendNotifyMessage 3 IoCs

pid	Process
4272	Client-built.exe
4272	Client-built.exe
4272	Client-built.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2180	LogonUI.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4272 wrote to memory of 3772	4272	Client-built.exe	87
PID 4272 wrote to memory of 3772	4272	Client-built.exe	87
PID 4272 wrote to memory of 3972	4272	Client-built.exe	106
PID 4272 wrote to memory of 3972	4272	Client-built.exe	106

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:4272
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3772
- C:\Windows\System32\shutdown.exe
  "C:\Windows\System32\shutdown.exe" /s /t 0
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3972

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa38fa855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2180

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/4272-0-0x00007FFEB3DF3000-0x00007FFEB3DF5000-memory.dmp

Download

memory/4272-1-0x00000000007D0000-0x0000000000AF4000-memory.dmp

Download

memory/4272-2-0x00007FFEB3DF0000-0x00007FFEB48B1000-memory.dmp

Download

memory/4272-3-0x000000001C2F0000-0x000000001C340000-memory.dmp

Download

memory/4272-4-0x000000001C400000-0x000000001C4B2000-memory.dmp

Download

memory/4272-7-0x000000001C340000-0x000000001C352000-memory.dmp

Download

memory/4272-8-0x000000001C3A0000-0x000000001C3DC000-memory.dmp

Download

memory/4272-9-0x00007FFEB3DF3000-0x00007FFEB3DF5000-memory.dmp

Download

memory/4272-10-0x00007FFEB3DF0000-0x00007FFEB48B1000-memory.dmp

Download

memory/4272-11-0x00007FFEB3DF0000-0x00007FFEB48B1000-memory.dmp

Download