quasar | a99195bc5021cb62d6946d51f478be9e4e32c40da5be7f706757b36ac9fc2e26

Analysis

max time kernel
149s
max time network
152s
platform
windows11-21h2_x64
resource
win11-20241023-en
resource tags

arch:x64arch:x86image:win11-20241023-enlocale:en-usos:windows11-21h2-x64system
submitted
16-11-2024 13:09

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General

Target

Client-built.exe
Size

3.1MB
MD5

1bca12f842d32d0cb1411dd70cb37d74
SHA1

ca8dff22c3df385aeb69207dbee621294ce64465
SHA256

a99195bc5021cb62d6946d51f478be9e4e32c40da5be7f706757b36ac9fc2e26
SHA512

0ff6395b2c2c09119304cd28742167a424a867f9efb97ee9f7608c78cb95d3114206bf8aa6a96004817219d08d1b770d7e0a90ce9fd818aed717c660057814ef
SSDEEP

49152:SvQt62XlaSFNWPjljiFa2RoUYIPaXm0mzXsoGdQTHHB72eh2NT:Svc62XlaSFNWPjljiFXRoUYIiXmW

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.30:4782

Mutex

527d6b5a-c716-4500-9e84-5840c7e340a4

Attributes

encryption_key
E54BE336D58046FD53BA6384AD78D66E8B2B987A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Discord
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/956-1-0x0000000000E80000-0x00000000011A4000-memory.dmp	family_quasar

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

System Information Discovery
T1082
Modifies registry class 1 IoCs

Processes:

MiniSearchHost.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-4248760313-3670024077-2384670640-1000_Classes\Local Settings\MuiCache MiniSearchHost.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
T1053.005

Processes:

schtasks.exe

pid process

3384 schtasks.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Client-built.exe

description pid process

Token: SeDebugPrivilege 956 Client-built.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client-built.exe

pid process

956 Client-built.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client-built.exe

pid process

956 Client-built.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

Client-built.exeMiniSearchHost.exe

pid process

956 Client-built.exe
220 MiniSearchHost.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-4248760313-3670024077-2384670640-1000_Classes\Local Settings\MuiCache	MiniSearchHost.exe

pid	process
3384	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	956	Client-built.exe

pid	process
956	Client-built.exe

pid	process
956	Client-built.exe

pid	process
956	Client-built.exe
220	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Client-built.exe

description	pid	process	target process
PID 956 wrote to memory of 3384	956	Client-built.exe	schtasks.exe
PID 956 wrote to memory of 3384	956	Client-built.exe	schtasks.exe

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:956
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3384

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:220

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
1301a13a0b62ba61652cdbf2d61f80fa

SHA1
1911d1f0d097e8f5275a29e17b0bcef305df1d9e

SHA256
7e75ad955706d05f5934810aebbd3b5a7742d5e5766efd9c4fc17ee492b2f716

SHA512
66aa4261628bb31ee416af70f4159c02e5bbfbe2f7645e87d70bb35b1f20fa915d62b25d99cd72c59580d1f64e6c6b5ad36ace6600d3bcdb67f45036d768ed8b

Download Submit
memory/956-0-0x00007FFE400D3000-0x00007FFE400D5000-memory.dmp

Filesize
8KB

Download
memory/956-1-0x0000000000E80000-0x00000000011A4000-memory.dmp

Filesize
3.1MB

Download
memory/956-2-0x00007FFE400D0000-0x00007FFE40B92000-memory.dmp

Filesize
10.8MB

Download
memory/956-3-0x000000001CE00000-0x000000001CE50000-memory.dmp

Filesize
320KB

Download
memory/956-4-0x000000001CF10000-0x000000001CFC2000-memory.dmp

Filesize
712KB

Download
memory/956-12-0x00007FFE400D3000-0x00007FFE400D5000-memory.dmp

Filesize
8KB

Download
memory/956-13-0x00007FFE400D0000-0x00007FFE40B92000-memory.dmp

Filesize
10.8MB

Download