quasar | 992aa914b0bd9a7fe3008f7885de511bd16af974165754492e847530d08541d3

Analysis

max time kernel
436s
max time network
624s
platform
windows11-21h2_x64
resource
win11-20240704-en
resource tags

arch:x64arch:x86image:win11-20240704-enlocale:en-usos:windows11-21h2-x64system
submitted
06/07/2024, 14:05

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General

Target

pegasus.exe
Size

3.1MB
MD5

2e46c4fb200c850394e4e708d4c0d36b
SHA1

dbeae23123b58434eedf7a0462dda53b7ae0fc01
SHA256

198076159ed4e2443380f81b53f506807e3ef4cca8692084922744548e5383bf
SHA512

a0c8ec64b280a3c2800cb300d464340a4de79dea2907b3c1d66bb2f54d447794e20f8097d2be6299ae04a395891d33589531142cdc7516131d9afe4e7ac0a8c2
SSDEEP

49152:3vgt62XlaSFNWPjljiFa2RoUYIyKAi+h8vJihoGdJoTHHB72eh2NT:3vM62XlaSFNWPjljiFXRoUYIMhb5

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

90.219.112.122:4782

Mutex

878b2fb4-192c-4f50-ae38-0881a431b12f

Attributes

encryption_key
DB1FE6851C4D98E11497D9AF06379F8966EC065A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Java Updater
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/4748-1-0x0000000000020000-0x0000000000344000-memory.dmp	family_quasar

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	pegasus.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	pegasus.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1945933150-1754111531-3454729080-1000_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

pid	Process
1452	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4748	pegasus.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1216	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4748 wrote to memory of 1452	4748	pegasus.exe	78
PID 4748 wrote to memory of 1452	4748	pegasus.exe	78

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\pegasus.exe
"C:\Users\Admin\AppData\Local\Temp\pegasus.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4748
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1452

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:1216

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
1⤵
PID:3640

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3756

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

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
86bc1f430c46c1c8597ba754a8855be9

SHA1
8be41ec9fb15b246f9c107545ad15314d1160f01

SHA256
9f277094b7ff8fe8e320026497542a0b52e2a1be8b108a63a83e8371e0a6bf86

SHA512
47655f29fd07921c53d98051c1ce3408b94bb03284526f4cd273e92359e54342233aee4cae1161863df84f17e870f9bb8b80bb7e70c8662280e9a79744fe9e94

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

Filesize
10KB

MD5
d99739e3657b8a4c1259c604069954dd

SHA1
450004f5f1c436cc1302bd51dbe81141a6e847e1

SHA256
91695bb6bd03a200dfc32e50bf858bcd7d95b598196ae5df7d5bfd1add9ecb36

SHA512
bd2f5ca319a57a642a7992533ba0903883134e1460de1598561f72828c20c68e5b3a752defef21962567181e5158df116d725c70bbe1f0042dbc6870b5075dae

Download Submit
memory/4748-0-0x00007FFC16303000-0x00007FFC16305000-memory.dmp

Filesize
8KB

Download
memory/4748-1-0x0000000000020000-0x0000000000344000-memory.dmp

Filesize
3.1MB

Download
memory/4748-2-0x00007FFC16300000-0x00007FFC16DC2000-memory.dmp

Filesize
10.8MB

Download
memory/4748-4-0x00007FFC16303000-0x00007FFC16305000-memory.dmp

Filesize
8KB

Download
memory/4748-5-0x00007FFC16300000-0x00007FFC16DC2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads