quasar | 505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3

Analysis

max time kernel
150s
max time network
151s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20250410-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250410-enlocale:en-usos:windows10-ltsc_2021-x64system
submitted
19/04/2025, 13:22

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General

Target

Client-built.exe
Size

1.9MB
MD5

46e15951b8bcf47690ab6aea44fe989f
SHA1

89223807bb1e72cbd49599636734b2f93beda276
SHA256

505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3
SHA512

118a2fe1140ae54f5abfbc60b1f3a9f548f276a05130afcedba51c0f85af9df3e91e6f6557ac857571772b9c0780fe6d78925bed7ec8bfab185aa94a031717ae
SSDEEP

24576:Y1JFopYS2eWBRwRR16zhHIPbcNK0KKm77yviUSQaZaOwI55l2S62r9exnsDtR9:Y7F37wR2EgKKm77LrwCB6Tc

Score

10^/10

quasar spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
43EB246F63BA6C5E8F1B8F576653410351E57F4E
reconnect_delay
3000

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/5960-1-0x0000023BFDB40000-0x0000023BFDD2C000-memory.dmp	family_quasar
behavioral1/files/0x00090000000281cb-4.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5536	OfficeDirectory03.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\OfficeDirectory03.exe	Client-built.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3260	schtasks.exe
1088	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
5536	OfficeDirectory03.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5960	Client-built.exe
Token: SeDebugPrivilege	5536	OfficeDirectory03.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5536	OfficeDirectory03.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5960 wrote to memory of 1088	5960	Client-built.exe	82
PID 5960 wrote to memory of 1088	5960	Client-built.exe	82
PID 5960 wrote to memory of 5536	5960	Client-built.exe	84
PID 5960 wrote to memory of 5536	5960	Client-built.exe	84
PID 5536 wrote to memory of 3260	5536	OfficeDirectory03.exe	85
PID 5536 wrote to memory of 3260	5536	OfficeDirectory03.exe	85

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5960
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1088
- C:\Windows\system32\SubDir\OfficeDirectory03.exe
  "C:\Windows\system32\SubDir\OfficeDirectory03.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5536
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3260

Network

MITRE ATT&CK Enterprise v16

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

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Downloads

C:\Windows\System32\SubDir\OfficeDirectory03.exe

Filesize
1.9MB

MD5
46e15951b8bcf47690ab6aea44fe989f

SHA1
89223807bb1e72cbd49599636734b2f93beda276

SHA256
505ea567d35277947cfaaaf37e16abdf782ada70992f2ff696c37c212f66aae3

SHA512
118a2fe1140ae54f5abfbc60b1f3a9f548f276a05130afcedba51c0f85af9df3e91e6f6557ac857571772b9c0780fe6d78925bed7ec8bfab185aa94a031717ae

Download Submit
memory/5536-9-0x000002A30E880000-0x000002A30E892000-memory.dmp

Filesize
72KB

Download
memory/5536-11-0x000002A327240000-0x000002A327290000-memory.dmp

Filesize
320KB

Download
memory/5536-17-0x00007FF855D10000-0x00007FF8567D2000-memory.dmp

Filesize
10.8MB

Download
memory/5536-15-0x000002A3272E0000-0x000002A32732A000-memory.dmp

Filesize
296KB

Download
memory/5536-7-0x00007FF855D10000-0x00007FF8567D2000-memory.dmp

Filesize
10.8MB

Download
memory/5536-16-0x000002A30E890000-0x000002A30E8BA000-memory.dmp

Filesize
168KB

Download
memory/5536-14-0x000002A327290000-0x000002A3272DC000-memory.dmp

Filesize
304KB

Download
memory/5536-8-0x00007FF855D10000-0x00007FF8567D2000-memory.dmp

Filesize
10.8MB

Download
memory/5536-10-0x000002A3271A0000-0x000002A3271DA000-memory.dmp

Filesize
232KB

Download
memory/5536-13-0x000002A3271E0000-0x000002A32722E000-memory.dmp

Filesize
312KB

Download
memory/5536-12-0x000002A327FF0000-0x000002A3280A2000-memory.dmp

Filesize
712KB

Download
memory/5960-0-0x00007FF855D13000-0x00007FF855D15000-memory.dmp

Filesize
8KB

Download
memory/5960-2-0x0000023B983D0000-0x0000023B983EA000-memory.dmp

Filesize
104KB

Download
memory/5960-6-0x00007FF855D10000-0x00007FF8567D2000-memory.dmp

Filesize
10.8MB

Download
memory/5960-1-0x0000023BFDB40000-0x0000023BFDD2C000-memory.dmp

Filesize
1.9MB

Download
memory/5960-3-0x00007FF855D10000-0x00007FF8567D2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads