quasar | 3963fc0a539aff38363c40398e825669c36293b20ecac08baa05bcf69b7f785f

Analysis

max time kernel
4s
max time network
10s
platform
windows11-21h2_x64
resource
win11-20250207-en
resource tags

arch:x64arch:x86image:win11-20250207-enlocale:en-usos:windows11-21h2-x64system
submitted
08/02/2025, 03:28

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General

Target

Client-built.exe
Size

3.1MB
MD5

1fc150ca8d96e8cfccdbcc73dcc91f1e
SHA1

84a7512da60a13ffa44ece35a882a124abe15b38
SHA256

3963fc0a539aff38363c40398e825669c36293b20ecac08baa05bcf69b7f785f
SHA512

2ff46cd3ea3724c3fa32891ffa391cc10d11f7157d003f8cde97597071508b1d4de33fd9014582120ad12a11c72bdb553c39fbbabe251bf85843ba8a309f90bb
SSDEEP

49152:HvyI22SsaNYfdPBldt698dBcjHWARJ6FbR3LoGduyTHHB72eh2NT:Hvf22SsaNYfdPBldt6+dBcjHWARJ6X

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/4232-1-0x0000000000F20000-0x0000000001244000-memory.dmp	family_quasar
behavioral1/files/0x001500000002af3f-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
760	Client.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
1004	schtasks.exe
2828	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4232	Client-built.exe
Token: SeDebugPrivilege	760	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
760	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4232 wrote to memory of 1004	4232	Client-built.exe	87
PID 4232 wrote to memory of 1004	4232	Client-built.exe	87
PID 4232 wrote to memory of 760	4232	Client-built.exe	89
PID 4232 wrote to memory of 760	4232	Client-built.exe	89
PID 760 wrote to memory of 2828	760	Client.exe	90
PID 760 wrote to memory of 2828	760	Client.exe	90

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 WriteProcessMemory
PID:4232
- 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:1004
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:760
- - 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
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2828

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 --string-annotations --always-read-main-dll --field-trial-handle=4704,i,12137759970663671229,1007707834210044651,262144 --variations-seed-version --mojo-platform-channel-handle=5228 /prefetch:14
1⤵
PID:2640

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

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
1fc150ca8d96e8cfccdbcc73dcc91f1e

SHA1
84a7512da60a13ffa44ece35a882a124abe15b38

SHA256
3963fc0a539aff38363c40398e825669c36293b20ecac08baa05bcf69b7f785f

SHA512
2ff46cd3ea3724c3fa32891ffa391cc10d11f7157d003f8cde97597071508b1d4de33fd9014582120ad12a11c72bdb553c39fbbabe251bf85843ba8a309f90bb

Download Submit
memory/760-10-0x00007FFC0E820000-0x00007FFC0F2E2000-memory.dmp

Filesize
10.8MB

Download
memory/760-11-0x00007FFC0E820000-0x00007FFC0F2E2000-memory.dmp

Filesize
10.8MB

Download
memory/760-12-0x000000001BA10000-0x000000001BA60000-memory.dmp

Filesize
320KB

Download
memory/760-13-0x000000001C890000-0x000000001C942000-memory.dmp

Filesize
712KB

Download
memory/4232-0-0x00007FFC0E823000-0x00007FFC0E825000-memory.dmp

Filesize
8KB

Download
memory/4232-1-0x0000000000F20000-0x0000000001244000-memory.dmp

Filesize
3.1MB

Download
memory/4232-2-0x00007FFC0E820000-0x00007FFC0F2E2000-memory.dmp

Filesize
10.8MB

Download
memory/4232-9-0x00007FFC0E820000-0x00007FFC0F2E2000-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