quasar | 26be6ca6971dd5944143a5303bc41d6d5659c440d67766cb36f1d2512cdc9e0f

Analysis

max time kernel
141s
max time network
143s
platform
windows11-21h2_x64
resource
win11-20250411-en
resource tags

arch:x64arch:x86image:win11-20250411-enlocale:en-usos:windows11-21h2-x64system
submitted
19/04/2025, 23:16

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General

Target

Client-built.exe
Size

3.1MB
MD5

4cf97b8b165eb337c55a54bdc3c28cd9
SHA1

c164d3f18d26926f7f93a0a91ac3d12fcdeb4f04
SHA256

26be6ca6971dd5944143a5303bc41d6d5659c440d67766cb36f1d2512cdc9e0f
SHA512

818a25f992061534a6682008695c57de24b38dbce83db21927a2b328a58b352a2d526664cb77ad0c48910a134d99fc2edfcbe5a8a142ff40a664d3a0ede15b40
SSDEEP

49152:rvnI22SsaNYfdPBldt698dBcjHd4xNESE1k/iiLoGd/THHB72eh2NT:rvI22SsaNYfdPBldt6+dBcjHWxss

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.224:4782

Mutex

4006408b-5bd7-4d76-aa52-365c5241bff9

Attributes

encryption_key
582E88CF49179DB0D59A8C982202EC5C7DD95E0B
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
behavioral2/memory/240-1-0x00000000004B0000-0x00000000007D4000-memory.dmp	family_quasar
behavioral2/files/0x001d00000002b1b0-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4068	Client.exe

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	240	Client-built.exe
Token: SeDebugPrivilege	4068	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4068	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4068	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4068	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 240 wrote to memory of 4068	240	Client-built.exe	79
PID 240 wrote to memory of 4068	240	Client-built.exe	79

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:240
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  PID:4068

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
4cf97b8b165eb337c55a54bdc3c28cd9

SHA1
c164d3f18d26926f7f93a0a91ac3d12fcdeb4f04

SHA256
26be6ca6971dd5944143a5303bc41d6d5659c440d67766cb36f1d2512cdc9e0f

SHA512
818a25f992061534a6682008695c57de24b38dbce83db21927a2b328a58b352a2d526664cb77ad0c48910a134d99fc2edfcbe5a8a142ff40a664d3a0ede15b40

Download Submit
memory/240-0-0x00007FFB44113000-0x00007FFB44115000-memory.dmp

Filesize
8KB

Download
memory/240-1-0x00000000004B0000-0x00000000007D4000-memory.dmp

Filesize
3.1MB

Download
memory/240-2-0x00007FFB44110000-0x00007FFB44BD2000-memory.dmp

Filesize
10.8MB

Download
memory/240-8-0x00007FFB44110000-0x00007FFB44BD2000-memory.dmp

Filesize
10.8MB

Download
memory/4068-9-0x00007FFB44110000-0x00007FFB44BD2000-memory.dmp

Filesize
10.8MB

Download
memory/4068-10-0x00007FFB44110000-0x00007FFB44BD2000-memory.dmp

Filesize
10.8MB

Download
memory/4068-11-0x000000001CB90000-0x000000001CBE0000-memory.dmp

Filesize
320KB

Download
memory/4068-12-0x000000001CCA0000-0x000000001CD52000-memory.dmp

Filesize
712KB

Download
memory/4068-13-0x00007FFB44110000-0x00007FFB44BD2000-memory.dmp

Filesize
10.8MB

Download