quasar | 319f3d6b92ec7d20d9920d1e9f2cc67a2ce689335a748746fe38f37a16868e4e

Analysis

max time kernel
126s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
20/12/2024, 23:31

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General

Target

Client-built.exe
Size

3.1MB
MD5

40fa1552520311d0c0770ba34d964602
SHA1

02223b59b2a18f2c55fd94a2f4c2ed9a596790e0
SHA256

6c6c7f83572cc8b39070e23ff5d8b25da332e51e989d7b65d32f52bd7d86c2f9
SHA512

e1ed2fab4a401783dd942a1af20f682244a387fd898078f19eacbb1fea151e9b6667b8a447a7ef835352ff14b5ca27433c7bf2dd40c129c448a38b295c8b9677
SSDEEP

49152:uvyI22SsaNYfdPBldt698dBcjHgaZwGs6loGdtYCTHHB72eh2NT:uvf22SsaNYfdPBldt6+dBcjHgUwGsuu

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.14:4782

Mutex

0c87075a-1709-4bbf-b370-fda5b6d1d98e

Attributes

encryption_key
8964B598D8DCA54C855C6A0315930A7B1DEA3A38
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/3316-1-0x00000000006A0000-0x00000000009C4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023cab-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4068	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
2876	schtasks.exe
4316	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3316	Client-built.exe
Token: SeDebugPrivilege	4068	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4068	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3316 wrote to memory of 4316	3316	Client-built.exe	85
PID 3316 wrote to memory of 4316	3316	Client-built.exe	85
PID 3316 wrote to memory of 4068	3316	Client-built.exe	87
PID 3316 wrote to memory of 4068	3316	Client-built.exe	87
PID 4068 wrote to memory of 2876	4068	Client.exe	88
PID 4068 wrote to memory of 2876	4068	Client.exe	88

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:3316
- 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:4316
- 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:4068
- - 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:2876

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
40fa1552520311d0c0770ba34d964602

SHA1
02223b59b2a18f2c55fd94a2f4c2ed9a596790e0

SHA256
6c6c7f83572cc8b39070e23ff5d8b25da332e51e989d7b65d32f52bd7d86c2f9

SHA512
e1ed2fab4a401783dd942a1af20f682244a387fd898078f19eacbb1fea151e9b6667b8a447a7ef835352ff14b5ca27433c7bf2dd40c129c448a38b295c8b9677

Download Submit
memory/3316-0-0x00007FFDF70D3000-0x00007FFDF70D5000-memory.dmp

Filesize
8KB

Download
memory/3316-1-0x00000000006A0000-0x00000000009C4000-memory.dmp

Filesize
3.1MB

Download
memory/3316-2-0x00007FFDF70D0000-0x00007FFDF7B91000-memory.dmp

Filesize
10.8MB

Download
memory/3316-10-0x00007FFDF70D0000-0x00007FFDF7B91000-memory.dmp

Filesize
10.8MB

Download
memory/4068-9-0x00007FFDF70D0000-0x00007FFDF7B91000-memory.dmp

Filesize
10.8MB

Download
memory/4068-11-0x00007FFDF70D0000-0x00007FFDF7B91000-memory.dmp

Filesize
10.8MB

Download
memory/4068-12-0x000000001BA30000-0x000000001BA80000-memory.dmp

Filesize
320KB

Download
memory/4068-13-0x000000001C8B0000-0x000000001C962000-memory.dmp

Filesize
712KB

Download
memory/4068-14-0x00007FFDF70D0000-0x00007FFDF7B91000-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