quasar | c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
22-01-2025 22:51

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

Client-built.exe
Size

3.1MB
MD5

9c5ec5683c91176f1146cbc9b427e518
SHA1

2eccfa9607f1a9023079c4f88aa72b5a552bed70
SHA256

c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82
SHA512

5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc
SSDEEP

49152:mvyI22SsaNYfdPBldt698dBcjHll6bs1JGLoGdd8FiTHHB72eh2NT:mvf22SsaNYfdPBldt6+dBcjHWbb

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.12:4782

Mutex

0372494a-0bed-4fef-b80b-1e5a15a502c1

Attributes

encryption_key
C79910CC46FB1EA158892672F174AE58510A5B0F
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 3 IoCs

resource	yara_rule
behavioral1/memory/2604-1-0x0000000001350000-0x0000000001674000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016ae9-6.dat	family_quasar
behavioral1/memory/2288-9-0x0000000000960000-0x0000000000C84000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2288	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
2844	schtasks.exe
2860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	Client-built.exe
Token: SeDebugPrivilege	2288	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2288	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 2844	2604	Client-built.exe	29
PID 2604 wrote to memory of 2844	2604	Client-built.exe	29
PID 2604 wrote to memory of 2844	2604	Client-built.exe	29
PID 2604 wrote to memory of 2288	2604	Client-built.exe	31
PID 2604 wrote to memory of 2288	2604	Client-built.exe	31
PID 2604 wrote to memory of 2288	2604	Client-built.exe	31
PID 2288 wrote to memory of 2860	2288	Client.exe	32
PID 2288 wrote to memory of 2860	2288	Client.exe	32
PID 2288 wrote to memory of 2860	2288	Client.exe	32

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:2604
- 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:2844
- 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:2288
- - 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:2860

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

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
9c5ec5683c91176f1146cbc9b427e518

SHA1
2eccfa9607f1a9023079c4f88aa72b5a552bed70

SHA256
c6f8be78988d98bbc1f083b60acec86fed6259515277bc74b1eb138d1c151c82

SHA512
5aa2bc8d741b10e1d94431db71e69d6d19f1ca52cafc3580c2efcae45c82d74932b42a969a9ef69973aaa799809cef648477fae5356f456953d29335fe854fcc

Download Submit
memory/2288-9-0x0000000000960000-0x0000000000C84000-memory.dmp

Filesize
3.1MB

Download
memory/2288-11-0x000007FEF5790000-0x000007FEF617C000-memory.dmp

Filesize
9.9MB

Download
memory/2288-10-0x000007FEF5790000-0x000007FEF617C000-memory.dmp

Filesize
9.9MB

Download
memory/2288-12-0x000007FEF5790000-0x000007FEF617C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-0-0x000007FEF5793000-0x000007FEF5794000-memory.dmp

Filesize
4KB

Download
memory/2604-1-0x0000000001350000-0x0000000001674000-memory.dmp

Filesize
3.1MB

Download
memory/2604-2-0x000007FEF5790000-0x000007FEF617C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-8-0x000007FEF5790000-0x000007FEF617C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads