quasar | 6a97a356e44ccd5f33ac40934f77e796faca89403e2daae4f36c66ff52cbb22f

Analysis

max time kernel
127s
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
09-01-2025 09:33

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General

Target

image logger.exe
Size

3.1MB
MD5

c1681b5b8a3f9d40d46c6bdaaa66083d
SHA1

51e7ec6ba88909bd2de4ec9b36cc31948624e4f3
SHA256

6a97a356e44ccd5f33ac40934f77e796faca89403e2daae4f36c66ff52cbb22f
SHA512

8ce33bd2c8f40ae92acbae4898bfff51a699f91c8f70b212921fbfbf2bf9b523a4049ee421d7e0d559e29a4df6faa27707d03fa987917ce7077c635090be4fff
SSDEEP

49152:uvnI22SsaNYfdPBldt698dBcjHWFwGGBeFLoqdhuTHHB72eh2NT:uvI22SsaNYfdPBldt6+dBcjHTGX

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.18.43:4782

Mutex

8f30f04b-4a42-46fb-9c42-479d848d3ab8

Attributes

encryption_key
4767B12C6A8C8F78710F92C585FA862093584320
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/2496-1-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cd0-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4352	Client.exe

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

System Information Discovery
T1082

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
4560	schtasks.exe
3816	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2496	image logger.exe
Token: SeDebugPrivilege	4352	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4352	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4352	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4352	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2496 wrote to memory of 4560	2496	image logger.exe	83
PID 2496 wrote to memory of 4560	2496	image logger.exe	83
PID 2496 wrote to memory of 4352	2496	image logger.exe	85
PID 2496 wrote to memory of 4352	2496	image logger.exe	85
PID 4352 wrote to memory of 3816	4352	Client.exe	86
PID 4352 wrote to memory of 3816	4352	Client.exe	86

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\image logger.exe
"C:\Users\Admin\AppData\Local\Temp\image logger.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2496
- 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:4560
- 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
  - Suspicious use of WriteProcessMemory
  PID:4352
- - 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:3816

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

System Information Discovery

T1082

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
c1681b5b8a3f9d40d46c6bdaaa66083d

SHA1
51e7ec6ba88909bd2de4ec9b36cc31948624e4f3

SHA256
6a97a356e44ccd5f33ac40934f77e796faca89403e2daae4f36c66ff52cbb22f

SHA512
8ce33bd2c8f40ae92acbae4898bfff51a699f91c8f70b212921fbfbf2bf9b523a4049ee421d7e0d559e29a4df6faa27707d03fa987917ce7077c635090be4fff

Download Submit
memory/2496-0-0x00007FFA71813000-0x00007FFA71815000-memory.dmp

Filesize
8KB

Download
memory/2496-1-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2496-2-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/2496-9-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/4352-10-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/4352-11-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/4352-12-0x000000001BC80000-0x000000001BCD0000-memory.dmp

Filesize
320KB

Download
memory/4352-13-0x000000001BD90000-0x000000001BE42000-memory.dmp

Filesize
712KB

Download
memory/4352-14-0x00007FFA71810000-0x00007FFA722D1000-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