quasar | e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
27/03/2025, 21:33

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General

Target

Client-built.exe
Size

3.1MB
MD5

627472780aa08c81430c6e00a03a58b4
SHA1

5577504b7d6ff99497d5d5f546211a281583e349
SHA256

e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e
SHA512

dfac7c943bc97fae120bf9bc01749e10c25d83346091a7d3ffa9a57bf71561bc047583b4e9f45d1fbb7e8d35afc7dbde0e14f6b98982001c4b19bdd3bf44c15e
SSDEEP

49152:CvyI22SsaNYfdPBldt698dBcjHJiRJ61bR3LoGdl2THHB72eh2NT:Cvf22SsaNYfdPBldt6+dBcjHJiRJ6H

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.237.150:4782

Mutex

cca6f222-119d-4901-a7c0-415a3c461781

Attributes

encryption_key
A20ABDA3377B184B54624403E023FF2EBFFE49D6
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/1240-1-0x0000000000DA0000-0x00000000010C4000-memory.dmp	family_quasar
behavioral1/files/0x00090000000164b1-6.dat	family_quasar
behavioral1/memory/2356-9-0x00000000002A0000-0x00000000005C4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2356	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
1908	schtasks.exe
580	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1240	Client-built.exe
Token: SeDebugPrivilege	2356	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2356	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1240 wrote to memory of 1908	1240	Client-built.exe	30
PID 1240 wrote to memory of 1908	1240	Client-built.exe	30
PID 1240 wrote to memory of 1908	1240	Client-built.exe	30
PID 1240 wrote to memory of 2356	1240	Client-built.exe	32
PID 1240 wrote to memory of 2356	1240	Client-built.exe	32
PID 1240 wrote to memory of 2356	1240	Client-built.exe	32
PID 2356 wrote to memory of 580	2356	Client.exe	33
PID 2356 wrote to memory of 580	2356	Client.exe	33
PID 2356 wrote to memory of 580	2356	Client.exe	33

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:1240
- 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:1908
- 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:2356
- - 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:580

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
627472780aa08c81430c6e00a03a58b4

SHA1
5577504b7d6ff99497d5d5f546211a281583e349

SHA256
e8a8edfe33db5e5f64d809af4e09c178a4f24c3664c52256453f006f751fa67e

SHA512
dfac7c943bc97fae120bf9bc01749e10c25d83346091a7d3ffa9a57bf71561bc047583b4e9f45d1fbb7e8d35afc7dbde0e14f6b98982001c4b19bdd3bf44c15e

Download Submit
memory/1240-0-0x000007FEF52A3000-0x000007FEF52A4000-memory.dmp

Filesize
4KB

Download
memory/1240-1-0x0000000000DA0000-0x00000000010C4000-memory.dmp

Filesize
3.1MB

Download
memory/1240-2-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/1240-11-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2356-8-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2356-9-0x00000000002A0000-0x00000000005C4000-memory.dmp

Filesize
3.1MB

Download
memory/2356-10-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2356-12-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads