quasar | b6cdcfab216effdf7770f5393bfcc61fb91764bd2bc8952f581c84afb0cd64db

Analysis

max time kernel
131s
max time network
146s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 03:37

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General

Target

Client-built.exe
Size

3.1MB
MD5

69b3a49265fdbae9e0139cc629c2a58c
SHA1

f3b83db54564c5e072c37e1a525ddbf168277ad6
SHA256

b6cdcfab216effdf7770f5393bfcc61fb91764bd2bc8952f581c84afb0cd64db
SHA512

012bc3e8db5085a494eb0842b0e797b52d1f62938523f45a291bb4202f8f720a10a075dd76b4ba6898afe7b3d008c13b59e14fc5c1f17cabaa6d974d8f12ca99
SSDEEP

49152:CvyI22SsaNYfdPBldt698dBcjHnbRJ6kbR3LoGdDbTHHB72eh2NT:Cvf22SsaNYfdPBldt6+dBcjHnbRJ6u

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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/2604-1-0x0000000000D90000-0x00000000010B4000-memory.dmp	family_quasar
behavioral1/files/0x0030000000019326-6.dat	family_quasar
behavioral1/memory/2392-9-0x00000000001B0000-0x00000000004D4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2392	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
2964	schtasks.exe
2840	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	Client-built.exe
Token: SeDebugPrivilege	2392	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2392	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 2964	2604	Client-built.exe	29
PID 2604 wrote to memory of 2964	2604	Client-built.exe	29
PID 2604 wrote to memory of 2964	2604	Client-built.exe	29
PID 2604 wrote to memory of 2392	2604	Client-built.exe	31
PID 2604 wrote to memory of 2392	2604	Client-built.exe	31
PID 2604 wrote to memory of 2392	2604	Client-built.exe	31
PID 2392 wrote to memory of 2840	2392	Client.exe	32
PID 2392 wrote to memory of 2840	2392	Client.exe	32
PID 2392 wrote to memory of 2840	2392	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:2964
- 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:2392
- - 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:2840

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
69b3a49265fdbae9e0139cc629c2a58c

SHA1
f3b83db54564c5e072c37e1a525ddbf168277ad6

SHA256
b6cdcfab216effdf7770f5393bfcc61fb91764bd2bc8952f581c84afb0cd64db

SHA512
012bc3e8db5085a494eb0842b0e797b52d1f62938523f45a291bb4202f8f720a10a075dd76b4ba6898afe7b3d008c13b59e14fc5c1f17cabaa6d974d8f12ca99

Download Submit
memory/2392-8-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

Filesize
9.9MB

Download
memory/2392-9-0x00000000001B0000-0x00000000004D4000-memory.dmp

Filesize
3.1MB

Download
memory/2392-10-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

Filesize
9.9MB

Download
memory/2392-12-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-0-0x000007FEF6253000-0x000007FEF6254000-memory.dmp

Filesize
4KB

Download
memory/2604-1-0x0000000000D90000-0x00000000010B4000-memory.dmp

Filesize
3.1MB

Download
memory/2604-2-0x000007FEF6250000-0x000007FEF6C3C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-11-0x000007FEF6250000-0x000007FEF6C3C000-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