quasar | 68b52e3b8059ac395391480ee05380bc45f150356e03e92bf99ba5ffb202f08b

Analysis

max time kernel
118s
max time network
130s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 02:48

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General

Target

Client-built.exe
Size

3.1MB
MD5

ff109ac27955a98afb5654e2a60ae88c
SHA1

c211375bd068d5fa44975af3e37bb39f80ed2b03
SHA256

68b52e3b8059ac395391480ee05380bc45f150356e03e92bf99ba5ffb202f08b
SHA512

8bed75e15768bce51b52828dd443249c2b6c3c426f880b57df0958477a986786b5fa99739356e72f94f03b026ac3ca64c699dd6511079f51bc037f4598aea358
SSDEEP

49152:evkt62XlaSFNWPjljiFa2RoUYIEuW/QBxB2oGdhTHHB72eh2NT:ev462XlaSFNWPjljiFXRoUYIs/v

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

50e9068f-e8d9-4363-bf89-859954325430

Attributes

encryption_key
3F9AC61EC3C7AFC94074BECB23299DD92BEDC742
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Bob
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/2844-1-0x0000000000CD0000-0x0000000000FF4000-memory.dmp	family_quasar

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3068	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2844	Client-built.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 2844 wrote to memory of 3068	2844	Client-built.exe	30
PID 2844 wrote to memory of 3068	2844	Client-built.exe	30
PID 2844 wrote to memory of 3068	2844	Client-built.exe	30

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:2844
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3068

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

memory/2844-0-0x000007FEF6503000-0x000007FEF6504000-memory.dmp

Filesize
4KB

Download
memory/2844-1-0x0000000000CD0000-0x0000000000FF4000-memory.dmp

Filesize
3.1MB

Download
memory/2844-2-0x000007FEF6500000-0x000007FEF6EEC000-memory.dmp

Filesize
9.9MB

Download
memory/2844-4-0x000007FEF6503000-0x000007FEF6504000-memory.dmp

Filesize
4KB

Download
memory/2844-5-0x000007FEF6500000-0x000007FEF6EEC000-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