quasar | 31ea3fc3712ff925dc56d07e2cae38724e16acd8c1ac719cb5704b4f40da7e55

Analysis

max time kernel
119s
max time network
124s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
15-11-2024 19:31

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General

Target

Client-built(1).exe
Size

3.1MB
MD5

ef3e3811d92c8c39a9dbfa1b3d0dcece
SHA1

8238396252ae7c164c0bca49163040f236fd5148
SHA256

31ea3fc3712ff925dc56d07e2cae38724e16acd8c1ac719cb5704b4f40da7e55
SHA512

f9941d6b7680bac92de5c5af99ccbd4fca77e207330ec918a5a6c4b73a17ae228f4a53a21f33e5491e591ccd970fa0a0a82abacb926c235650c7702555a20a46
SSDEEP

49152:PvjI22SsaNYfdPBldt698dBcjHZGSxNESEjk/iGLoGd6CTHHB72eh2NT:Pvc22SsaNYfdPBldt6+dBcjH9x6I

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

146.0.191.34:4782

Mutex

89ec14d4-c260-40fa-a167-34d2cb269530

Attributes

encryption_key
55CC02601E58E75BE97D8FB498B201E77070B65F
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 1 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2208-1-0x0000000000010000-0x0000000000334000-memory.dmp	family_quasar

Drops file in Program Files directory 2 IoCs

Processes:

Client-built(1).exe

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	Client-built(1).exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built(1).exe

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

Processes:

schtasks.exe

pid	Process
2744	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

Client-built(1).exe

description	pid	Process
Token: SeDebugPrivilege	2208	Client-built(1).exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

Client-built(1).exe

description	pid	Process	procid_target
PID 2208 wrote to memory of 2744	2208	Client-built(1).exe	30
PID 2208 wrote to memory of 2744	2208	Client-built(1).exe	30
PID 2208 wrote to memory of 2744	2208	Client-built(1).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(1).exe
"C:\Users\Admin\AppData\Local\Temp\Client-built(1).exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2208
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2744

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

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Downloads

memory/2208-0-0x000007FEF5EB3000-0x000007FEF5EB4000-memory.dmp

Filesize
4KB

Download
memory/2208-1-0x0000000000010000-0x0000000000334000-memory.dmp

Filesize
3.1MB

Download
memory/2208-2-0x000007FEF5EB0000-0x000007FEF689C000-memory.dmp

Filesize
9.9MB

Download
memory/2208-4-0x000007FEF5EB3000-0x000007FEF5EB4000-memory.dmp

Filesize
4KB

Download
memory/2208-5-0x000007FEF5EB0000-0x000007FEF689C000-memory.dmp

Filesize
9.9MB

Download