quasar | b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c

Analysis

max time kernel
149s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
27-12-2024 04:06

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General

Target

Client-built.exe
Size

3.1MB
MD5

7875137406f7a2a8ef308a0155274879
SHA1

950cdcf1c2a5432825d941224c99d399f2fa4ec6
SHA256

b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c
SHA512

f7ca3bc5197fa1711550a4bc880c42b35913292f1b1e4761912ba50a95357674b3735004076401b5bcf9af88c6e8c5be928d49b97f10ff039412a0d524d03a47
SSDEEP

49152:rvvI22SsaNYfdPBldt698dBcjH5oHSmztNoGd5THHB72eh2NT:rvg22SsaNYfdPBldt6+dBcjH5oHD

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

99.158.40.205:4782

Mutex

9b87aeaa-0335-4ea7-8b7c-669e8b94b68e

Attributes

encryption_key
EF070280F01636B40C0F0E99C1661A590CF4BA82
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/2868-1-0x00000000011E0000-0x0000000001504000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d13-5.dat	family_quasar
behavioral1/memory/316-8-0x0000000000B90000-0x0000000000EB4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
316	Client.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.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
2120	schtasks.exe
2112	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2868	Client-built.exe
Token: SeDebugPrivilege	316	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
316	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2868 wrote to memory of 2120	2868	Client-built.exe	28
PID 2868 wrote to memory of 2120	2868	Client-built.exe	28
PID 2868 wrote to memory of 2120	2868	Client-built.exe	28
PID 2868 wrote to memory of 316	2868	Client-built.exe	30
PID 2868 wrote to memory of 316	2868	Client-built.exe	30
PID 2868 wrote to memory of 316	2868	Client-built.exe	30
PID 316 wrote to memory of 2112	316	Client.exe	31
PID 316 wrote to memory of 2112	316	Client.exe	31
PID 316 wrote to memory of 2112	316	Client.exe	31

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⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2868
- 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:2120
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:316
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2112

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
7875137406f7a2a8ef308a0155274879

SHA1
950cdcf1c2a5432825d941224c99d399f2fa4ec6

SHA256
b03fe87bdc5b196912492fbbf7de2d5d052ba9be2387731c485d71aa72f2682c

SHA512
f7ca3bc5197fa1711550a4bc880c42b35913292f1b1e4761912ba50a95357674b3735004076401b5bcf9af88c6e8c5be928d49b97f10ff039412a0d524d03a47

Download Submit
memory/316-10-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/316-8-0x0000000000B90000-0x0000000000EB4000-memory.dmp

Filesize
3.1MB

Download
memory/316-9-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/316-11-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/2868-0-0x000007FEF5CF3000-0x000007FEF5CF4000-memory.dmp

Filesize
4KB

Download
memory/2868-1-0x00000000011E0000-0x0000000001504000-memory.dmp

Filesize
3.1MB

Download
memory/2868-2-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/2868-7-0x000007FEF5CF0000-0x000007FEF66DC000-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