quasar | d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d

Analysis

max time kernel
101s
max time network
117s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
05-01-2025 06:33

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General

Target

Client-built.exe
Size

3.1MB
MD5

d6edcd97a141f64fe46289bf6bbf3a8f
SHA1

8cd43e6311f3b62bfba522c25315d1e737d265e3
SHA256

d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d
SHA512

664fe3111b738f56ab36f27cd01a99386e75193b0bc9cc40782e6480a9117ed0e47f471c27b208d9a8cc5d667f8ccb14627273af87915f8953658a0744443885
SSDEEP

49152:OvVt62XlaSFNWPjljiFa2RoUYI2jSJ1JZQoGd6THHB72eh2NT:Ovn62XlaSFNWPjljiFXRoUYI2jS4

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.132:4782

Mutex

87a4bbe1-6583-48dd-943b-4f569edd0b04

Attributes

encryption_key
AA6FC0D7B31977C5D714222F90C7F94D36193E6F
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Discord
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/2932-1-0x0000000000700000-0x0000000000A24000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cd0-4.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3488	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
1768	schtasks.exe
2360	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2932	Client-built.exe
Token: SeDebugPrivilege	3488	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3488	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3488	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3488	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 1768	2932	Client-built.exe	83
PID 2932 wrote to memory of 1768	2932	Client-built.exe	83
PID 2932 wrote to memory of 3488	2932	Client-built.exe	85
PID 2932 wrote to memory of 3488	2932	Client-built.exe	85
PID 3488 wrote to memory of 2360	3488	Client.exe	86
PID 3488 wrote to memory of 2360	3488	Client.exe	86

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 System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2932
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1768
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3488
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2360

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
d6edcd97a141f64fe46289bf6bbf3a8f

SHA1
8cd43e6311f3b62bfba522c25315d1e737d265e3

SHA256
d84cb257d1647aaf06f6cb154bc7bdd9e542751d3373dce4986b4a3712deed5d

SHA512
664fe3111b738f56ab36f27cd01a99386e75193b0bc9cc40782e6480a9117ed0e47f471c27b208d9a8cc5d667f8ccb14627273af87915f8953658a0744443885

Download Submit
memory/2932-0-0x00007FFA71813000-0x00007FFA71815000-memory.dmp

Filesize
8KB

Download
memory/2932-1-0x0000000000700000-0x0000000000A24000-memory.dmp

Filesize
3.1MB

Download
memory/2932-2-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/2932-8-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/3488-9-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/3488-10-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download
memory/3488-11-0x000000001BD00000-0x000000001BD50000-memory.dmp

Filesize
320KB

Download
memory/3488-12-0x000000001BE10000-0x000000001BEC2000-memory.dmp

Filesize
712KB

Download
memory/3488-13-0x00007FFA71810000-0x00007FFA722D1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads