quasar | 4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112

Analysis

max time kernel
125s
max time network
142s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
31/10/2024, 06:35

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General

Target

Client-built.exe
Size

3.1MB
MD5

ab1979896105bac4ca36869f682ae4e6
SHA1

524c924cf54fc2cb271806fb812753664468d480
SHA256

4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112
SHA512

c3c87d91127a9e57cf9808775fe4306dbe0d41c969060246a60937ab04d630015ec7e9308ed164541705027a38118f3274b5851b9d95635052029cf6ade28a03
SSDEEP

49152:Cv3I22SsaNYfdPBldt698dBcjHBxOEMkDk/Jx7oGdmTHHB72eh2NT:Cv422SsaNYfdPBldt6+dBcjHBxmV

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.127.0.200:4782

Mutex

975d3cc6-ab1f-4679-b834-3e8efe46f975

Attributes

encryption_key
433895AE7B4C5D8EF94D36D167293A1C1914DBFB
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 2 IoCs

resource	yara_rule
behavioral1/memory/928-1-0x0000000000160000-0x0000000000484000-memory.dmp	family_quasar
behavioral1/files/0x00280000000450ca-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3476	Client.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
1056	schtasks.exe
1712	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	928	Client-built.exe
Token: SeDebugPrivilege	3476	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3476	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3476	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 928 wrote to memory of 1056	928	Client-built.exe	84
PID 928 wrote to memory of 1056	928	Client-built.exe	84
PID 928 wrote to memory of 3476	928	Client-built.exe	86
PID 928 wrote to memory of 3476	928	Client-built.exe	86
PID 3476 wrote to memory of 1712	3476	Client.exe	87
PID 3476 wrote to memory of 1712	3476	Client.exe	87

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:928
- 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:1056
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:3476
- - 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:1712

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:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
ab1979896105bac4ca36869f682ae4e6

SHA1
524c924cf54fc2cb271806fb812753664468d480

SHA256
4cf9ad714c5b87300da61b54e8b3f2c7c8179834ca22f4df8a7fa75e7474d112

SHA512
c3c87d91127a9e57cf9808775fe4306dbe0d41c969060246a60937ab04d630015ec7e9308ed164541705027a38118f3274b5851b9d95635052029cf6ade28a03

Download Submit
memory/928-0-0x00007FFCF4243000-0x00007FFCF4245000-memory.dmp

Filesize
8KB

Download
memory/928-1-0x0000000000160000-0x0000000000484000-memory.dmp

Filesize
3.1MB

Download
memory/928-2-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

Filesize
10.8MB

Download
memory/928-5-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

Filesize
10.8MB

Download
memory/3476-6-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

Filesize
10.8MB

Download
memory/3476-7-0x00007FFCF4240000-0x00007FFCF4D02000-memory.dmp

Filesize
10.8MB

Download
memory/3476-8-0x000000001C920000-0x000000001C970000-memory.dmp

Filesize
320KB

Download
memory/3476-9-0x000000001CA30000-0x000000001CAE2000-memory.dmp

Filesize
712KB

Download
memory/3476-10-0x00007FFCF4240000-0x00007FFCF4D02000-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