quasar | afe5f6d8d87bb93548faec17805bd3b68f8e7914ac07ad0bfa60ab465fdc5a0a

Analysis

max time kernel
199s
max time network
208s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
09/01/2025, 10:18

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General

Target

Bootstrapper v3.14.exe
Size

3.1MB
MD5

16f639c27fead4d665ab798bd4a8c457
SHA1

c596c009318ba3777e962661355a199b9b4ed5e7
SHA256

afe5f6d8d87bb93548faec17805bd3b68f8e7914ac07ad0bfa60ab465fdc5a0a
SHA512

ba71490f2433062dfd07bf84f6e85e06e9fad412e7baaa81c8519d32c09dd97316f3729ec1bc425c49f7eb95601499330baeb86abd7ea92ef071e39823d46ec8
SSDEEP

49152:mv3I22SsaNYfdPBldt698dBcjHw186GBxQ+oGdlR5THHB72eh2NT:mv422SsaNYfdPBldt6+dBcjHl6c

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.62.1:4782

Mutex

948fde50-66bb-4ffd-aeca-4cc76d13c423

Attributes

encryption_key
FE78C5AAB1B8DB7C1492A05B7A35D613C6807754
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
behavioral2/memory/340-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp	family_quasar
behavioral2/files/0x001a00000002aab5-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3764	Client.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
1268	schtasks.exe
1496	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	340	Bootstrapper v3.14.exe
Token: SeDebugPrivilege	3764	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3764	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 340 wrote to memory of 1268	340	Bootstrapper v3.14.exe	77
PID 340 wrote to memory of 1268	340	Bootstrapper v3.14.exe	77
PID 340 wrote to memory of 3764	340	Bootstrapper v3.14.exe	79
PID 340 wrote to memory of 3764	340	Bootstrapper v3.14.exe	79
PID 3764 wrote to memory of 1496	3764	Client.exe	80
PID 3764 wrote to memory of 1496	3764	Client.exe	80

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\Bootstrapper v3.14.exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper v3.14.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:340
- 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:1268
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3764
- - 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:1496

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3688

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

Filesize
3.1MB

MD5
16f639c27fead4d665ab798bd4a8c457

SHA1
c596c009318ba3777e962661355a199b9b4ed5e7

SHA256
afe5f6d8d87bb93548faec17805bd3b68f8e7914ac07ad0bfa60ab465fdc5a0a

SHA512
ba71490f2433062dfd07bf84f6e85e06e9fad412e7baaa81c8519d32c09dd97316f3729ec1bc425c49f7eb95601499330baeb86abd7ea92ef071e39823d46ec8

Download Submit
memory/340-0-0x00007FFDAF5C3000-0x00007FFDAF5C5000-memory.dmp

Filesize
8KB

Download
memory/340-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp

Filesize
3.1MB

Download
memory/340-2-0x00007FFDAF5C0000-0x00007FFDB0082000-memory.dmp

Filesize
10.8MB

Download
memory/340-8-0x00007FFDAF5C0000-0x00007FFDB0082000-memory.dmp

Filesize
10.8MB

Download
memory/3764-9-0x00007FFDAF5C0000-0x00007FFDB0082000-memory.dmp

Filesize
10.8MB

Download
memory/3764-10-0x00007FFDAF5C0000-0x00007FFDB0082000-memory.dmp

Filesize
10.8MB

Download
memory/3764-12-0x000000001C9A0000-0x000000001CA52000-memory.dmp

Filesize
712KB

Download
memory/3764-11-0x000000001C890000-0x000000001C8E0000-memory.dmp

Filesize
320KB

Download
memory/3764-13-0x00007FFDAF5C0000-0x00007FFDB0082000-memory.dmp

Filesize
10.8MB

Download
memory/3764-14-0x000000001D190000-0x000000001D6B8000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads