quasar | 4266be83abea2867cfa44836d014983f658f688a1f96fe74bed4b2b5f0d59c1b

Analysis

max time kernel
150s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2025, 04:20

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General

Target

0x000300000001e767-21.exe
Size

3.1MB
MD5

20eeb65678c6fcffcc30cc2fc429f572
SHA1

182305533e4a842da880cf204604456e838878db
SHA256

4266be83abea2867cfa44836d014983f658f688a1f96fe74bed4b2b5f0d59c1b
SHA512

f32cc7a2b5fde293bc9bb6e99c75b92d5725297f128a945f6edcb9ab4d6579ca388370bca5ddff1b5532d6b5e248641bf232a71af93aa031cb86097ed745a872
SSDEEP

49152:fveD/2oga6ctePEl3s3jn7HZkgyoRJ6ObR3LoGdPTHHB72eh2NT:fvY/2oga6ctePEl3s3L7HZkgyoRJ6I

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

epotiz-56104.portmap.host:56104

Mutex

dff263c5-5f46-4ebd-b314-af4f281b1196

Attributes

encryption_key
91AE6D01E5588CB2EC925069EE1425C401902592
install_name
Realtek HD Audio Manager.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Realtek HD Audio Manager
subdirectory
Realtek HD Audio Manager

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/1076-1-0x0000000000130000-0x0000000000454000-memory.dmp	family_quasar
behavioral2/files/0x0007000000024253-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5828	Realtek HD Audio Manager.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
2180	schtasks.exe
4808	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1076	0x000300000001e767-21.exe
Token: SeDebugPrivilege	5828	Realtek HD Audio Manager.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1076 wrote to memory of 2180	1076	0x000300000001e767-21.exe	89
PID 1076 wrote to memory of 2180	1076	0x000300000001e767-21.exe	89
PID 1076 wrote to memory of 5828	1076	0x000300000001e767-21.exe	91
PID 1076 wrote to memory of 5828	1076	0x000300000001e767-21.exe	91
PID 5828 wrote to memory of 4808	5828	Realtek HD Audio Manager.exe	92
PID 5828 wrote to memory of 4808	5828	Realtek HD Audio Manager.exe	92

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\0x000300000001e767-21.exe
"C:\Users\Admin\AppData\Local\Temp\0x000300000001e767-21.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1076
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Realtek HD Audio Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Manager\Realtek HD Audio Manager.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2180
- C:\Users\Admin\AppData\Roaming\Realtek HD Audio Manager\Realtek HD Audio Manager.exe
  "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Manager\Realtek HD Audio Manager.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5828
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Realtek HD Audio Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Manager\Realtek HD Audio Manager.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4808

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

C:\Users\Admin\AppData\Roaming\Realtek HD Audio Manager\Realtek HD Audio Manager.exe

Filesize
3.1MB

MD5
20eeb65678c6fcffcc30cc2fc429f572

SHA1
182305533e4a842da880cf204604456e838878db

SHA256
4266be83abea2867cfa44836d014983f658f688a1f96fe74bed4b2b5f0d59c1b

SHA512
f32cc7a2b5fde293bc9bb6e99c75b92d5725297f128a945f6edcb9ab4d6579ca388370bca5ddff1b5532d6b5e248641bf232a71af93aa031cb86097ed745a872

Download Submit
memory/1076-0-0x00007FFBB6253000-0x00007FFBB6255000-memory.dmp

Filesize
8KB

Download
memory/1076-1-0x0000000000130000-0x0000000000454000-memory.dmp

Filesize
3.1MB

Download
memory/1076-2-0x00007FFBB6250000-0x00007FFBB6D11000-memory.dmp

Filesize
10.8MB

Download
memory/1076-10-0x00007FFBB6250000-0x00007FFBB6D11000-memory.dmp

Filesize
10.8MB

Download
memory/5828-9-0x00007FFBB6250000-0x00007FFBB6D11000-memory.dmp

Filesize
10.8MB

Download
memory/5828-11-0x00007FFBB6250000-0x00007FFBB6D11000-memory.dmp

Filesize
10.8MB

Download
memory/5828-12-0x000000001B450000-0x000000001B4A0000-memory.dmp

Filesize
320KB

Download
memory/5828-13-0x000000001BB20000-0x000000001BBD2000-memory.dmp

Filesize
712KB

Download
memory/5828-14-0x00007FFBB6250000-0x00007FFBB6D11000-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