quasar | 6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853

Analysis

max time kernel
149s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
03-01-2025 03:36

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General

Target

6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe
Size

3.1MB
MD5

b7626d89b385c029db4666f162c25d48
SHA1

3c0b0e61ca49c7e0d394f4936757403dc74bf3c8
SHA256

6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853
SHA512

9234c0895237433ec0ab0dfde4f9ec957816e453c2b0f0f106185ea40954e5a353a0762e5b88e4d603bbaf20748dab4aca60a7c2f745b33ff3b7248aab102ad2
SSDEEP

49152:Kvkt62XlaSFNWPjljiFa2RoUYIuARJ6obR3LoGdcgJTHHB72eh2NT:Kv462XlaSFNWPjljiFXRoUYIuARJ6Cj

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

38.242.241.140:4782

Mutex

4b387528-97ec-466a-915c-099747a4eb75

Attributes

encryption_key
E3FC55CEBE0920BC04F0B9E76DF59B61B3B7C9EA
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Essentials
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/1168-1-0x0000000000EF0000-0x0000000001214000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c93-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3520	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
3012	schtasks.exe
396	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1168	6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe
Token: SeDebugPrivilege	3520	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3520	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1168 wrote to memory of 3012	1168	6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe	82
PID 1168 wrote to memory of 3012	1168	6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe	82
PID 1168 wrote to memory of 3520	1168	6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe	84
PID 1168 wrote to memory of 3520	1168	6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe	84
PID 3520 wrote to memory of 396	3520	Client.exe	85
PID 3520 wrote to memory of 396	3520	Client.exe	85

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\6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe
"C:\Users\Admin\AppData\Local\Temp\6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1168
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Essentials" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3012
- 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:3520
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Essentials" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:396

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
b7626d89b385c029db4666f162c25d48

SHA1
3c0b0e61ca49c7e0d394f4936757403dc74bf3c8

SHA256
6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853

SHA512
9234c0895237433ec0ab0dfde4f9ec957816e453c2b0f0f106185ea40954e5a353a0762e5b88e4d603bbaf20748dab4aca60a7c2f745b33ff3b7248aab102ad2

Download Submit
memory/1168-0-0x00007FF8563B3000-0x00007FF8563B5000-memory.dmp

Filesize
8KB

Download
memory/1168-1-0x0000000000EF0000-0x0000000001214000-memory.dmp

Filesize
3.1MB

Download
memory/1168-2-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/1168-10-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3520-9-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3520-11-0x00007FF8563B0000-0x00007FF856E71000-memory.dmp

Filesize
10.8MB

Download
memory/3520-12-0x000000001C3C0000-0x000000001C410000-memory.dmp

Filesize
320KB

Download
memory/3520-13-0x000000001C4D0000-0x000000001C582000-memory.dmp

Filesize
712KB

Download
memory/3520-14-0x00007FF8563B0000-0x00007FF856E71000-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