quasar | e278b36305e60e18a29c4b388248a78bd9c58fabc17fa9943392c43e7a49588e

Analysis

max time kernel
149s
max time network
135s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 15:02

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General

Target

Cleaner.exe
Size

3.1MB
MD5

f1f656fdd0c4224b3900a4c2d50443e6
SHA1

9b2879d91a63e6437ec7b47a5c39dd5cc64c9df3
SHA256

e278b36305e60e18a29c4b388248a78bd9c58fabc17fa9943392c43e7a49588e
SHA512

2b8ea438b308c94d463f06c8a04da1fa292f448b6f024e59423a1df5f5693b4957d12ffef6d03679f2d4a0c93d93ba16d8acf5c74f694f3a1a5b91aae1d378cf
SSDEEP

49152:GvyI22SsaNYfdPBldt698dBcjHlCy1JzLoGdZTHHB72eh2NT:Gvf22SsaNYfdPBldt6+dBcjHlCm

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.145:4782

Mutex

9d952f82-b8b7-4948-b2b7-53c225a63ebb

Attributes

encryption_key
AAB9DCB0841C8C889A6BCA76764D0770416B2FE1
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 3 IoCs

resource	yara_rule
behavioral1/memory/1272-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015d59-6.dat	family_quasar
behavioral1/memory/2344-10-0x0000000000150000-0x0000000000474000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2344	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
2660	schtasks.exe
1268	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1272	Cleaner.exe
Token: SeDebugPrivilege	2344	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2344	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1272 wrote to memory of 2660	1272	Cleaner.exe	30
PID 1272 wrote to memory of 2660	1272	Cleaner.exe	30
PID 1272 wrote to memory of 2660	1272	Cleaner.exe	30
PID 1272 wrote to memory of 2344	1272	Cleaner.exe	32
PID 1272 wrote to memory of 2344	1272	Cleaner.exe	32
PID 1272 wrote to memory of 2344	1272	Cleaner.exe	32
PID 2344 wrote to memory of 1268	2344	Client.exe	33
PID 2344 wrote to memory of 1268	2344	Client.exe	33
PID 2344 wrote to memory of 1268	2344	Client.exe	33

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\Cleaner.exe
"C:\Users\Admin\AppData\Local\Temp\Cleaner.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1272
- 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:2660
- 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:2344
- - 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:1268

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
f1f656fdd0c4224b3900a4c2d50443e6

SHA1
9b2879d91a63e6437ec7b47a5c39dd5cc64c9df3

SHA256
e278b36305e60e18a29c4b388248a78bd9c58fabc17fa9943392c43e7a49588e

SHA512
2b8ea438b308c94d463f06c8a04da1fa292f448b6f024e59423a1df5f5693b4957d12ffef6d03679f2d4a0c93d93ba16d8acf5c74f694f3a1a5b91aae1d378cf

Download Submit
memory/1272-0-0x000007FEF5D03000-0x000007FEF5D04000-memory.dmp

Filesize
4KB

Download
memory/1272-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp

Filesize
3.1MB

Download
memory/1272-2-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/1272-8-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-10-0x0000000000150000-0x0000000000474000-memory.dmp

Filesize
3.1MB

Download
memory/2344-9-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-11-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-12-0x000007FEF5D00000-0x000007FEF66EC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads