quasar | 28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04

Analysis

max time kernel
131s
max time network
146s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 03:42

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General

Target

QL6FS_Client-built.exe
Size

3.1MB
MD5

bee705cc59266d8ab855c591599b0f09
SHA1

cb2ab1afc9bee0d41786559505abb7220b7f83c8
SHA256

28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04
SHA512

6971cb2c3ee9efad0e14b162a074b10820a3d0e49f27aeead26302b3e74413033512eb502447b39f0e5776f21c72b8feacd0d0035fefcdbfab72a805eb7d423b
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjHctflEmLek/znLVGdn7FTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHctfhLA7

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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/1056-1-0x00000000001D0000-0x00000000004F4000-memory.dmp	family_quasar
behavioral1/files/0x00150000000170f8-6.dat	family_quasar
behavioral1/memory/276-9-0x0000000000130000-0x0000000000454000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
276	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
2568	schtasks.exe
2868	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1056	QL6FS_Client-built.exe
Token: SeDebugPrivilege	276	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
276	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1056 wrote to memory of 2568	1056	QL6FS_Client-built.exe	29
PID 1056 wrote to memory of 2568	1056	QL6FS_Client-built.exe	29
PID 1056 wrote to memory of 2568	1056	QL6FS_Client-built.exe	29
PID 1056 wrote to memory of 276	1056	QL6FS_Client-built.exe	31
PID 1056 wrote to memory of 276	1056	QL6FS_Client-built.exe	31
PID 1056 wrote to memory of 276	1056	QL6FS_Client-built.exe	31
PID 276 wrote to memory of 2868	276	Client.exe	32
PID 276 wrote to memory of 2868	276	Client.exe	32
PID 276 wrote to memory of 2868	276	Client.exe	32

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\QL6FS_Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\QL6FS_Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1056
- 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:2568
- 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:276
- - 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:2868

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
bee705cc59266d8ab855c591599b0f09

SHA1
cb2ab1afc9bee0d41786559505abb7220b7f83c8

SHA256
28a1b5a0e4840bd853d1a9e8f4a48f36af3fd4f38c5cb8273a5fb3df67afcb04

SHA512
6971cb2c3ee9efad0e14b162a074b10820a3d0e49f27aeead26302b3e74413033512eb502447b39f0e5776f21c72b8feacd0d0035fefcdbfab72a805eb7d423b

Download Submit
memory/276-10-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/276-9-0x0000000000130000-0x0000000000454000-memory.dmp

Filesize
3.1MB

Download
memory/276-11-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/276-12-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/1056-0-0x000007FEF64B3000-0x000007FEF64B4000-memory.dmp

Filesize
4KB

Download
memory/1056-1-0x00000000001D0000-0x00000000004F4000-memory.dmp

Filesize
3.1MB

Download
memory/1056-2-0x000007FEF64B0000-0x000007FEF6E9C000-memory.dmp

Filesize
9.9MB

Download
memory/1056-8-0x000007FEF64B0000-0x000007FEF6E9C000-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