quasar | 7e1efe889f6a1510ea7140ac35693ef30ba2c5747469d39de9accab7c8bf138f

Analysis

max time kernel
2s
max time network
6s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
04-02-2025 04:13

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General

Target

Client-built.exe
Size

3.1MB
MD5

a573c5b990e1aa0d4e504e934d804026
SHA1

77c8d83f14345918bb46faaf2127cf11ad7295bf
SHA256

7e1efe889f6a1510ea7140ac35693ef30ba2c5747469d39de9accab7c8bf138f
SHA512

ef7b042b169d9bbc8af0900997db4471dfa6a0504c4cc23315fd3b837a49d92d0926a2f80af39c88c167ea0b1aec978cc4aeee7ecd36db2cf7d1e0c8ba987e34
SSDEEP

49152:+vaY52fyaSZOrPWluWBuGG5g5h29LLmzrgoGdH3wTHHB72eh2NT:+vv52fyaSZOrPWluWBDG5g5h29LTX

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.0.34:4782

Mutex

366cc5a6-9875-43f5-b406-b422373aa69b

Attributes

encryption_key
13765B0E8E4F6CB0053DA8B5123C9FA10F47987B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
bob
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
behavioral1/memory/4476-1-0x0000000000360000-0x0000000000684000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002aae5-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3684	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
4116	schtasks.exe
4240	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4476	Client-built.exe
Token: SeDebugPrivilege	3684	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3684	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4476 wrote to memory of 4116	4476	Client-built.exe	77
PID 4476 wrote to memory of 4116	4476	Client-built.exe	77
PID 4476 wrote to memory of 3684	4476	Client-built.exe	79
PID 4476 wrote to memory of 3684	4476	Client-built.exe	79
PID 3684 wrote to memory of 4240	3684	Client.exe	80
PID 3684 wrote to memory of 4240	3684	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4476
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4116
- 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:3684
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4240

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
a573c5b990e1aa0d4e504e934d804026

SHA1
77c8d83f14345918bb46faaf2127cf11ad7295bf

SHA256
7e1efe889f6a1510ea7140ac35693ef30ba2c5747469d39de9accab7c8bf138f

SHA512
ef7b042b169d9bbc8af0900997db4471dfa6a0504c4cc23315fd3b837a49d92d0926a2f80af39c88c167ea0b1aec978cc4aeee7ecd36db2cf7d1e0c8ba987e34

Download Submit
memory/3684-10-0x00007FFCFBEF0000-0x00007FFCFC9B2000-memory.dmp

Filesize
10.8MB

Download
memory/3684-11-0x00007FFCFBEF0000-0x00007FFCFC9B2000-memory.dmp

Filesize
10.8MB

Download
memory/3684-12-0x000000001C280000-0x000000001C2D0000-memory.dmp

Filesize
320KB

Download
memory/3684-13-0x000000001C390000-0x000000001C442000-memory.dmp

Filesize
712KB

Download
memory/4476-0-0x00007FFCFBEF3000-0x00007FFCFBEF5000-memory.dmp

Filesize
8KB

Download
memory/4476-1-0x0000000000360000-0x0000000000684000-memory.dmp

Filesize
3.1MB

Download
memory/4476-2-0x00007FFCFBEF0000-0x00007FFCFC9B2000-memory.dmp

Filesize
10.8MB

Download
memory/4476-9-0x00007FFCFBEF0000-0x00007FFCFC9B2000-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