quasar | 781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

Analysis

max time kernel
2s
max time network
6s
platform
windows11-21h2_x64
resource
win11-20250207-en
resource tags

arch:x64arch:x86image:win11-20250207-enlocale:en-usos:windows11-21h2-x64system
submitted
08/02/2025, 02:42

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General

Target

Client-built.exe
Size

3.1MB
MD5

bb1c4dce21f5c456bd7a5e9fd4d97588
SHA1

591fae4f6bdebcaf83ccc1bea37113956b373ad1
SHA256

781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0
SHA512

a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c
SSDEEP

49152:ivkt62XlaSFNWPjljiFa2RoUYI5FRJ69bR3LoGdKbTHHB72eh2NT:iv462XlaSFNWPjljiFXRoUYI5FRJ6Pa

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

50e9068f-e8d9-4363-bf89-859954325430

Attributes

encryption_key
3F9AC61EC3C7AFC94074BECB23299DD92BEDC742
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/2964-1-0x0000000000530000-0x0000000000854000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002ae75-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2076	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
2492	schtasks.exe
2152	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2964	Client-built.exe
Token: SeDebugPrivilege	2076	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2076	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2964 wrote to memory of 2492	2964	Client-built.exe	85
PID 2964 wrote to memory of 2492	2964	Client-built.exe	85
PID 2964 wrote to memory of 2076	2964	Client-built.exe	87
PID 2964 wrote to memory of 2076	2964	Client-built.exe	87
PID 2076 wrote to memory of 2152	2076	Client.exe	88
PID 2076 wrote to memory of 2152	2076	Client.exe	88

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:2964
- 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:2492
- 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:2076
- - 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:2152

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
bb1c4dce21f5c456bd7a5e9fd4d97588

SHA1
591fae4f6bdebcaf83ccc1bea37113956b373ad1

SHA256
781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

SHA512
a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c

Download Submit
memory/2076-10-0x00007FFF4ED50000-0x00007FFF4F812000-memory.dmp

Filesize
10.8MB

Download
memory/2076-11-0x00007FFF4ED50000-0x00007FFF4F812000-memory.dmp

Filesize
10.8MB

Download
memory/2076-12-0x000000001C6C0000-0x000000001C710000-memory.dmp

Filesize
320KB

Download
memory/2076-13-0x000000001C7D0000-0x000000001C882000-memory.dmp

Filesize
712KB

Download
memory/2964-0-0x00007FFF4ED53000-0x00007FFF4ED55000-memory.dmp

Filesize
8KB

Download
memory/2964-1-0x0000000000530000-0x0000000000854000-memory.dmp

Filesize
3.1MB

Download
memory/2964-2-0x00007FFF4ED50000-0x00007FFF4F812000-memory.dmp

Filesize
10.8MB

Download
memory/2964-9-0x00007FFF4ED50000-0x00007FFF4F812000-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