quasar | a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9

Analysis

max time kernel
125s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
27/03/2025, 16:43

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General

Target

Client-built.exe
Size

3.1MB
MD5

d99d7d556d5021fbd6926bc2dbf937cb
SHA1

a84dba6c50fb7a9fb96a88034a0b0beca902d816
SHA256

a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9
SHA512

41b1f8b7887d6288bdc868ce941c2368e576503c272e0a48f9c662e67ee253ea62c5cef3a34a25d15515e37175465c281f8219450542c18db7d5326423cae8c9
SSDEEP

49152:Wvkt62XlaSFNWPjljiFa2RoUYI59RJ6ubR3LoGdroTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYI59RJ6ob

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.20:4782

Mutex

09fd8aa4-f8ef-40d0-96f7-029c82b74a3a

Attributes

encryption_key
5FA4C5B780FA0149296752FBE0A794A5BF0E5B11
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
dont mind this
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/4904-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp	family_quasar
behavioral2/files/0x00080000000240ae-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3652	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
4080	schtasks.exe
4672	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4904	Client-built.exe
Token: SeDebugPrivilege	3652	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3652	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4904 wrote to memory of 4080	4904	Client-built.exe	89
PID 4904 wrote to memory of 4080	4904	Client-built.exe	89
PID 4904 wrote to memory of 3652	4904	Client-built.exe	91
PID 4904 wrote to memory of 3652	4904	Client-built.exe	91
PID 3652 wrote to memory of 4672	3652	Client.exe	92
PID 3652 wrote to memory of 4672	3652	Client.exe	92

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:4904
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dont mind this " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4080
- 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:3652
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "dont mind this " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4672

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
d99d7d556d5021fbd6926bc2dbf937cb

SHA1
a84dba6c50fb7a9fb96a88034a0b0beca902d816

SHA256
a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9

SHA512
41b1f8b7887d6288bdc868ce941c2368e576503c272e0a48f9c662e67ee253ea62c5cef3a34a25d15515e37175465c281f8219450542c18db7d5326423cae8c9

Download Submit
memory/3652-10-0x00007FFE8D680000-0x00007FFE8E141000-memory.dmp

Filesize
10.8MB

Download
memory/3652-11-0x00007FFE8D680000-0x00007FFE8E141000-memory.dmp

Filesize
10.8MB

Download
memory/3652-12-0x000000001B8B0000-0x000000001B900000-memory.dmp

Filesize
320KB

Download
memory/3652-13-0x000000001B9C0000-0x000000001BA72000-memory.dmp

Filesize
712KB

Download
memory/3652-14-0x00007FFE8D680000-0x00007FFE8E141000-memory.dmp

Filesize
10.8MB

Download
memory/4904-0-0x00007FFE8D683000-0x00007FFE8D685000-memory.dmp

Filesize
8KB

Download
memory/4904-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp

Filesize
3.1MB

Download
memory/4904-2-0x00007FFE8D680000-0x00007FFE8E141000-memory.dmp

Filesize
10.8MB

Download
memory/4904-9-0x00007FFE8D680000-0x00007FFE8E141000-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