quasar | c1a0da5554f0b9f6869f7b9f74fd7cdc714c7afb69cc36ac4fbeb64ecb2a6bba

Analysis

max time kernel
31s
max time network
36s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
10-11-2024 23:51

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

yeiifsd.exe
Size

3.1MB
MD5

b96f34b2886c779fbb6ac0abdb109d31
SHA1

95049b5972383e62d542db1f403ae86197619950
SHA256

c1a0da5554f0b9f6869f7b9f74fd7cdc714c7afb69cc36ac4fbeb64ecb2a6bba
SHA512

0cf92ebeca7675d72cebd554225b778e49f57295ce63bf4b0261540b41249b419473d949015b423257df04be2bda96fc3f716d227879cb252aeccdc7d0516365
SSDEEP

49152:mv+lL26AaNeWgPhlmVqvMQ7XSKBCmymzZYoGd3THHB72eh2NT:mvuL26AaNeWgPhlmVqkQ7XSKBCm6

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

a007-190-104-116-8.ngrok-free.app:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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 2 IoCs

resource	yara_rule
behavioral1/memory/3680-1-0x0000000000FA0000-0x00000000012C4000-memory.dmp	family_quasar
behavioral1/files/0x002800000004514b-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3364	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
3684	schtasks.exe
1964	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3680	yeiifsd.exe
Token: SeDebugPrivilege	3364	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3364	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3680 wrote to memory of 3684	3680	yeiifsd.exe	83
PID 3680 wrote to memory of 3684	3680	yeiifsd.exe	83
PID 3680 wrote to memory of 3364	3680	yeiifsd.exe	85
PID 3680 wrote to memory of 3364	3680	yeiifsd.exe	85
PID 3364 wrote to memory of 1964	3364	Client.exe	88
PID 3364 wrote to memory of 1964	3364	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\yeiifsd.exe
"C:\Users\Admin\AppData\Local\Temp\yeiifsd.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3680
- 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:3684
- 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:3364
- - 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:1964

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
b96f34b2886c779fbb6ac0abdb109d31

SHA1
95049b5972383e62d542db1f403ae86197619950

SHA256
c1a0da5554f0b9f6869f7b9f74fd7cdc714c7afb69cc36ac4fbeb64ecb2a6bba

SHA512
0cf92ebeca7675d72cebd554225b778e49f57295ce63bf4b0261540b41249b419473d949015b423257df04be2bda96fc3f716d227879cb252aeccdc7d0516365

Download Submit
memory/3364-5-0x00007FFB13E30000-0x00007FFB148F2000-memory.dmp

Filesize
10.8MB

Download
memory/3364-7-0x00007FFB13E30000-0x00007FFB148F2000-memory.dmp

Filesize
10.8MB

Download
memory/3364-8-0x000000001B5F0000-0x000000001B640000-memory.dmp

Filesize
320KB

Download
memory/3364-9-0x000000001C710000-0x000000001C7C2000-memory.dmp

Filesize
712KB

Download
memory/3364-10-0x00007FFB13E30000-0x00007FFB148F2000-memory.dmp

Filesize
10.8MB

Download
memory/3680-0-0x00007FFB13E33000-0x00007FFB13E35000-memory.dmp

Filesize
8KB

Download
memory/3680-1-0x0000000000FA0000-0x00000000012C4000-memory.dmp

Filesize
3.1MB

Download
memory/3680-2-0x00007FFB13E30000-0x00007FFB148F2000-memory.dmp

Filesize
10.8MB

Download
memory/3680-6-0x00007FFB13E30000-0x00007FFB148F2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads