quasar | 37c354b78bac35fcb8ea01381e4bbc0013c3d462414c2246a26797790362b50a

Analysis

max time kernel
101s
max time network
111s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250113-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
15-01-2025 01:53

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General

Target

ConnectToServer.exe
Size

3.1MB
MD5

622f266e2d1ca12b98a9f553bc38f366
SHA1

7c042256bf6f26ef421012a9dcd23b5cec63b738
SHA256

37c354b78bac35fcb8ea01381e4bbc0013c3d462414c2246a26797790362b50a
SHA512

23f704937ac1ae19edf5215474da6a31411b94dfc6572d45cb51a6fd6fbd464cb39d59eaaee7c12dc890d29177f3abe3e85c87693dc4f8d3f5f0b351a2a855d9
SSDEEP

49152:DvCI22SsaNYfdPBldt698dBcjHLb4OZjDvJuJoGdinTHHB72eh2NT:DvP22SsaNYfdPBldt6+dBcjHPjQS

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

hi-tin.gl.at.ply.gg:14413

Mutex

a7a63354-73e8-4f60-93c0-dfe7bb74afe3

Attributes

encryption_key
00B725E3944DCC9CC2ADDC0820F57FE1981B6AC6
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/2236-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
behavioral1/files/0x002800000004610d-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4580	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
1728	schtasks.exe
3244	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	ConnectToServer.exe
Token: SeDebugPrivilege	4580	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 1728	2236	ConnectToServer.exe	84
PID 2236 wrote to memory of 1728	2236	ConnectToServer.exe	84
PID 2236 wrote to memory of 4580	2236	ConnectToServer.exe	86
PID 2236 wrote to memory of 4580	2236	ConnectToServer.exe	86
PID 4580 wrote to memory of 3244	4580	Client.exe	87
PID 4580 wrote to memory of 3244	4580	Client.exe	87

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\ConnectToServer.exe
"C:\Users\Admin\AppData\Local\Temp\ConnectToServer.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2236
- 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:1728
- 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 WriteProcessMemory
  PID:4580
- - 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:3244

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
622f266e2d1ca12b98a9f553bc38f366

SHA1
7c042256bf6f26ef421012a9dcd23b5cec63b738

SHA256
37c354b78bac35fcb8ea01381e4bbc0013c3d462414c2246a26797790362b50a

SHA512
23f704937ac1ae19edf5215474da6a31411b94dfc6572d45cb51a6fd6fbd464cb39d59eaaee7c12dc890d29177f3abe3e85c87693dc4f8d3f5f0b351a2a855d9

Download Submit
memory/2236-5-0x00007FF99B960000-0x00007FF99C422000-memory.dmp

Filesize
10.8MB

Download
memory/2236-1-0x0000000000D70000-0x0000000001094000-memory.dmp

Filesize
3.1MB

Download
memory/2236-2-0x00007FF99B960000-0x00007FF99C422000-memory.dmp

Filesize
10.8MB

Download
memory/2236-0-0x00007FF99B963000-0x00007FF99B965000-memory.dmp

Filesize
8KB

Download
memory/4580-7-0x00007FF99B960000-0x00007FF99C422000-memory.dmp

Filesize
10.8MB

Download
memory/4580-6-0x00007FF99B960000-0x00007FF99C422000-memory.dmp

Filesize
10.8MB

Download
memory/4580-9-0x000000001C980000-0x000000001CA32000-memory.dmp

Filesize
712KB

Download
memory/4580-8-0x000000001B6C0000-0x000000001B710000-memory.dmp

Filesize
320KB

Download
memory/4580-11-0x000000001C8C0000-0x000000001C8FC000-memory.dmp

Filesize
240KB

Download
memory/4580-10-0x000000001B690000-0x000000001B6A2000-memory.dmp

Filesize
72KB

Download
memory/4580-13-0x000000001CE80000-0x000000001CF7F000-memory.dmp

Filesize
1020KB

Download
memory/4580-14-0x00007FF99B960000-0x00007FF99C422000-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