quasar | 0fe81f9a51cf0068408de3c3605ce2033a00bd7ec90cc9516c38f6069e06433b

Analysis

max time kernel
63s
max time network
67s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
04-11-2024 18:45

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General

Target

kreo q zi.exe
Size

3.1MB
MD5

28ac02fc40c8f1c2a8989ee3c09a1372
SHA1

b182758b62a1482142c0fce4be78c786e08b7025
SHA256

0fe81f9a51cf0068408de3c3605ce2033a00bd7ec90cc9516c38f6069e06433b
SHA512

2cbf2f6af46e5fae8e67144e1ac70bc748036c7adb7f7810d7d7d9f255ccf5d163cce07f11fb6526f9ab61c39f28bdf2356cc315b19a61cd2115612882eab767
SSDEEP

49152:7v+lL26AaNeWgPhlmVqvMQ7XSKsxRJ6wbR3LoGdGTHHB72eh2NT:7vuL26AaNeWgPhlmVqkQ7XSKsxRJ6K

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

hola435-24858.portmap.host:24858

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

Processes:

resource	yara_rule
behavioral1/memory/4500-1-0x0000000000930000-0x0000000000C54000-memory.dmp	family_quasar
behavioral1/files/0x0029000000045036-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
4680	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

Processes:

schtasks.exeschtasks.exe

pid	Process
2368	schtasks.exe
3268	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

kreo q zi.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	4500	kreo q zi.exe
Token: SeDebugPrivilege	4680	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
4680	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

kreo q zi.exeClient.exe

description	pid	Process	procid_target
PID 4500 wrote to memory of 2368	4500	kreo q zi.exe	83
PID 4500 wrote to memory of 2368	4500	kreo q zi.exe	83
PID 4500 wrote to memory of 4680	4500	kreo q zi.exe	85
PID 4500 wrote to memory of 4680	4500	kreo q zi.exe	85
PID 4680 wrote to memory of 3268	4680	Client.exe	86
PID 4680 wrote to memory of 3268	4680	Client.exe	86

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\kreo q zi.exe
"C:\Users\Admin\AppData\Local\Temp\kreo q zi.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4500
- 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:2368
- 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:4680
- - 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:3268

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
28ac02fc40c8f1c2a8989ee3c09a1372

SHA1
b182758b62a1482142c0fce4be78c786e08b7025

SHA256
0fe81f9a51cf0068408de3c3605ce2033a00bd7ec90cc9516c38f6069e06433b

SHA512
2cbf2f6af46e5fae8e67144e1ac70bc748036c7adb7f7810d7d7d9f255ccf5d163cce07f11fb6526f9ab61c39f28bdf2356cc315b19a61cd2115612882eab767

Download Submit
memory/4500-0-0x00007FFECE453000-0x00007FFECE455000-memory.dmp

Filesize
8KB

Download
memory/4500-1-0x0000000000930000-0x0000000000C54000-memory.dmp

Filesize
3.1MB

Download
memory/4500-2-0x00007FFECE450000-0x00007FFECEF12000-memory.dmp

Filesize
10.8MB

Download
memory/4500-5-0x00007FFECE450000-0x00007FFECEF12000-memory.dmp

Filesize
10.8MB

Download
memory/4680-6-0x00007FFECE450000-0x00007FFECEF12000-memory.dmp

Filesize
10.8MB

Download
memory/4680-7-0x00007FFECE450000-0x00007FFECEF12000-memory.dmp

Filesize
10.8MB

Download
memory/4680-8-0x000000001BB50000-0x000000001BBA0000-memory.dmp

Filesize
320KB

Download
memory/4680-9-0x000000001CC90000-0x000000001CD42000-memory.dmp

Filesize
712KB

Download
memory/4680-12-0x000000001CBD0000-0x000000001CBE2000-memory.dmp

Filesize
72KB

Download
memory/4680-13-0x000000001CC30000-0x000000001CC6C000-memory.dmp

Filesize
240KB

Download
memory/4680-14-0x00007FFECE450000-0x00007FFECEF12000-memory.dmp

Filesize
10.8MB

Download