quasar | 4d9705a277ea2a8de918dd0d05efa543f6e3efc0ddd6aa37ae140fdd028338fc

Analysis

max time kernel
58s
max time network
35s
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, 23:49

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General

Target

polrthujk.exe
Size

3.1MB
MD5

cb838b6eafe658027d563c2a67adbd37
SHA1

422e0bcc834cca0e8d349e08725b2ac4499fbd86
SHA256

4d9705a277ea2a8de918dd0d05efa543f6e3efc0ddd6aa37ae140fdd028338fc
SHA512

6c0eefaee665a2fc2f2b9b53995bafeae1959d5d356d2214a208fbe117cf676a0bc8352ffbfa390c6bf7148a34c3a58c34f7c81ed3b5c264602e5ef6ecfa3b99
SSDEEP

49152:evUt62XlaSFNWPjljiFa2RoUYIdlzfD4OdoGsbbTHHB72eh2NT:evI62XlaSFNWPjljiFXRoUYIdlzn

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

127.0.0.1:4040

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/4252-1-0x0000000000670000-0x0000000000994000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045066-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3312	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
2576	schtasks.exe
4452	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4252	polrthujk.exe
Token: SeDebugPrivilege	3312	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3312	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 2576	4252	polrthujk.exe	84
PID 4252 wrote to memory of 2576	4252	polrthujk.exe	84
PID 4252 wrote to memory of 3312	4252	polrthujk.exe	86
PID 4252 wrote to memory of 3312	4252	polrthujk.exe	86
PID 3312 wrote to memory of 4452	3312	Client.exe	87
PID 3312 wrote to memory of 4452	3312	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\polrthujk.exe
"C:\Users\Admin\AppData\Local\Temp\polrthujk.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4252
- 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:2576
- 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:3312
- - 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:4452

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
cb838b6eafe658027d563c2a67adbd37

SHA1
422e0bcc834cca0e8d349e08725b2ac4499fbd86

SHA256
4d9705a277ea2a8de918dd0d05efa543f6e3efc0ddd6aa37ae140fdd028338fc

SHA512
6c0eefaee665a2fc2f2b9b53995bafeae1959d5d356d2214a208fbe117cf676a0bc8352ffbfa390c6bf7148a34c3a58c34f7c81ed3b5c264602e5ef6ecfa3b99

Download Submit
memory/3312-5-0x00007FFFB4930000-0x00007FFFB53F2000-memory.dmp

Filesize
10.8MB

Download
memory/3312-7-0x00007FFFB4930000-0x00007FFFB53F2000-memory.dmp

Filesize
10.8MB

Download
memory/3312-8-0x000000001C930000-0x000000001C980000-memory.dmp

Filesize
320KB

Download
memory/3312-9-0x000000001CA40000-0x000000001CAF2000-memory.dmp

Filesize
712KB

Download
memory/3312-10-0x00007FFFB4930000-0x00007FFFB53F2000-memory.dmp

Filesize
10.8MB

Download
memory/4252-0-0x00007FFFB4933000-0x00007FFFB4935000-memory.dmp

Filesize
8KB

Download
memory/4252-1-0x0000000000670000-0x0000000000994000-memory.dmp

Filesize
3.1MB

Download
memory/4252-2-0x00007FFFB4930000-0x00007FFFB53F2000-memory.dmp

Filesize
10.8MB

Download
memory/4252-6-0x00007FFFB4930000-0x00007FFFB53F2000-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