quasar | 3ea391b2d054781eee918dc893a9e2188d0bfa5b81e569ba782e45c7cdc0578c

Analysis

max time kernel
102s
max time network
104s
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 23:07

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General

Target

anti vairus 2.exe
Size

3.1MB
MD5

8d55ff61779a99eb62783ca01e4636ac
SHA1

322d7aa8772513e89adb2322e95fb371365972e4
SHA256

3ea391b2d054781eee918dc893a9e2188d0bfa5b81e569ba782e45c7cdc0578c
SHA512

3be71c9277f0dee2861842c854bffa286f562853f5fa20e72833a9b7c66876a33f8b9ecbfab9ed77b0231ff4ca9d6dd72a1707cf1b7f62ec31a843ed3f0f5a80
SSDEEP

49152:3vyI22SsaNYfdPBldt698dBcjH6cRJ6gbR3LoGdDTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjH6cRJ66

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:139

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/2312-1-0x00000000002D0000-0x00000000005F4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1916 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

3388 schtasks.exe
3724 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

anti vairus 2.exeClient.exe

description pid process

Token: SeDebugPrivilege 2312 anti vairus 2.exe
Token: SeDebugPrivilege 1916 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1916 Client.exe

pid	process
1916	Client.exe

pid	process
3388	schtasks.exe
3724	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2312	anti vairus 2.exe
Token: SeDebugPrivilege	1916	Client.exe

pid	process
1916	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

anti vairus 2.exeClient.exe

description	pid	process	target process
PID 2312 wrote to memory of 3388	2312	anti vairus 2.exe	schtasks.exe
PID 2312 wrote to memory of 3388	2312	anti vairus 2.exe	schtasks.exe
PID 2312 wrote to memory of 1916	2312	anti vairus 2.exe	Client.exe
PID 2312 wrote to memory of 1916	2312	anti vairus 2.exe	Client.exe
PID 1916 wrote to memory of 3724	1916	Client.exe	schtasks.exe
PID 1916 wrote to memory of 3724	1916	Client.exe	schtasks.exe

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\anti vairus 2.exe
"C:\Users\Admin\AppData\Local\Temp\anti vairus 2.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2312
- 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:3388
- 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:1916
- - 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:3724

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
8d55ff61779a99eb62783ca01e4636ac

SHA1
322d7aa8772513e89adb2322e95fb371365972e4

SHA256
3ea391b2d054781eee918dc893a9e2188d0bfa5b81e569ba782e45c7cdc0578c

SHA512
3be71c9277f0dee2861842c854bffa286f562853f5fa20e72833a9b7c66876a33f8b9ecbfab9ed77b0231ff4ca9d6dd72a1707cf1b7f62ec31a843ed3f0f5a80

Download Submit
memory/1916-6-0x00007FFA04EF0000-0x00007FFA059B2000-memory.dmp

Filesize
10.8MB

Download
memory/1916-7-0x00007FFA04EF0000-0x00007FFA059B2000-memory.dmp

Filesize
10.8MB

Download
memory/1916-8-0x000000001BC30000-0x000000001BC80000-memory.dmp

Filesize
320KB

Download
memory/1916-9-0x000000001D1A0000-0x000000001D252000-memory.dmp

Filesize
712KB

Download
memory/1916-10-0x00007FFA04EF0000-0x00007FFA059B2000-memory.dmp

Filesize
10.8MB

Download
memory/2312-0-0x00007FFA04EF3000-0x00007FFA04EF5000-memory.dmp

Filesize
8KB

Download
memory/2312-1-0x00000000002D0000-0x00000000005F4000-memory.dmp

Filesize
3.1MB

Download
memory/2312-2-0x00007FFA04EF0000-0x00007FFA059B2000-memory.dmp

Filesize
10.8MB

Download
memory/2312-5-0x00007FFA04EF0000-0x00007FFA059B2000-memory.dmp

Filesize
10.8MB

Download