quasar | f6cb09e109a5cbcd9286b293464ee0fa8ca4a846ccc59b0dfa53c114d74b1093

Analysis

max time kernel
146s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
19-05-2024 16:44

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

setup.exe
Size

3.1MB
MD5

85f1c33bca15aed885f2a211c7a16ace
SHA1

4ca79b4c8e8d6a3e7023d94f98c8c4d53e363934
SHA256

f6cb09e109a5cbcd9286b293464ee0fa8ca4a846ccc59b0dfa53c114d74b1093
SHA512

c319cc1cbd39bc1508288f357c4f7fd9fa907fa5d4377f6b7b9e37e3a76e91fcbf62d989b27019a47c95ee51895a794fb5eb5c6c19a639e2636d4eb8f22f6651
SSDEEP

49152:WvyI22SsaNYfdPBldt698dBcjHRmDkE2HNk/+FVoGdvVTHHB72eh2NT:Wvf22SsaNYfdPBldt6+dBcjHRmD2X

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

86.9.95.137:4782

Mutex

d09b8b98-ea9c-49d4-bfd3-04dda7a80cde

Attributes

encryption_key
F26B2A96E9FB88BAB8A8E7F9F9A1630733DE7809
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
windows defender
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4516-1-0x0000000000030000-0x0000000000354000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

3148 Client.exe
Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

3996 schtasks.exe
248 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

setup.exeClient.exe

description pid process

Token: SeDebugPrivilege 4516 setup.exe
Token: SeDebugPrivilege 3148 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

3148 Client.exe

pid	process
3148	Client.exe

pid	process
3996	schtasks.exe
248	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4516	setup.exe
Token: SeDebugPrivilege	3148	Client.exe

pid	process
3148	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

setup.exeClient.exe

description	pid	process	target process
PID 4516 wrote to memory of 3996	4516	setup.exe	schtasks.exe
PID 4516 wrote to memory of 3996	4516	setup.exe	schtasks.exe
PID 4516 wrote to memory of 3148	4516	setup.exe	Client.exe
PID 4516 wrote to memory of 3148	4516	setup.exe	Client.exe
PID 3148 wrote to memory of 248	3148	Client.exe	schtasks.exe
PID 3148 wrote to memory of 248	3148	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\setup.exe
"C:\Users\Admin\AppData\Local\Temp\setup.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4516

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "windows defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3996

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:3148

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "windows defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:248

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2880

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
85f1c33bca15aed885f2a211c7a16ace

SHA1
4ca79b4c8e8d6a3e7023d94f98c8c4d53e363934

SHA256
f6cb09e109a5cbcd9286b293464ee0fa8ca4a846ccc59b0dfa53c114d74b1093

SHA512
c319cc1cbd39bc1508288f357c4f7fd9fa907fa5d4377f6b7b9e37e3a76e91fcbf62d989b27019a47c95ee51895a794fb5eb5c6c19a639e2636d4eb8f22f6651

Download Submit
memory/3148-10-0x00007FF991AE0000-0x00007FF9925A2000-memory.dmp

Filesize
10.8MB

Download
memory/3148-11-0x00007FF991AE0000-0x00007FF9925A2000-memory.dmp

Filesize
10.8MB

Download
memory/3148-12-0x000000001BB90000-0x000000001BBE0000-memory.dmp

Filesize
320KB

Download
memory/3148-13-0x000000001BCA0000-0x000000001BD52000-memory.dmp

Filesize
712KB

Download
memory/3148-14-0x00007FF991AE0000-0x00007FF9925A2000-memory.dmp

Filesize
10.8MB

Download
memory/4516-0-0x00007FF991AE3000-0x00007FF991AE5000-memory.dmp

Filesize
8KB

Download
memory/4516-1-0x0000000000030000-0x0000000000354000-memory.dmp

Filesize
3.1MB

Download
memory/4516-2-0x00007FF991AE0000-0x00007FF9925A2000-memory.dmp

Filesize
10.8MB

Download
memory/4516-9-0x00007FF991AE0000-0x00007FF9925A2000-memory.dmp

Filesize
10.8MB

Download