quasar | 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
29-10-2024 17:36

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General

Target

Client-built.exe
Size

3.1MB
MD5

c65338d7d892863734f74ee949cb7a16
SHA1

50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256

14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512

c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0
SSDEEP

49152:Svht62XlaSFNWPjljiFa2RoUYIV34abRDKLoGOZTHHB72eh2NT:SvL62XlaSFNWPjljiFXRoUYIV34K0

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.28:4782

Mutex

03ef2b9a-5389-4312-b3d3-9b6f68cc5386

Attributes

encryption_key
F8A900CD75D848E74023B3A66FA8AA5469C97692
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
.
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
behavioral2/memory/2464-1-0x0000000000110000-0x0000000000434000-memory.dmp	family_quasar
behavioral2/files/0x0031000000023b5c-4.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3964	Client.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	Client-built.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	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
4652	schtasks.exe
2224	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2464	Client-built.exe
Token: SeDebugPrivilege	3964	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3964	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2464 wrote to memory of 4652	2464	Client-built.exe	87
PID 2464 wrote to memory of 4652	2464	Client-built.exe	87
PID 2464 wrote to memory of 3964	2464	Client-built.exe	89
PID 2464 wrote to memory of 3964	2464	Client-built.exe	89
PID 3964 wrote to memory of 2224	3964	Client.exe	90
PID 3964 wrote to memory of 2224	3964	Client.exe	90

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2464
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4652
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3964
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

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
c65338d7d892863734f74ee949cb7a16

SHA1
50151ab64046e04bc2e8d58c7c3bff0991299e9b

SHA256
14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645

SHA512
c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

Download Submit
memory/2464-0-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

Filesize
1.0MB

Download
memory/2464-1-0x0000000000110000-0x0000000000434000-memory.dmp

Filesize
3.1MB

Download
memory/2464-7-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

Filesize
1.0MB

Download
memory/3964-8-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

Filesize
1.0MB

Download
memory/3964-9-0x000000001BEC0000-0x000000001BF10000-memory.dmp

Filesize
320KB

Download
memory/3964-10-0x000000001C700000-0x000000001C7B2000-memory.dmp

Filesize
712KB

Download
memory/3964-11-0x00007FF9FA030000-0x00007FF9FA13B000-memory.dmp

Filesize
1.0MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads