quasar | e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe

Analysis

max time kernel
33s
max time network
36s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
29/12/2024, 21:03

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General

Target

Client-built.exe
Size

3.1MB
MD5

e34ce1e492d0a57ec3997512039793c9
SHA1

d3ec7bfd2d7f676adede7195db6c1a679d5c06a8
SHA256

e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe
SHA512

00cd5d896efaaba657f3d5e917d43ff4360bb3e5d2779abf8b468b8526fed8e5ae22285f6e42c2c9f2e6155cde3049e87a855a5405be2cfaf23561acad96a7fe
SSDEEP

49152:yvyI22SsaNYfdPBldt698dBcjHNzRJ6tbR3LoGdvTHHB72eh2NT:yvf22SsaNYfdPBldt6+dBcjHNzRJ6/

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.104:4782

Mutex

0b53b5f1-6e56-4e94-bd1e-c8d3128b0755

Attributes

encryption_key
06B92BA0BB279356BE72C22FE42BED732D4D3DF7
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
HD Audio Background Processor
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/4692-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b73-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
344	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
4216	schtasks.exe
3964	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4692	Client-built.exe
Token: SeDebugPrivilege	344	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
344	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4692 wrote to memory of 4216	4692	Client-built.exe	82
PID 4692 wrote to memory of 4216	4692	Client-built.exe	82
PID 4692 wrote to memory of 344	4692	Client-built.exe	84
PID 4692 wrote to memory of 344	4692	Client-built.exe	84
PID 344 wrote to memory of 3964	344	Client.exe	85
PID 344 wrote to memory of 3964	344	Client.exe	85

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4692
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "HD Audio Background Processor" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4216
- 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:344
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "HD Audio Background Processor" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3964

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1200

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
e34ce1e492d0a57ec3997512039793c9

SHA1
d3ec7bfd2d7f676adede7195db6c1a679d5c06a8

SHA256
e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe

SHA512
00cd5d896efaaba657f3d5e917d43ff4360bb3e5d2779abf8b468b8526fed8e5ae22285f6e42c2c9f2e6155cde3049e87a855a5405be2cfaf23561acad96a7fe

Download Submit
memory/344-9-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/344-11-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/344-12-0x0000000002770000-0x00000000027C0000-memory.dmp

Filesize
320KB

Download
memory/344-13-0x000000001BA30000-0x000000001BAE2000-memory.dmp

Filesize
712KB

Download
memory/344-14-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/344-15-0x000000001C220000-0x000000001C748000-memory.dmp

Filesize
5.2MB

Download
memory/4692-0-0x00007FFDBF313000-0x00007FFDBF315000-memory.dmp

Filesize
8KB

Download
memory/4692-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp

Filesize
3.1MB

Download
memory/4692-2-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/4692-10-0x00007FFDBF310000-0x00007FFDBFDD1000-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