quasar | be1b627aae89a5d60e46c67a611721d3d2aa156f4981516e1397eacb49715830

Analysis

max time kernel
37s
max time network
43s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
24-12-2024 18:46

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General

Target

AugustusInstaller.exe
Size

3.1MB
MD5

d0d6aa544dd91fa40db301efa7528019
SHA1

c02eb4a05fcd515bfb247dccc765c0e4b9ddfffa
SHA256

d27d4eb04172e979d6660f5f3ef9b9caced7a535c423571ad6685d76445a7d8d
SHA512

bc8961509e54ad4f3f96d224b1f44fb415358a9ebfada09b995860799cbb169fe39bcf6520cf3e9e30b63915633692c21e5dbc5af569da59f7e2d80fd36df532
SSDEEP

49152:mvaY52fyaSZOrPWluWBuGG5g5hCnc+p7RvkCqLoMdITHHB72eh2NT:mvv52fyaSZOrPWluWBDG5g5hCncX

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.2.15:4782

Mutex

467b644d-3aa7-4652-9849-85b82e772b7e

Attributes

encryption_key
D65D0AFFBB620AD32D40AB4922CBBC09E85999E8
install_name
Augustus.exe
log_directory
Logs
reconnect_delay
3000
startup_key
System
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/3996-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp	family_quasar
behavioral1/files/0x001900000002ab19-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4064	Augustus.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
876	schtasks.exe
4984	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3996	AugustusInstaller.exe
Token: SeDebugPrivilege	4064	Augustus.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4064	Augustus.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3996 wrote to memory of 876	3996	AugustusInstaller.exe	79
PID 3996 wrote to memory of 876	3996	AugustusInstaller.exe	79
PID 3996 wrote to memory of 4064	3996	AugustusInstaller.exe	81
PID 3996 wrote to memory of 4064	3996	AugustusInstaller.exe	81
PID 4064 wrote to memory of 4984	4064	Augustus.exe	82
PID 4064 wrote to memory of 4984	4064	Augustus.exe	82

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\AugustusInstaller.exe
"C:\Users\Admin\AppData\Local\Temp\AugustusInstaller.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3996
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Augustus.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:876
- C:\Users\Admin\AppData\Roaming\SubDir\Augustus.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Augustus.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4064
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "System" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Augustus.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4984

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4040

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\Augustus.exe

Filesize
3.1MB

MD5
d0d6aa544dd91fa40db301efa7528019

SHA1
c02eb4a05fcd515bfb247dccc765c0e4b9ddfffa

SHA256
d27d4eb04172e979d6660f5f3ef9b9caced7a535c423571ad6685d76445a7d8d

SHA512
bc8961509e54ad4f3f96d224b1f44fb415358a9ebfada09b995860799cbb169fe39bcf6520cf3e9e30b63915633692c21e5dbc5af569da59f7e2d80fd36df532

Download Submit
memory/3996-0-0x00007FFE8EB83000-0x00007FFE8EB85000-memory.dmp

Filesize
8KB

Download
memory/3996-1-0x0000000000B80000-0x0000000000EA4000-memory.dmp

Filesize
3.1MB

Download
memory/3996-2-0x00007FFE8EB80000-0x00007FFE8F642000-memory.dmp

Filesize
10.8MB

Download
memory/3996-9-0x00007FFE8EB80000-0x00007FFE8F642000-memory.dmp

Filesize
10.8MB

Download
memory/4064-10-0x00007FFE8EB80000-0x00007FFE8F642000-memory.dmp

Filesize
10.8MB

Download
memory/4064-11-0x00007FFE8EB80000-0x00007FFE8F642000-memory.dmp

Filesize
10.8MB

Download
memory/4064-12-0x000000001C510000-0x000000001C560000-memory.dmp

Filesize
320KB

Download
memory/4064-13-0x000000001C620000-0x000000001C6D2000-memory.dmp

Filesize
712KB

Download
memory/4064-14-0x00007FFE8EB80000-0x00007FFE8F642000-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