quasar | 965b676b1f41d84e4db8100d4658eaaf99cebc90d2e2430bd48bcc7634d257d6

Analysis

max time kernel
63s
max time network
70s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
05-01-2025 20:10

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General

Target

AerisBoostrapper-13-2.exe
Size

3.1MB
MD5

e2a60937f0b261889509480a6aeccd28
SHA1

e7388a6fe6b26369bd049fcb9274676b8e799626
SHA256

d2c8622fb29e5e0b800926c2ace9dbfd35fe798bb81dd05f992016aafbbad059
SHA512

c517dcbe37fe6d55a763b7223b0f64073c46569b1afa8868ccf56ff1b0afce0c83eb3cce30bd0978a82a8cd60e0d5f7e4705890e304ba9f283f7023eb166fd36
SSDEEP

49152:xviI22SsaNYfdPBldt698dBcjH/HzhNmzLQoGdbTHHB72eh2NT:xvv22SsaNYfdPBldt6+dBcjHfzhR

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.7.254:4782

Mutex

ec379305-a810-4d7e-97bd-07901661d993

Attributes

encryption_key
4F7174D194172642AE5CB98C8155E3A959E610E5
install_name
MsMpEng.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Security
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/4472-1-0x0000000000380000-0x00000000006A4000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045109-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2960	MsMpEng.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\MsMpEng.exe	AerisBoostrapper-13-2.exe
File opened for modification	C:\Windows\system32\SubDir\MsMpEng.exe	AerisBoostrapper-13-2.exe
File opened for modification	C:\Windows\system32\SubDir	AerisBoostrapper-13-2.exe
File opened for modification	C:\Windows\system32\SubDir\MsMpEng.exe	MsMpEng.exe
File opened for modification	C:\Windows\system32\SubDir	MsMpEng.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
2380	schtasks.exe
396	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4472	AerisBoostrapper-13-2.exe
Token: SeDebugPrivilege	2960	MsMpEng.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2960	MsMpEng.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2960	MsMpEng.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2960	MsMpEng.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4472 wrote to memory of 2380	4472	AerisBoostrapper-13-2.exe	81
PID 4472 wrote to memory of 2380	4472	AerisBoostrapper-13-2.exe	81
PID 4472 wrote to memory of 2960	4472	AerisBoostrapper-13-2.exe	83
PID 4472 wrote to memory of 2960	4472	AerisBoostrapper-13-2.exe	83
PID 2960 wrote to memory of 396	2960	MsMpEng.exe	84
PID 2960 wrote to memory of 396	2960	MsMpEng.exe	84

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\AerisBoostrapper-13-2.exe
"C:\Users\Admin\AppData\Local\Temp\AerisBoostrapper-13-2.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4472
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Security" /sc ONLOGON /tr "C:\Windows\system32\SubDir\MsMpEng.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2380
- C:\Windows\system32\SubDir\MsMpEng.exe
  "C:\Windows\system32\SubDir\MsMpEng.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2960
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Security" /sc ONLOGON /tr "C:\Windows\system32\SubDir\MsMpEng.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:396

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:320

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:\Windows\System32\SubDir\MsMpEng.exe

Filesize
3.1MB

MD5
e2a60937f0b261889509480a6aeccd28

SHA1
e7388a6fe6b26369bd049fcb9274676b8e799626

SHA256
d2c8622fb29e5e0b800926c2ace9dbfd35fe798bb81dd05f992016aafbbad059

SHA512
c517dcbe37fe6d55a763b7223b0f64073c46569b1afa8868ccf56ff1b0afce0c83eb3cce30bd0978a82a8cd60e0d5f7e4705890e304ba9f283f7023eb166fd36

Download Submit
memory/2960-6-0x00007FFB58690000-0x00007FFB59152000-memory.dmp

Filesize
10.8MB

Download
memory/2960-7-0x00007FFB58690000-0x00007FFB59152000-memory.dmp

Filesize
10.8MB

Download
memory/2960-8-0x000000001B990000-0x000000001B9E0000-memory.dmp

Filesize
320KB

Download
memory/2960-9-0x000000001CB40000-0x000000001CBF2000-memory.dmp

Filesize
712KB

Download
memory/2960-10-0x00007FFB58690000-0x00007FFB59152000-memory.dmp

Filesize
10.8MB

Download
memory/4472-0-0x00007FFB58693000-0x00007FFB58695000-memory.dmp

Filesize
8KB

Download
memory/4472-1-0x0000000000380000-0x00000000006A4000-memory.dmp

Filesize
3.1MB

Download
memory/4472-2-0x00007FFB58690000-0x00007FFB59152000-memory.dmp

Filesize
10.8MB

Download
memory/4472-5-0x00007FFB58690000-0x00007FFB59152000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads