quasar | ec46dd64a026223ff115efdc51fd486069607041025e89d51f25d112cf33b77e | Triage

Analysis

max time kernel
126s
max time network
146s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
30-12-2024 02:43

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General

Target

rbxfpsunlocker.exe
Size

3.1MB
MD5

09a5b059ce629f09d69e340065aeb553
SHA1

6b6bff18c4452a25107210a6b59f298229e4ac95
SHA256

ec46dd64a026223ff115efdc51fd486069607041025e89d51f25d112cf33b77e
SHA512

ce94308bf44567e776e54606308089ddc3505c2cd1a8481d37ad128c6edfa1c2a9df418cb7865329ac1901e4c524d8c01042bd1471672a18721f2a9a25dab0bb
SSDEEP

49152:Cvdt62XlaSFNWPjljiFa2RoUYIJeRJ6gbR3LoGdOTHHB72eh2NT:Cvf62XlaSFNWPjljiFXRoUYIJeRJ66

Score

10^/10

quasar beamed spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

beamed

C2

192.168.203.82:4782

Mutex

3dad94cd-63f6-460a-a986-b1841d5dfefe

Attributes

encryption_key
DE46F816EBC96DE37F9233DDE7709263C7680426
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
JavaUpdate
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
behavioral3/memory/2420-1-0x0000000000810000-0x0000000000B34000-memory.dmp	family_quasar
behavioral3/files/0x0029000000045038-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3552	Client.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	rbxfpsunlocker.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	rbxfpsunlocker.exe
File opened for modification	C:\Program Files\SubDir	rbxfpsunlocker.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client.exe
File opened for modification	C:\Program Files\SubDir	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

pid	Process
4508	schtasks.exe
3180	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	rbxfpsunlocker.exe
Token: SeDebugPrivilege	3552	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3552	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3552	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3552	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 4508	2420	rbxfpsunlocker.exe	83
PID 2420 wrote to memory of 4508	2420	rbxfpsunlocker.exe	83
PID 2420 wrote to memory of 3552	2420	rbxfpsunlocker.exe	85
PID 2420 wrote to memory of 3552	2420	rbxfpsunlocker.exe	85
PID 3552 wrote to memory of 3180	3552	Client.exe	86
PID 3552 wrote to memory of 3180	3552	Client.exe	86

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\rbxfpsunlocker.exe
"C:\Users\Admin\AppData\Local\Temp\rbxfpsunlocker.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "JavaUpdate" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4508
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3552
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "JavaUpdate" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3180

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
09a5b059ce629f09d69e340065aeb553

SHA1
6b6bff18c4452a25107210a6b59f298229e4ac95

SHA256
ec46dd64a026223ff115efdc51fd486069607041025e89d51f25d112cf33b77e

SHA512
ce94308bf44567e776e54606308089ddc3505c2cd1a8481d37ad128c6edfa1c2a9df418cb7865329ac1901e4c524d8c01042bd1471672a18721f2a9a25dab0bb

Download Submit
memory/2420-0-0x00007FFE2E143000-0x00007FFE2E145000-memory.dmp

Filesize
8KB

Download
memory/2420-1-0x0000000000810000-0x0000000000B34000-memory.dmp

Filesize
3.1MB

Download
memory/2420-2-0x00007FFE2E140000-0x00007FFE2EC02000-memory.dmp

Filesize
10.8MB

Download
memory/2420-6-0x00007FFE2E140000-0x00007FFE2EC02000-memory.dmp

Filesize
10.8MB

Download
memory/3552-5-0x00007FFE2E140000-0x00007FFE2EC02000-memory.dmp

Filesize
10.8MB

Download
memory/3552-7-0x00007FFE2E140000-0x00007FFE2EC02000-memory.dmp

Filesize
10.8MB

Download
memory/3552-8-0x000000001C660000-0x000000001C6B0000-memory.dmp

Filesize
320KB

Download
memory/3552-9-0x000000001C770000-0x000000001C822000-memory.dmp

Filesize
712KB

Download
memory/3552-10-0x00007FFE2E140000-0x00007FFE2EC02000-memory.dmp

Filesize
10.8MB

Download