quasar | 8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1

Analysis

max time kernel
150s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
28-11-2024 09:15

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General

Target

Client-built.exe
Size

3.1MB
MD5

d1f13629773443d07acf921fbba38982
SHA1

3cbd73a94e55487e683cac99297fd98a0570f1ca
SHA256

8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1
SHA512

3f0378c2407a8630d9b2a92015b41e450af2e7ae5a99b5d204005312f7d97a193e4c8a2796adb5a281f14a935893158820552952fe3c8e489a1de438fcd0f747
SSDEEP

49152:fvqlL26AaNeWgPhlmVqvMQ7XSKfdRJ68bR3LoGdTKTHHB72eh2NT:fvSL26AaNeWgPhlmVqkQ7XSKfdRJ6G

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.39:4782

Mutex

3b241461-adb5-459a-81b3-0e7413c3b174

Attributes

encryption_key
7928B7E8CF671D0E7D6DF9547E85C7460DB50B8D
install_name
fortnite1.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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/4844-1-0x00000000004B0000-0x00000000007D4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c93-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4532	fortnite1.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

T1053.005

pid	Process
4376	schtasks.exe
2444	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4844	Client-built.exe
Token: SeDebugPrivilege	4532	fortnite1.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4532	fortnite1.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4532	fortnite1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4532	fortnite1.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4844 wrote to memory of 2444	4844	Client-built.exe	82
PID 4844 wrote to memory of 2444	4844	Client-built.exe	82
PID 4844 wrote to memory of 4532	4844	Client-built.exe	84
PID 4844 wrote to memory of 4532	4844	Client-built.exe	84
PID 4532 wrote to memory of 4376	4532	fortnite1.exe	85
PID 4532 wrote to memory of 4376	4532	fortnite1.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:4844
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2444
- C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4532
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4376

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe

Filesize
3.1MB

MD5
d1f13629773443d07acf921fbba38982

SHA1
3cbd73a94e55487e683cac99297fd98a0570f1ca

SHA256
8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1

SHA512
3f0378c2407a8630d9b2a92015b41e450af2e7ae5a99b5d204005312f7d97a193e4c8a2796adb5a281f14a935893158820552952fe3c8e489a1de438fcd0f747

Download Submit
memory/4532-10-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/4532-11-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/4532-12-0x000000001DE90000-0x000000001DEE0000-memory.dmp

Filesize
320KB

Download
memory/4532-13-0x000000001DFA0000-0x000000001E052000-memory.dmp

Filesize
712KB

Download
memory/4532-14-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/4844-0-0x00007FF9DB8B3000-0x00007FF9DB8B5000-memory.dmp

Filesize
8KB

Download
memory/4844-1-0x00000000004B0000-0x00000000007D4000-memory.dmp

Filesize
3.1MB

Download
memory/4844-2-0x00007FF9DB8B0000-0x00007FF9DC371000-memory.dmp

Filesize
10.8MB

Download
memory/4844-9-0x00007FF9DB8B0000-0x00007FF9DC371000-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