quasar | 411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
26/01/2025, 21:41

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General

Target

Client-built.exe
Size

3.1MB
MD5

bcfb625c8bdc9d6f55e16fc7c363292f
SHA1

a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d
SHA256

411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb
SHA512

b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa
SSDEEP

49152:SviI22SsaNYfdPBldt698dBcjHBCj1JOLoGd+bTHHB72eh2NT:Svv22SsaNYfdPBldt6+dBcjHBCs

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.178.152:4782

Mutex

bacc9e85-2eef-4433-8941-a9c611b9e303

Attributes

encryption_key
D40083F8A2F2D1B1C3C76364F5615E487354F5D3
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows 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/2968-1-0x0000000000770000-0x0000000000A94000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023ba0-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4616	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

T1053.005

pid	Process
2812	schtasks.exe
1248	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2968	Client-built.exe
Token: SeDebugPrivilege	4616	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4616	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4616	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4616	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 2812	2968	Client-built.exe	82
PID 2968 wrote to memory of 2812	2968	Client-built.exe	82
PID 2968 wrote to memory of 4616	2968	Client-built.exe	84
PID 2968 wrote to memory of 4616	2968	Client-built.exe	84
PID 4616 wrote to memory of 1248	4616	Client.exe	86
PID 4616 wrote to memory of 1248	4616	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2968
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2812
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4616
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1248

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\Client.exe

Filesize
3.1MB

MD5
bcfb625c8bdc9d6f55e16fc7c363292f

SHA1
a5da3ba7826fcbe4b1e53d1a8faab851d65b9e5d

SHA256
411404c25495ed9c16504a74d9697965f240e11932dcbc987598453f00502efb

SHA512
b39bc965b5b0eb7207d31276e9d04830c9af4201613a9854595e3c78d3c0e13b7e5af3ae14a22b08b24b6063eaf8856db7a986546901941be301cc03707944fa

Download Submit
memory/2968-0-0x00007FFDFA733000-0x00007FFDFA735000-memory.dmp

Filesize
8KB

Download
memory/2968-1-0x0000000000770000-0x0000000000A94000-memory.dmp

Filesize
3.1MB

Download
memory/2968-2-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/2968-9-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/4616-10-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/4616-11-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/4616-12-0x000000001E210000-0x000000001E260000-memory.dmp

Filesize
320KB

Download
memory/4616-13-0x000000001E320000-0x000000001E3D2000-memory.dmp

Filesize
712KB

Download
memory/4616-14-0x00007FFDFA730000-0x00007FFDFB1F1000-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