quasar | cd86c5503176eec0bc6209d504366ffdbe9d18167460aa2784a2f720e8c5bd6d

Analysis

max time kernel
147s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
04-02-2025 04:04

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General

Target

Client-built.exe
Size

3.1MB
MD5

c9c5e0626761e6dfdbe01941e8f8b332
SHA1

6222bf847ba1b324bc291867abcf3fe2d3d76400
SHA256

cd86c5503176eec0bc6209d504366ffdbe9d18167460aa2784a2f720e8c5bd6d
SHA512

2328286dd003d413f38c2f6d8afc3933cfbf18774d1b26b7d40fe97537c7cd34d76e3b43492f5d0628464877beb78e524cee3941f9312e23356fdd5e7192bc2c
SSDEEP

49152:Dvkt62XlaSFNWPjljiFa2RoUYIsCmwLoRdJFTHHB72eh2NT:Dv462XlaSFNWPjljiFXRoUYIsCmO

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4800

Mutex

366cc5a6-9875-43f5-b406-b422373aa69b

Attributes

encryption_key
13765B0E8E4F6CB0053DA8B5123C9FA10F47987B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
bob
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/3708-1-0x0000000000C80000-0x0000000000FA4000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002aabb-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5076	Client.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
3484	schtasks.exe
2560	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3708	Client-built.exe
Token: SeDebugPrivilege	5076	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5076	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3708 wrote to memory of 2560	3708	Client-built.exe	77
PID 3708 wrote to memory of 2560	3708	Client-built.exe	77
PID 3708 wrote to memory of 5076	3708	Client-built.exe	79
PID 3708 wrote to memory of 5076	3708	Client-built.exe	79
PID 5076 wrote to memory of 3484	5076	Client.exe	80
PID 5076 wrote to memory of 3484	5076	Client.exe	80

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:3708
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2560
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5076
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3484

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\Client.exe

Filesize
3.1MB

MD5
c9c5e0626761e6dfdbe01941e8f8b332

SHA1
6222bf847ba1b324bc291867abcf3fe2d3d76400

SHA256
cd86c5503176eec0bc6209d504366ffdbe9d18167460aa2784a2f720e8c5bd6d

SHA512
2328286dd003d413f38c2f6d8afc3933cfbf18774d1b26b7d40fe97537c7cd34d76e3b43492f5d0628464877beb78e524cee3941f9312e23356fdd5e7192bc2c

Download Submit
memory/3708-0-0x00007FFF856F3000-0x00007FFF856F5000-memory.dmp

Filesize
8KB

Download
memory/3708-1-0x0000000000C80000-0x0000000000FA4000-memory.dmp

Filesize
3.1MB

Download
memory/3708-2-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

Filesize
10.8MB

Download
memory/3708-9-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

Filesize
10.8MB

Download
memory/5076-10-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

Filesize
10.8MB

Download
memory/5076-11-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

Filesize
10.8MB

Download
memory/5076-12-0x000000001BD10000-0x000000001BD60000-memory.dmp

Filesize
320KB

Download
memory/5076-13-0x000000001C520000-0x000000001C5D2000-memory.dmp

Filesize
712KB

Download
memory/5076-14-0x00007FFF856F0000-0x00007FFF861B2000-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