quasar | 5f2520633846371a2777aeba2c39b8b22ba5f572d091dc9ad3aaa6a9da4c56c4

Analysis

max time kernel
138s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
28/01/2025, 19:01

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General

Target

Client-built.exe
Size

3.1MB
MD5

3436704fcaa032675bc4b8f1768f8ce2
SHA1

f7c0bcd46e674c467402fc0b9019b0e25e7ca547
SHA256

5f2520633846371a2777aeba2c39b8b22ba5f572d091dc9ad3aaa6a9da4c56c4
SHA512

4476ff2394193be61a2287cb8a3c20597a88b8028361c4b216b24a121a99939f9a5a3b0a2d77cf4f1fb3c6c9977de8e1f0b930e30f6abf6ccf75d3e3de71d366
SSDEEP

49152:DvXI22SsaNYfdPBldt698dBcjHou501vHLoDdftTHHB72eh2NT:DvY22SsaNYfdPBldt6+dBcjHou5K

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.24:4782

Mutex

8778106a-0eb2-4d35-9617-d68276872dc3

Attributes

encryption_key
6705C9378B815AFF21AE90A8CD796479C7CB6028
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Shell Experience
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/1608-1-0x00000000004D0000-0x00000000007F4000-memory.dmp	family_quasar
behavioral1/files/0x000a000000023b75-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2844	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
1560	schtasks.exe
4464	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1608	Client-built.exe
Token: SeDebugPrivilege	2844	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2844	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 1560	1608	Client-built.exe	83
PID 1608 wrote to memory of 1560	1608	Client-built.exe	83
PID 1608 wrote to memory of 2844	1608	Client-built.exe	85
PID 1608 wrote to memory of 2844	1608	Client-built.exe	85
PID 2844 wrote to memory of 4464	2844	Client.exe	86
PID 2844 wrote to memory of 4464	2844	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:1608
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Shell Experience" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1560
- 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:2844
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Shell Experience" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4464

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
3436704fcaa032675bc4b8f1768f8ce2

SHA1
f7c0bcd46e674c467402fc0b9019b0e25e7ca547

SHA256
5f2520633846371a2777aeba2c39b8b22ba5f572d091dc9ad3aaa6a9da4c56c4

SHA512
4476ff2394193be61a2287cb8a3c20597a88b8028361c4b216b24a121a99939f9a5a3b0a2d77cf4f1fb3c6c9977de8e1f0b930e30f6abf6ccf75d3e3de71d366

Download Submit
memory/1608-0-0x00007FFC30343000-0x00007FFC30345000-memory.dmp

Filesize
8KB

Download
memory/1608-1-0x00000000004D0000-0x00000000007F4000-memory.dmp

Filesize
3.1MB

Download
memory/1608-2-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/1608-9-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/2844-10-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/2844-11-0x00007FFC30340000-0x00007FFC30E01000-memory.dmp

Filesize
10.8MB

Download
memory/2844-12-0x000000001B110000-0x000000001B160000-memory.dmp

Filesize
320KB

Download
memory/2844-13-0x000000001B960000-0x000000001BA12000-memory.dmp

Filesize
712KB

Download
memory/2844-14-0x00007FFC30340000-0x00007FFC30E01000-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