quasar | 9c881a05c58c18e795f9f687804c8a4f13244744bbcd0b1bd07856cbd42a378d

Analysis

max time kernel
126s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19/01/2025, 04:26

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General

Target

Client-built.exe
Size

3.1MB
MD5

e84825f20d531199cefcdf8f0ac0a5bf
SHA1

e016a14c992c56ef916da2465211ebbfee8502c1
SHA256

9c881a05c58c18e795f9f687804c8a4f13244744bbcd0b1bd07856cbd42a378d
SHA512

d9b719ec9853d8c9aaeb8e597082cb69c9a338d4f5dd3685e49841dc93f03e63f67e4f21ec59fa10b561c412cbde124d589f7b1cff1525002f3b78eaf4995fab
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjHEYhBbRjPLoGdzkTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHEYh7Tj

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.2.19:4782

Mutex

112650ca-1287-418e-b9d3-1664d22cb8f1

Attributes

encryption_key
CA3612A22558F9AC4A3F0665F4EF083FB1D45393
install_name
Client.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/4336-1-0x0000000000250000-0x0000000000574000-memory.dmp	family_quasar
behavioral2/files/0x0009000000023c9d-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4416	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
4208	schtasks.exe
1676	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4336	Client-built.exe
Token: SeDebugPrivilege	4416	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4416	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4336 wrote to memory of 4208	4336	Client-built.exe	83
PID 4336 wrote to memory of 4208	4336	Client-built.exe	83
PID 4336 wrote to memory of 4416	4336	Client-built.exe	85
PID 4336 wrote to memory of 4416	4336	Client-built.exe	85
PID 4416 wrote to memory of 1676	4416	Client.exe	86
PID 4416 wrote to memory of 1676	4416	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:4336
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4208
- 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:4416
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1676

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
e84825f20d531199cefcdf8f0ac0a5bf

SHA1
e016a14c992c56ef916da2465211ebbfee8502c1

SHA256
9c881a05c58c18e795f9f687804c8a4f13244744bbcd0b1bd07856cbd42a378d

SHA512
d9b719ec9853d8c9aaeb8e597082cb69c9a338d4f5dd3685e49841dc93f03e63f67e4f21ec59fa10b561c412cbde124d589f7b1cff1525002f3b78eaf4995fab

Download Submit
memory/4336-0-0x00007FFE76443000-0x00007FFE76445000-memory.dmp

Filesize
8KB

Download
memory/4336-1-0x0000000000250000-0x0000000000574000-memory.dmp

Filesize
3.1MB

Download
memory/4336-2-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4336-10-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4416-9-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4416-11-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4416-12-0x000000001B640000-0x000000001B690000-memory.dmp

Filesize
320KB

Download
memory/4416-13-0x000000001BE50000-0x000000001BF02000-memory.dmp

Filesize
712KB

Download
memory/4416-14-0x00007FFE76440000-0x00007FFE76F01000-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