quasar | fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12

Analysis

max time kernel
126s
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
20-11-2024 15:23

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General

Target

Client.exe
Size

3.1MB
MD5

d1675434eee067b0a023a3c31cf7ba75
SHA1

baf38fe44bfea1a3f4ef5c387b71d2e08e7edc29
SHA256

fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12
SHA512

2316bc1b93a8b816963c5199f2fecaabaaef355bd8047af3c3b432250ae92e3010db45887a57176d1a639849f70c9c16fdec5b28c3f9ab9a166456fb003657ec
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH7CD2a95fQ7k/PLoGdNTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjHe6aD

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.83:4782

Mutex

20eb3b08-32c9-45df-9d5a-fb58af454c08

Attributes

encryption_key
22C1A62E3E9EE906C0C8F9D30DA34D63B8A197BA
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

Processes:

resource	yara_rule
behavioral2/memory/1864-1-0x0000000000510000-0x0000000000834000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb1-8.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
348	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

Processes:

schtasks.exeschtasks.exe

pid	Process
2580	schtasks.exe
880	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	1864	Client.exe
Token: SeDebugPrivilege	348	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
348	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client.exeClient.exe

description	pid	Process	procid_target
PID 1864 wrote to memory of 2580	1864	Client.exe	83
PID 1864 wrote to memory of 2580	1864	Client.exe	83
PID 1864 wrote to memory of 348	1864	Client.exe	85
PID 1864 wrote to memory of 348	1864	Client.exe	85
PID 348 wrote to memory of 880	348	Client.exe	86
PID 348 wrote to memory of 880	348	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.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1864
- 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:2580
- 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:348
- - 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:880

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
d1675434eee067b0a023a3c31cf7ba75

SHA1
baf38fe44bfea1a3f4ef5c387b71d2e08e7edc29

SHA256
fd5b712e067c1089aed9df7588844adef501a2c9742107a564a408965fb87c12

SHA512
2316bc1b93a8b816963c5199f2fecaabaaef355bd8047af3c3b432250ae92e3010db45887a57176d1a639849f70c9c16fdec5b28c3f9ab9a166456fb003657ec

Download Submit
memory/348-11-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

Filesize
10.8MB

Download
memory/348-12-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

Filesize
10.8MB

Download
memory/348-13-0x000000001B740000-0x000000001B790000-memory.dmp

Filesize
320KB

Download
memory/348-14-0x000000001C0E0000-0x000000001C192000-memory.dmp

Filesize
712KB

Download
memory/348-15-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

Filesize
10.8MB

Download
memory/1864-0-0x00007FFF759D3000-0x00007FFF759D5000-memory.dmp

Filesize
8KB

Download
memory/1864-1-0x0000000000510000-0x0000000000834000-memory.dmp

Filesize
3.1MB

Download
memory/1864-2-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

Filesize
10.8MB

Download
memory/1864-10-0x00007FFF759D0000-0x00007FFF76491000-memory.dmp

Filesize
10.8MB

Download