quasar | 83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730

Analysis

max time kernel
142s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-12-2024 06:31

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General

Target

installer.exe
Size

3.1MB
MD5

d228d9c94c9e9b9e94bcaab2f8711fa8
SHA1

6b4800ef23217ff864ad59ee401c63535a35766a
SHA256

83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730
SHA512

6c74e6dae4f6bcc7604f13f5a7a694b719481c4e82b42092ccc99747f45975789f0b671a1425fa1156dc3ba14d26d21f0e00d3be939c9601c2a3b1e2d27131a4
SSDEEP

49152:Svkt62XlaSFNWPjljiFa2RoUYI8jY+1J/woGdGAFTHHB72eh2NT:Sv462XlaSFNWPjljiFXRoUYI8jYF

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.43.241:4782

Mutex

0517af80-95f0-4a6d-a904-5b7ee8faa157

Attributes

encryption_key
6095BF6D5D58D02597F98370DFD1CCEB782F1EDD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svhost
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/2808-1-0x0000000000F00000-0x0000000001224000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b7b-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1392	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
5108	schtasks.exe
3236	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2808	installer.exe
Token: SeDebugPrivilege	1392	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1392	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2808 wrote to memory of 5108	2808	installer.exe	85
PID 2808 wrote to memory of 5108	2808	installer.exe	85
PID 2808 wrote to memory of 1392	2808	installer.exe	87
PID 2808 wrote to memory of 1392	2808	installer.exe	87
PID 1392 wrote to memory of 3236	1392	Client.exe	88
PID 1392 wrote to memory of 3236	1392	Client.exe	88

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\installer.exe
"C:\Users\Admin\AppData\Local\Temp\installer.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2808
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5108
- 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:1392
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "svhost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3236

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
d228d9c94c9e9b9e94bcaab2f8711fa8

SHA1
6b4800ef23217ff864ad59ee401c63535a35766a

SHA256
83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730

SHA512
6c74e6dae4f6bcc7604f13f5a7a694b719481c4e82b42092ccc99747f45975789f0b671a1425fa1156dc3ba14d26d21f0e00d3be939c9601c2a3b1e2d27131a4

Download Submit
memory/1392-9-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/1392-11-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/1392-12-0x000000001BA40000-0x000000001BA90000-memory.dmp

Filesize
320KB

Download
memory/1392-13-0x000000001BB50000-0x000000001BC02000-memory.dmp

Filesize
712KB

Download
memory/1392-14-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/2808-0-0x00007FFB67ED3000-0x00007FFB67ED5000-memory.dmp

Filesize
8KB

Download
memory/2808-1-0x0000000000F00000-0x0000000001224000-memory.dmp

Filesize
3.1MB

Download
memory/2808-2-0x00007FFB67ED0000-0x00007FFB68991000-memory.dmp

Filesize
10.8MB

Download
memory/2808-10-0x00007FFB67ED0000-0x00007FFB68991000-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