quasar | 83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730

Analysis

max time kernel
126s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17-12-2024 18:50

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General

Target

83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.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/4816-1-0x00000000001C0000-0x00000000004E4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b5b-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1028	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
4564	schtasks.exe
2556	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4816	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe
Token: SeDebugPrivilege	1028	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1028	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4816 wrote to memory of 2556	4816	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	82
PID 4816 wrote to memory of 2556	4816	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	82
PID 4816 wrote to memory of 1028	4816	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	84
PID 4816 wrote to memory of 1028	4816	83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe	84
PID 1028 wrote to memory of 4564	1028	Client.exe	85
PID 1028 wrote to memory of 4564	1028	Client.exe	85

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\83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe
"C:\Users\Admin\AppData\Local\Temp\83fa36e3a01bf4ab3fc03e0a08782273e38e6a724cb1152179696494b44ab730.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4816
- 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:2556
- 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:1028
- - 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:4564

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/1028-10-0x00007FFF6B500000-0x00007FFF6BFC1000-memory.dmp

Filesize
10.8MB

Download
memory/1028-11-0x00007FFF6B500000-0x00007FFF6BFC1000-memory.dmp

Filesize
10.8MB

Download
memory/1028-12-0x000000001D880000-0x000000001D8D0000-memory.dmp

Filesize
320KB

Download
memory/1028-13-0x000000001D990000-0x000000001DA42000-memory.dmp

Filesize
712KB

Download
memory/1028-14-0x00007FFF6B500000-0x00007FFF6BFC1000-memory.dmp

Filesize
10.8MB

Download
memory/4816-0-0x00007FFF6B503000-0x00007FFF6B505000-memory.dmp

Filesize
8KB

Download
memory/4816-1-0x00000000001C0000-0x00000000004E4000-memory.dmp

Filesize
3.1MB

Download
memory/4816-2-0x00007FFF6B500000-0x00007FFF6BFC1000-memory.dmp

Filesize
10.8MB

Download
memory/4816-9-0x00007FFF6B500000-0x00007FFF6BFC1000-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