quasar | d1dcbaace029e8ab3ce6ff82a222b73ef9426673d9a4e6303766b089dd3e06cc

Analysis

max time kernel
30s
max time network
31s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
09-11-2024 05:44

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General

Target

Client-built.exe
Size

3.1MB
MD5

e0742646167fd5a72790af5346099276
SHA1

b2613a39cf361377cfcc21ac469fbb4b6d5970e9
SHA256

d1dcbaace029e8ab3ce6ff82a222b73ef9426673d9a4e6303766b089dd3e06cc
SHA512

88d1db33993b3b249e105b1c72e3c7e210c188f9ed045fbce508fa8845a7ed919f74244fa8ffd3dd88e43d839d62eb9b17a756d35397b64c7d4ab88c5785aaf9
SSDEEP

49152:KvyI22SsaNYfdPBldt698dBcjHFg/ABx4LoGdNHTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHe/xd

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.9:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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
behavioral1/memory/2968-1-0x0000000000970000-0x0000000000C94000-memory.dmp	family_quasar
behavioral1/files/0x00290000000450b6-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4824	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
1808	schtasks.exe
2360	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2968	Client-built.exe
Token: SeDebugPrivilege	4824	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4824	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2968 wrote to memory of 1808	2968	Client-built.exe	82
PID 2968 wrote to memory of 1808	2968	Client-built.exe	82
PID 2968 wrote to memory of 4824	2968	Client-built.exe	84
PID 2968 wrote to memory of 4824	2968	Client-built.exe	84
PID 4824 wrote to memory of 2360	4824	Client.exe	87
PID 4824 wrote to memory of 2360	4824	Client.exe	87

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:2968
- 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:1808
- 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:4824
- - 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:2360

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
e0742646167fd5a72790af5346099276

SHA1
b2613a39cf361377cfcc21ac469fbb4b6d5970e9

SHA256
d1dcbaace029e8ab3ce6ff82a222b73ef9426673d9a4e6303766b089dd3e06cc

SHA512
88d1db33993b3b249e105b1c72e3c7e210c188f9ed045fbce508fa8845a7ed919f74244fa8ffd3dd88e43d839d62eb9b17a756d35397b64c7d4ab88c5785aaf9

Download Submit
memory/2968-0-0x00007FFC4DD13000-0x00007FFC4DD15000-memory.dmp

Filesize
8KB

Download
memory/2968-1-0x0000000000970000-0x0000000000C94000-memory.dmp

Filesize
3.1MB

Download
memory/2968-2-0x00007FFC4DD10000-0x00007FFC4E7D2000-memory.dmp

Filesize
10.8MB

Download
memory/2968-5-0x00007FFC4DD10000-0x00007FFC4E7D2000-memory.dmp

Filesize
10.8MB

Download
memory/4824-6-0x00007FFC4DD10000-0x00007FFC4E7D2000-memory.dmp

Filesize
10.8MB

Download
memory/4824-7-0x00007FFC4DD10000-0x00007FFC4E7D2000-memory.dmp

Filesize
10.8MB

Download
memory/4824-8-0x000000001B520000-0x000000001B570000-memory.dmp

Filesize
320KB

Download
memory/4824-9-0x000000001C860000-0x000000001C912000-memory.dmp

Filesize
712KB

Download
memory/4824-10-0x00007FFC4DD10000-0x00007FFC4E7D2000-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