quasar | 66ce2cfe8bba297b050a3c2a46930bde05d45eb9be046be857a09dae4b6ac558

Analysis

max time kernel
273s
max time network
280s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
06-11-2024 22:29

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General

Target

yghjhfdttnuydrn.exe
Size

3.1MB
MD5

c4683d3d264c3a2aa2305903dd489658
SHA1

6e1f617bdb312e460dfdcd8086f97b7ee792d4d4
SHA256

66ce2cfe8bba297b050a3c2a46930bde05d45eb9be046be857a09dae4b6ac558
SHA512

fb318b8d786fa0d17ba7c6837e1b0ec912768a32362cd14b7a4204167a8a743f1686c9919ad63ed8afa9fea20cd0997bd346a2bbda81addce355a2d59e6b5e18
SSDEEP

49152:yvyI22SsaNYfdPBldt698dBcjHVsu3NxKRoGHIwTHHB72eh2NT:yvf22SsaNYfdPBldt6+dBcjHVsCNxA

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.9:62767

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/1980-1-0x00000000001F0000-0x0000000000514000-memory.dmp	family_quasar
behavioral1/files/0x00280000000450bc-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3316	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
4952	schtasks.exe
1856	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1980	yghjhfdttnuydrn.exe
Token: SeDebugPrivilege	3316	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3316	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1980 wrote to memory of 4952	1980	yghjhfdttnuydrn.exe	83
PID 1980 wrote to memory of 4952	1980	yghjhfdttnuydrn.exe	83
PID 1980 wrote to memory of 3316	1980	yghjhfdttnuydrn.exe	85
PID 1980 wrote to memory of 3316	1980	yghjhfdttnuydrn.exe	85
PID 3316 wrote to memory of 1856	3316	Client.exe	86
PID 3316 wrote to memory of 1856	3316	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\yghjhfdttnuydrn.exe
"C:\Users\Admin\AppData\Local\Temp\yghjhfdttnuydrn.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1980
- 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:4952
- 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:3316
- - 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:1856

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
c4683d3d264c3a2aa2305903dd489658

SHA1
6e1f617bdb312e460dfdcd8086f97b7ee792d4d4

SHA256
66ce2cfe8bba297b050a3c2a46930bde05d45eb9be046be857a09dae4b6ac558

SHA512
fb318b8d786fa0d17ba7c6837e1b0ec912768a32362cd14b7a4204167a8a743f1686c9919ad63ed8afa9fea20cd0997bd346a2bbda81addce355a2d59e6b5e18

Download Submit
memory/1980-0-0x00007FFAE0C63000-0x00007FFAE0C65000-memory.dmp

Filesize
8KB

Download
memory/1980-1-0x00000000001F0000-0x0000000000514000-memory.dmp

Filesize
3.1MB

Download
memory/1980-2-0x00007FFAE0C60000-0x00007FFAE1722000-memory.dmp

Filesize
10.8MB

Download
memory/1980-6-0x00007FFAE0C60000-0x00007FFAE1722000-memory.dmp

Filesize
10.8MB

Download
memory/3316-5-0x00007FFAE0C60000-0x00007FFAE1722000-memory.dmp

Filesize
10.8MB

Download
memory/3316-7-0x00007FFAE0C60000-0x00007FFAE1722000-memory.dmp

Filesize
10.8MB

Download
memory/3316-8-0x000000001B9D0000-0x000000001BA20000-memory.dmp

Filesize
320KB

Download
memory/3316-9-0x000000001CF00000-0x000000001CFB2000-memory.dmp

Filesize
712KB

Download
memory/3316-10-0x00007FFAE0C60000-0x00007FFAE1722000-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