quasar | 8a1d71513cdce5e817498afbad431e391d3175b214c413865002e867ac1d3d00

Analysis

max time kernel
17s
max time network
18s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
04-02-2025 09:17

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General

Target

Client-built.exe
Size

3.1MB
MD5

37390da369108249457dd4fa9d71374a
SHA1

b4a1d1e2ea0762ed45cc93ed236763756dfc53df
SHA256

8a1d71513cdce5e817498afbad431e391d3175b214c413865002e867ac1d3d00
SHA512

dfd1013637e17c45eee06815e26f9a271d68b6df4e088cbb69f6558228cda9876ad60c89d703e4ec2fe693f9c7064533d3b479e867db2c349e668c043ac79fed
SSDEEP

49152:Gvkt62XlaSFNWPjljiFa2RoUYI1wehoGd2ITHHB72eh2NT:Gv462XlaSFNWPjljiFXRoUYI1w8m

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

d363416c-217e-45a7-a228-bcea554cbb52

Attributes

encryption_key
3CD249B929C321E41C5A0D2E0931073C27A2E729
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
dlscord
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/5284-1-0x0000000000E50000-0x0000000001174000-memory.dmp	family_quasar
behavioral1/files/0x001b00000002ab87-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3840	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
3248	schtasks.exe
5948	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5284	Client-built.exe
Token: SeDebugPrivilege	3840	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3840	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5284 wrote to memory of 3248	5284	Client-built.exe	77
PID 5284 wrote to memory of 3248	5284	Client-built.exe	77
PID 5284 wrote to memory of 3840	5284	Client-built.exe	79
PID 5284 wrote to memory of 3840	5284	Client-built.exe	79
PID 3840 wrote to memory of 5948	3840	Client.exe	80
PID 3840 wrote to memory of 5948	3840	Client.exe	80

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:5284
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dlscord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3248
- 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:3840
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "dlscord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5948

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
37390da369108249457dd4fa9d71374a

SHA1
b4a1d1e2ea0762ed45cc93ed236763756dfc53df

SHA256
8a1d71513cdce5e817498afbad431e391d3175b214c413865002e867ac1d3d00

SHA512
dfd1013637e17c45eee06815e26f9a271d68b6df4e088cbb69f6558228cda9876ad60c89d703e4ec2fe693f9c7064533d3b479e867db2c349e668c043ac79fed

Download Submit
memory/3840-10-0x00007FFC57630000-0x00007FFC580F2000-memory.dmp

Filesize
10.8MB

Download
memory/3840-11-0x00007FFC57630000-0x00007FFC580F2000-memory.dmp

Filesize
10.8MB

Download
memory/3840-12-0x0000000003030000-0x0000000003080000-memory.dmp

Filesize
320KB

Download
memory/3840-13-0x000000001C7A0000-0x000000001C852000-memory.dmp

Filesize
712KB

Download
memory/3840-14-0x00007FFC57630000-0x00007FFC580F2000-memory.dmp

Filesize
10.8MB

Download
memory/5284-0-0x00007FFC57633000-0x00007FFC57635000-memory.dmp

Filesize
8KB

Download
memory/5284-1-0x0000000000E50000-0x0000000001174000-memory.dmp

Filesize
3.1MB

Download
memory/5284-2-0x00007FFC57630000-0x00007FFC580F2000-memory.dmp

Filesize
10.8MB

Download
memory/5284-9-0x00007FFC57630000-0x00007FFC580F2000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads