quasar | 1ca88e53459076619192ce06bd6532599c399836e969df16d5724fb2af9652d7

Analysis

max time kernel
125s
max time network
142s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
07-02-2025 00:20

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General

Target

TestFile.exe
Size

3.2MB
MD5

cfa0c860a76a2cb8e15dcfe774097dc8
SHA1

4aeb7456b619f539e6f50cc8795d4e9307ff5317
SHA256

1ca88e53459076619192ce06bd6532599c399836e969df16d5724fb2af9652d7
SHA512

aebc2f8127c87b4a4f8ad57a3689bc5720db499fecadd751b3f683d3b7ccf68cb4dd2280fc09df835963e4aedb2ed512ca89f35cd2a48ce355595691a5c14aa1
SSDEEP

49152:YvAt62XlaSFNWPjljiFa2RoUYIiyfRlBx1ToGd3STHHB72eh2NT:Yvs62XlaSFNWPjljiFXRoUYIHR/H

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

12.75.114.52:4782

Mutex

d942a9a5-3785-41ac-a7db-12e8f1fb6c3d

Attributes

encryption_key
E662E8B331BDD6D3B27E1C68FDDE49A9178AEBE8
install_name
A.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/1456-1-0x00000000002C0000-0x00000000005F4000-memory.dmp	family_quasar
behavioral1/files/0x001b00000002ab97-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
764	A.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\A.exe	TestFile.exe
File opened for modification	C:\Program Files\SubDir\A.exe	TestFile.exe
File opened for modification	C:\Program Files\SubDir	TestFile.exe
File opened for modification	C:\Program Files\SubDir\A.exe	A.exe
File opened for modification	C:\Program Files\SubDir	A.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
3608	schtasks.exe
4180	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1456	TestFile.exe
Token: SeDebugPrivilege	764	A.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
764	A.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1456 wrote to memory of 3608	1456	TestFile.exe	77
PID 1456 wrote to memory of 3608	1456	TestFile.exe	77
PID 1456 wrote to memory of 764	1456	TestFile.exe	79
PID 1456 wrote to memory of 764	1456	TestFile.exe	79
PID 764 wrote to memory of 4180	764	A.exe	80
PID 764 wrote to memory of 4180	764	A.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\TestFile.exe
"C:\Users\Admin\AppData\Local\Temp\TestFile.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1456
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\A.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3608
- C:\Program Files\SubDir\A.exe
  "C:\Program Files\SubDir\A.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:764
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\A.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4180

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:\Program Files\SubDir\A.exe

Filesize
3.2MB

MD5
cfa0c860a76a2cb8e15dcfe774097dc8

SHA1
4aeb7456b619f539e6f50cc8795d4e9307ff5317

SHA256
1ca88e53459076619192ce06bd6532599c399836e969df16d5724fb2af9652d7

SHA512
aebc2f8127c87b4a4f8ad57a3689bc5720db499fecadd751b3f683d3b7ccf68cb4dd2280fc09df835963e4aedb2ed512ca89f35cd2a48ce355595691a5c14aa1

Download Submit
memory/764-10-0x00007FF881770000-0x00007FF882232000-memory.dmp

Filesize
10.8MB

Download
memory/764-11-0x00007FF881770000-0x00007FF882232000-memory.dmp

Filesize
10.8MB

Download
memory/764-12-0x0000000003180000-0x00000000031D0000-memory.dmp

Filesize
320KB

Download
memory/764-13-0x000000001C710000-0x000000001C7C2000-memory.dmp

Filesize
712KB

Download
memory/764-14-0x000000001CE00000-0x000000001D328000-memory.dmp

Filesize
5.2MB

Download
memory/764-15-0x00007FF881770000-0x00007FF882232000-memory.dmp

Filesize
10.8MB

Download
memory/1456-0-0x00007FF881773000-0x00007FF881775000-memory.dmp

Filesize
8KB

Download
memory/1456-1-0x00000000002C0000-0x00000000005F4000-memory.dmp

Filesize
3.2MB

Download
memory/1456-2-0x00007FF881770000-0x00007FF882232000-memory.dmp

Filesize
10.8MB

Download
memory/1456-9-0x00007FF881770000-0x00007FF882232000-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