quasar | fd5cb342981e9d61398e07e8ccbb12d758b0faec8515ed99c2fe070090b869e0

Analysis

max time kernel
147s
max time network
149s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
28/02/2025, 05:12

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General

Target

test.exe
Size

1.4MB
MD5

b7b90c3d3f12be01a2508b40015cdae3
SHA1

a14a3f57ae4f6d66da36636e41bb95efe4291999
SHA256

fd5cb342981e9d61398e07e8ccbb12d758b0faec8515ed99c2fe070090b869e0
SHA512

0ec46bbce7349bcae6b4068246b6c2a9feb6133697c4d192172878f5f8b5bfcdfbda7e8e06d4d211439e7a1251dd9a0e90d4b7d19ce76e00bb7b6356f16d467d
SSDEEP

12288:qOBn5xPFMHnPHvw+XVTt6uQ4lPPwQ1Mg0xhOyoK5zKpyS1u5XHmIyg:qOfH8QmPwqMgwhfz6imxg

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

advertising-interfaces.gl.at.ply.gg:32479

Mutex

9e444bcd-22a0-41fd-b465-3a16b901895b

Attributes

encryption_key
70773A6AB51CC4D9E9DBC452F577B4BEB037CC32
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
jdk-23_windows-x64
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/3020-1-0x0000000001070000-0x00000000011D4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015686-6.dat	family_quasar
behavioral1/memory/2704-9-0x0000000001030000-0x0000000001194000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2704	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
2652	schtasks.exe
2684	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3020	test.exe
Token: SeDebugPrivilege	2704	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2704	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3020 wrote to memory of 2652	3020	test.exe	30
PID 3020 wrote to memory of 2652	3020	test.exe	30
PID 3020 wrote to memory of 2652	3020	test.exe	30
PID 3020 wrote to memory of 2704	3020	test.exe	32
PID 3020 wrote to memory of 2704	3020	test.exe	32
PID 3020 wrote to memory of 2704	3020	test.exe	32
PID 2704 wrote to memory of 2684	2704	Client.exe	33
PID 2704 wrote to memory of 2684	2704	Client.exe	33
PID 2704 wrote to memory of 2684	2704	Client.exe	33

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\test.exe
"C:\Users\Admin\AppData\Local\Temp\test.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3020
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "jdk-23_windows-x64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2652
- 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:2704
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "jdk-23_windows-x64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2684

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
1.4MB

MD5
b7b90c3d3f12be01a2508b40015cdae3

SHA1
a14a3f57ae4f6d66da36636e41bb95efe4291999

SHA256
fd5cb342981e9d61398e07e8ccbb12d758b0faec8515ed99c2fe070090b869e0

SHA512
0ec46bbce7349bcae6b4068246b6c2a9feb6133697c4d192172878f5f8b5bfcdfbda7e8e06d4d211439e7a1251dd9a0e90d4b7d19ce76e00bb7b6356f16d467d

Download Submit
memory/2704-10-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-9-0x0000000001030000-0x0000000001194000-memory.dmp

Filesize
1.4MB

Download
memory/2704-11-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/2704-12-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/3020-0-0x000007FEF5BB3000-0x000007FEF5BB4000-memory.dmp

Filesize
4KB

Download
memory/3020-1-0x0000000001070000-0x00000000011D4000-memory.dmp

Filesize
1.4MB

Download
memory/3020-2-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download
memory/3020-8-0x000007FEF5BB0000-0x000007FEF659C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads