quasar | 6681cb73deb0effc4f44f704c6bddb07e98c1f8da4c8478cca7ddd49abdb0c3f

Analysis

max time kernel
126s
max time network
144s
platform
windows7_x64
resource
win7-20250207-en
resource tags

arch:x64arch:x86image:win7-20250207-enlocale:en-usos:windows7-x64system
submitted
22/03/2025, 06:08

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General

Target

1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
Size

3.1MB
MD5

35110eedb3518d1905b88025bf11b77d
SHA1

c39e96cc0dcb14065984c3d3fbff331070e37feb
SHA256

1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd
SHA512

08a3db05d373eb18f9b86fcea5b4338bd4cf3ca60df9906873bc0eb4d2dd6bc544890d23543df9be0848647d89a14d51010a7498bf8041c6872d8af768e035d2
SSDEEP

49152:DvDI22SsaNYfdPBldt698dBcjHEhE3uarOLoGdtTHHB72eh2NT:Dv822SsaNYfdPBldt6+dBcjHZ3I

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.55:4782

Mutex

87124d35-b950-4c06-bdf9-de6bd7aaa9ef

Attributes

encryption_key
CF3A949D653E8E253D64DB361EE16669CD9DE402
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 3 IoCs

resource	yara_rule
behavioral27/memory/1192-1-0x0000000000E20000-0x0000000001144000-memory.dmp	family_quasar
behavioral27/files/0x0009000000016d7b-6.dat	family_quasar
behavioral27/memory/2520-8-0x0000000000270000-0x0000000000594000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2520	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
1660	schtasks.exe
2912	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
Token: SeDebugPrivilege	2520	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2520	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1192 wrote to memory of 1660	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	30
PID 1192 wrote to memory of 1660	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	30
PID 1192 wrote to memory of 1660	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	30
PID 1192 wrote to memory of 2520	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	32
PID 1192 wrote to memory of 2520	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	32
PID 1192 wrote to memory of 2520	1192	1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe	32
PID 2520 wrote to memory of 2912	2520	Client.exe	33
PID 2520 wrote to memory of 2912	2520	Client.exe	33
PID 2520 wrote to memory of 2912	2520	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\1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe
"C:\Users\Admin\AppData\Local\Temp\1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1192
- 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:1660
- 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:2520
- - 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:2912

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
35110eedb3518d1905b88025bf11b77d

SHA1
c39e96cc0dcb14065984c3d3fbff331070e37feb

SHA256
1bbf7d818b40f8fa0da224e39f27829bb7d8a8bdbec66fa62cfba39cd0d6d3fd

SHA512
08a3db05d373eb18f9b86fcea5b4338bd4cf3ca60df9906873bc0eb4d2dd6bc544890d23543df9be0848647d89a14d51010a7498bf8041c6872d8af768e035d2

Download Submit
memory/1192-0-0x000007FEF5403000-0x000007FEF5404000-memory.dmp

Filesize
4KB

Download
memory/1192-1-0x0000000000E20000-0x0000000001144000-memory.dmp

Filesize
3.1MB

Download
memory/1192-2-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/1192-10-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2520-9-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2520-8-0x0000000000270000-0x0000000000594000-memory.dmp

Filesize
3.1MB

Download
memory/2520-11-0x000007FEF5400000-0x000007FEF5DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2520-12-0x000007FEF5400000-0x000007FEF5DEC000-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