quasar | c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb

Analysis

max time kernel
126s
max time network
137s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
11-02-2025 12:19

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General

Target

BRAVE0DELAYTWEAK.exe
Size

3.1MB
MD5

55e769e400d3e75b8fe9dffb125227ef
SHA1

f838b94d46a3508733647d77799c85c4e4105570
SHA256

c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb
SHA512

456a5d0380bb48c9e8e54b1c6838e104526dfd03842c8604c1174dc4c97e8ee092b0272c65013b855b8b4d97c7bfdc70fc751a923940cb9e9899dfddb911e130
SSDEEP

49152:HvjI22SsaNYfdPBldt698dBcjHr+WrqMfnLoGdKTHHB72eh2NT:Hvc22SsaNYfdPBldt6+dBcjHr+WrB

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.167:4782

Mutex

3917b32f-8662-48d7-b61d-8cea2441c8ec

Attributes

encryption_key
72E193AB5763F565E9AFABEC0486B91F3F3A0AE2
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
behavioral1/memory/2016-1-0x0000000001060000-0x0000000001384000-memory.dmp	family_quasar
behavioral1/files/0x0009000000015cd1-5.dat	family_quasar
behavioral1/memory/1112-9-0x0000000000DC0000-0x00000000010E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1112	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
2604	schtasks.exe
2876	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2016	BRAVE0DELAYTWEAK.exe
Token: SeDebugPrivilege	1112	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1112	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2016 wrote to memory of 2604	2016	BRAVE0DELAYTWEAK.exe	30
PID 2016 wrote to memory of 2604	2016	BRAVE0DELAYTWEAK.exe	30
PID 2016 wrote to memory of 2604	2016	BRAVE0DELAYTWEAK.exe	30
PID 2016 wrote to memory of 1112	2016	BRAVE0DELAYTWEAK.exe	32
PID 2016 wrote to memory of 1112	2016	BRAVE0DELAYTWEAK.exe	32
PID 2016 wrote to memory of 1112	2016	BRAVE0DELAYTWEAK.exe	32
PID 1112 wrote to memory of 2876	1112	Client.exe	33
PID 1112 wrote to memory of 2876	1112	Client.exe	33
PID 1112 wrote to memory of 2876	1112	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\BRAVE0DELAYTWEAK.exe
"C:\Users\Admin\AppData\Local\Temp\BRAVE0DELAYTWEAK.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2016
- 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:2604
- 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:1112
- - 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:2876

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
55e769e400d3e75b8fe9dffb125227ef

SHA1
f838b94d46a3508733647d77799c85c4e4105570

SHA256
c5f16f0da5feac491f0cd84eb08fa2f994f850e64f0e1fe24018b193b06294fb

SHA512
456a5d0380bb48c9e8e54b1c6838e104526dfd03842c8604c1174dc4c97e8ee092b0272c65013b855b8b4d97c7bfdc70fc751a923940cb9e9899dfddb911e130

Download Submit
memory/1112-7-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/1112-9-0x0000000000DC0000-0x00000000010E4000-memory.dmp

Filesize
3.1MB

Download
memory/1112-10-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/1112-11-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2016-0-0x000007FEF55E3000-0x000007FEF55E4000-memory.dmp

Filesize
4KB

Download
memory/2016-1-0x0000000001060000-0x0000000001384000-memory.dmp

Filesize
3.1MB

Download
memory/2016-2-0x000007FEF55E0000-0x000007FEF5FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2016-8-0x000007FEF55E0000-0x000007FEF5FCC000-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