quasar | b7a2def2630cbbca20d06f0d40ceaf00f8df471adb12f62efbeb513681cf4878

Analysis

max time kernel
136s
max time network
147s
platform
windows11-21h2_x64
resource
win11-20250410-en
resource tags

arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
submitted
15/04/2025, 23:20

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General

Target

quarantine/CBOZ4ZK.exe
Size

3.7MB
MD5

76ca7e7638670b4dd35fe71bf685bca5
SHA1

6c6653527ea165917f885fc31cc2e6f6a4022d58
SHA256

4c9905293811b4b96ebf835995398546a9dd899f171fbf40285dc93884846d82
SHA512

3d40a6e86b8438ab1e71a7a8c6860508e32a531a0c54fd5bb2072537a435d3698e564a64bc3ab9a2e87f93cbed17633950c3dc9c17d70a2738a878d3a3fbb467
SSDEEP

98304:kNlHTnyU8Jhf78/ltPw1dTnyU8Jhf78/ltPw1W:KHChj8/fwHChj8/fw8

Score

10^/10

quasar discovery spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
28FC4A95F224F2FFF41FECAA62178F6B0DF5F974
reconnect_delay
3000

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral8/memory/2356-0-0x0000000000400000-0x000000000058E000-memory.dmp	family_quasar

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4948 set thread context of 2356	4948	CBOZ4ZK.exe	80

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MSBuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
5712	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2356	MSBuild.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2356	MSBuild.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2356	MSBuild.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 4948 wrote to memory of 4868	4948	CBOZ4ZK.exe	78
PID 4948 wrote to memory of 4868	4948	CBOZ4ZK.exe	78
PID 4948 wrote to memory of 4868	4948	CBOZ4ZK.exe	78
PID 4948 wrote to memory of 2652	4948	CBOZ4ZK.exe	79
PID 4948 wrote to memory of 2652	4948	CBOZ4ZK.exe	79
PID 4948 wrote to memory of 2652	4948	CBOZ4ZK.exe	79
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 4948 wrote to memory of 2356	4948	CBOZ4ZK.exe	80
PID 2356 wrote to memory of 5712	2356	MSBuild.exe	81
PID 2356 wrote to memory of 5712	2356	MSBuild.exe	81
PID 2356 wrote to memory of 5712	2356	MSBuild.exe	81

C:\Users\Admin\AppData\Local\Temp\quarantine\CBOZ4ZK.exe
"C:\Users\Admin\AppData\Local\Temp\quarantine\CBOZ4ZK.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4948
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  PID:4868
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  PID:2652
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2356
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Pulsar Client Startup" /sc ONLOGON /tr "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5712

Network

MITRE ATT&CK Enterprise v16

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2356-0-0x0000000000400000-0x000000000058E000-memory.dmp

Filesize
1.6MB

Download
memory/2356-1-0x0000000074DBE000-0x0000000074DBF000-memory.dmp

Filesize
4KB

Download
memory/2356-2-0x0000000005740000-0x0000000005CE6000-memory.dmp

Filesize
5.6MB

Download
memory/2356-3-0x0000000005230000-0x00000000052C2000-memory.dmp

Filesize
584KB

Download
memory/2356-4-0x0000000005140000-0x000000000515A000-memory.dmp

Filesize
104KB

Download
memory/2356-5-0x0000000074DB0000-0x0000000075561000-memory.dmp

Filesize
7.7MB

Download
memory/2356-6-0x00000000053F0000-0x00000000053FA000-memory.dmp

Filesize
40KB

Download
memory/2356-7-0x0000000005720000-0x0000000005732000-memory.dmp

Filesize
72KB

Download
memory/2356-8-0x0000000005F30000-0x0000000005F6A000-memory.dmp

Filesize
232KB

Download
memory/2356-9-0x00000000060D0000-0x0000000006120000-memory.dmp

Filesize
320KB

Download
memory/2356-10-0x0000000006340000-0x00000000063F2000-memory.dmp

Filesize
712KB

Download
memory/2356-11-0x00000000062A0000-0x00000000062EE000-memory.dmp

Filesize
312KB

Download
memory/2356-12-0x0000000006440000-0x000000000648C000-memory.dmp

Filesize
304KB

Download
memory/2356-13-0x0000000006490000-0x00000000064DA000-memory.dmp

Filesize
296KB

Download
memory/2356-14-0x0000000006400000-0x000000000642A000-memory.dmp

Filesize
168KB

Download
memory/2356-15-0x0000000074DBE000-0x0000000074DBF000-memory.dmp

Filesize
4KB

Download
memory/2356-16-0x0000000074DB0000-0x0000000075561000-memory.dmp

Filesize
7.7MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads