quasar | a3e14e4d2d7e379acd49b087d803e4651df001ee6596447a35f1afe23750df93

Analysis

max time kernel
126s
max time network
139s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
10-02-2025 03:02

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General

Target

44.exe
Size

3.1MB
MD5

f57d584af554ff7a5af7f2e907575661
SHA1

98d2c4bd90fff59ea67e3112dc753a140cc3324a
SHA256

a3e14e4d2d7e379acd49b087d803e4651df001ee6596447a35f1afe23750df93
SHA512

1229c15dfb75164da3533613adeddd8b0916b6a36ebaf9c25932b998bc718ced042341fdc88270a635fba3905bbeac49acbc72f88d55ecffb8e9dacfb66ca839
SSDEEP

49152:ivkt62XlaSFNWPjljiFa2RoUYIbF73/QBxTLoGdTmcTHHB72eh2NT:iv462XlaSFNWPjljiFXRoUYIt3/ci

Score

10^/10

quasar clients4 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

clients4

193.143.1.121:9669

Mutex

47e9495b-6eb3-43b3-87fd-6dee9f4b772a

Attributes

encryption_key
B4A0A2EFBE8C22E116B4B6DCCD6B4CC8DB5CB9C6
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
OneDrive
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/2788-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp	family_quasar
behavioral1/files/0x001100000001924f-6.dat	family_quasar
behavioral1/memory/2936-10-0x00000000003D0000-0x00000000006F4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2936	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
2692	schtasks.exe
2736	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2788	44.exe
Token: SeDebugPrivilege	2936	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2936	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2788 wrote to memory of 2692	2788	44.exe	30
PID 2788 wrote to memory of 2692	2788	44.exe	30
PID 2788 wrote to memory of 2692	2788	44.exe	30
PID 2788 wrote to memory of 2936	2788	44.exe	32
PID 2788 wrote to memory of 2936	2788	44.exe	32
PID 2788 wrote to memory of 2936	2788	44.exe	32
PID 2936 wrote to memory of 2736	2936	Client.exe	33
PID 2936 wrote to memory of 2736	2936	Client.exe	33
PID 2936 wrote to memory of 2736	2936	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\44.exe
"C:\Users\Admin\AppData\Local\Temp\44.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2788
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "OneDrive" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2692
- 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:2936
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "OneDrive" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2736

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
f57d584af554ff7a5af7f2e907575661

SHA1
98d2c4bd90fff59ea67e3112dc753a140cc3324a

SHA256
a3e14e4d2d7e379acd49b087d803e4651df001ee6596447a35f1afe23750df93

SHA512
1229c15dfb75164da3533613adeddd8b0916b6a36ebaf9c25932b998bc718ced042341fdc88270a635fba3905bbeac49acbc72f88d55ecffb8e9dacfb66ca839

Download Submit
memory/2788-0-0x000007FEF62E3000-0x000007FEF62E4000-memory.dmp

Filesize
4KB

Download
memory/2788-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp

Filesize
3.1MB

Download
memory/2788-2-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2788-8-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2936-10-0x00000000003D0000-0x00000000006F4000-memory.dmp

Filesize
3.1MB

Download
memory/2936-9-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2936-11-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2936-12-0x000007FEF62E0000-0x000007FEF6CCC000-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