quasar | 47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357

Analysis

max time kernel
134s
max time network
136s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
14-06-2024 23:09

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General

Target

Client-built.exe
Size

405KB
MD5

0c84b58a5322284269f3b86e648e1fc8
SHA1

6776c3963a64a3ace4caaff164669364356f72aa
SHA256

47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357
SHA512

02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7
SSDEEP

6144:yphjZx5jbx+DgrQo2fVH/i96bpjWprW5hthvo5lDzWEi5HFkgDVc:kjrZbaVfi6SGfel/WnHxDVc

Score

10^/10

quasar school spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

School

runderscore00-37568.portmap.host:37568

Mutex

QSR_MUTEX_BNyj3AdZ8NIXACv5S5

Attributes

encryption_key
G3FFg7Ec2ieFqaQw5SZ2
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 payload 2 IoCs

resource	yara_rule
behavioral1/memory/4496-1-0x0000000000F10000-0x0000000000F7C000-memory.dmp	family_quasar
behavioral1/files/0x000800000001ac67-11.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4936	Client.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	ip-api.com

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
4720	schtasks.exe
1796	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4496	Client-built.exe
Token: SeDebugPrivilege	4936	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4936	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4496 wrote to memory of 4720	4496	Client-built.exe	75
PID 4496 wrote to memory of 4720	4496	Client-built.exe	75
PID 4496 wrote to memory of 4720	4496	Client-built.exe	75
PID 4496 wrote to memory of 4936	4496	Client-built.exe	77
PID 4496 wrote to memory of 4936	4496	Client-built.exe	77
PID 4496 wrote to memory of 4936	4496	Client-built.exe	77
PID 4936 wrote to memory of 1796	4936	Client.exe	78
PID 4936 wrote to memory of 1796	4936	Client.exe	78
PID 4936 wrote to memory of 1796	4936	Client.exe	78

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4496
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4720
- 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:4936
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1796

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
405KB

MD5
0c84b58a5322284269f3b86e648e1fc8

SHA1
6776c3963a64a3ace4caaff164669364356f72aa

SHA256
47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357

SHA512
02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7

Download Submit
memory/4496-6-0x0000000006460000-0x0000000006472000-memory.dmp

Filesize
72KB

Download
memory/4496-1-0x0000000000F10000-0x0000000000F7C000-memory.dmp

Filesize
432KB

Download
memory/4496-3-0x0000000005820000-0x00000000058B2000-memory.dmp

Filesize
584KB

Download
memory/4496-4-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download
memory/4496-5-0x00000000058C0000-0x0000000005926000-memory.dmp

Filesize
408KB

Download
memory/4496-0-0x00000000739EE000-0x00000000739EF000-memory.dmp

Filesize
4KB

Download
memory/4496-7-0x0000000006850000-0x000000000688E000-memory.dmp

Filesize
248KB

Download
memory/4496-2-0x0000000005BE0000-0x00000000060DE000-memory.dmp

Filesize
5.0MB

Download
memory/4496-14-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download
memory/4936-15-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download
memory/4936-16-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download
memory/4936-18-0x0000000006300000-0x000000000630A000-memory.dmp

Filesize
40KB

Download
memory/4936-19-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download
memory/4936-20-0x00000000739E0000-0x00000000740CE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads