quasar | d0030ab6b4ed701eca6cad94f123517f564edb6a17ca33cbe6415cea10ac1401

General

Target

Client-built.exe
Size

348KB
MD5

e8ecdeb99f70e49718a4fc9986f86df3
SHA1

4f50bde0200a60dfe74a957a4f927e5648e2e78f
SHA256

d0030ab6b4ed701eca6cad94f123517f564edb6a17ca33cbe6415cea10ac1401
SHA512

f04bbab81c20eb22315914d20fa3d34761e0821592189b12c8821b311a3056f9c767bfc57eb41403c55a5eeb0cef50575686c1766ccfb164c5bb1892637c37ba
SSDEEP

6144:SRNHXf500Mr7ULWRbNlPyDg+Rve9cc6i0pzci:Kd50xUxs+RWGcdOzci

Score

10^/10

quasar test discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Test

C2

5.tcp.eu.ngrok.io:13432

5.tcp.eu.ngrok.io:8080

Mutex

QSR_MUTEX_zDi3X3iiANcUc0nFPZ

Attributes

encryption_key
10b0G4xQi1VrldATZzJ7
install_name
win.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Runtime
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4544-1-0x0000000000C10000-0x0000000000C6E000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c77-10.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3184	win.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs

Web Service

T1102

flow	ioc
55	5.tcp.eu.ngrok.io
16	5.tcp.eu.ngrok.io
45	5.tcp.eu.ngrok.io
52	5.tcp.eu.ngrok.io

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
5	ip-api.com

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\SubDir\win.exe	Client-built.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\win.exe	Client-built.exe

System Location Discovery: System Language Discovery 1 TTPs 4 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	Client-built.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	win.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
3524	schtasks.exe
4416	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4544	Client-built.exe
Token: SeDebugPrivilege	3184	win.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3184	win.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 4544 wrote to memory of 3524	4544	Client-built.exe	85
PID 4544 wrote to memory of 3524	4544	Client-built.exe	85
PID 4544 wrote to memory of 3524	4544	Client-built.exe	85
PID 4544 wrote to memory of 3184	4544	Client-built.exe	87
PID 4544 wrote to memory of 3184	4544	Client-built.exe	87
PID 4544 wrote to memory of 3184	4544	Client-built.exe	87
PID 3184 wrote to memory of 4416	3184	win.exe	89
PID 3184 wrote to memory of 4416	3184	win.exe	89
PID 3184 wrote to memory of 4416	3184	win.exe	89

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4544
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Windows Runtime" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:3524
- C:\Windows\SysWOW64\SubDir\win.exe
  "C:\Windows\SysWOW64\SubDir\win.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3184
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Runtime" /sc ONLOGON /tr "C:\Windows\SysWOW64\SubDir\win.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4416

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Windows\SysWOW64\SubDir\win.exe

Filesize
348KB

MD5
e8ecdeb99f70e49718a4fc9986f86df3

SHA1
4f50bde0200a60dfe74a957a4f927e5648e2e78f

SHA256
d0030ab6b4ed701eca6cad94f123517f564edb6a17ca33cbe6415cea10ac1401

SHA512
f04bbab81c20eb22315914d20fa3d34761e0821592189b12c8821b311a3056f9c767bfc57eb41403c55a5eeb0cef50575686c1766ccfb164c5bb1892637c37ba

Download Submit
memory/3184-18-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/3184-17-0x00000000061F0000-0x00000000061FA000-memory.dmp

Filesize
40KB

Download
memory/3184-15-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/3184-13-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/4544-3-0x0000000005720000-0x00000000057B2000-memory.dmp

Filesize
584KB

Download
memory/4544-6-0x0000000005840000-0x0000000005852000-memory.dmp

Filesize
72KB

Download
memory/4544-7-0x00000000069E0000-0x0000000006A1C000-memory.dmp

Filesize
240KB

Download
memory/4544-5-0x0000000005670000-0x00000000056D6000-memory.dmp

Filesize
408KB

Download
memory/4544-4-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/4544-14-0x0000000074BE0000-0x0000000075390000-memory.dmp

Filesize
7.7MB

Download
memory/4544-0-0x0000000074BEE000-0x0000000074BEF000-memory.dmp

Filesize
4KB

Download
memory/4544-2-0x0000000005CD0000-0x0000000006274000-memory.dmp

Filesize
5.6MB

Download
memory/4544-1-0x0000000000C10000-0x0000000000C6E000-memory.dmp

Filesize
376KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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