quasar | 25292e7c037952bac53038432d60eb4799bcf3b507e88fa1073de7000177bcbd

Analysis

max time kernel
91s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
30-01-2023 08:32

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General

Target

e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
Size

2.7MB
MD5

d587b4883793de72536108a8cb6373ef
SHA1

716e123537c7df451eff37da69a7747f8f99e3c1
SHA256

e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1
SHA512

4cab1b454d56ced352905425ca0b9bfc3b532dd0a2cb242f02e099eef11892a44c4f89b8e4930f6ac8b31def7c5ddae419df0369de26911ba51be09e46912687
SSDEEP

49152:Hur58NWGHSN7CNMU7Ptj1oUEQMubc88zCTKRxVjjR8IqSe0HJbYF:Oi1OiMGtqUEQ/g8XGvFj5qSe0HJ

Score

10^/10

quasar success persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

SUCCESS

41.185.97.216:4782

Mutex

MUTEX_QAxMFzrXWG2cbIHPGK

Attributes

encryption_key
JRUJdiIOmPJ5LlsFaVs9
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
cmd
subdirectory
SubDir

Signatures

Modifies WinLogon for persistence 2 TTPs 2 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\VPNClient\\VPNClient.exe\","	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe,\"C:\\Users\\Admin\\AppData\\Roaming\\VPNClient\\VPNClient.exe\","	Client.exe

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4044-136-0x0000000000400000-0x000000000045E000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1312	Client.exe
1360	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
13	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2620 set thread context of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 1312 set thread context of 1360	1312	Client.exe	84

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

T1053

pid	Process
5032	schtasks.exe
2700	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
Token: SeDebugPrivilege	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
Token: SeDebugPrivilege	1312	Client.exe
Token: SeDebugPrivilege	1360	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1360	Client.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 2620 wrote to memory of 2900	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	79
PID 2620 wrote to memory of 2900	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	79
PID 2620 wrote to memory of 2900	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	79
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 2620 wrote to memory of 4044	2620	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	80
PID 4044 wrote to memory of 5032	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	81
PID 4044 wrote to memory of 5032	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	81
PID 4044 wrote to memory of 5032	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	81
PID 4044 wrote to memory of 1312	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	83
PID 4044 wrote to memory of 1312	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	83
PID 4044 wrote to memory of 1312	4044	e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe	83
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1312 wrote to memory of 1360	1312	Client.exe	84
PID 1360 wrote to memory of 2700	1360	Client.exe	85
PID 1360 wrote to memory of 2700	1360	Client.exe	85
PID 1360 wrote to memory of 2700	1360	Client.exe	85

C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
"C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe"
1⤵
- Modifies WinLogon for persistence
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2620
- C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
  C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
  2⤵
  PID:2900
- C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
  C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4044
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:5032
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Modifies WinLogon for persistence
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1312
  - - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1360
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "cmd" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2700

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Winlogon Helper DLL

T1004

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Client.exe.log

Filesize
1KB

MD5
a713c363be116d5ed1f971db6a657e4f

SHA1
90791863564c9ed38e7b4f047022dec4474060a1

SHA256
4b5c446ec8ed2a2696ba00a0890763d413006ce1ea1a7a32fda1655720aef46e

SHA512
5dc740414a6ec30908e924f3bdfae2f761a35a476ef2dda239b789575a0a3696169deb6dc84a14d5828eaa5644623f107b2c686bfa4f54a90f0688239b4b1739

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1.exe.log

Filesize
1KB

MD5
a713c363be116d5ed1f971db6a657e4f

SHA1
90791863564c9ed38e7b4f047022dec4474060a1

SHA256
4b5c446ec8ed2a2696ba00a0890763d413006ce1ea1a7a32fda1655720aef46e

SHA512
5dc740414a6ec30908e924f3bdfae2f761a35a476ef2dda239b789575a0a3696169deb6dc84a14d5828eaa5644623f107b2c686bfa4f54a90f0688239b4b1739

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

Filesize
2.7MB

MD5
d587b4883793de72536108a8cb6373ef

SHA1
716e123537c7df451eff37da69a7747f8f99e3c1

SHA256
e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1

SHA512
4cab1b454d56ced352905425ca0b9bfc3b532dd0a2cb242f02e099eef11892a44c4f89b8e4930f6ac8b31def7c5ddae419df0369de26911ba51be09e46912687

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

Filesize
2.7MB

MD5
d587b4883793de72536108a8cb6373ef

SHA1
716e123537c7df451eff37da69a7747f8f99e3c1

SHA256
e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1

SHA512
4cab1b454d56ced352905425ca0b9bfc3b532dd0a2cb242f02e099eef11892a44c4f89b8e4930f6ac8b31def7c5ddae419df0369de26911ba51be09e46912687

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

Filesize
2.7MB

MD5
d587b4883793de72536108a8cb6373ef

SHA1
716e123537c7df451eff37da69a7747f8f99e3c1

SHA256
e3c292ebdfb1ae04e44bcaa6c41c8ad4c6a1c859175df7b64a7bd9fbf01b6fd1

SHA512
4cab1b454d56ced352905425ca0b9bfc3b532dd0a2cb242f02e099eef11892a44c4f89b8e4930f6ac8b31def7c5ddae419df0369de26911ba51be09e46912687

Download Submit
C:\Users\Admin\AppData\Roaming\VPNClient\VPNClient.exe

Filesize
2.7MB

MD5
5d62b4e6d3e2711ab2b7b8c1814fc137

SHA1
dd4fd95de9976f4bd008900c02cc7a4b5e4b9c17

SHA256
1c67d2fd7adc12219060c5d6e54f9a9d7da095a76239df413edf47971565a029

SHA512
b28e9a94b4a3e0aa1ce4912494b64750b22d3b5874095576af71ed6dbf8fc4efdf8393719bea1b6ae17ecad5f529dbee4f86c2027060182999c4165ff780f48e

Download Submit
memory/1360-153-0x0000000006B30000-0x0000000006B3A000-memory.dmp

Filesize
40KB

Download
memory/2620-132-0x0000000000130000-0x00000000003E2000-memory.dmp

Filesize
2.7MB

Download
memory/2620-133-0x00000000051A0000-0x00000000051C2000-memory.dmp

Filesize
136KB

Download
memory/4044-137-0x0000000006170000-0x0000000006714000-memory.dmp

Filesize
5.6MB

Download
memory/4044-141-0x0000000006E20000-0x0000000006E5C000-memory.dmp

Filesize
240KB

Download
memory/4044-140-0x00000000060E0000-0x00000000060F2000-memory.dmp

Filesize
72KB

Download
memory/4044-139-0x0000000005CC0000-0x0000000005D26000-memory.dmp

Filesize
408KB

Download
memory/4044-138-0x0000000005AB0000-0x0000000005B42000-memory.dmp

Filesize
584KB

Download
memory/4044-136-0x0000000000400000-0x000000000045E000-memory.dmp

Filesize
376KB

Download