quasar | 48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79

Analysis

max time kernel
149s
max time network
151s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250207-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250207-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
08-02-2025 16:05

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General

Target

user.exe
Size

3.2MB
MD5

6c6b777d8e1ca16b3f2be293d1b417d4
SHA1

5a2e987253aa8c4606e5e8829c4ab823891226c2
SHA256

48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79
SHA512

fc3698b5eeeb530a45cd58ecec8240a7411070dcb92dff0657e3e67e74b8a42069bd6c96532f2b1a3a33ac0118e17cdf40233abccea303da8ff1747e20b87913
SSDEEP

98304:zWfPAgtmK4/pkEIcqDGrTQBEju6shMcfjWxZkuT8A:KnDmTIBDKTq6s6cfjWX8A

Score

10^/10

quasar installs discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

installs

uptimebot.kozow.com:1433

Mutex

e9dcc42b-891b-4ecf-8c28-a7f0902ea9f5

Attributes

encryption_key
BEAE5A044A95E05C2D32FE96BBDBA968D6356219
install_name
plesk.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Startup
subdirectory
Plesk

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4264-5-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Downloads MZ/PE file 1 IoCs

flow	pid	Process
36	2100	Process not Found

Executes dropped EXE 2 IoCs

pid	Process
3184	plesk.exe
3604	plesk.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5004 set thread context of 4264	5004	user.exe	87
PID 3184 set thread context of 3604	3184	plesk.exe	94

Program crash 2 IoCs

pid	pid_target	Process	procid_target
3784	5004	WerFault.exe	85
4488	3184	WerFault.exe	93

System Location Discovery: System Language Discovery 1 TTPs 7 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	user.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	user.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	plesk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	plesk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2960	MicrosoftEdgeUpdate.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
760	schtasks.exe
3772	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4264	user.exe
Token: SeDebugPrivilege	3604	plesk.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3604	plesk.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 5004 wrote to memory of 3940	5004	user.exe	86
PID 5004 wrote to memory of 3940	5004	user.exe	86
PID 5004 wrote to memory of 3940	5004	user.exe	86
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 5004 wrote to memory of 4264	5004	user.exe	87
PID 4264 wrote to memory of 3772	4264	user.exe	91
PID 4264 wrote to memory of 3772	4264	user.exe	91
PID 4264 wrote to memory of 3772	4264	user.exe	91
PID 4264 wrote to memory of 3184	4264	user.exe	93
PID 4264 wrote to memory of 3184	4264	user.exe	93
PID 4264 wrote to memory of 3184	4264	user.exe	93
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3184 wrote to memory of 3604	3184	plesk.exe	94
PID 3604 wrote to memory of 760	3604	plesk.exe	97
PID 3604 wrote to memory of 760	3604	plesk.exe	97
PID 3604 wrote to memory of 760	3604	plesk.exe	97

C:\Users\Admin\AppData\Local\Temp\user.exe
"C:\Users\Admin\AppData\Local\Temp\user.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5004
- C:\Users\Admin\AppData\Local\Temp\user.exe
  "C:\Users\Admin\AppData\Local\Temp\user.exe"
  2⤵
  PID:3940
- C:\Users\Admin\AppData\Local\Temp\user.exe
  "C:\Users\Admin\AppData\Local\Temp\user.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4264
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3772
- - C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe
    "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3184
  - - C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe
      "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:3604
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:760
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3184 -s 832
      4⤵
      Program crash
      PID:4488
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 5004 -s 840
  2⤵
  - Program crash
  PID:3784

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 5004 -ip 5004
1⤵
PID:6128

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3184 -ip 3184
1⤵
PID:4316

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ping 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-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
1⤵
- System Location Discovery: System Language Discovery
- System Network Configuration Discovery: Internet Connection Discovery
PID:2960

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

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Plesk\plesk.exe

Filesize
3.2MB

MD5
6c6b777d8e1ca16b3f2be293d1b417d4

SHA1
5a2e987253aa8c4606e5e8829c4ab823891226c2

SHA256
48f11a020991c4c5990a1431ef576a7c5e3f502da65fd12a834ad0108310fa79

SHA512
fc3698b5eeeb530a45cd58ecec8240a7411070dcb92dff0657e3e67e74b8a42069bd6c96532f2b1a3a33ac0118e17cdf40233abccea303da8ff1747e20b87913

Download Submit
memory/3184-21-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/3184-20-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/3184-15-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/3184-16-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/3604-24-0x0000000006F90000-0x0000000007042000-memory.dmp

Filesize
712KB

Download
memory/3604-23-0x0000000006D20000-0x0000000006D70000-memory.dmp

Filesize
320KB

Download
memory/3604-22-0x00000000071E0000-0x00000000077F8000-memory.dmp

Filesize
6.1MB

Download
memory/4264-7-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/4264-10-0x0000000005B20000-0x0000000005B2A000-memory.dmp

Filesize
40KB

Download
memory/4264-9-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/4264-8-0x0000000005B70000-0x0000000005C02000-memory.dmp

Filesize
584KB

Download
memory/4264-14-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/4264-5-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/5004-11-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/5004-6-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/5004-0-0x0000000073BCE000-0x0000000073BCF000-memory.dmp

Filesize
4KB

Download
memory/5004-3-0x00000000060C0000-0x0000000006666000-memory.dmp

Filesize
5.6MB

Download
memory/5004-2-0x0000000073BC0000-0x0000000074371000-memory.dmp

Filesize
7.7MB

Download
memory/5004-1-0x0000000000D70000-0x00000000010A6000-memory.dmp

Filesize
3.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads