quasar | 6c4367e763852b7afe852905e9d7baba18ac33c1e4eaf8370350824fb3ffce86

Reason

Machine shutdown

General

Target

Synapse X Launcher.exe
Size

3.2MB
MD5

3854a6572a9a5a25bccbd13664713915
SHA1

b7c3ca681c1dcb328113c5966bbd96aed541ae64
SHA256

6c4367e763852b7afe852905e9d7baba18ac33c1e4eaf8370350824fb3ffce86
SHA512

80fb1425c57d7984da87349efdc0c4508296b58548e62ee4743215edd1058818154cb1207b95ec74299c7b61953f19f71c6ab0d325126efd21d8c5749ad69452
SSDEEP

49152:pvblL26AaNeWgPhlmVqvMQ7XSKB/RJ6UbR3LoGdM+THHB72eh2NTgj:pvBL26AaNeWgPhlmVqkQ7XSKB/RJ6e

Score

10^/10

quasar windows update spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Windows Update

C2

espinyskibidi-29823.portmap.host:29823

Mutex

a94ba996-69af-4720-85e6-f4929c5eb0f8

Attributes

encryption_key
6F721445F7E0B1CF58980D84A9D49F4458D4EFD9
install_name
Update.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update Startup
subdirectory
Windows Update

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2304-1-0x0000000000BB0000-0x0000000000EF2000-memory.dmp	family_quasar
C:\Windows\System32\Windows Update\Update.exe	family_quasar

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

Update.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation Update.exe
Executes dropped EXE 1 IoCs

Processes:

Update.exe

pid process

3972 Update.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	Update.exe

pid	process
3972	Update.exe

Drops file in System32 directory 5 IoCs

Processes:

Synapse X Launcher.exeUpdate.exe

description	ioc	process
File created	C:\Windows\system32\Windows Update\Update.exe	Synapse X Launcher.exe
File opened for modification	C:\Windows\system32\Windows Update\Update.exe	Synapse X Launcher.exe
File opened for modification	C:\Windows\system32\Windows Update	Synapse X Launcher.exe
File opened for modification	C:\Windows\system32\Windows Update\Update.exe	Update.exe
File opened for modification	C:\Windows\system32\Windows Update	Update.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

Processes:

schtasks.exeschtasks.exe

pid process

1888 schtasks.exe
3500 schtasks.exe

pid	process
1888	schtasks.exe
3500	schtasks.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "197"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Synapse X Launcher.exeUpdate.exeshutdown.exe

description	pid	process
Token: SeDebugPrivilege	2304	Synapse X Launcher.exe
Token: SeDebugPrivilege	3972	Update.exe
Token: SeShutdownPrivilege	2040	shutdown.exe
Token: SeRemoteShutdownPrivilege	2040	shutdown.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

LogonUI.exe

pid process

3312 LogonUI.exe

pid	process
3312	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Synapse X Launcher.exeUpdate.exe

description	pid	process	target process
PID 2304 wrote to memory of 1888	2304	Synapse X Launcher.exe	schtasks.exe
PID 2304 wrote to memory of 1888	2304	Synapse X Launcher.exe	schtasks.exe
PID 2304 wrote to memory of 3972	2304	Synapse X Launcher.exe	Update.exe
PID 2304 wrote to memory of 3972	2304	Synapse X Launcher.exe	Update.exe
PID 3972 wrote to memory of 3500	3972	Update.exe	schtasks.exe
PID 3972 wrote to memory of 3500	3972	Update.exe	schtasks.exe
PID 3972 wrote to memory of 2040	3972	Update.exe	shutdown.exe
PID 3972 wrote to memory of 2040	3972	Update.exe	shutdown.exe

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\Synapse X Launcher.exe
"C:\Users\Admin\AppData\Local\Temp\Synapse X Launcher.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2304

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Update Startup" /sc ONLOGON /tr "C:\Windows\system32\Windows Update\Update.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1888

C:\Windows\system32\Windows Update\Update.exe
"C:\Windows\system32\Windows Update\Update.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3972

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Update Startup" /sc ONLOGON /tr "C:\Windows\system32\Windows Update\Update.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3500

C:\Windows\System32\shutdown.exe
"C:\Windows\System32\shutdown.exe" /s /t 0
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:2040

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3958055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:3312

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Windows\System32\Windows Update\Update.exe

Filesize
3.2MB

MD5
3854a6572a9a5a25bccbd13664713915

SHA1
b7c3ca681c1dcb328113c5966bbd96aed541ae64

SHA256
6c4367e763852b7afe852905e9d7baba18ac33c1e4eaf8370350824fb3ffce86

SHA512
80fb1425c57d7984da87349efdc0c4508296b58548e62ee4743215edd1058818154cb1207b95ec74299c7b61953f19f71c6ab0d325126efd21d8c5749ad69452

Download Submit
memory/2304-0-0x00007FFCBF2A3000-0x00007FFCBF2A5000-memory.dmp

Filesize
8KB

Download
memory/2304-1-0x0000000000BB0000-0x0000000000EF2000-memory.dmp

Filesize
3.3MB

Download
memory/2304-2-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

Filesize
10.8MB

Download
memory/2304-9-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

Filesize
10.8MB

Download
memory/3972-10-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

Filesize
10.8MB

Download
memory/3972-11-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

Filesize
10.8MB

Download
memory/3972-12-0x000000001C310000-0x000000001C360000-memory.dmp

Filesize
320KB

Download
memory/3972-13-0x000000001C420000-0x000000001C4D2000-memory.dmp

Filesize
712KB

Download
memory/3972-14-0x000000001C2E0000-0x000000001C2F2000-memory.dmp

Filesize
72KB

Download
memory/3972-15-0x000000001C3A0000-0x000000001C3DC000-memory.dmp

Filesize
240KB

Download
memory/3972-16-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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