quasar | e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5

Reason

Machine shutdown

General

Target

Client-built.exe
Size

3.1MB
MD5

e3c2d0b1836b0a0986bbda8072796ab0
SHA1

3ba54aca2acaa078d11e189e0b9e5cf3f57ddfb9
SHA256

e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5
SHA512

17fb83710814884d9a510c6e60708bf5d7981e461af4b0238520941218af92545d4b2719eefb384d745a06262f67ddc376901aecedf85a3802e61183cef27fc0
SSDEEP

49152:aveI22SsaNYfdPBldt698dBcjHTs1QG0+gvJ2yoGdBTHHB72eh2NT:avT22SsaNYfdPBldt6+dBcjHgg+M

Score

10^/10

quasar dilly spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

dilly

C2

lvke-45989.portmap.host:45989

Mutex

0cb49dc2-fd0d-4581-ae1e-04154c41f310

Attributes

encryption_key
E5250226804167CB0B1B4B0E9667D0C056694DCA
install_name
defenderx64.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender Helper
subdirectory
en

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/1620-1-0x0000000000AA0000-0x0000000000DC4000-memory.dmp	family_quasar
C:\Windows\System32\en\defenderx64.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:

defenderx64.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	defenderx64.exe

Executes dropped EXE 1 IoCs

Processes:

defenderx64.exe

pid process

3664 defenderx64.exe

pid	process
3664	defenderx64.exe

Drops file in System32 directory 2 IoCs

Processes:

Client-built.exe

description	ioc	process
File created	C:\Windows\system32\en\defenderx64.exe	Client-built.exe
File opened for modification	C:\Windows\system32\en\defenderx64.exe	Client-built.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

2332 schtasks.exe
2068 schtasks.exe

pid	process
2332	schtasks.exe
2068	schtasks.exe

Modifies data under HKEY_USERS 15 IoCs

Processes:

LogonUI.exe

description	ioc	process
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\AccentColor = "4292311040"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	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\CurrentVersion\Explorer\Accent\StartColorMenu = "4288567808"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "221"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = a6d8ff0076b9ed00429ce3000078d700005a9e000042750000264200f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	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\ColorizationColor = "3288365271"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365271"	LogonUI.exe

Suspicious behavior: LoadsDriver 6 IoCs

Processes:

pid

4
4
4
4
4
660

pid
4
4
4
4
4
660

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

Client-built.exedefenderx64.exeshutdown.exe

description	pid	process
Token: SeDebugPrivilege	1620	Client-built.exe
Token: SeDebugPrivilege	3664	defenderx64.exe
Token: SeShutdownPrivilege	1772	shutdown.exe
Token: SeRemoteShutdownPrivilege	1772	shutdown.exe

Suspicious use of FindShellTrayWindow 5 IoCs

Processes:

defenderx64.exe

pid process

3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
Suspicious use of SendNotifyMessage 5 IoCs

Processes:

defenderx64.exe

pid process

3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
3664 defenderx64.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

defenderx64.exeLogonUI.exe

pid process

3664 defenderx64.exe
4764 LogonUI.exe

pid	process
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe

pid	process
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe
3664	defenderx64.exe

pid	process
3664	defenderx64.exe
4764	LogonUI.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

Client-built.exedefenderx64.exe

description	pid	process	target process
PID 1620 wrote to memory of 2332	1620	Client-built.exe	schtasks.exe
PID 1620 wrote to memory of 2332	1620	Client-built.exe	schtasks.exe
PID 1620 wrote to memory of 3664	1620	Client-built.exe	defenderx64.exe
PID 1620 wrote to memory of 3664	1620	Client-built.exe	defenderx64.exe
PID 3664 wrote to memory of 2068	3664	defenderx64.exe	schtasks.exe
PID 3664 wrote to memory of 2068	3664	defenderx64.exe	schtasks.exe
PID 3664 wrote to memory of 1772	3664	defenderx64.exe	shutdown.exe
PID 3664 wrote to memory of 1772	3664	defenderx64.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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1620

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2332

C:\Windows\system32\en\defenderx64.exe
"C:\Windows\system32\en\defenderx64.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3664

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Windows Defender Helper" /sc ONLOGON /tr "C:\Windows\system32\en\defenderx64.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2068

C:\Windows\System32\shutdown.exe
"C:\Windows\System32\shutdown.exe" /s /t 0
3⤵
- Suspicious use of AdjustPrivilegeToken
PID:1772

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=1344 --field-trial-handle=2284,i,15722001240173834669,15048020084704567542,262144 --variations-seed-version /prefetch:8
1⤵
PID:1948

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3997055 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:4764

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Windows\System32\en\defenderx64.exe
Filesize
3.1MB

MD5
e3c2d0b1836b0a0986bbda8072796ab0

SHA1
3ba54aca2acaa078d11e189e0b9e5cf3f57ddfb9

SHA256
e51be2754c440078f3945070b08d88d18b0973ae44353376b92c9cc6136f17a5

SHA512
17fb83710814884d9a510c6e60708bf5d7981e461af4b0238520941218af92545d4b2719eefb384d745a06262f67ddc376901aecedf85a3802e61183cef27fc0

Download Submit
memory/1620-0-0x00007FF984463000-0x00007FF984465000-memory.dmp

Filesize
8KB

Download
memory/1620-1-0x0000000000AA0000-0x0000000000DC4000-memory.dmp

Filesize
3.1MB

Download
memory/1620-2-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/1620-8-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/3664-10-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/3664-9-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/3664-11-0x000000001CAB0000-0x000000001CB00000-memory.dmp

Filesize
320KB

Download
memory/3664-12-0x000000001CBC0000-0x000000001CC72000-memory.dmp

Filesize
712KB

Download
memory/3664-15-0x000000001CB40000-0x000000001CB52000-memory.dmp

Filesize
72KB

Download
memory/3664-16-0x000000001D7C0000-0x000000001D7FC000-memory.dmp

Filesize
240KB

Download
memory/3664-17-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/3664-18-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download
memory/3664-19-0x000000001F0D0000-0x000000001F5F8000-memory.dmp

Filesize
5.2MB

Download
memory/3664-23-0x00007FF984460000-0x00007FF984F21000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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