quasar | 8b5341639e104df91c0dcbd5cec78286fa9b0fae7d19b637f3a11b93b48b655f

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
28-06-2024 06:33

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General

Target

Cl1ient-built.exe
Size

3.1MB
MD5

00cac0e352ee5c12911f4eb29a34deac
SHA1

1bb09225aa309fc793e1eb27faa1ff8b1ccf9e50
SHA256

8b5341639e104df91c0dcbd5cec78286fa9b0fae7d19b637f3a11b93b48b655f
SHA512

9c7c0b55e794132a0d1a624a4326e33bbeedbac18f3af984cb3f6f81b6e4d534b63de23f027436eb85fdc40c1f4d8ccf1bd991b27e6303b35c975c78a4daa839
SSDEEP

49152:PvDI22SsaNYfdPBldt698dBcjHaLPnVjoGdhHTHHB72eh2NT:Pv822SsaNYfdPBldt6+dBcjHaTntx

Score

10^/10

quasar office04 spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

amount-socket.gl.at.ply.gg:29643

Mutex

9bda9817-7d07-49e7-92d5-dcaf6b89216c

Attributes

encryption_key
31B6B433E91FDBAAD05B632B163CCF988D67E433
install_name
system.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svc
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 2 IoCs

Processes:

resource yara_rule

behavioral2/memory/5088-1-0x00000000009E0000-0x0000000000D04000-memory.dmp family_quasar
C:\Windows\System32\SubDir\system.exe family_quasar
Executes dropped EXE 1 IoCs

Processes:

system.exe

pid process

1480 system.exe
Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

resource	yara_rule
behavioral2/memory/5088-1-0x00000000009E0000-0x0000000000D04000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\system.exe	family_quasar

pid	process
1480	system.exe

Drops file in System32 directory 5 IoCs

Processes:

Cl1ient-built.exesystem.exe

description	ioc	process
File opened for modification	C:\Windows\system32\SubDir	Cl1ient-built.exe
File opened for modification	C:\Windows\system32\SubDir\system.exe	system.exe
File opened for modification	C:\Windows\system32\SubDir	system.exe
File created	C:\Windows\system32\SubDir\system.exe	Cl1ient-built.exe
File opened for modification	C:\Windows\system32\SubDir\system.exe	Cl1ient-built.exe

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

System Information Discovery
T1082
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

Processes:

schtasks.exeschtasks.exe

pid process

1736 schtasks.exe
2200 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Cl1ient-built.exesystem.exe

description pid process

Token: SeDebugPrivilege 5088 Cl1ient-built.exe
Token: SeDebugPrivilege 1480 system.exe
Suspicious use of FindShellTrayWindow 3 IoCs

Processes:

system.exe

pid process

1480 system.exe
1480 system.exe
1480 system.exe
Suspicious use of SendNotifyMessage 3 IoCs

Processes:

system.exe

pid process

1480 system.exe
1480 system.exe
1480 system.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

system.exe

pid process

1480 system.exe

pid	process
1736	schtasks.exe
2200	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	5088	Cl1ient-built.exe
Token: SeDebugPrivilege	1480	system.exe

pid	process
1480	system.exe
1480	system.exe
1480	system.exe

pid	process
1480	system.exe
1480	system.exe
1480	system.exe

pid	process
1480	system.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Cl1ient-built.exesystem.exe

description	pid	process	target process
PID 5088 wrote to memory of 1736	5088	Cl1ient-built.exe	schtasks.exe
PID 5088 wrote to memory of 1736	5088	Cl1ient-built.exe	schtasks.exe
PID 5088 wrote to memory of 1480	5088	Cl1ient-built.exe	system.exe
PID 5088 wrote to memory of 1480	5088	Cl1ient-built.exe	system.exe
PID 1480 wrote to memory of 2200	1480	system.exe	schtasks.exe
PID 1480 wrote to memory of 2200	1480	system.exe	schtasks.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\Cl1ient-built.exe
"C:\Users\Admin\AppData\Local\Temp\Cl1ient-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5088

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svc" /sc ONLOGON /tr "C:\Windows\system32\SubDir\system.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:1736

C:\Windows\system32\SubDir\system.exe
"C:\Windows\system32\SubDir\system.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1480

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "svc" /sc ONLOGON /tr "C:\Windows\system32\SubDir\system.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2200

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

C:\Windows\System32\SubDir\system.exe
Filesize
3.1MB

MD5
00cac0e352ee5c12911f4eb29a34deac

SHA1
1bb09225aa309fc793e1eb27faa1ff8b1ccf9e50

SHA256
8b5341639e104df91c0dcbd5cec78286fa9b0fae7d19b637f3a11b93b48b655f

SHA512
9c7c0b55e794132a0d1a624a4326e33bbeedbac18f3af984cb3f6f81b6e4d534b63de23f027436eb85fdc40c1f4d8ccf1bd991b27e6303b35c975c78a4daa839

Download Submit
memory/1480-11-0x000000001D9D0000-0x000000001DA20000-memory.dmp

Filesize
320KB

Download
memory/1480-10-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download
memory/1480-9-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download
memory/1480-12-0x000000001DAE0000-0x000000001DB92000-memory.dmp

Filesize
712KB

Download
memory/1480-15-0x000000001DA60000-0x000000001DA72000-memory.dmp

Filesize
72KB

Download
memory/1480-16-0x000000001E6E0000-0x000000001E71C000-memory.dmp

Filesize
240KB

Download
memory/1480-18-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download
memory/1480-19-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download
memory/5088-2-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download
memory/5088-1-0x00000000009E0000-0x0000000000D04000-memory.dmp

Filesize
3.1MB

Download
memory/5088-0-0x00007FFF5E983000-0x00007FFF5E985000-memory.dmp

Filesize
8KB

Download
memory/5088-17-0x00007FFF5E980000-0x00007FFF5F441000-memory.dmp

Filesize
10.8MB

Download