quasar | 540a815a873aae037d0cb5bc5a9b8288acd6d83024860d79923f695dd379f22f

Analysis

max time kernel
149s
max time network
120s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
28-06-2024 06:30

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General

Target

Client-built.exe
Size

3.1MB
MD5

32bb0a34ec761b84719ba4e23bb812e7
SHA1

a9bb8d3418ac232997b54961d640922606ffe734
SHA256

540a815a873aae037d0cb5bc5a9b8288acd6d83024860d79923f695dd379f22f
SHA512

9264a68fb34069b759298baf1d0ec708133bf9b00caf3aec99e2e7a787c099948aa9c2469bc01c12d24d3323f5fcbc26ab8abc34ff4ad0bb90e500db67adba87
SSDEEP

49152:KvEt62XlaSFNWPjljiFa2RoUYIzFitmtMfDBoGdmWTHHB72eh2NT:KvY62XlaSFNWPjljiFXRoUYIzFitm+

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

127.0.0.1:29643

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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2212-1-0x0000000001260000-0x0000000001584000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\system.exe	family_quasar
behavioral1/memory/3060-9-0x0000000000C70000-0x0000000000F94000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

system.exe

pid process

3060 system.exe

pid	process
3060	system.exe

Drops file in System32 directory 5 IoCs

Processes:

Client-built.exesystem.exe

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

2100 schtasks.exe
2688 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exesystem.exe

description pid process

Token: SeDebugPrivilege 2212 Client-built.exe
Token: SeDebugPrivilege 3060 system.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

system.exe

pid process

3060 system.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

system.exe

pid process

3060 system.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

system.exe

pid process

3060 system.exe

pid	process
2100	schtasks.exe
2688	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2212	Client-built.exe
Token: SeDebugPrivilege	3060	system.exe

pid	process
3060	system.exe

pid	process
3060	system.exe

pid	process
3060	system.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exesystem.exe

description	pid	process	target process
PID 2212 wrote to memory of 2100	2212	Client-built.exe	schtasks.exe
PID 2212 wrote to memory of 2100	2212	Client-built.exe	schtasks.exe
PID 2212 wrote to memory of 2100	2212	Client-built.exe	schtasks.exe
PID 2212 wrote to memory of 3060	2212	Client-built.exe	system.exe
PID 2212 wrote to memory of 3060	2212	Client-built.exe	system.exe
PID 2212 wrote to memory of 3060	2212	Client-built.exe	system.exe
PID 3060 wrote to memory of 2688	3060	system.exe	schtasks.exe
PID 3060 wrote to memory of 2688	3060	system.exe	schtasks.exe
PID 3060 wrote to memory of 2688	3060	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\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:2212

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:2100

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:3060

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:2688

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

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

MD5
32bb0a34ec761b84719ba4e23bb812e7

SHA1
a9bb8d3418ac232997b54961d640922606ffe734

SHA256
540a815a873aae037d0cb5bc5a9b8288acd6d83024860d79923f695dd379f22f

SHA512
9264a68fb34069b759298baf1d0ec708133bf9b00caf3aec99e2e7a787c099948aa9c2469bc01c12d24d3323f5fcbc26ab8abc34ff4ad0bb90e500db67adba87

Download Submit
memory/2212-0-0x000007FEF5A33000-0x000007FEF5A34000-memory.dmp

Filesize
4KB

Download
memory/2212-1-0x0000000001260000-0x0000000001584000-memory.dmp

Filesize
3.1MB

Download
memory/2212-2-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

Filesize
9.9MB

Download
memory/2212-10-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-8-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-9-0x0000000000C70000-0x0000000000F94000-memory.dmp

Filesize
3.1MB

Download
memory/3060-11-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

Filesize
9.9MB

Download
memory/3060-12-0x000007FEF5A30000-0x000007FEF641C000-memory.dmp

Filesize
9.9MB

Download