quasar | 3db4c27d5ca67cd992ef57773d7042eb53574dbe7d8e34c9cde2a42e0405953c

Analysis

max time kernel
150s
max time network
135s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
02-07-2024 15:11

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General

Target

Client-built.exe
Size

3.1MB
MD5

975c6ed39d682835148dfd77146c2243
SHA1

5b097d147810624dafb34a98e96acd734c2705b6
SHA256

3db4c27d5ca67cd992ef57773d7042eb53574dbe7d8e34c9cde2a42e0405953c
SHA512

f25038ac9f8714a7a89e0a2be58207754f6ed66feeb6e0d46dc49b2cffdb10f678f32cda3947de70f88b45033c9baa0c14c72ef406ab3ede051b9501471d5b29
SSDEEP

49152:HvilL26AaNeWgPhlmVqvMQ7XSKYPVxNESEhk/i7LoGdYJTHHB72eh2NT:HvaL26AaNeWgPhlmVqkQ7XSKSxQH

Score

10^/10

quasar solara spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Solara

192.168.0.23:4782

192.168.56.1:4782

Mutex

1db1cfc2-0b96-4b9e-afd9-8208e6abd265

Attributes

encryption_key
41AD0502F025DD3F47720DC4BDEED540F3EAFD12
install_name
securekerneI.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Update
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/2056-1-0x0000000000C80000-0x0000000000FA4000-memory.dmp	family_quasar
C:\Windows\System32\SubDir\securekerneI.exe	family_quasar
behavioral1/memory/1724-9-0x0000000000070000-0x0000000000394000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

securekerneI.exe

pid process

1724 securekerneI.exe
Drops file in System32 directory 2 IoCs

Processes:

Client-built.exe

description ioc process

File created C:\Windows\system32\SubDir\securekerneI.exe Client-built.exe
File opened for modification C:\Windows\system32\SubDir\securekerneI.exe Client-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

2904 schtasks.exe
2608 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exesecurekerneI.exe

description pid process

Token: SeDebugPrivilege 2056 Client-built.exe
Token: SeDebugPrivilege 1724 securekerneI.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

securekerneI.exe

pid process

1724 securekerneI.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

securekerneI.exe

pid process

1724 securekerneI.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

securekerneI.exe

pid process

1724 securekerneI.exe

pid	process
1724	securekerneI.exe

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

pid	process
2904	schtasks.exe
2608	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2056	Client-built.exe
Token: SeDebugPrivilege	1724	securekerneI.exe

pid	process
1724	securekerneI.exe

pid	process
1724	securekerneI.exe

pid	process
1724	securekerneI.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exesecurekerneI.exe

description	pid	process	target process
PID 2056 wrote to memory of 2904	2056	Client-built.exe	schtasks.exe
PID 2056 wrote to memory of 2904	2056	Client-built.exe	schtasks.exe
PID 2056 wrote to memory of 2904	2056	Client-built.exe	schtasks.exe
PID 2056 wrote to memory of 1724	2056	Client-built.exe	securekerneI.exe
PID 2056 wrote to memory of 1724	2056	Client-built.exe	securekerneI.exe
PID 2056 wrote to memory of 1724	2056	Client-built.exe	securekerneI.exe
PID 1724 wrote to memory of 2608	1724	securekerneI.exe	schtasks.exe
PID 1724 wrote to memory of 2608	1724	securekerneI.exe	schtasks.exe
PID 1724 wrote to memory of 2608	1724	securekerneI.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:2056

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\securekerneI.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:2904

C:\Windows\system32\SubDir\securekerneI.exe
"C:\Windows\system32\SubDir\securekerneI.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1724

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\securekerneI.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2608

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

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

MD5
975c6ed39d682835148dfd77146c2243

SHA1
5b097d147810624dafb34a98e96acd734c2705b6

SHA256
3db4c27d5ca67cd992ef57773d7042eb53574dbe7d8e34c9cde2a42e0405953c

SHA512
f25038ac9f8714a7a89e0a2be58207754f6ed66feeb6e0d46dc49b2cffdb10f678f32cda3947de70f88b45033c9baa0c14c72ef406ab3ede051b9501471d5b29

Download Submit
memory/1724-7-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/1724-9-0x0000000000070000-0x0000000000394000-memory.dmp

Filesize
3.1MB

Download
memory/1724-10-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/1724-11-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/2056-0-0x000007FEF5E93000-0x000007FEF5E94000-memory.dmp

Filesize
4KB

Download
memory/2056-1-0x0000000000C80000-0x0000000000FA4000-memory.dmp

Filesize
3.1MB

Download
memory/2056-2-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download
memory/2056-8-0x000007FEF5E90000-0x000007FEF687C000-memory.dmp

Filesize
9.9MB

Download