quasar | 2ed6f46f965ff50c50cc8414b091745f36d4301e35a7a975bf9f2625b24f8326

Analysis

max time kernel
1793s
max time network
1798s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
20-05-2024 16:59

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General

Target

ClientC.exe
Size

3.1MB
MD5

60283841a32e701810a4f2d92bd992ab
SHA1

e87d9569a7d037279814a12be25665208071ab91
SHA256

2ed6f46f965ff50c50cc8414b091745f36d4301e35a7a975bf9f2625b24f8326
SHA512

4e0ba404eaa0d823d7044f76ae0bbccb78c5d607843b33859a1c5a47f852ff040c86acc02e335f7235d4848f92e2c20f329ea5c898bd7960cc356225f06c4d97
SSDEEP

49152:yvkt62XlaSFNWPjljiFa2RoUYIPqRJ6vbR3LoGd/qtTHHB72eh2NT:yv462XlaSFNWPjljiFXRoUYIPqRJ6BP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

156.57.236.38:1162

Mutex

eeb96fcd-c654-4ba2-9a84-d3d5cfa5eee3

Attributes

encryption_key
7A857EF3A3EB39AF399F1F3800FB9F842DC83C9E
install_name
Client.exe
log_directory
Logs
reconnect_delay
1
startup_key
InsertDelete
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4168-1-0x0000000000580000-0x00000000008A4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

756 Client.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

4652 schtasks.exe
4080 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

ClientC.exeClient.exe

description pid process

Token: SeDebugPrivilege 4168 ClientC.exe
Token: SeDebugPrivilege 756 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

756 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

756 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

756 Client.exe

pid	process
756	Client.exe

pid	process
4652	schtasks.exe
4080	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4168	ClientC.exe
Token: SeDebugPrivilege	756	Client.exe

pid	process
756	Client.exe

pid	process
756	Client.exe

pid	process
756	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

ClientC.exeClient.exe

description	pid	process	target process
PID 4168 wrote to memory of 4652	4168	ClientC.exe	schtasks.exe
PID 4168 wrote to memory of 4652	4168	ClientC.exe	schtasks.exe
PID 4168 wrote to memory of 756	4168	ClientC.exe	Client.exe
PID 4168 wrote to memory of 756	4168	ClientC.exe	Client.exe
PID 756 wrote to memory of 4080	756	Client.exe	schtasks.exe
PID 756 wrote to memory of 4080	756	Client.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\ClientC.exe
"C:\Users\Admin\AppData\Local\Temp\ClientC.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4168

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "InsertDelete" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4652

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.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:756

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "InsertDelete" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4080

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2324

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
60283841a32e701810a4f2d92bd992ab

SHA1
e87d9569a7d037279814a12be25665208071ab91

SHA256
2ed6f46f965ff50c50cc8414b091745f36d4301e35a7a975bf9f2625b24f8326

SHA512
4e0ba404eaa0d823d7044f76ae0bbccb78c5d607843b33859a1c5a47f852ff040c86acc02e335f7235d4848f92e2c20f329ea5c898bd7960cc356225f06c4d97

Download Submit
memory/756-10-0x00007FF95E370000-0x00007FF95EE31000-memory.dmp

Filesize
10.8MB

Download
memory/756-11-0x00007FF95E370000-0x00007FF95EE31000-memory.dmp

Filesize
10.8MB

Download
memory/756-12-0x000000001BC50000-0x000000001BCA0000-memory.dmp

Filesize
320KB

Download
memory/756-13-0x000000001BD60000-0x000000001BE12000-memory.dmp

Filesize
712KB

Download
memory/756-14-0x00007FF95E370000-0x00007FF95EE31000-memory.dmp

Filesize
10.8MB

Download
memory/4168-0-0x00007FF95E373000-0x00007FF95E375000-memory.dmp

Filesize
8KB

Download
memory/4168-1-0x0000000000580000-0x00000000008A4000-memory.dmp

Filesize
3.1MB

Download
memory/4168-2-0x00007FF95E370000-0x00007FF95EE31000-memory.dmp

Filesize
10.8MB

Download
memory/4168-9-0x00007FF95E370000-0x00007FF95EE31000-memory.dmp

Filesize
10.8MB

Download