quasar | d465ae9ae6e31167882d3b174e65fb3147ead1574d6cade606a3aa4ae0c5545c

Analysis

max time kernel
135s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230221-en
resource tags

arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
submitted
06-06-2023 15:37

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General

Target

03765899.exe
Size

3.1MB
MD5

3b09070c9e87a592744c37b11da765ec
SHA1

7cc3c47a526bdff236c386d7104e6a6421105c68
SHA256

d465ae9ae6e31167882d3b174e65fb3147ead1574d6cade606a3aa4ae0c5545c
SHA512

cb74601a94f6756af762b13955f60b52f508dac2d5b80b7394377b9113c908dee1f578cc1bdf7e18a9cbb742c9fb69565506cf59ec273af4913b77adc9242365
SSDEEP

98304:vI/4IIbtPUwyah7/l9jr18zR7CP+FxSh:Qybta7CPyk

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

146.56.36.222:4782

Mutex

bab74252-734a-4e03-933a-2f4f1e18953d

Attributes

encryption_key
F48794CF898BB4C5B6223D4F472D7C5E4AD2EF9D
install_name
yu.exe
log_directory
Logs
reconnect_delay
3000
startup_key
zhudongfangyu
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2724-133-0x0000000000380000-0x00000000006A4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\yu.exe	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\yu.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

yu.exe

pid process

4508 yu.exe
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
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1844 schtasks.exe
4484 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

03765899.exeyu.exe

description pid process

Token: SeDebugPrivilege 2724 03765899.exe
Token: SeDebugPrivilege 4508 yu.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

yu.exe

pid process

4508 yu.exe

pid	process
4508	yu.exe

pid	process
1844	schtasks.exe
4484	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2724	03765899.exe
Token: SeDebugPrivilege	4508	yu.exe

pid	process
4508	yu.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

03765899.exeyu.exe

description	pid	process	target process
PID 2724 wrote to memory of 1844	2724	03765899.exe	schtasks.exe
PID 2724 wrote to memory of 1844	2724	03765899.exe	schtasks.exe
PID 2724 wrote to memory of 4508	2724	03765899.exe	yu.exe
PID 2724 wrote to memory of 4508	2724	03765899.exe	yu.exe
PID 4508 wrote to memory of 4484	4508	yu.exe	schtasks.exe
PID 4508 wrote to memory of 4484	4508	yu.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\03765899.exe
"C:\Users\Admin\AppData\Local\Temp\03765899.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2724

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "zhudongfangyu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\yu.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1844

C:\Users\Admin\AppData\Roaming\SubDir\yu.exe
"C:\Users\Admin\AppData\Roaming\SubDir\yu.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4508

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "zhudongfangyu" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\yu.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:4484

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

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

MD5
3b09070c9e87a592744c37b11da765ec

SHA1
7cc3c47a526bdff236c386d7104e6a6421105c68

SHA256
d465ae9ae6e31167882d3b174e65fb3147ead1574d6cade606a3aa4ae0c5545c

SHA512
cb74601a94f6756af762b13955f60b52f508dac2d5b80b7394377b9113c908dee1f578cc1bdf7e18a9cbb742c9fb69565506cf59ec273af4913b77adc9242365

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\yu.exe
Filesize
3.1MB

MD5
3b09070c9e87a592744c37b11da765ec

SHA1
7cc3c47a526bdff236c386d7104e6a6421105c68

SHA256
d465ae9ae6e31167882d3b174e65fb3147ead1574d6cade606a3aa4ae0c5545c

SHA512
cb74601a94f6756af762b13955f60b52f508dac2d5b80b7394377b9113c908dee1f578cc1bdf7e18a9cbb742c9fb69565506cf59ec273af4913b77adc9242365

Download Submit
memory/2724-133-0x0000000000380000-0x00000000006A4000-memory.dmp

Filesize
3.1MB

Download
memory/2724-134-0x000000001B450000-0x000000001B460000-memory.dmp

Filesize
64KB

Download
memory/4508-141-0x000000001BA00000-0x000000001BA10000-memory.dmp

Filesize
64KB

Download
memory/4508-142-0x000000001B9B0000-0x000000001BA00000-memory.dmp

Filesize
320KB

Download
memory/4508-143-0x000000001C1C0000-0x000000001C272000-memory.dmp

Filesize
712KB

Download
memory/4508-146-0x0000000002FB0000-0x0000000002FC2000-memory.dmp

Filesize
72KB

Download
memory/4508-147-0x000000001C140000-0x000000001C17C000-memory.dmp

Filesize
240KB

Download
memory/4508-148-0x000000001BA00000-0x000000001BA10000-memory.dmp

Filesize
64KB

Download