quasar | d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

General

Target

wf_4780.exe
Size

2.8MB
MD5

ec4951e9f2b1945815954fec161cf57a
SHA1

8e9e6857a0251a89b9c43b650344fb4f1648fa76
SHA256

d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75
SHA512

596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15
SSDEEP

49152:y/Cbs48/vm/XpRDVHFZuAzG5LfvUza32ehyfT36:y/Ob8/vm/XnDVHbs

Score

10^/10

quasar x spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

X

C2

45.141.27.208:4780

127.0.0.1:4780

Mutex

d6e77ea9-bff7-4566-b4dd-f1be3c293c5e

Attributes

encryption_key
57F667877C1FCDA6663E2FDAC6FB8CFDE3CEA957
install_name
winx.exe
log_directory
Logs
reconnect_delay
3000
startup_key
winx
subdirectory
sys

Signatures

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

Quasar payload 4 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1604-54-0x0000000000910000-0x0000000000BDA000-memory.dmp	family_quasar
C:\Windows\System32\sys\winx.exe	family_quasar
C:\Windows\system32\sys\winx.exe	family_quasar
behavioral1/memory/1396-61-0x0000000000B40000-0x0000000000E0A000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

winx.exe

pid process

1396 winx.exe

pid	process
1396	winx.exe

Drops file in System32 directory 5 IoCs

Processes:

wf_4780.exewinx.exe

description	ioc	process
File created	C:\Windows\system32\sys\winx.exe	wf_4780.exe
File opened for modification	C:\Windows\system32\sys\winx.exe	wf_4780.exe
File opened for modification	C:\Windows\system32\sys	wf_4780.exe
File opened for modification	C:\Windows\system32\sys\winx.exe	winx.exe
File opened for modification	C:\Windows\system32\sys	winx.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

1556 schtasks.exe
1524 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

wf_4780.exewinx.exe

description pid process

Token: SeDebugPrivilege 1604 wf_4780.exe
Token: SeDebugPrivilege 1396 winx.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

winx.exe

pid process

1396 winx.exe

pid	process
1556	schtasks.exe
1524	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1604	wf_4780.exe
Token: SeDebugPrivilege	1396	winx.exe

pid	process
1396	winx.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

wf_4780.exewinx.exe

description	pid	process	target process
PID 1604 wrote to memory of 1524	1604	wf_4780.exe	schtasks.exe
PID 1604 wrote to memory of 1524	1604	wf_4780.exe	schtasks.exe
PID 1604 wrote to memory of 1524	1604	wf_4780.exe	schtasks.exe
PID 1604 wrote to memory of 1396	1604	wf_4780.exe	winx.exe
PID 1604 wrote to memory of 1396	1604	wf_4780.exe	winx.exe
PID 1604 wrote to memory of 1396	1604	wf_4780.exe	winx.exe
PID 1396 wrote to memory of 1556	1396	winx.exe	schtasks.exe
PID 1396 wrote to memory of 1556	1396	winx.exe	schtasks.exe
PID 1396 wrote to memory of 1556	1396	winx.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\wf_4780.exe
"C:\Users\Admin\AppData\Local\Temp\wf_4780.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1604

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1524

C:\Windows\system32\sys\winx.exe
"C:\Windows\system32\sys\winx.exe"
2⤵
- Executes dropped EXE
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1396

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "winx" /sc ONLOGON /tr "C:\Windows\system32\sys\winx.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:1556

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Windows\System32\sys\winx.exe
Filesize
2.8MB

MD5
ec4951e9f2b1945815954fec161cf57a

SHA1
8e9e6857a0251a89b9c43b650344fb4f1648fa76

SHA256
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

SHA512
596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15

Download Submit
C:\Windows\system32\sys\winx.exe
Filesize
2.8MB

MD5
ec4951e9f2b1945815954fec161cf57a

SHA1
8e9e6857a0251a89b9c43b650344fb4f1648fa76

SHA256
d969fc2e15743d6d44f477907368f2ebc96cefba20a232861fc7337bfa938d75

SHA512
596e28d3529be33483589973ac34410f574cd888bda74e1e24afb2a2de107af4e788e2a27648da3c4fe4db4f49184244ce6ccf50f480c95c8d252d541587ad15

Download Submit
memory/1396-61-0x0000000000B40000-0x0000000000E0A000-memory.dmp

Filesize
2.8MB

Download
memory/1396-62-0x0000000000AB0000-0x0000000000B30000-memory.dmp

Filesize
512KB

Download
memory/1604-54-0x0000000000910000-0x0000000000BDA000-memory.dmp

Filesize
2.8MB

Download
memory/1604-55-0x000000001B200000-0x000000001B280000-memory.dmp

Filesize
512KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads