quasar | f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc

General

Target

virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
Size

340KB
MD5

9599e82a8fa3a606c186e75e4d7d7100
SHA1

ea31dacbcba204026017a13e43f867c4cf0c4690
SHA256

f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc
SHA512

126354727846d252d856ededee7aabb66442c0f29cb945735391f9a26657f1d682cdd0745672b5801cae039f8e13d573849b51ed2998b801976330df81d0194d
SSDEEP

6144:fDX6h8dONexs8ijaAXXQppljuz5IksclS79zStGWF3cPRRlr61ysgjIX:fDVfsxZApnjE5GcSZzpgYJr617n

Score

10^/10

quasar persistence spyware trojan

Malware Config

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Executes dropped EXE 4 IoCs

Processes:

Client.exeClient.exeClient.exeClient.exe

pid process

2500 Client.exe
928 Client.exe
1580 Client.exe
1348 Client.exe

pid	process
2500	Client.exe
928	Client.exe
1580	Client.exe
1348	Client.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Client.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Quasar Client Startup = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	Client.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

2 ip-api.com
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 3 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exeschtasks.exe

pid process

2988 schtasks.exe
2476 schtasks.exe
2400 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exeClient.exe

description pid process

Token: SeDebugPrivilege 2756 virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
Token: SeDebugPrivilege 2500 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2500 Client.exe

flow	ioc
2	ip-api.com

pid	process
2988	schtasks.exe
2476	schtasks.exe
2400	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
Token: SeDebugPrivilege	2500	Client.exe

pid	process
2500	Client.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exeClient.exetaskeng.exe

description	pid	process	target process
PID 2756 wrote to memory of 2988	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	schtasks.exe
PID 2756 wrote to memory of 2988	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	schtasks.exe
PID 2756 wrote to memory of 2988	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	schtasks.exe
PID 2756 wrote to memory of 2500	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	Client.exe
PID 2756 wrote to memory of 2500	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	Client.exe
PID 2756 wrote to memory of 2500	2756	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	Client.exe
PID 2500 wrote to memory of 2476	2500	Client.exe	schtasks.exe
PID 2500 wrote to memory of 2476	2500	Client.exe	schtasks.exe
PID 2500 wrote to memory of 2476	2500	Client.exe	schtasks.exe
PID 2500 wrote to memory of 2400	2500	Client.exe	schtasks.exe
PID 2500 wrote to memory of 2400	2500	Client.exe	schtasks.exe
PID 2500 wrote to memory of 2400	2500	Client.exe	schtasks.exe
PID 840 wrote to memory of 928	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 928	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 928	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1580	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1580	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1580	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1348	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1348	840	taskeng.exe	Client.exe
PID 840 wrote to memory of 1348	840	taskeng.exe	Client.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\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2756

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:2988

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2500

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2476

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /tn "WINDOWSSYSTEMHOST" /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /sc MINUTE /MO 1
3⤵
- Creates scheduled task(s)
PID:2400

C:\Windows\system32\taskeng.exe
taskeng.exe {8742B83A-71C8-48D2-8CB7-9D735C84FDD7} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:840

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
2⤵
- Executes dropped EXE
PID:928

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
2⤵
- Executes dropped EXE
PID:1580

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
2⤵
- Executes dropped EXE
PID:1348

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
340KB

MD5
9599e82a8fa3a606c186e75e4d7d7100

SHA1
ea31dacbcba204026017a13e43f867c4cf0c4690

SHA256
f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc

SHA512
126354727846d252d856ededee7aabb66442c0f29cb945735391f9a26657f1d682cdd0745672b5801cae039f8e13d573849b51ed2998b801976330df81d0194d

Download Submit
memory/2500-9-0x0000000000AD0000-0x0000000000AD8000-memory.dmp

Filesize
32KB

Download
memory/2500-10-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download
memory/2500-11-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download
memory/2500-14-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download
memory/2500-16-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download
memory/2756-0-0x000007FEF5753000-0x000007FEF5754000-memory.dmp

Filesize
4KB

Download
memory/2756-1-0x00000000013C0000-0x00000000013C8000-memory.dmp

Filesize
32KB

Download
memory/2756-2-0x0000000000DC0000-0x0000000000E5E000-memory.dmp

Filesize
632KB

Download
memory/2756-3-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download
memory/2756-12-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads