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
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

Client.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation Client.exe
Executes dropped EXE 3 IoCs

Processes:

Client.exeClient.exeClient.exe

pid process

1400 Client.exe
1344 Client.exe
4388 Client.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-3906287020-2915474608-1755617787-1000\Control Panel\International\Geo\Nation	Client.exe

pid	process
1400	Client.exe
1344	Client.exe
4388	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-1-5-21-3906287020-2915474608-1755617787-1000\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

6 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

3208 schtasks.exe
3532 schtasks.exe
1388 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exeClient.exe

description pid process

Token: SeDebugPrivilege 4740 virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
Token: SeDebugPrivilege 1400 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1400 Client.exe

flow	ioc
6	ip-api.com

pid	process
3208	schtasks.exe
3532	schtasks.exe
1388	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4740	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
Token: SeDebugPrivilege	1400	Client.exe

pid	process
1400	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exeClient.exe

description	pid	process	target process
PID 4740 wrote to memory of 3532	4740	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	schtasks.exe
PID 4740 wrote to memory of 3532	4740	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	schtasks.exe
PID 4740 wrote to memory of 1400	4740	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	Client.exe
PID 4740 wrote to memory of 1400	4740	virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe	Client.exe
PID 1400 wrote to memory of 1388	1400	Client.exe	schtasks.exe
PID 1400 wrote to memory of 1388	1400	Client.exe	schtasks.exe
PID 1400 wrote to memory of 3208	1400	Client.exe	schtasks.exe
PID 1400 wrote to memory of 3208	1400	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\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe
"C:\Users\Admin\AppData\Local\Temp\virussign.com_9599e82a8fa3a606c186e75e4d7d7100.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4740

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:3532

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Checks computer location settings
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1400

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:1388

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:3208

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
1⤵
- Executes dropped EXE
PID:1344

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
1⤵
- Executes dropped EXE
PID:4388

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

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

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log

Filesize
1KB

MD5
2362dcc9d262d0969898b143fb7fc91a

SHA1
2240860a675c86425f5702b501eac121bfb744eb

SHA256
4f7cff601d97caf1e0040bc2d63ccadd27294b2e551ff4167e0b080c69a915b0

SHA512
59cb7e53dc9cc02f25216cc87115403ed67fb5d24947ef2e803cd54e9f118d5d65a71817b05642c238ca48eb7bfd228d008d92e42023f2c15755c64c88f5b0d6

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
340KB

MD5
9599e82a8fa3a606c186e75e4d7d7100

SHA1
ea31dacbcba204026017a13e43f867c4cf0c4690

SHA256
f4dc1a032d33002bd859c3cad82dc31ffed0ce62c29fb899860a37b1d7dcfcbc

SHA512
126354727846d252d856ededee7aabb66442c0f29cb945735391f9a26657f1d682cdd0745672b5801cae039f8e13d573849b51ed2998b801976330df81d0194d

Download Submit
memory/1400-17-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/1400-16-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/1400-14-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/1400-12-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/4740-3-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/4740-5-0x000000001C7D0000-0x000000001C80C000-memory.dmp

Filesize
240KB

Download
memory/4740-4-0x000000001C2F0000-0x000000001C302000-memory.dmp

Filesize
72KB

Download
memory/4740-13-0x00007FF8CC1D0000-0x00007FF8CCC91000-memory.dmp

Filesize
10.8MB

Download
memory/4740-0-0x0000000000CF0000-0x0000000000CF8000-memory.dmp

Filesize
32KB

Download
memory/4740-2-0x0000000002DC0000-0x0000000002E5E000-memory.dmp

Filesize
632KB

Download
memory/4740-1-0x00007FF8CC1D3000-0x00007FF8CC1D5000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads