quasar | 12dc2baf687f02a7df0fed338cb08d23f36a4a603ca5f79c4ac4e56a5ba513f8

General

Target

Client-built2.exe
Size

342KB
MD5

13068ff1db0fbb26129b02afe8567572
SHA1

0fe5b876286049d09c1f4dbf0259c0dac94f1a8a
SHA256

12dc2baf687f02a7df0fed338cb08d23f36a4a603ca5f79c4ac4e56a5ba513f8
SHA512

939594001ac03b07e242cbf9b98067e25eab2684d68b489d702032bfaf941f9ce37d5514cef6d57d856f1e97caf73fa666de6ee1f5604fc95c7ba8169c4cc9a3
SSDEEP

6144:f8CnG6AjVvEdTn4b12eBNwktELSSvllMr2aZn55e45N7m6NiQ+1cuAIfu:f8BIdUbjNvpXr2aTdm6NiXc7f

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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
1772	Client.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\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 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	ip-api.com
8	api.ipify.org

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
3348	schtasks.exe
4540	schtasks.exe
4304	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1392	Client-built2.exe
1392	Client-built2.exe
1392	Client-built2.exe
1392	Client-built2.exe
1392	Client-built2.exe
1772	Client.exe
1772	Client.exe
1772	Client.exe
1772	Client.exe
1772	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1392	Client-built2.exe
Token: SeDebugPrivilege	1772	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1772	Client.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1392 wrote to memory of 4540	1392	Client-built2.exe	82
PID 1392 wrote to memory of 4540	1392	Client-built2.exe	82
PID 1392 wrote to memory of 1772	1392	Client-built2.exe	84
PID 1392 wrote to memory of 1772	1392	Client-built2.exe	84
PID 1772 wrote to memory of 4304	1772	Client.exe	85
PID 1772 wrote to memory of 4304	1772	Client.exe	85
PID 1772 wrote to memory of 3348	1772	Client.exe	87
PID 1772 wrote to memory of 3348	1772	Client.exe	87

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\Client-built2.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built2.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1392
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built2.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4540
- 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 behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1772
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4304
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3348

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

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

Replay Monitor

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Downloads

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

Filesize
342KB

MD5
13068ff1db0fbb26129b02afe8567572

SHA1
0fe5b876286049d09c1f4dbf0259c0dac94f1a8a

SHA256
12dc2baf687f02a7df0fed338cb08d23f36a4a603ca5f79c4ac4e56a5ba513f8

SHA512
939594001ac03b07e242cbf9b98067e25eab2684d68b489d702032bfaf941f9ce37d5514cef6d57d856f1e97caf73fa666de6ee1f5604fc95c7ba8169c4cc9a3

Download Submit
memory/1392-0-0x00007FFFEFE53000-0x00007FFFEFE55000-memory.dmp

Filesize
8KB

Download
memory/1392-1-0x00000000004F0000-0x00000000004F8000-memory.dmp

Filesize
32KB

Download
memory/1392-2-0x0000000000DB0000-0x0000000000E4E000-memory.dmp

Filesize
632KB

Download
memory/1392-3-0x00007FFFEFE50000-0x00007FFFF0911000-memory.dmp

Filesize
10.8MB

Download
memory/1392-4-0x0000000002670000-0x0000000002682000-memory.dmp

Filesize
72KB

Download
memory/1392-5-0x00007FFFEFE53000-0x00007FFFEFE55000-memory.dmp

Filesize
8KB

Download
memory/1392-6-0x00007FFFEFE50000-0x00007FFFF0911000-memory.dmp

Filesize
10.8MB

Download
memory/1392-12-0x00007FFFEFE50000-0x00007FFFF0911000-memory.dmp

Filesize
10.8MB

Download
memory/1772-13-0x00007FFFEFE50000-0x00007FFFF0911000-memory.dmp

Filesize
10.8MB

Download
memory/1772-14-0x00007FFFEFE50000-0x00007FFFF0911000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads