quasar | a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead

General

Target

ScreenSync.exe
Size

3.1MB
MD5

30fbaed202420d9498bdb13c9693d80e
SHA1

b38397ae8616f9776fb2af4c64691c4b63a26e7b
SHA256

a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead
SHA512

9ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d
SSDEEP

49152:2vBt62XlaSFNWPjljiFa2RoUYIzp5rbR4jLoGdlTHHB72eh2NT:2vr62XlaSFNWPjljiFXRoUYIzp5mv

Score

10^/10

quasar leo spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Leo

C2

192.168.0.17:4200

Mutex

c93cab56-a846-47c9-8b65-82599c60a04c

Attributes

encryption_key
9D84316EB0C7F33BAF79572A6CB80DCB88C8D3CF
install_name
ScreenSync.exe
log_directory
Logs
reconnect_delay
3000
startup_key
system32.exe
subdirectory
drivers

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1472-1-0x0000000000020000-0x0000000000344000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b53-6.dat	family_quasar

Drops file in Drivers directory 3 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\ScreenSync.exe	ScreenSync.exe
File created	C:\Windows\system32\drivers\ScreenSync.exe	ScreenSync.exe
File opened for modification	C:\Windows\system32\drivers\ScreenSync.exe	ScreenSync.exe

Executes dropped EXE 1 IoCs

pid	Process
2284	ScreenSync.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers	ScreenSync.exe
File opened for modification	C:\Windows\system32\drivers	ScreenSync.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3216	schtasks.exe
4284	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1472	ScreenSync.exe
Token: SeDebugPrivilege	2284	ScreenSync.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2284	ScreenSync.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1472 wrote to memory of 3216	1472	ScreenSync.exe	82
PID 1472 wrote to memory of 3216	1472	ScreenSync.exe	82
PID 1472 wrote to memory of 2284	1472	ScreenSync.exe	84
PID 1472 wrote to memory of 2284	1472	ScreenSync.exe	84
PID 2284 wrote to memory of 4284	2284	ScreenSync.exe	85
PID 2284 wrote to memory of 4284	2284	ScreenSync.exe	85

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\ScreenSync.exe
"C:\Users\Admin\AppData\Local\Temp\ScreenSync.exe"
1⤵
- Drops file in Drivers directory
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1472
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3216
- C:\Windows\system32\drivers\ScreenSync.exe
  "C:\Windows\system32\drivers\ScreenSync.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2284
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "system32.exe" /sc ONLOGON /tr "C:\Windows\system32\drivers\ScreenSync.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4284

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
1KB

MD5
baf55b95da4a601229647f25dad12878

SHA1
abc16954ebfd213733c4493fc1910164d825cac8

SHA256
ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

SHA512
24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

Download Submit
C:\Windows\System32\drivers\ScreenSync.exe

Filesize
3.1MB

MD5
30fbaed202420d9498bdb13c9693d80e

SHA1
b38397ae8616f9776fb2af4c64691c4b63a26e7b

SHA256
a9e0b5f143ba105d47ce71cc4a3a28efc689415f402620c8f021ca06bf6b5ead

SHA512
9ff1f624174a90b4aeb648f11a92fd3baa5fd1f9c70f6ef5a9c55338fae83d8427206ae514fb9acae0156f1e6dfc2c0472be591ab7ff1fa0a6119edbd55b6f3d

Download Submit
memory/1472-0-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

Filesize
8KB

Download
memory/1472-1-0x0000000000020000-0x0000000000344000-memory.dmp

Filesize
3.1MB

Download
memory/1472-2-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1472-10-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/2284-11-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/2284-12-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/2284-13-0x000000001BC20000-0x000000001BC70000-memory.dmp

Filesize
320KB

Download
memory/2284-14-0x000000001BD30000-0x000000001BDE2000-memory.dmp

Filesize
712KB

Download
memory/2284-15-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads