quasar | 23b2736b81a4c1e470f4b03ce681656c43e109e73acccbcc6279589fb1b695a6

General

Target
ControlLock.exe
Size 3.1MB
Sample240630-cxd8vsselb
SHA256 23b2736b81a4c1e470f4b03ce681656c43e109e73acccbcc6279589fb1b695a6
MD5 15666ecca39a4cd909eb57e66d3401c6
SHA1 3442a7c4c5a482f1b5ba12f43da299310a323ffb
SHA512 49001f1f25cb8ce9a402a2b71c9ae46f795a798a9d7161dce7fc64aa470570503bd9ca3b8975c53ec76f190f5d54e360beb97b4cac35c038a400fc49ba04f213
SSDEEP 49152:Sv+lL26AaNeWgPhlmVqvMQ7XSKbr4FLoGvpFbTHHB72eh2NT:SvuL26AaNeWgPhlmVqkQ7XSKbr4d
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar controllock spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ControlLock

C2

73.66.246.196:4782

Mutex

39766065-e590-4bf3-8b16-5588786c4cde

Attributes

encryption_key
FF6377F726ECA29603D169F2C250624963D66B79
install_name
WindowsDefender.exe
log_directory
Logs
reconnect_delay
2000
startup_key
Windows Defender
subdirectory
Windows

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/1028-1-0x0000000001230000-0x0000000001554000-memory.dmp	family_quasar
behavioral1/files/0x0031000000015cf5-6.dat	family_quasar
behavioral1/memory/2612-9-0x0000000000EC0000-0x00000000011E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2612	WindowsDefender.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\Windows\WindowsDefender.exe	ControlLock.exe
File opened for modification	C:\Windows\system32\Windows\WindowsDefender.exe	ControlLock.exe
File opened for modification	C:\Windows\system32\Windows	ControlLock.exe
File opened for modification	C:\Windows\system32\Windows\WindowsDefender.exe	WindowsDefender.exe
File opened for modification	C:\Windows\system32\Windows	WindowsDefender.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
2212	schtasks.exe
2808	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1028	ControlLock.exe
Token: SeDebugPrivilege	2612	WindowsDefender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2612	WindowsDefender.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1028 wrote to memory of 2212	1028	ControlLock.exe	28
PID 1028 wrote to memory of 2212	1028	ControlLock.exe	28
PID 1028 wrote to memory of 2212	1028	ControlLock.exe	28
PID 1028 wrote to memory of 2612	1028	ControlLock.exe	30
PID 1028 wrote to memory of 2612	1028	ControlLock.exe	30
PID 1028 wrote to memory of 2612	1028	ControlLock.exe	30
PID 2612 wrote to memory of 2808	2612	WindowsDefender.exe	31
PID 2612 wrote to memory of 2808	2612	WindowsDefender.exe	31
PID 2612 wrote to memory of 2808	2612	WindowsDefender.exe	31

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\ControlLock.exe
"C:\Users\Admin\AppData\Local\Temp\ControlLock.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Windows\system32\Windows\WindowsDefender.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2212
- C:\Windows\system32\Windows\WindowsDefender.exe
  "C:\Windows\system32\Windows\WindowsDefender.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2612
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Windows\system32\Windows\WindowsDefender.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2808

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

WindowsDefender.exe

Path C:\Windows\System32\Windows\WindowsDefender.exe
Size 3.1MB
SHA256 23b2736b81a4c1e470f4b03ce681656c43e109e73acccbcc6279589fb1b695a6
MD5 15666ecca39a4cd909eb57e66d3401c6
SHA1 3442a7c4c5a482f1b5ba12f43da299310a323ffb
SHA512 49001f1f25cb8ce9a402a2b71c9ae46f795a798a9d7161dce7fc64aa470570503bd9ca3b8975c53ec76f190f5d54e360beb97b4cac35c038a400fc49ba04f213
SSDEEP 49152:Sv+lL26AaNeWgPhlmVqvMQ7XSKbr4FLoGvpFbTHHB72eh2NT:SvuL26AaNeWgPhlmVqkQ7XSKbr4d
MD5 SHA1 SHA512 SSDEEP

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memory/1028-0-0x000007FEF6063000-0x000007FEF6064000-memory.dmp

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memory/1028-1-0x0000000001230000-0x0000000001554000-memory.dmp

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memory/1028-2-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

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memory/1028-8-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

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memory/2612-10-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

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memory/2612-9-0x0000000000EC0000-0x00000000011E4000-memory.dmp

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memory/2612-11-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

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memory/2612-12-0x000007FEF6060000-0x000007FEF6A4C000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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