quasar | 151e2900f743156d22c24cd82f3ea1b8027d2e4d5f13fb2588113fa5e02b81e5

General

Target

Client-built.exe
Size

3.3MB
MD5

73391479ada904ff9341ad5dd398d7d5
SHA1

a70fc4abda717d3e6847d888eb35a8de925a54c7
SHA256

151e2900f743156d22c24cd82f3ea1b8027d2e4d5f13fb2588113fa5e02b81e5
SHA512

b15add9e1b09307c14014f1f8702bd0e5a47c7537fd480f8587d319e42718e791a68ff47fceae2a6a2083de9b92d590c5742000c07f0716cdf50e8b34ff9ac06
SSDEEP

49152:hvflL26AaNeWgPhlmVqvMQ7XSK4cGkBewXojda5qTHHB72eh2NTG:hvtL26AaNeWgPhlmVqkQ7XSKvGM

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

45.200.148.155:6060

Mutex

4b3820e0-d123-49d9-b51e-3c4daa4f6874

Attributes

encryption_key
F8879E9B26846C57C99B6F152F74703E1CC15B8B
install_name
SecurityHealthSystray.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SecurityHealthSystray.exe
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/4592-1-0x0000000000070000-0x00000000003C2000-memory.dmp	family_quasar
behavioral1/files/0x000b000000023b7a-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3912	SecurityHealthSystray.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\SecurityHealthSystray.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\SecurityHealthSystray.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\SecurityHealthSystray.exe	SecurityHealthSystray.exe
File opened for modification	C:\Windows\system32\SubDir	SecurityHealthSystray.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
3548	schtasks.exe
4860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4592	Client-built.exe
Token: SeDebugPrivilege	3912	SecurityHealthSystray.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3912	SecurityHealthSystray.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3912	SecurityHealthSystray.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4592 wrote to memory of 4860	4592	Client-built.exe	83
PID 4592 wrote to memory of 4860	4592	Client-built.exe	83
PID 4592 wrote to memory of 3912	4592	Client-built.exe	85
PID 4592 wrote to memory of 3912	4592	Client-built.exe	85
PID 3912 wrote to memory of 3548	3912	SecurityHealthSystray.exe	86
PID 3912 wrote to memory of 3548	3912	SecurityHealthSystray.exe	86

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-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4592
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "SecurityHealthSystray.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SecurityHealthSystray.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4860
- C:\Windows\system32\SubDir\SecurityHealthSystray.exe
  "C:\Windows\system32\SubDir\SecurityHealthSystray.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:3912
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "SecurityHealthSystray.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\SecurityHealthSystray.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3548

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:\Windows\System32\SubDir\SecurityHealthSystray.exe

Filesize
3.3MB

MD5
73391479ada904ff9341ad5dd398d7d5

SHA1
a70fc4abda717d3e6847d888eb35a8de925a54c7

SHA256
151e2900f743156d22c24cd82f3ea1b8027d2e4d5f13fb2588113fa5e02b81e5

SHA512
b15add9e1b09307c14014f1f8702bd0e5a47c7537fd480f8587d319e42718e791a68ff47fceae2a6a2083de9b92d590c5742000c07f0716cdf50e8b34ff9ac06

Download Submit
memory/3912-9-0x00007FFEC6140000-0x00007FFEC6C01000-memory.dmp

Filesize
10.8MB

Download
memory/3912-11-0x00007FFEC6140000-0x00007FFEC6C01000-memory.dmp

Filesize
10.8MB

Download
memory/3912-12-0x000000001D100000-0x000000001D150000-memory.dmp

Filesize
320KB

Download
memory/3912-13-0x000000001D210000-0x000000001D2C2000-memory.dmp

Filesize
712KB

Download
memory/3912-14-0x00007FFEC6140000-0x00007FFEC6C01000-memory.dmp

Filesize
10.8MB

Download
memory/4592-0-0x00007FFEC6143000-0x00007FFEC6145000-memory.dmp

Filesize
8KB

Download
memory/4592-1-0x0000000000070000-0x00000000003C2000-memory.dmp

Filesize
3.3MB

Download
memory/4592-2-0x00007FFEC6140000-0x00007FFEC6C01000-memory.dmp

Filesize
10.8MB

Download
memory/4592-10-0x00007FFEC6140000-0x00007FFEC6C01000-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