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
behavioral2/memory/4804-1-0x0000000000460000-0x00000000007B2000-memory.dmp	family_quasar
behavioral2/files/0x000c000000023bb4-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3940	SecurityHealthSystray.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
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
File created	C:\Windows\system32\SubDir\SecurityHealthSystray.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\SecurityHealthSystray.exe	Client-built.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
3312	schtasks.exe
1564	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4804	Client-built.exe
Token: SeDebugPrivilege	3940	SecurityHealthSystray.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3940	SecurityHealthSystray.exe
3940	SecurityHealthSystray.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
3940	SecurityHealthSystray.exe
3940	SecurityHealthSystray.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4804 wrote to memory of 3312	4804	Client-built.exe	82
PID 4804 wrote to memory of 3312	4804	Client-built.exe	82
PID 4804 wrote to memory of 3940	4804	Client-built.exe	84
PID 4804 wrote to memory of 3940	4804	Client-built.exe	84
PID 3940 wrote to memory of 1564	3940	SecurityHealthSystray.exe	85
PID 3940 wrote to memory of 1564	3940	SecurityHealthSystray.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\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:4804
- 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:3312
- 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:3940
- - 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:1564

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/3940-10-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

Filesize
10.8MB

Download
memory/3940-11-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

Filesize
10.8MB

Download
memory/3940-12-0x000000001B230000-0x000000001B280000-memory.dmp

Filesize
320KB

Download
memory/3940-13-0x000000001BD20000-0x000000001BDD2000-memory.dmp

Filesize
712KB

Download
memory/3940-14-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

Filesize
10.8MB

Download
memory/3940-15-0x0000000002920000-0x0000000002932000-memory.dmp

Filesize
72KB

Download
memory/3940-16-0x000000001B2D0000-0x000000001B30C000-memory.dmp

Filesize
240KB

Download
memory/4804-0-0x00007FFEF6F03000-0x00007FFEF6F05000-memory.dmp

Filesize
8KB

Download
memory/4804-1-0x0000000000460000-0x00000000007B2000-memory.dmp

Filesize
3.3MB

Download
memory/4804-2-0x00007FFEF6F00000-0x00007FFEF79C1000-memory.dmp

Filesize
10.8MB

Download
memory/4804-9-0x00007FFEF6F00000-0x00007FFEF79C1000-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