quasar | c999d6136409e5ef4c8f74135da6ca63993a3a0695ecaa83195904ba5a76b6e1

General

Target
76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe
Size 3.1MB
Sample240623-ej1aaasgql
SHA256 76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61
MD5 fd87b46407dcd7e3dfa77dcd37573100
SHA1 3bd0a9a9c262ab4fb7fc9a9debcf36fd882f59cc
SHA512 960a79aa64032c47eba2b8078e44cfe76e4de70c4ba44052f7d41ec4a494b74a5a101c614030fa0643f97cfc2582b9743574b6c4373ad32be04fdee20da0a6e7
SSDEEP 49152:ovXI22SsaNYfdPBldt698dBcjHZ8P3v5ZUoGdFTHHB72eh2NT:ovY22SsaNYfdPBldt6+dBcjHZ8Pg
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar 1.0 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

1.0

C2

speedhacker.online:4782

Mutex

bc8a4e37-672d-4bb3-ba74-c2cd7fc44e08

Attributes

encryption_key
49BF5A48970D914C7E70F494A8E16B5EFA3AB6A0
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4168-1-0x0000000000950000-0x0000000000C7A000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023522-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5028	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.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
2960	schtasks.exe
1624	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4168	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe
Token: SeDebugPrivilege	5028	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5028	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4168 wrote to memory of 2960	4168	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe	88
PID 4168 wrote to memory of 2960	4168	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe	88
PID 4168 wrote to memory of 5028	4168	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe	90
PID 4168 wrote to memory of 5028	4168	76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe	90
PID 5028 wrote to memory of 1624	5028	Client.exe	91
PID 5028 wrote to memory of 1624	5028	Client.exe	91

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\76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe
"C:\Users\Admin\AppData\Local\Temp\76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4168
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2960
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5028
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1624

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4080,i,1999448010053300448,1112699187621658374,262144 --variations-seed-version --mojo-platform-channel-handle=3976 /prefetch:8
1⤵
PID:4068

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

Client.exe

Path C:\Windows\System32\SubDir\Client.exe
Size 3.1MB
SHA256 76f06975c4f0772d68e2a30d8e0c62b1f8c484e2ce7b0979c63c4cf519a40b61
MD5 fd87b46407dcd7e3dfa77dcd37573100
SHA1 3bd0a9a9c262ab4fb7fc9a9debcf36fd882f59cc
SHA512 960a79aa64032c47eba2b8078e44cfe76e4de70c4ba44052f7d41ec4a494b74a5a101c614030fa0643f97cfc2582b9743574b6c4373ad32be04fdee20da0a6e7
SSDEEP 49152:ovXI22SsaNYfdPBldt698dBcjHZ8P3v5ZUoGdFTHHB72eh2NT:ovY22SsaNYfdPBldt6+dBcjHZ8Pg
MD5 SHA1 SHA512 SSDEEP

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memory/4168-0-0x00007FFFE6243000-0x00007FFFE6245000-memory.dmp

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memory/4168-1-0x0000000000950000-0x0000000000C7A000-memory.dmp

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memory/4168-2-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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memory/4168-10-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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memory/5028-9-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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memory/5028-11-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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memory/5028-12-0x000000001BE70000-0x000000001BEC0000-memory.dmp

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memory/5028-13-0x000000001BF80000-0x000000001C032000-memory.dmp

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memory/5028-14-0x00007FFFE6240000-0x00007FFFE6D01000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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