quasar | dcda7ad82a917a329939789f9a8514e7afa205d208c3af9356988cb1fe1f596d

Analysis

max time kernel
131s
max time network
151s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
10-12-2024 00:03

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General

Target

Client-built.exe
Size

3.1MB
MD5

dd2a6038c221bd8c0cbef5f6cab1a2dd
SHA1

1be55e1b91c69cc24187bb736ee999c36116a8f8
SHA256

dcda7ad82a917a329939789f9a8514e7afa205d208c3af9356988cb1fe1f596d
SHA512

2dd8e63c67876817b415ce62c85390a08cc8dbbc04d5b96301d497d36605737c6f6b03d6481930b5e08089e67739ba57e0e739344e3c75d3b45d9b5df56c0cfd
SSDEEP

49152:Dv7I22SsaNYfdPBldt698dBcjHq/RJ6GbR3LoGdSUTHHB72eh2NT:DvE22SsaNYfdPBldt6+dBcjHq/RJ6A

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

68.8.112.15:443

Mutex

68c72d56-7c01-4752-8b16-99645c1898fc

Attributes

encryption_key
6A865538EA2172CEA230F0158FFB3F9E7FC36141
install_name
Client.exe
log_directory
Logs
reconnect_delay
5
startup_key
Quasar Client Startup
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/3660-1-0x0000000000990000-0x0000000000CB4000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045071-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
900	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3660	Client-built.exe
Token: SeDebugPrivilege	900	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
900	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
900	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
900	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3660 wrote to memory of 900	3660	Client-built.exe	80
PID 3660 wrote to memory of 900	3660	Client-built.exe	80

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3660
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  PID:900

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
dd2a6038c221bd8c0cbef5f6cab1a2dd

SHA1
1be55e1b91c69cc24187bb736ee999c36116a8f8

SHA256
dcda7ad82a917a329939789f9a8514e7afa205d208c3af9356988cb1fe1f596d

SHA512
2dd8e63c67876817b415ce62c85390a08cc8dbbc04d5b96301d497d36605737c6f6b03d6481930b5e08089e67739ba57e0e739344e3c75d3b45d9b5df56c0cfd

Download Submit
memory/900-6-0x00007FFF848C0000-0x00007FFF85382000-memory.dmp

Filesize
10.8MB

Download
memory/900-7-0x00007FFF848C0000-0x00007FFF85382000-memory.dmp

Filesize
10.8MB

Download
memory/900-8-0x000000001C550000-0x000000001C5A0000-memory.dmp

Filesize
320KB

Download
memory/900-9-0x000000001C660000-0x000000001C712000-memory.dmp

Filesize
712KB

Download
memory/900-10-0x00007FFF848C0000-0x00007FFF85382000-memory.dmp

Filesize
10.8MB

Download
memory/3660-0-0x00007FFF848C3000-0x00007FFF848C5000-memory.dmp

Filesize
8KB

Download
memory/3660-1-0x0000000000990000-0x0000000000CB4000-memory.dmp

Filesize
3.1MB

Download
memory/3660-2-0x00007FFF848C0000-0x00007FFF85382000-memory.dmp

Filesize
10.8MB

Download
memory/3660-5-0x00007FFF848C0000-0x00007FFF85382000-memory.dmp

Filesize
10.8MB

Download