quasar | 043bd9f70265da014b6ca98126748570265db535b8105d5ef9ee5b9d4064c9ed

Analysis

max time kernel
142s
max time network
144s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250113-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
20-01-2025 00:24

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General

Target

Client-built.exe
Size

3.1MB
MD5

bb394e24cefb7def4a58be7a086c1b6e
SHA1

ca0ee7eb98f7f3fac0dbb64178e8bbdb6a85688e
SHA256

043bd9f70265da014b6ca98126748570265db535b8105d5ef9ee5b9d4064c9ed
SHA512

4acab7609b1ccbaf5a37e3239db135c350edad82caefa28f46dbbcf68ba002b9ca42765f96e7df7899c9a29e6f570f20c1a1455ddd0b3ac5f2a3017f9dbf02db
SSDEEP

49152:DvzlL26AaNeWgPhlmVqvMQ7XSKixRJ6fbR3LoGdctTHHB72eh2NT:DvpL26AaNeWgPhlmVqkQ7XSKixRJ6x

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.169:4782

Mutex

d1633e8d-888a-4785-b591-7ddec8df31a6

Attributes

encryption_key
E2C0A8DE00F91C56BBD30BD99E29F3EB6F0E59DB
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/1560-1-0x00000000002C0000-0x00000000005E4000-memory.dmp	family_quasar
behavioral1/files/0x0028000000046139-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2344	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1560	Client-built.exe
Token: SeDebugPrivilege	2344	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1560 wrote to memory of 2344	1560	Client-built.exe	84
PID 1560 wrote to memory of 2344	1560	Client-built.exe	84

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:1560
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2344

Network

MITRE ATT&CK Matrix

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
bb394e24cefb7def4a58be7a086c1b6e

SHA1
ca0ee7eb98f7f3fac0dbb64178e8bbdb6a85688e

SHA256
043bd9f70265da014b6ca98126748570265db535b8105d5ef9ee5b9d4064c9ed

SHA512
4acab7609b1ccbaf5a37e3239db135c350edad82caefa28f46dbbcf68ba002b9ca42765f96e7df7899c9a29e6f570f20c1a1455ddd0b3ac5f2a3017f9dbf02db

Download Submit
memory/1560-0-0x00007FF934EF3000-0x00007FF934EF5000-memory.dmp

Filesize
8KB

Download
memory/1560-1-0x00000000002C0000-0x00000000005E4000-memory.dmp

Filesize
3.1MB

Download
memory/1560-2-0x00007FF934EF0000-0x00007FF9359B2000-memory.dmp

Filesize
10.8MB

Download
memory/1560-6-0x00007FF934EF0000-0x00007FF9359B2000-memory.dmp

Filesize
10.8MB

Download
memory/2344-5-0x00007FF934EF0000-0x00007FF9359B2000-memory.dmp

Filesize
10.8MB

Download
memory/2344-7-0x00007FF934EF0000-0x00007FF9359B2000-memory.dmp

Filesize
10.8MB

Download
memory/2344-8-0x0000000002AB0000-0x0000000002B00000-memory.dmp

Filesize
320KB

Download
memory/2344-9-0x000000001B700000-0x000000001B7B2000-memory.dmp

Filesize
712KB

Download
memory/2344-10-0x00007FF934EF0000-0x00007FF9359B2000-memory.dmp

Filesize
10.8MB

Download