quasar | 57da36748503ef806ae7bc812dc416dea9d97747dc50749d61fa7f835b85db1e

Analysis

max time kernel
150s
max time network
145s
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 00:00

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General

Target

Client-built.exe
Size

3.1MB
MD5

3da9b1a1a9bc8d62b14a16f61d9b0d79
SHA1

7a83070e35994f8ec7afed51577df75ba1bbfdb0
SHA256

57da36748503ef806ae7bc812dc416dea9d97747dc50749d61fa7f835b85db1e
SHA512

e83e0742c0ec0da2be36ecf81072891ba4e4f22f5f8fb10d73534250db63c8233678c0c0d1980960f4f05997476da1135e0427270c512f7c5f8e848263004a03
SSDEEP

49152:DvnI22SsaNYfdPBldt698dBcjHU9RJ6ibR3LoGdJTHHB72eh2NT:DvI22SsaNYfdPBldt6+dBcjHU9RJ6c

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.41:4782

Mutex

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

Attributes

encryption_key
6A865538EA2172CEA230F0158FFB3F9E7FC36141
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/3360-1-0x00000000006A0000-0x00000000009C4000-memory.dmp	family_quasar
behavioral1/files/0x002800000004504b-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1932	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	3360	Client-built.exe
Token: SeDebugPrivilege	1932	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1932	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1932	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1932	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 3360 wrote to memory of 1932	3360	Client-built.exe	80
PID 3360 wrote to memory of 1932	3360	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:3360
- 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:1932

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
3da9b1a1a9bc8d62b14a16f61d9b0d79

SHA1
7a83070e35994f8ec7afed51577df75ba1bbfdb0

SHA256
57da36748503ef806ae7bc812dc416dea9d97747dc50749d61fa7f835b85db1e

SHA512
e83e0742c0ec0da2be36ecf81072891ba4e4f22f5f8fb10d73534250db63c8233678c0c0d1980960f4f05997476da1135e0427270c512f7c5f8e848263004a03

Download Submit
memory/1932-6-0x00007FFF5E8B0000-0x00007FFF5F372000-memory.dmp

Filesize
10.8MB

Download
memory/1932-7-0x00007FFF5E8B0000-0x00007FFF5F372000-memory.dmp

Filesize
10.8MB

Download
memory/1932-8-0x000000001E430000-0x000000001E480000-memory.dmp

Filesize
320KB

Download
memory/1932-9-0x000000001E540000-0x000000001E5F2000-memory.dmp

Filesize
712KB

Download
memory/1932-10-0x00007FFF5E8B0000-0x00007FFF5F372000-memory.dmp

Filesize
10.8MB

Download
memory/3360-0-0x00007FFF5E8B3000-0x00007FFF5E8B5000-memory.dmp

Filesize
8KB

Download
memory/3360-1-0x00000000006A0000-0x00000000009C4000-memory.dmp

Filesize
3.1MB

Download
memory/3360-2-0x00007FFF5E8B0000-0x00007FFF5F372000-memory.dmp

Filesize
10.8MB

Download
memory/3360-5-0x00007FFF5E8B0000-0x00007FFF5F372000-memory.dmp

Filesize
10.8MB

Download