quasar | aff3e08b50336ce6a1cfe39c45d32d918dc6f190662aef666addb193f44d47a8

Analysis

max time kernel
149s
max time network
155s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
22/03/2025, 06:13

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General

Target

75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe
Size

502KB
MD5

8a04eeadf3aa212ad8b9ec03750598b5
SHA1

8ecd4c1b9e3f52c8cfb33785b8669d0fe12a67bd
SHA256

75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519
SHA512

e804d6b2530a1239dcd0dc51921841342def20fa97d2f64029f793321fcba343d3bf703fbf7c4e167233c219724364e1e6ca4266f806f5194cfda927f46d8dff
SSDEEP

6144:xTEgdc0YrXAGbgiIN2RSBKnaJm5xGDy5Etqk+yw4sUcEOOb8F9Z2U/iBWcTR3y:xTEgdfYbbgyaJpj4xywyepTcBWcdy

Score

10^/10

quasar office365 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

office365

192.168.0.182:4782

Mutex

247cbad3-d2c3-4911-bcea-2ba07f8a24dd

Attributes

encryption_key
B23B358E069C74D3466E9FC1110706C029AADF0D
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
behavioral2/memory/5760-1-0x0000000000B20000-0x0000000000BA4000-memory.dmp	family_quasar
behavioral2/files/0x000c00000002405a-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4624	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.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	5760	75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe
Token: SeDebugPrivilege	4624	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4624	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4624	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 5760 wrote to memory of 4624	5760	75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe	89
PID 5760 wrote to memory of 4624	5760	75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe	89

C:\Users\Admin\AppData\Local\Temp\75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe
"C:\Users\Admin\AppData\Local\Temp\75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5760
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:4624

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:\Windows\system32\SubDir\Client.exe

Filesize
502KB

MD5
8a04eeadf3aa212ad8b9ec03750598b5

SHA1
8ecd4c1b9e3f52c8cfb33785b8669d0fe12a67bd

SHA256
75e5b5dd81e4e1cc6623f32b322c79ef80d65a2383afa33a45db6e9e75b8d519

SHA512
e804d6b2530a1239dcd0dc51921841342def20fa97d2f64029f793321fcba343d3bf703fbf7c4e167233c219724364e1e6ca4266f806f5194cfda927f46d8dff

Download Submit
memory/4624-8-0x00007FFD5F410000-0x00007FFD5FED1000-memory.dmp

Filesize
10.8MB

Download
memory/4624-10-0x00007FFD5F410000-0x00007FFD5FED1000-memory.dmp

Filesize
10.8MB

Download
memory/4624-11-0x000000001C540000-0x000000001C590000-memory.dmp

Filesize
320KB

Download
memory/4624-12-0x000000001C650000-0x000000001C702000-memory.dmp

Filesize
712KB

Download
memory/4624-13-0x00007FFD5F410000-0x00007FFD5FED1000-memory.dmp

Filesize
10.8MB

Download
memory/5760-0-0x00007FFD5F413000-0x00007FFD5F415000-memory.dmp

Filesize
8KB

Download
memory/5760-1-0x0000000000B20000-0x0000000000BA4000-memory.dmp

Filesize
528KB

Download
memory/5760-2-0x00007FFD5F410000-0x00007FFD5FED1000-memory.dmp

Filesize
10.8MB

Download
memory/5760-9-0x00007FFD5F410000-0x00007FFD5FED1000-memory.dmp

Filesize
10.8MB

Download