quasar | 19dabea0bfc499b562a1b82579ff46dd5310403cde90110d64476e6303d518e1

Analysis

max time kernel
149s
max time network
151s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250128-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250128-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
01-02-2025 16:29

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General

Target

Client-built.exe
Size

3.1MB
MD5

a7bfdffa0b5f88f5b16081746cd6f73a
SHA1

3d31a0e592821f99735ad1677062290e1d38e648
SHA256

19dabea0bfc499b562a1b82579ff46dd5310403cde90110d64476e6303d518e1
SHA512

a30ee81e07463684753d884ea5da1098507d5ba972d9f6354d001c7bcf8c611930740482698330cad985ede11da82aeb120b07606368e5dadb805cd32cd660b0
SSDEEP

49152:rvqI22SsaNYfdPBldt698dBcjHPCi1JnLoGdtTHHB72eh2NT:rvH22SsaNYfdPBldt6+dBcjHPCy

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

127.0.0.1:35221

Mutex

58393935-dd6f-401f-8b46-cb2948abc20e

Attributes

encryption_key
E7E8DC90EA655C9B08C3C5B00196CA0322A2C8C3
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/2176-1-0x00000000008F0000-0x0000000000C14000-memory.dmp	family_quasar
behavioral1/files/0x000b000000027ca7-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3480	Client.exe

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File created	C:\Program Files\SubDir\Client.exe	Client-built.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	2176	Client-built.exe
Token: SeDebugPrivilege	3480	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3480	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3480	Client.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 2176 wrote to memory of 3480	2176	Client-built.exe	79
PID 2176 wrote to memory of 3480	2176	Client-built.exe	79

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2176
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  PID:3480

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
a7bfdffa0b5f88f5b16081746cd6f73a

SHA1
3d31a0e592821f99735ad1677062290e1d38e648

SHA256
19dabea0bfc499b562a1b82579ff46dd5310403cde90110d64476e6303d518e1

SHA512
a30ee81e07463684753d884ea5da1098507d5ba972d9f6354d001c7bcf8c611930740482698330cad985ede11da82aeb120b07606368e5dadb805cd32cd660b0

Download Submit
memory/2176-0-0x00007FFAEBD63000-0x00007FFAEBD65000-memory.dmp

Filesize
8KB

Download
memory/2176-1-0x00000000008F0000-0x0000000000C14000-memory.dmp

Filesize
3.1MB

Download
memory/2176-2-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download
memory/2176-6-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download
memory/3480-5-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download
memory/3480-7-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download
memory/3480-8-0x000000001D0F0000-0x000000001D140000-memory.dmp

Filesize
320KB

Download
memory/3480-9-0x000000001D200000-0x000000001D2B2000-memory.dmp

Filesize
712KB

Download
memory/3480-10-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download
memory/3480-11-0x00007FFAEBD60000-0x00007FFAEC822000-memory.dmp

Filesize
10.8MB

Download