quasar | 8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c

Analysis

max time kernel
153s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
08/01/2024, 11:59

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General

Target
Client.exe
Size 3.1MB
Sample240108-n5vflaabh2
SHA256 8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c
MD5 6f293272df899a043acbf788caf81c1c
SHA1 b560917bf5c67c37eb646acc9880c5a80620fce5
SHA512 2bd856adf50ed0459049b981303a376e7a3ecb24e68c16b6302d86c9af0fb9c705dc302a038a138fe0f2c331d86e9c45b67d3938a6b6b855ccb4d8f6c5eea835
SSDEEP 49152:fvjI22SsaNYfdPBldt698dBcjHrnRJ6lbR3koGdXRTHHB72eh2NT:fvc22SsaNYfdPBldt6+dBcjHrnRJ6g
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

s4.v100.vip:27923

Mutex

d5414082-4cab-4589-99bb-7dd47fd5eb64

Attributes

encryption_key
18854790AF8AC5E8BF1537F60123BF3CEB9A5B09
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 payload 2 IoCs

resource	yara_rule
behavioral2/memory/4976-0-0x0000000000630000-0x0000000000954000-memory.dmp	family_quasar
behavioral2/files/0x0003000000022764-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3912	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
1936	schtasks.exe
1472	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4976	Client.exe
Token: SeDebugPrivilege	3912	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3912	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4976 wrote to memory of 1936	4976	Client.exe	66
PID 4976 wrote to memory of 1936	4976	Client.exe	66
PID 4976 wrote to memory of 3912	4976	Client.exe	69
PID 4976 wrote to memory of 3912	4976	Client.exe	69
PID 3912 wrote to memory of 1472	3912	Client.exe	92
PID 3912 wrote to memory of 1472	3912	Client.exe	92

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4976
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1936
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3912
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1472

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Client.exe.log
Size 1KB
SHA256 ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924
MD5 baf55b95da4a601229647f25dad12878
SHA1 abc16954ebfd213733c4493fc1910164d825cac8
SHA512 24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545
MD5 SHA1 SHA512

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Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 92KB
SHA256 6a345b8019c0d9f3783addf793ac867781ca0990e1a7b29f32db90d970934bca
MD5 379dba3ccd9f0cf1bbf0be8e4c0f5b17
SHA1 a627b49c6a4c44df8c38e1814c9e73f2256479c2
SHA512 20e6f85d2a174182834561c1effefea008d0aedc4d66efe49fbaef67b928064768e825e78a171e6f755082b2b3661ed20bdc39bf4e493392771f5f46a2ccc899
SSDEEP 1536:H3dUXMFQ52gM44KMExpltMnx2Mzi0LM0wDjJOmzTLicwfg575Qh3DED:KcFQ52gMzKMeFMnVrwDdpzTOxfg5y3D2
MD5 SHA1 SHA512 SSDEEP

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memory/3912-11-0x000000001B560000-0x000000001B570000-memory.dmp

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memory/3912-9-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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memory/3912-12-0x0000000002AA0000-0x0000000002AF0000-memory.dmp

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memory/3912-13-0x000000001BC30000-0x000000001BCE2000-memory.dmp

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memory/3912-14-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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memory/3912-15-0x000000001B560000-0x000000001B570000-memory.dmp

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memory/4976-0-0x0000000000630000-0x0000000000954000-memory.dmp

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memory/4976-2-0x000000001B780000-0x000000001B790000-memory.dmp

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memory/4976-1-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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memory/4976-10-0x00007FF9D39A0000-0x00007FF9D4461000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads