quasar | 204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65

Analysis

max time kernel
130s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
04/07/2024, 06:08

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General

Target
204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe
Size 3.1MB
Sample240704-gv76dazgla
SHA256 204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65
MD5 be300aead5cd8e32fc9dd20fd9e7705c
SHA1 06a78475e21027d024464579e01a30ef1f87ef6c
SHA512 c342ba8a16308ecc0a2d1351ef37540586852535fd525cf25006fb9e68614fda006b8fce5ee872ebee082a722cdb479b8e61c88d09e2d7c0efaa212978fe264c
SSDEEP 49152:Wvkt62XlaSFNWPjljiFa2RoUYI1URJ6ObR3LoGdZTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYI1URJ6I
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

172.20.10.2:4782

Mutex

58c9d7ce-367b-46ee-a0dd-70acadaa8502

Attributes

encryption_key
7D391C6FD1226D3B96AFC080317CBD4D6C3E6AFB
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows stereo
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/1164-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023450-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2372	Client.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
3744	schtasks.exe
4512	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1164	204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe
Token: SeDebugPrivilege	2372	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2372	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1164 wrote to memory of 3744	1164	204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe	86
PID 1164 wrote to memory of 3744	1164	204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe	86
PID 1164 wrote to memory of 2372	1164	204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe	88
PID 1164 wrote to memory of 2372	1164	204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe	88
PID 2372 wrote to memory of 4512	2372	Client.exe	89
PID 2372 wrote to memory of 4512	2372	Client.exe	89

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\204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe
"C:\Users\Admin\AppData\Local\Temp\204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1164
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows stereo" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3744
- 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:2372
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows stereo" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4512

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Client.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Size 3.1MB
SHA256 204a88d4a5da2b21a7282fcd548be2fed1ab02f297ac2f2483ffa6bf38c01f65
MD5 be300aead5cd8e32fc9dd20fd9e7705c
SHA1 06a78475e21027d024464579e01a30ef1f87ef6c
SHA512 c342ba8a16308ecc0a2d1351ef37540586852535fd525cf25006fb9e68614fda006b8fce5ee872ebee082a722cdb479b8e61c88d09e2d7c0efaa212978fe264c
SSDEEP 49152:Wvkt62XlaSFNWPjljiFa2RoUYI1URJ6ObR3LoGdZTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYI1URJ6I
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1164-0-0x00007FFA95043000-0x00007FFA95045000-memory.dmp

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memory/1164-1-0x0000000000C90000-0x0000000000FB4000-memory.dmp

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memory/1164-2-0x00007FFA95040000-0x00007FFA95B01000-memory.dmp

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memory/1164-9-0x00007FFA95040000-0x00007FFA95B01000-memory.dmp

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memory/2372-10-0x00007FFA95040000-0x00007FFA95B01000-memory.dmp

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memory/2372-11-0x00007FFA95040000-0x00007FFA95B01000-memory.dmp

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memory/2372-12-0x000000001AEA0000-0x000000001AEF0000-memory.dmp

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memory/2372-13-0x000000001B840000-0x000000001B8F2000-memory.dmp

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memory/2372-14-0x00007FFA95040000-0x00007FFA95B01000-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