quasar | bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
05/12/2024, 17:35

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General

Target
bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
Size 3.4MB
Sample241205-v544csvjfz
SHA256 bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570
MD5 73fb4fbe3f3202a618aa74935779e3ac
SHA1 73c9f409c2f10ac0af8cffd3969b6b93b07768b4
SHA512 478f6a181b4f95a7d6f5c48f1a25fd88083eb18df759c89cc3227d70b12ca498447536b0bf77bc0a7c60bcd860c5f1ed2f837280bde7e41c0f078a51531b188e
SSDEEP 49152:3v7I22SsaNYfdPBldt698dBcjHuwAW1J3PoGdDTHHB72eh2NTi:3vE22SsaNYfdPBldt6+dBcjHuwAqL
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.15:4782

Mutex

400d2b6f-f5a4-4bb8-8ac1-572601b9847a

Attributes

encryption_key
28DB6A992E078CF6FE82A1042CC979D37C6466CE
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/3496-1-0x00000000007F0000-0x0000000000B56000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b82-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4020	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
2360	schtasks.exe
976	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3496	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
Token: SeDebugPrivilege	4020	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4020	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4020	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4020	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3496 wrote to memory of 2360	3496	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	82
PID 3496 wrote to memory of 2360	3496	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	82
PID 3496 wrote to memory of 4020	3496	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	84
PID 3496 wrote to memory of 4020	3496	bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe	84
PID 4020 wrote to memory of 976	4020	Client.exe	85
PID 4020 wrote to memory of 976	4020	Client.exe	85

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\bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe
"C:\Users\Admin\AppData\Local\Temp\bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3496
- 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⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2360
- 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
  - Suspicious use of WriteProcessMemory
  PID:4020
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:976

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 3.4MB
SHA256 bc9a8ff70146de10ad5f822120c9abee2dd1f1e93f69038cbbd9dc574dae2570
MD5 73fb4fbe3f3202a618aa74935779e3ac
SHA1 73c9f409c2f10ac0af8cffd3969b6b93b07768b4
SHA512 478f6a181b4f95a7d6f5c48f1a25fd88083eb18df759c89cc3227d70b12ca498447536b0bf77bc0a7c60bcd860c5f1ed2f837280bde7e41c0f078a51531b188e
SSDEEP 49152:3v7I22SsaNYfdPBldt698dBcjHuwAW1J3PoGdDTHHB72eh2NTi:3vE22SsaNYfdPBldt6+dBcjHuwAqL
MD5 SHA1 SHA512 SSDEEP

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memory/3496-0-0x00007FFB85243000-0x00007FFB85245000-memory.dmp

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memory/3496-1-0x00000000007F0000-0x0000000000B56000-memory.dmp

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memory/3496-2-0x00007FFB85240000-0x00007FFB85D01000-memory.dmp

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memory/3496-10-0x00007FFB85240000-0x00007FFB85D01000-memory.dmp

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memory/4020-9-0x00007FFB85240000-0x00007FFB85D01000-memory.dmp

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memory/4020-11-0x00007FFB85240000-0x00007FFB85D01000-memory.dmp

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memory/4020-12-0x0000000002760000-0x00000000027B0000-memory.dmp

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memory/4020-13-0x000000001D1B0000-0x000000001D262000-memory.dmp

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memory/4020-14-0x00007FFB85240000-0x00007FFB85D01000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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