quasar | 29238eb7d1bcf9b4e2accc0ebed96c8e26aa7a930600266167a56c5bb5ced01b

Analysis

max time kernel
128s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
28/04/2023, 16:26

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General

Target
Client-built.exe
Size 3.1MB
Sample230428-txps2ahb2w
SHA256 29238eb7d1bcf9b4e2accc0ebed96c8e26aa7a930600266167a56c5bb5ced01b
MD5 0942effdc84f5979347905ab80f21023
SHA1 0015428220b2a13ac55bdc5160216421cacf13be
SHA512 c132b2f18b9b3d26a2fbc77a387d665c09a6a6ccf2eef20cdc084b7f48446ec85eed2c607ea5d9669f1d1bab3220a06bd31ef5ef58b29f69daa43d1e112fb07f
SSDEEP 49152:rveI22SsaNYfdPBldt698dBcjHgvlRwLoGdZTHHB72eh2NT:rvT22SsaNYfdPBldt6+dBcjHGRO
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.1:4782

Mutex

1a04b7d8-24aa-4696-9677-8bf570f5918b

Attributes

encryption_key
05FB1CC1A636E3A24EF6197FB6FEAE9749D9406C
install_name
Floppa.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 3 IoCs

resource	yara_rule
behavioral2/memory/4360-133-0x0000000000730000-0x0000000000A54000-memory.dmp	family_quasar
behavioral2/files/0x000300000000073b-137.dat	family_quasar
behavioral2/files/0x000300000000073b-139.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4888	Floppa.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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

T1053

pid	Process
4012	schtasks.exe
4116	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4360	Client-built.exe
Token: SeDebugPrivilege	4888	Floppa.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4888	Floppa.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4888	Floppa.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4888	Floppa.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4360 wrote to memory of 4116	4360	Client-built.exe	84
PID 4360 wrote to memory of 4116	4360	Client-built.exe	84
PID 4360 wrote to memory of 4888	4360	Client-built.exe	85
PID 4360 wrote to memory of 4888	4360	Client-built.exe	85
PID 4888 wrote to memory of 4012	4888	Floppa.exe	88
PID 4888 wrote to memory of 4012	4888	Floppa.exe	88

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-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4360
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Floppa.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4116
- C:\Users\Admin\AppData\Roaming\SubDir\Floppa.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Floppa.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:4888
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Floppa.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4012

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Floppa.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Floppa.exe
Size 3.1MB
SHA256 29238eb7d1bcf9b4e2accc0ebed96c8e26aa7a930600266167a56c5bb5ced01b
MD5 0942effdc84f5979347905ab80f21023
SHA1 0015428220b2a13ac55bdc5160216421cacf13be
SHA512 c132b2f18b9b3d26a2fbc77a387d665c09a6a6ccf2eef20cdc084b7f48446ec85eed2c607ea5d9669f1d1bab3220a06bd31ef5ef58b29f69daa43d1e112fb07f
SSDEEP 49152:rveI22SsaNYfdPBldt698dBcjHgvlRwLoGdZTHHB72eh2NT:rvT22SsaNYfdPBldt6+dBcjHGRO
MD5 SHA1 SHA512 SSDEEP

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Floppa.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Floppa.exe
Size 3.1MB
SHA256 29238eb7d1bcf9b4e2accc0ebed96c8e26aa7a930600266167a56c5bb5ced01b
MD5 0942effdc84f5979347905ab80f21023
SHA1 0015428220b2a13ac55bdc5160216421cacf13be
SHA512 c132b2f18b9b3d26a2fbc77a387d665c09a6a6ccf2eef20cdc084b7f48446ec85eed2c607ea5d9669f1d1bab3220a06bd31ef5ef58b29f69daa43d1e112fb07f
SSDEEP 49152:rveI22SsaNYfdPBldt698dBcjHgvlRwLoGdZTHHB72eh2NT:rvT22SsaNYfdPBldt6+dBcjHGRO
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/4360-133-0x0000000000730000-0x0000000000A54000-memory.dmp

Download

memory/4360-134-0x0000000002C50000-0x0000000002C60000-memory.dmp

Download

memory/4888-140-0x000000001C7A0000-0x000000001C7B0000-memory.dmp

Download

memory/4888-141-0x000000001D630000-0x000000001D680000-memory.dmp

Download

memory/4888-142-0x000000001D740000-0x000000001D7F2000-memory.dmp

Download

memory/4888-143-0x000000001C7A0000-0x000000001C7B0000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads