quasar | b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f

Analysis

max time kernel
145s
max time network
149s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
04-11-2024 00:31

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General

Target

Fps unlocker.exe
Size

3.1MB
MD5

bf656c2e5e1e942c41fa918132faa7ab
SHA1

1c2ddd815378e54db9e21dd2e61d89067c94da4f
SHA256

b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f
SHA512

54bef34ab722d69f1d3b7f5316f1fbc10fc629bb134f70eecb6a368330b7b73305ef5fa0b9e83c104e6e679ccd1d6e7f5a20caf4f39e6b03d4940b4ed9540b7d
SSDEEP

49152:Pv2I22SsaNYfdPBldt698dBcjHDWxNESE9k/irLoGd5pTHHB72eh2NT:Pvb22SsaNYfdPBldt6+dBcjHSxw3p

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

Inversin-43597.portmap.host:43597

Mutex

80329fd2-f063-4b06-9c7e-8dbc6278c2a3

Attributes

encryption_key
744EA1A385FEBC6DA96387411B7000D77E66B075
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2544-1-0x0000000000010000-0x0000000000334000-memory.dmp	family_quasar
behavioral1/files/0x002900000004502f-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
4036	Client.exe

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

System Information Discovery
T1082

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

Processes:

schtasks.exeschtasks.exe

pid	Process
3604	schtasks.exe
1008	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

Client.exe

pid	Process
4036	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Fps unlocker.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	2544	Fps unlocker.exe
Token: SeDebugPrivilege	4036	Client.exe

Suspicious use of FindShellTrayWindow 3 IoCs

Processes:

Client.exe

pid	Process
4036	Client.exe
4036	Client.exe
4036	Client.exe

Suspicious use of SendNotifyMessage 3 IoCs

Processes:

Client.exe

pid	Process
4036	Client.exe
4036	Client.exe
4036	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Fps unlocker.exeClient.exe

description	pid	Process	procid_target
PID 2544 wrote to memory of 3604	2544	Fps unlocker.exe	83
PID 2544 wrote to memory of 3604	2544	Fps unlocker.exe	83
PID 2544 wrote to memory of 4036	2544	Fps unlocker.exe	85
PID 2544 wrote to memory of 4036	2544	Fps unlocker.exe	85
PID 4036 wrote to memory of 1008	4036	Client.exe	86
PID 4036 wrote to memory of 1008	4036	Client.exe	86

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\Fps unlocker.exe
"C:\Users\Admin\AppData\Local\Temp\Fps unlocker.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2544
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3604
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:4036
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1008

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
bf656c2e5e1e942c41fa918132faa7ab

SHA1
1c2ddd815378e54db9e21dd2e61d89067c94da4f

SHA256
b70c5aea64d75fc98a82b3c88cfecc6c2856f2a4987f4c1212c3fcf866ec9c9f

SHA512
54bef34ab722d69f1d3b7f5316f1fbc10fc629bb134f70eecb6a368330b7b73305ef5fa0b9e83c104e6e679ccd1d6e7f5a20caf4f39e6b03d4940b4ed9540b7d

Download Submit
memory/2544-0-0x00007FFB52CA3000-0x00007FFB52CA5000-memory.dmp

Filesize
8KB

Download
memory/2544-1-0x0000000000010000-0x0000000000334000-memory.dmp

Filesize
3.1MB

Download
memory/2544-2-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/2544-5-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/4036-6-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/4036-7-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download
memory/4036-8-0x000000001D0F0000-0x000000001D140000-memory.dmp

Filesize
320KB

Download
memory/4036-9-0x000000001D200000-0x000000001D2B2000-memory.dmp

Filesize
712KB

Download
memory/4036-12-0x000000001D140000-0x000000001D152000-memory.dmp

Filesize
72KB

Download
memory/4036-13-0x000000001D1A0000-0x000000001D1DC000-memory.dmp

Filesize
240KB

Download
memory/4036-14-0x00007FFB52CA0000-0x00007FFB53762000-memory.dmp

Filesize
10.8MB

Download