quasar | 54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd

Analysis

max time kernel
98s
max time network
143s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
03-11-2024 17:27

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General

Target

Client-built.exe
Size

3.1MB
MD5

3a96e758409eeabc8836a8665980e01b
SHA1

50f6950089a997ccdac2c0790f4745bb84792a32
SHA256

54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd
SHA512

f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8
SSDEEP

49152:Sv2I22SsaNYfdPBldt698dBcjHgNxNESEbk/iOLoGdbTHHB72eh2NT:Svb22SsaNYfdPBldt6+dBcjHCxqw

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/1504-1-0x0000000000500000-0x0000000000824000-memory.dmp	family_quasar
behavioral1/files/0x00280000000450c0-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
2092	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
4736	schtasks.exe
3684	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	1504	Client-built.exe
Token: SeDebugPrivilege	2092	Client.exe

Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Client.exe

pid	Process
2092	Client.exe
2092	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Client.exe

pid	Process
2092	Client.exe
2092	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process	procid_target
PID 1504 wrote to memory of 4736	1504	Client-built.exe	84
PID 1504 wrote to memory of 4736	1504	Client-built.exe	84
PID 1504 wrote to memory of 2092	1504	Client-built.exe	86
PID 1504 wrote to memory of 2092	1504	Client-built.exe	86
PID 2092 wrote to memory of 3684	2092	Client.exe	89
PID 2092 wrote to memory of 3684	2092	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1504
- 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:4736
- 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 WriteProcessMemory
  PID:2092
- - 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:3684

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
3a96e758409eeabc8836a8665980e01b

SHA1
50f6950089a997ccdac2c0790f4745bb84792a32

SHA256
54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd

SHA512
f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8

Download Submit
memory/1504-0-0x00007FFA34CD3000-0x00007FFA34CD5000-memory.dmp

Filesize
8KB

Download
memory/1504-1-0x0000000000500000-0x0000000000824000-memory.dmp

Filesize
3.1MB

Download
memory/1504-2-0x00007FFA34CD0000-0x00007FFA35792000-memory.dmp

Filesize
10.8MB

Download
memory/1504-5-0x00007FFA34CD0000-0x00007FFA35792000-memory.dmp

Filesize
10.8MB

Download
memory/2092-6-0x00007FFA34CD0000-0x00007FFA35792000-memory.dmp

Filesize
10.8MB

Download
memory/2092-7-0x00007FFA34CD0000-0x00007FFA35792000-memory.dmp

Filesize
10.8MB

Download
memory/2092-8-0x000000001C590000-0x000000001C5E0000-memory.dmp

Filesize
320KB

Download
memory/2092-9-0x000000001C6A0000-0x000000001C752000-memory.dmp

Filesize
712KB

Download
memory/2092-12-0x000000001C5E0000-0x000000001C5F2000-memory.dmp

Filesize
72KB

Download
memory/2092-13-0x000000001C640000-0x000000001C67C000-memory.dmp

Filesize
240KB

Download
memory/2092-14-0x00007FFA34CD0000-0x00007FFA35792000-memory.dmp

Filesize
10.8MB

Download