quasar | 48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01

Analysis

max time kernel
39s
max time network
52s
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 19:01

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General

Target

Client-built.exe
Size

3.1MB
MD5

f5b93af3ee1b64dacd2bac9ba4af9b27
SHA1

1f2a038199a71a2b917dca4dff2f5fac5e840978
SHA256

48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01
SHA512

83703b0f567723abe3d6b34bd419be5df3475e049ae8893993fec017da9a420cd875184c570bdffbfc0bccac662762991885dea8ebcc2af172b3aac2fb00a302
SSDEEP

49152:mv2I22SsaNYfdPBldt698dBcjHQzRJ6TbR3LoGd/oobTHHB72eh2NT:mvb22SsaNYfdPBldt6+dBcjHQzRJ6FA

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/4536-1-0x0000000000220000-0x0000000000544000-memory.dmp	family_quasar
behavioral1/files/0x0029000000045142-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
1156	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
2432	schtasks.exe
2936	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	4536	Client-built.exe
Token: SeDebugPrivilege	1156	Client.exe

Suspicious use of FindShellTrayWindow 3 IoCs

Processes:

Client.exe

pid	Process
1156	Client.exe
1156	Client.exe
1156	Client.exe

Suspicious use of SendNotifyMessage 3 IoCs

Processes:

Client.exe

pid	Process
1156	Client.exe
1156	Client.exe
1156	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	Process	procid_target
PID 4536 wrote to memory of 2432	4536	Client-built.exe	83
PID 4536 wrote to memory of 2432	4536	Client-built.exe	83
PID 4536 wrote to memory of 1156	4536	Client-built.exe	85
PID 4536 wrote to memory of 1156	4536	Client-built.exe	85
PID 1156 wrote to memory of 2936	1156	Client.exe	86
PID 1156 wrote to memory of 2936	1156	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4536
- 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:2432
- 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:1156
- - 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:2936

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
f5b93af3ee1b64dacd2bac9ba4af9b27

SHA1
1f2a038199a71a2b917dca4dff2f5fac5e840978

SHA256
48d4fde21b28f0614fdf124f83f5594bddc13292f21b775da58b017385a49b01

SHA512
83703b0f567723abe3d6b34bd419be5df3475e049ae8893993fec017da9a420cd875184c570bdffbfc0bccac662762991885dea8ebcc2af172b3aac2fb00a302

Download Submit
memory/1156-5-0x00007FFFA6AF0000-0x00007FFFA75B2000-memory.dmp

Filesize
10.8MB

Download
memory/1156-7-0x00007FFFA6AF0000-0x00007FFFA75B2000-memory.dmp

Filesize
10.8MB

Download
memory/1156-8-0x000000001CCB0000-0x000000001CD00000-memory.dmp

Filesize
320KB

Download
memory/1156-9-0x000000001CDC0000-0x000000001CE72000-memory.dmp

Filesize
712KB

Download
memory/1156-12-0x000000001CD00000-0x000000001CD12000-memory.dmp

Filesize
72KB

Download
memory/1156-13-0x000000001CD60000-0x000000001CD9C000-memory.dmp

Filesize
240KB

Download
memory/1156-14-0x00007FFFA6AF0000-0x00007FFFA75B2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-0-0x00007FFFA6AF3000-0x00007FFFA6AF5000-memory.dmp

Filesize
8KB

Download
memory/4536-1-0x0000000000220000-0x0000000000544000-memory.dmp

Filesize
3.1MB

Download
memory/4536-2-0x00007FFFA6AF0000-0x00007FFFA75B2000-memory.dmp

Filesize
10.8MB

Download
memory/4536-6-0x00007FFFA6AF0000-0x00007FFFA75B2000-memory.dmp

Filesize
10.8MB

Download