quasar | e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece

Analysis

max time kernel
126s
max time network
139s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
14/11/2024, 23:55

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General

Target

Client-built.exe
Size

502KB
MD5

9df20812514dfcb87a556a5ef71d72bc
SHA1

798340d0ab815844690c29db3e791537690b752a
SHA256

e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece
SHA512

784f850c7abfb9d8d128cfdd906f7d1856898b6ffb58d9a6e86bd1ea629f2574f683f3cd60d0defdd8eea244705f81248f55d27827271f34a26e77250be64398
SSDEEP

12288:RTEgdfYnxUjmOad344ywgmpaO+gQvcdS:SUwMAd/ywgmpaO+gQvcdS

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

192.168.56.1:4782

Mutex

0623266f-d360-4056-9f63-ed81b7a11fdf

Attributes

encryption_key
CAC47E124130EBD3A11EBA5B8DAA79439482A0B5
install_name
Broker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Broker
subdirectory
Broker

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/1268-1-0x0000000000DA0000-0x0000000000E24000-memory.dmp	family_quasar
behavioral1/files/0x000900000001755b-4.dat	family_quasar
behavioral1/memory/2396-7-0x0000000000080000-0x0000000000104000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2396	Broker.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
1652	schtasks.exe
2556	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1268	Client-built.exe
Token: SeDebugPrivilege	2396	Broker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2396	Broker.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1268 wrote to memory of 1652	1268	Client-built.exe	31
PID 1268 wrote to memory of 1652	1268	Client-built.exe	31
PID 1268 wrote to memory of 1652	1268	Client-built.exe	31
PID 1268 wrote to memory of 2396	1268	Client-built.exe	33
PID 1268 wrote to memory of 2396	1268	Client-built.exe	33
PID 1268 wrote to memory of 2396	1268	Client-built.exe	33
PID 2396 wrote to memory of 2556	2396	Broker.exe	34
PID 2396 wrote to memory of 2556	2396	Broker.exe	34
PID 2396 wrote to memory of 2556	2396	Broker.exe	34

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:1268
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Broker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1652
- C:\Users\Admin\AppData\Roaming\Broker\Broker.exe
  "C:\Users\Admin\AppData\Roaming\Broker\Broker.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2396
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Broker" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Broker\Broker.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2556

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

C:\Users\Admin\AppData\Roaming\Broker\Broker.exe

Filesize
502KB

MD5
9df20812514dfcb87a556a5ef71d72bc

SHA1
798340d0ab815844690c29db3e791537690b752a

SHA256
e352a653ea9ba91b1d3d6c3c71695c27b4c0fa0ab90ed1c23cbbd2a22b9efece

SHA512
784f850c7abfb9d8d128cfdd906f7d1856898b6ffb58d9a6e86bd1ea629f2574f683f3cd60d0defdd8eea244705f81248f55d27827271f34a26e77250be64398

Download Submit
memory/1268-0-0x000007FEF5CB3000-0x000007FEF5CB4000-memory.dmp

Filesize
4KB

Download
memory/1268-1-0x0000000000DA0000-0x0000000000E24000-memory.dmp

Filesize
528KB

Download
memory/1268-2-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/1268-9-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2396-7-0x0000000000080000-0x0000000000104000-memory.dmp

Filesize
528KB

Download
memory/2396-8-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2396-10-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download
memory/2396-11-0x000007FEF5CB0000-0x000007FEF669C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads