quasar | dd3a0e96a5f0c33c48c6ff2147abf15e6be49172e7bf6c582005331224c59fda

Analysis

max time kernel
136s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
16/07/2024, 09:06

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General

Target

Client-built.exe
Size

3.1MB
MD5

d9a4c8f06b7b0426d6e67a43ddb5b118
SHA1

8bd62ef23e1de76f9b0a09a6168af0037bef8026
SHA256

dd3a0e96a5f0c33c48c6ff2147abf15e6be49172e7bf6c582005331224c59fda
SHA512

ea6fb24eb746a6fdb4be2e38a193ae221a86454d999ecd24cd9500041ac1774f8e38275199c02979079baa94b840669617138c36b9965a8f61406e98ea8faedb
SSDEEP

49152:uvkt62XlaSFNWPjljiFa2RoUYIyzhkbRjPLoGdCTHHB72eh2NT:uv462XlaSFNWPjljiFXRoUYIyzhsT

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.112.130:4444

Mutex

524f4736-b434-4f1b-87d4-60efee95f1a0

Attributes

encryption_key
FD2C72B7511C4796A615A71C40CAA513DD1F1A24
install_name
Byfron.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Byfron
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/4180-1-0x00000000006A0000-0x00000000009C4000-memory.dmp	family_quasar
behavioral1/files/0x0009000000023437-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5072	Byfron.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
884	schtasks.exe
4328	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4180	Client-built.exe
Token: SeDebugPrivilege	5072	Byfron.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5072	Byfron.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4180 wrote to memory of 884	4180	Client-built.exe	86
PID 4180 wrote to memory of 884	4180	Client-built.exe	86
PID 4180 wrote to memory of 5072	4180	Client-built.exe	88
PID 4180 wrote to memory of 5072	4180	Client-built.exe	88
PID 5072 wrote to memory of 4328	5072	Byfron.exe	89
PID 5072 wrote to memory of 4328	5072	Byfron.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:4180
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Byfron" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Byfron.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:884
- C:\Users\Admin\AppData\Roaming\SubDir\Byfron.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Byfron.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5072
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Byfron" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Byfron.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4328

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
d9a4c8f06b7b0426d6e67a43ddb5b118

SHA1
8bd62ef23e1de76f9b0a09a6168af0037bef8026

SHA256
dd3a0e96a5f0c33c48c6ff2147abf15e6be49172e7bf6c582005331224c59fda

SHA512
ea6fb24eb746a6fdb4be2e38a193ae221a86454d999ecd24cd9500041ac1774f8e38275199c02979079baa94b840669617138c36b9965a8f61406e98ea8faedb

Download Submit
memory/4180-0-0x00007FFE959F3000-0x00007FFE959F5000-memory.dmp

Filesize
8KB

Download
memory/4180-1-0x00000000006A0000-0x00000000009C4000-memory.dmp

Filesize
3.1MB

Download
memory/4180-2-0x00007FFE959F0000-0x00007FFE964B1000-memory.dmp

Filesize
10.8MB

Download
memory/4180-9-0x00007FFE959F0000-0x00007FFE964B1000-memory.dmp

Filesize
10.8MB

Download
memory/5072-10-0x00007FFE959F0000-0x00007FFE964B1000-memory.dmp

Filesize
10.8MB

Download
memory/5072-11-0x00007FFE959F0000-0x00007FFE964B1000-memory.dmp

Filesize
10.8MB

Download
memory/5072-12-0x000000001B0F0000-0x000000001B140000-memory.dmp

Filesize
320KB

Download
memory/5072-13-0x000000001B850000-0x000000001B902000-memory.dmp

Filesize
712KB

Download
memory/5072-14-0x00007FFE959F0000-0x00007FFE964B1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads