quasar | 4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e

Analysis

max time kernel
96s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17-12-2024 06:37

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General

Target

nj.exe
Size

3.1MB
MD5

fd683344e5fc0a2dc8693f32ff45bf1f
SHA1

285fbe54593c2d616caecbaba986ba15cc4972ab
SHA256

4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e
SHA512

b272fe1b94e5b8a55167956d7baf1795fc1fc638cb8af12268bfc40c05a6f8dc22bbf06feb0e5c315ed327b60c6e14c11586d569612c8742ceb27f66c04caa79
SSDEEP

49152:qvVt62XlaSFNWPjljiFa2RoUYI7mcH+mZHLo0dPBNTHHB72eh2NT:qvn62XlaSFNWPjljiFXRoUYIicHBtB

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

209.145.59.89:443

Mutex

9d1a4f0d-2ea1-4330-81b0-244a91bf932c

Attributes

encryption_key
B90D9A43F7C3BF3BBA75403410E571B5F80BA7E1
install_name
winboot.exe
log_directory
Logs
reconnect_delay
5000
startup_key
UEFI boot
subdirectory
bootufi

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3832-1-0x0000000000830000-0x0000000000B54000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023cb5-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1840	winboot.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\bootufi\winboot.exe	nj.exe
File opened for modification	C:\Windows\system32\bootufi	nj.exe
File opened for modification	C:\Windows\system32\bootufi\winboot.exe	winboot.exe
File opened for modification	C:\Windows\system32\bootufi	winboot.exe
File created	C:\Windows\system32\bootufi\winboot.exe	nj.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
888	schtasks.exe
2396	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3832	nj.exe
Token: SeDebugPrivilege	1840	winboot.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3832 wrote to memory of 888	3832	nj.exe	82
PID 3832 wrote to memory of 888	3832	nj.exe	82
PID 3832 wrote to memory of 1840	3832	nj.exe	84
PID 3832 wrote to memory of 1840	3832	nj.exe	84
PID 1840 wrote to memory of 2396	1840	winboot.exe	85
PID 1840 wrote to memory of 2396	1840	winboot.exe	85

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\nj.exe
"C:\Users\Admin\AppData\Local\Temp\nj.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3832
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "UEFI boot" /sc ONLOGON /tr "C:\Windows\system32\bootufi\winboot.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:888
- C:\Windows\system32\bootufi\winboot.exe
  "C:\Windows\system32\bootufi\winboot.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1840
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "UEFI boot" /sc ONLOGON /tr "C:\Windows\system32\bootufi\winboot.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2396

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:\Windows\System32\bootufi\winboot.exe

Filesize
3.1MB

MD5
fd683344e5fc0a2dc8693f32ff45bf1f

SHA1
285fbe54593c2d616caecbaba986ba15cc4972ab

SHA256
4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e

SHA512
b272fe1b94e5b8a55167956d7baf1795fc1fc638cb8af12268bfc40c05a6f8dc22bbf06feb0e5c315ed327b60c6e14c11586d569612c8742ceb27f66c04caa79

Download Submit
memory/1840-9-0x00007FF974D60000-0x00007FF975821000-memory.dmp

Filesize
10.8MB

Download
memory/1840-11-0x00007FF974D60000-0x00007FF975821000-memory.dmp

Filesize
10.8MB

Download
memory/1840-12-0x000000001B1A0000-0x000000001B1F0000-memory.dmp

Filesize
320KB

Download
memory/1840-13-0x000000001D190000-0x000000001D242000-memory.dmp

Filesize
712KB

Download
memory/1840-16-0x000000001B210000-0x000000001B222000-memory.dmp

Filesize
72KB

Download
memory/1840-17-0x000000001D110000-0x000000001D14C000-memory.dmp

Filesize
240KB

Download
memory/1840-18-0x00007FF974D60000-0x00007FF975821000-memory.dmp

Filesize
10.8MB

Download
memory/3832-0-0x00007FF974D63000-0x00007FF974D65000-memory.dmp

Filesize
8KB

Download
memory/3832-1-0x0000000000830000-0x0000000000B54000-memory.dmp

Filesize
3.1MB

Download
memory/3832-2-0x00007FF974D60000-0x00007FF975821000-memory.dmp

Filesize
10.8MB

Download
memory/3832-10-0x00007FF974D60000-0x00007FF975821000-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