quasar | 4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e

General

Target

4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.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

C2

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/3472-1-0x0000000000220000-0x0000000000544000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c93-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1128	winboot.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\bootufi\winboot.exe	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
File opened for modification	C:\Windows\system32\bootufi\winboot.exe	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
File opened for modification	C:\Windows\system32\bootufi	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
File opened for modification	C:\Windows\system32\bootufi\winboot.exe	winboot.exe
File opened for modification	C:\Windows\system32\bootufi	winboot.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
2908	schtasks.exe
4036	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3472	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
Token: SeDebugPrivilege	1128	winboot.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3472 wrote to memory of 2908	3472	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	83
PID 3472 wrote to memory of 2908	3472	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	83
PID 3472 wrote to memory of 1128	3472	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	85
PID 3472 wrote to memory of 1128	3472	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	85
PID 1128 wrote to memory of 4036	1128	winboot.exe	86
PID 1128 wrote to memory of 4036	1128	winboot.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\4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
"C:\Users\Admin\AppData\Local\Temp\4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3472
- 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:2908
- 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:1128
- - 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:4036

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

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/1128-10-0x00007FF940390000-0x00007FF940E51000-memory.dmp

Filesize
10.8MB

Download
memory/1128-11-0x00007FF940390000-0x00007FF940E51000-memory.dmp

Filesize
10.8MB

Download
memory/1128-12-0x000000001C0A0000-0x000000001C0F0000-memory.dmp

Filesize
320KB

Download
memory/1128-13-0x000000001C1B0000-0x000000001C262000-memory.dmp

Filesize
712KB

Download
memory/1128-17-0x000000001C130000-0x000000001C16C000-memory.dmp

Filesize
240KB

Download
memory/1128-16-0x000000001C080000-0x000000001C092000-memory.dmp

Filesize
72KB

Download
memory/1128-18-0x00007FF940390000-0x00007FF940E51000-memory.dmp

Filesize
10.8MB

Download
memory/3472-0-0x00007FF940393000-0x00007FF940395000-memory.dmp

Filesize
8KB

Download
memory/3472-1-0x0000000000220000-0x0000000000544000-memory.dmp

Filesize
3.1MB

Download
memory/3472-2-0x00007FF940390000-0x00007FF940E51000-memory.dmp

Filesize
10.8MB

Download
memory/3472-9-0x00007FF940390000-0x00007FF940E51000-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