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 3 IoCs

resource	yara_rule
behavioral1/memory/1712-1-0x0000000000050000-0x0000000000374000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016cc9-6.dat	family_quasar
behavioral1/memory/2360-9-0x0000000001140000-0x0000000001464000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2360	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
484	schtasks.exe
2776	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe
Token: SeDebugPrivilege	2360	winboot.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 484	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	31
PID 1712 wrote to memory of 484	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	31
PID 1712 wrote to memory of 484	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	31
PID 1712 wrote to memory of 2360	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	33
PID 1712 wrote to memory of 2360	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	33
PID 1712 wrote to memory of 2360	1712	4c15728c688fd0ef27d2effeb6e37f8b05f104dc07da04926b8e0386b5e58a0e.exe	33
PID 2360 wrote to memory of 2776	2360	winboot.exe	34
PID 2360 wrote to memory of 2776	2360	winboot.exe	34
PID 2360 wrote to memory of 2776	2360	winboot.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\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:1712
- 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:484
- 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:2360
- - 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:2776

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/1712-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

Filesize
4KB

Download
memory/1712-1-0x0000000000050000-0x0000000000374000-memory.dmp

Filesize
3.1MB

Download
memory/1712-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/1712-10-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-8-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-9-0x0000000001140000-0x0000000001464000-memory.dmp

Filesize
3.1MB

Download
memory/2360-11-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-12-0x000007FEF6080000-0x000007FEF6A6C000-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