quasar | a1c8c48ee50425a76c78a1fc0dce9ca76f3ac4ea36e5a7f8ec553e5a348f88a0

General

Target

WindowsDefender.exe
Size

3.3MB
MD5

1448aa339fc327144c92d9ab75f67dc0
SHA1

59a0f2ae25765dd3201b34967807ef3512b8dd96
SHA256

a1c8c48ee50425a76c78a1fc0dce9ca76f3ac4ea36e5a7f8ec553e5a348f88a0
SHA512

918c0bbb6c0359d3c180a5dcee661d18ebf909d7d65e6795d55c7abbdcade5cb10f3d39d709195b345324656bcc7d1952852203e35db577cd8ff55df19d33775
SSDEEP

49152:WvDhBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkaxxOEMkxk/JxCoGdWKTHHB72eh2NT:Wvbt2d5aKCuVPzlEmVQ0wvwfxxcwG

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

general-later.gl.at.ply.gg:6227

Mutex

e8e985a7-62a2-410d-91ea-7249972738eb

Attributes

encryption_key
578EFB451288E8CFFF8CB67C63A1530F061DDBCD
install_name
WindowsDefender.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows.Defender.exe
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/5032-1-0x00000000003A0000-0x00000000006EE000-memory.dmp	family_quasar
behavioral1/files/0x001e00000002aa8c-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1904	WindowsDefender.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
2640	schtasks.exe
1516	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5032	WindowsDefender.exe
Token: SeDebugPrivilege	1904	WindowsDefender.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1904	WindowsDefender.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1904	WindowsDefender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1904	WindowsDefender.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5032 wrote to memory of 2640	5032	WindowsDefender.exe	80
PID 5032 wrote to memory of 2640	5032	WindowsDefender.exe	80
PID 5032 wrote to memory of 1904	5032	WindowsDefender.exe	82
PID 5032 wrote to memory of 1904	5032	WindowsDefender.exe	82
PID 1904 wrote to memory of 1516	1904	WindowsDefender.exe	83
PID 1904 wrote to memory of 1516	1904	WindowsDefender.exe	83

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\WindowsDefender.exe
"C:\Users\Admin\AppData\Local\Temp\WindowsDefender.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5032
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows.Defender.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WindowsDefender.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2640
- C:\Users\Admin\AppData\Roaming\SubDir\WindowsDefender.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\WindowsDefender.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1904
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows.Defender.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\WindowsDefender.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1516

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:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\WindowsDefender.exe.log

Filesize
1KB

MD5
b4e91d2e5f40d5e2586a86cf3bb4df24

SHA1
31920b3a41aa4400d4a0230a7622848789b38672

SHA256
5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

SHA512
968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\WindowsDefender.exe

Filesize
3.3MB

MD5
1448aa339fc327144c92d9ab75f67dc0

SHA1
59a0f2ae25765dd3201b34967807ef3512b8dd96

SHA256
a1c8c48ee50425a76c78a1fc0dce9ca76f3ac4ea36e5a7f8ec553e5a348f88a0

SHA512
918c0bbb6c0359d3c180a5dcee661d18ebf909d7d65e6795d55c7abbdcade5cb10f3d39d709195b345324656bcc7d1952852203e35db577cd8ff55df19d33775

Download Submit
memory/1904-10-0x00007FFB23870000-0x00007FFB24332000-memory.dmp

Filesize
10.8MB

Download
memory/1904-11-0x00007FFB23870000-0x00007FFB24332000-memory.dmp

Filesize
10.8MB

Download
memory/1904-12-0x000000001C840000-0x000000001C890000-memory.dmp

Filesize
320KB

Download
memory/1904-13-0x000000001C950000-0x000000001CA02000-memory.dmp

Filesize
712KB

Download
memory/1904-14-0x00007FFB23870000-0x00007FFB24332000-memory.dmp

Filesize
10.8MB

Download
memory/1904-15-0x000000001D040000-0x000000001D568000-memory.dmp

Filesize
5.2MB

Download
memory/5032-0-0x00007FFB23873000-0x00007FFB23875000-memory.dmp

Filesize
8KB

Download
memory/5032-1-0x00000000003A0000-0x00000000006EE000-memory.dmp

Filesize
3.3MB

Download
memory/5032-2-0x00007FFB23870000-0x00007FFB24332000-memory.dmp

Filesize
10.8MB

Download
memory/5032-9-0x00007FFB23870000-0x00007FFB24332000-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