quasar | d0a07a135ae8b17bb81ee4077c05170153e674147c14a83724f3235ca2eea796

Resubmissions

20/04/2025, 19:01

250420-xpmkgsvqv8 10

19/04/2025, 13:34

250419-qvl3ksw1es 10

Analysis

max time kernel
4s
max time network
14s
platform
windows11-21h2_x64
resource
win11-20250411-en
resource tags

arch:x64arch:x86image:win11-20250411-enlocale:en-usos:windows11-21h2-x64system
submitted
20/04/2025, 19:01

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General

Target

45.exe
Size

1.9MB
MD5

092f5e85fdf2f6e23d3db09672a33f1f
SHA1

f4c1da32565c093ff05e78d4732c63ae35b9dc37
SHA256

d0a07a135ae8b17bb81ee4077c05170153e674147c14a83724f3235ca2eea796
SHA512

9c9ed4fd7b362a3a1285bc6d6c4aa6fd530910dbeb1cf7e45a3cce338effcd0b541eecb63eb6f2b34a736eb0707ca8a794a57c6bb1b7210a59777c16cb20a354
SSDEEP

24576:g1JFoVGS2eWBRwRR16zhHIPbcNK0KKm77yviUSQaZaOwI55l2S62r9exnVSnBm9:g7FB7wR2EgKKm77LrwCB6T

Score

10^/10

quasar spyware trojan

Malware Config

Extracted

Family

quasar

Attributes

encryption_key
43EB246F63BA6C5E8F1B8F576653410351E57F4E
reconnect_delay
3000

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/5376-1-0x000001A91E690000-0x000001A91E87C000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002b089-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4028	OfficeDirectory03.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\OfficeDirectory03.exe	45.exe
File opened for modification	C:\Windows\system32\SubDir\OfficeDirectory03.exe	45.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
5528	schtasks.exe
2600	schtasks.exe

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
4028	OfficeDirectory03.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5376	45.exe
Token: SeDebugPrivilege	4028	OfficeDirectory03.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4028	OfficeDirectory03.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5376 wrote to memory of 5528	5376	45.exe	78
PID 5376 wrote to memory of 5528	5376	45.exe	78
PID 5376 wrote to memory of 4028	5376	45.exe	80
PID 5376 wrote to memory of 4028	5376	45.exe	80
PID 4028 wrote to memory of 2600	4028	OfficeDirectory03.exe	81
PID 4028 wrote to memory of 2600	4028	OfficeDirectory03.exe	81

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\45.exe
"C:\Users\Admin\AppData\Local\Temp\45.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5376
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5528
- C:\Windows\system32\SubDir\OfficeDirectory03.exe
  "C:\Windows\system32\SubDir\OfficeDirectory03.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4028
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Security Update" /sc ONLOGON /tr "C:\Windows\system32\SubDir\OfficeDirectory03.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2600

C:\Windows\system32\svchost.exe
C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
1⤵
PID:396

Network

MITRE ATT&CK Enterprise v16

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\SubDir\OfficeDirectory03.exe

Filesize
1.9MB

MD5
092f5e85fdf2f6e23d3db09672a33f1f

SHA1
f4c1da32565c093ff05e78d4732c63ae35b9dc37

SHA256
d0a07a135ae8b17bb81ee4077c05170153e674147c14a83724f3235ca2eea796

SHA512
9c9ed4fd7b362a3a1285bc6d6c4aa6fd530910dbeb1cf7e45a3cce338effcd0b541eecb63eb6f2b34a736eb0707ca8a794a57c6bb1b7210a59777c16cb20a354

Download Submit
memory/4028-12-0x000001D88BF00000-0x000001D88BF12000-memory.dmp

Filesize
72KB

Download
memory/4028-14-0x000001D8A4900000-0x000001D8A4950000-memory.dmp

Filesize
320KB

Download
memory/4028-21-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download
memory/4028-20-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download
memory/4028-19-0x000001D88C0B0000-0x000001D88C0DA000-memory.dmp

Filesize
168KB

Download
memory/4028-10-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download
memory/4028-11-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download
memory/4028-18-0x000001D8A4BB0000-0x000001D8A4BFA000-memory.dmp

Filesize
296KB

Download
memory/4028-17-0x000001D8A4950000-0x000001D8A499C000-memory.dmp

Filesize
304KB

Download
memory/4028-15-0x000001D8A4C70000-0x000001D8A4D22000-memory.dmp

Filesize
712KB

Download
memory/4028-13-0x000001D88BF10000-0x000001D88BF4A000-memory.dmp

Filesize
232KB

Download
memory/4028-16-0x000001D88C060000-0x000001D88C0AE000-memory.dmp

Filesize
312KB

Download
memory/5376-2-0x000001A920460000-0x000001A92047A000-memory.dmp

Filesize
104KB

Download
memory/5376-0-0x00007FFBB7823000-0x00007FFBB7825000-memory.dmp

Filesize
8KB

Download
memory/5376-9-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download
memory/5376-1-0x000001A91E690000-0x000001A91E87C000-memory.dmp

Filesize
1.9MB

Download
memory/5376-3-0x00007FFBB7820000-0x00007FFBB82E2000-memory.dmp

Filesize
10.8MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads