Malware Analysis Report

2024-10-23 21:28

Sample ID 240408-2dpb6aha41
Target 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
SHA256 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
Tags
quasar office04 spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002

Threat Level: Known bad

The file 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002 was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar payload

Quasar family

Quasar RAT

Detects executables containing common artifacts observed in infostealers

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Detects Windows executables referencing non-Windows User-Agents

Detects Windows executables referencing non-Windows User-Agents

Detects executables containing common artifacts observed in infostealers

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Executes dropped EXE

Unsigned PE

Uses Task Scheduler COM API

Creates scheduled task(s)

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-08 22:28

Signatures

Detects Windows executables referencing non-Windows User-Agents

Description Indicator Process Target
N/A N/A N/A N/A

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Description Indicator Process Target
N/A N/A N/A N/A

Detects executables containing common artifacts observed in infostealers

Description Indicator Process Target
N/A N/A N/A N/A

Quasar family

quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-08 22:28

Reported

2024-04-08 22:30

Platform

win7-20240221-en

Max time kernel

129s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects Windows executables referencing non-Windows User-Agents

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects executables containing common artifacts observed in infostealers

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\system32\schtasks.exe N/A
N/A N/A C:\Windows\system32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2336 wrote to memory of 2736 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Windows\system32\schtasks.exe
PID 2336 wrote to memory of 2736 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Windows\system32\schtasks.exe
PID 2336 wrote to memory of 2736 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Windows\system32\schtasks.exe
PID 2336 wrote to memory of 2132 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe
PID 2336 wrote to memory of 2132 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe
PID 2336 wrote to memory of 2132 N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe
PID 2132 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe C:\Windows\system32\schtasks.exe
PID 2132 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe C:\Windows\system32\schtasks.exe
PID 2132 wrote to memory of 2528 N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe

"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp

Files

memory/2336-0-0x00000000013B0000-0x00000000016D4000-memory.dmp

memory/2336-1-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

memory/2336-2-0x000000001B370000-0x000000001B3F0000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe

MD5 ed8542b4688d70d42d77fad98e5969b0
SHA1 808666505eeca15e9a7a15b95ff439497a9f1dcf
SHA256 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
SHA512 72fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45

memory/2336-8-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

memory/2132-10-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

memory/2132-9-0x00000000001A0000-0x00000000004C4000-memory.dmp

memory/2132-11-0x000007FEF58D0000-0x000007FEF62BC000-memory.dmp

memory/2132-12-0x000000001B3C0000-0x000000001B440000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-08 22:28

Reported

2024-04-08 22:30

Platform

win10v2004-20240226-en

Max time kernel

147s

Max time network

156s

Command Line

"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects Windows executables referencing non-Windows User-Agents

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers.

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Detects executables containing common artifacts observed in infostealers

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A
N/A N/A C:\Windows\SYSTEM32\schtasks.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe N/A

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe

"C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe

"C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 240.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
N/A 10.127.0.54:4782 tcp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
N/A 10.127.0.54:4782 tcp
US 8.8.8.8:53 159.113.53.23.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 140.71.91.104.in-addr.arpa udp
N/A 10.127.0.54:4782 tcp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
N/A 10.127.0.54:4782 tcp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
N/A 10.127.0.54:4782 tcp
N/A 10.127.0.54:4782 tcp
US 8.8.8.8:53 252.15.104.51.in-addr.arpa udp

Files

memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp

memory/1008-1-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

memory/1008-2-0x0000000002AD0000-0x0000000002AE0000-memory.dmp

C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe

MD5 ed8542b4688d70d42d77fad98e5969b0
SHA1 808666505eeca15e9a7a15b95ff439497a9f1dcf
SHA256 745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002
SHA512 72fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45

memory/4264-9-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

memory/4264-10-0x000000001BB20000-0x000000001BB30000-memory.dmp

memory/4264-11-0x000000001BA60000-0x000000001BAB0000-memory.dmp

memory/4264-12-0x000000001C2E0000-0x000000001C392000-memory.dmp

memory/1008-13-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

memory/4264-14-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

memory/4264-15-0x000000001BB20000-0x000000001BB30000-memory.dmp