Malware Analysis Report

2024-10-23 21:29

Sample ID 240415-kj7bgsae25
Target HEUR-Trojan.MSIL.Quasar.gen-788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
SHA256 788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
Tags
office04 quasar persistence 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

788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c

Threat Level: Known bad

The file HEUR-Trojan.MSIL.Quasar.gen-788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c was found to be: Known bad.

Malicious Activity Summary

office04 quasar persistence spyware trojan

Detects Windows executables referencing non-Windows User-Agents

Quasar payload

Detects executables containing common artifacts observed in infostealers

Quasar RAT

Quasar family

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

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

Detects Windows executables referencing non-Windows User-Agents

Detects executables containing common artifacts observed in infostealers

Executes dropped EXE

Adds Run key to start application

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

Uses Task Scheduler COM API

Suspicious use of SendNotifyMessage

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-15 08:38

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

2024-04-15 08:38

Reported

2024-04-15 08:41

Platform

win7-20240221-en

Max time kernel

130s

Max time network

142s

Command Line

"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.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\Client.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Roaming\SubDir\Client.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\HEUR-Trojan.MSIL.Quasar.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe

"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"

C:\Windows\system32\schtasks.exe

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

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

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

C:\Windows\system32\schtasks.exe

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

Network

Country Destination Domain Proto
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp

Files

memory/1056-0-0x0000000001370000-0x00000000016D6000-memory.dmp

memory/1056-1-0x000007FEF5470000-0x000007FEF5E5C000-memory.dmp

memory/1056-2-0x000000001B2E0000-0x000000001B360000-memory.dmp

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

MD5 a585d666df5ca83eabcd06a4f0364523
SHA1 4f5d8d09aaaf33efda276c3f7ab9883eda146da6
SHA256 788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
SHA512 4cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544

memory/2544-9-0x0000000000300000-0x0000000000666000-memory.dmp

memory/2544-10-0x000007FEF5470000-0x000007FEF5E5C000-memory.dmp

memory/1056-8-0x000007FEF5470000-0x000007FEF5E5C000-memory.dmp

memory/2544-11-0x000007FEF5470000-0x000007FEF5E5C000-memory.dmp

memory/2544-12-0x000000001AFC0000-0x000000001B040000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-15 08:38

Reported

2024-04-15 08:41

Platform

win10v2004-20240412-en

Max time kernel

146s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.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\Client.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4092317236-2027488869-1227795436-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-4092317236-2027488869-1227795436-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" C:\Users\Admin\AppData\Roaming\SubDir\Client.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\HEUR-Trojan.MSIL.Quasar.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe

"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"

C:\Windows\SYSTEM32\schtasks.exe

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

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

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

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 69.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
US 8.8.8.8:53 21.114.53.23.in-addr.arpa udp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 9.139.73.23.in-addr.arpa udp
ES 85.219.48.223:6969 tcp
US 8.8.8.8:53 227.143.123.92.in-addr.arpa udp
ES 85.219.48.223:6969 tcp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 216.197.17.2.in-addr.arpa udp
ES 85.219.48.223:6969 tcp
ES 85.219.48.223:6969 tcp
US 8.8.8.8:53 2.173.189.20.in-addr.arpa udp

Files

memory/932-0-0x00000000007C0000-0x0000000000B26000-memory.dmp

memory/932-1-0x00007FFE06710000-0x00007FFE071D1000-memory.dmp

memory/932-2-0x000000001B890000-0x000000001B8A0000-memory.dmp

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

MD5 a585d666df5ca83eabcd06a4f0364523
SHA1 4f5d8d09aaaf33efda276c3f7ab9883eda146da6
SHA256 788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
SHA512 4cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544

memory/932-9-0x00007FFE06710000-0x00007FFE071D1000-memory.dmp

memory/1912-10-0x00007FFE06710000-0x00007FFE071D1000-memory.dmp

memory/1912-11-0x000000001BB50000-0x000000001BB60000-memory.dmp

memory/1912-12-0x0000000002F00000-0x0000000002F50000-memory.dmp

memory/1912-13-0x000000001C560000-0x000000001C612000-memory.dmp

memory/1912-14-0x00007FFE06710000-0x00007FFE071D1000-memory.dmp

memory/1912-15-0x000000001BB50000-0x000000001BB60000-memory.dmp