Malware Analysis Report

2025-01-18 04:10

Sample ID 241103-v5jgnaypf1
Target Client-built.exe
SHA256 54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd
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

54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd

Threat Level: Known bad

The file Client-built.exe was found to be: Known bad.

Malicious Activity Summary

quasar office04 spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Enumerates physical storage devices

Unsigned PE

Suspicious use of FindShellTrayWindow

Suspicious use of WriteProcessMemory

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of SendNotifyMessage

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-03 17:34

Signatures

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

2024-11-03 17:34

Reported

2024-11-03 17:36

Platform

win7-20240903-en

Max time kernel

146s

Max time network

149s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

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

Executes dropped EXE

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

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
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\Client-built.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\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "java updater" /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 "java updater" /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 Inversin-43597.portmap.host udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp

Files

memory/2692-0-0x000007FEF61F3000-0x000007FEF61F4000-memory.dmp

memory/2692-1-0x0000000001240000-0x0000000001564000-memory.dmp

memory/2692-2-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

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

MD5 3a96e758409eeabc8836a8665980e01b
SHA1 50f6950089a997ccdac2c0790f4745bb84792a32
SHA256 54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd
SHA512 f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8

memory/2692-7-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

memory/3024-9-0x0000000000170000-0x0000000000494000-memory.dmp

memory/3024-8-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

memory/3024-10-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

memory/3024-11-0x000007FEF61F0000-0x000007FEF6BDC000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-03 17:34

Reported

2024-11-03 17:36

Platform

win10v2004-20241007-en

Max time kernel

144s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

Signatures

Quasar RAT

trojan spyware quasar

Quasar family

quasar

Quasar payload

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

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
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\Client-built.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
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A
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
N/A N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A
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\Client-built.exe

"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"

C:\Windows\SYSTEM32\schtasks.exe

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 150.171.28.10:443 g.bing.com tcp
US 8.8.8.8:53 71.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 Inversin-43597.portmap.host udp
DE 193.161.193.99:43597 Inversin-43597.portmap.host tcp
US 8.8.8.8:53 99.193.161.193.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 ipwho.is udp
DE 195.201.57.90:443 ipwho.is tcp
US 8.8.8.8:53 90.57.201.195.in-addr.arpa udp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 86.49.80.91.in-addr.arpa udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp

Files

memory/4788-1-0x0000000000460000-0x0000000000784000-memory.dmp

memory/4788-0-0x00007FFE3D2D3000-0x00007FFE3D2D5000-memory.dmp

memory/4788-2-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

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

MD5 3a96e758409eeabc8836a8665980e01b
SHA1 50f6950089a997ccdac2c0790f4745bb84792a32
SHA256 54ecf97fe6dc81aca8e7f68df713edebfd020c0eff68a1919bef11bd32136dcd
SHA512 f07548c69a5280fbac5fa28c1cad876fe0329757990b6f04200f8d1ab2f30a87cfdb784d2cb3364d72b2538360200c79582a22d094bd5165890876b8003807c8

memory/4788-9-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

memory/812-8-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

memory/812-10-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

memory/812-11-0x000000001C9A0000-0x000000001C9F0000-memory.dmp

memory/812-12-0x000000001CAB0000-0x000000001CB62000-memory.dmp

memory/812-16-0x000000001CA50000-0x000000001CA8C000-memory.dmp

memory/812-15-0x000000001C9F0000-0x000000001CA02000-memory.dmp

memory/812-17-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp

memory/812-18-0x00007FFE3D2D0000-0x00007FFE3DD91000-memory.dmp