Malware Analysis Report

2025-01-18 04:11

Sample ID 241031-ayn4cavgrj
Target Client-built.exe
SHA256 fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
Tags
office04 quasar 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

fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

Threat Level: Known bad

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

Malicious Activity Summary

office04 quasar spyware trojan

Quasar family

Quasar payload

Quasar RAT

Executes dropped EXE

Unsigned PE

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Uses Task Scheduler COM API

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-31 00:37

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

2024-10-31 00:37

Reported

2024-10-31 00:40

Platform

win7-20240903-en

Max time kernel

149s

Max time network

136s

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

Network

Country Destination Domain Proto
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp
N/A 10.127.1.2:1604 tcp

Files

memory/2348-0-0x000007FEF6083000-0x000007FEF6084000-memory.dmp

memory/2348-1-0x0000000000910000-0x0000000000C34000-memory.dmp

memory/2348-2-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

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

MD5 dca77ba52c9e20bdb3fcb81657918f89
SHA1 7cec39d83783008bb9a151b2a71dbc1eb03a7bbf
SHA256 fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
SHA512 30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

memory/1872-7-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

memory/2348-9-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

memory/1872-8-0x00000000012C0000-0x00000000015E4000-memory.dmp

memory/1872-10-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

memory/1872-11-0x000007FEF6080000-0x000007FEF6A6C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-31 00:37

Reported

2024-10-31 00:40

Platform

win10v2004-20241007-en

Max time kernel

145s

Max time network

148s

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 226.108.222.173.in-addr.arpa udp
US 8.8.8.8:53 72.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 10.27.171.150.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 101.11.19.2.in-addr.arpa udp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 210.108.222.173.in-addr.arpa udp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
US 150.171.28.10:443 tse1.mm.bing.net tcp
N/A 10.127.1.2:1604 tcp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp

Files

memory/3528-0-0x00007FFA102C3000-0x00007FFA102C5000-memory.dmp

memory/3528-1-0x00000000001F0000-0x0000000000514000-memory.dmp

memory/3528-2-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

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

MD5 dca77ba52c9e20bdb3fcb81657918f89
SHA1 7cec39d83783008bb9a151b2a71dbc1eb03a7bbf
SHA256 fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
SHA512 30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

memory/528-8-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/3528-9-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/528-10-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

memory/528-11-0x000000001C680000-0x000000001C6D0000-memory.dmp

memory/528-12-0x000000001C790000-0x000000001C842000-memory.dmp

memory/528-13-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp