Malware Analysis Report

2025-01-18 04:11

Sample ID 241025-jhfayaxglj
Target Client-built.exe
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
Tags
office04 quasar spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca

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

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-10-25 07:39

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

2024-10-25 07:39

Reported

2024-10-25 07:45

Platform

win10v2004-20241007-en

Max time kernel

298s

Max time network

300s

Command Line

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

Executes dropped EXE

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

Description Indicator Process Target
PID 1356 wrote to memory of 3728 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 1356 wrote to memory of 3728 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Processes

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

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

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

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

Network

Country Destination Domain Proto
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 73.190.18.2.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 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 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 10.28.171.150.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp

Files

memory/1356-0-0x00007FFEB3CD3000-0x00007FFEB3CD5000-memory.dmp

memory/1356-1-0x0000000000770000-0x0000000000A94000-memory.dmp

memory/1356-2-0x00007FFEB3CD0000-0x00007FFEB4791000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/3728-9-0x00007FFEB3CD0000-0x00007FFEB4791000-memory.dmp

memory/1356-8-0x00007FFEB3CD0000-0x00007FFEB4791000-memory.dmp

memory/3728-10-0x00007FFEB3CD0000-0x00007FFEB4791000-memory.dmp

memory/3728-11-0x000000001BC10000-0x000000001BC60000-memory.dmp

memory/3728-12-0x000000001C1B0000-0x000000001C262000-memory.dmp

memory/3728-13-0x00007FFEB3CD0000-0x00007FFEB4791000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-25 07:39

Reported

2024-10-25 07:45

Platform

win10ltsc2021-20241023-en

Max time kernel

298s

Max time network

301s

Command Line

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

Executes dropped EXE

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

Description Indicator Process Target
PID 3724 wrote to memory of 4612 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 3724 wrote to memory of 4612 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Processes

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

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

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

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

Network

Country Destination Domain Proto
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
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 fd.api.iris.microsoft.com udp
IE 20.223.36.55:443 fd.api.iris.microsoft.com tcp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 48.229.111.52.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp
N/A 192.168.1.103:4782 tcp

Files

memory/3724-0-0x00007FF8F3553000-0x00007FF8F3555000-memory.dmp

memory/3724-1-0x00000000007F0000-0x0000000000B14000-memory.dmp

memory/3724-2-0x00007FF8F3550000-0x00007FF8F4012000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/4612-5-0x00007FF8F3550000-0x00007FF8F4012000-memory.dmp

memory/3724-6-0x00007FF8F3550000-0x00007FF8F4012000-memory.dmp

memory/4612-7-0x00007FF8F3550000-0x00007FF8F4012000-memory.dmp

memory/4612-8-0x0000000002E50000-0x0000000002EA0000-memory.dmp

memory/4612-9-0x000000001E330000-0x000000001E3E2000-memory.dmp

memory/4612-10-0x00007FF8F3550000-0x00007FF8F4012000-memory.dmp