Malware Analysis Report

2025-01-18 04:07

Sample ID 241025-jfzlsswhmb
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 WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-10-25 07:37

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

2024-10-25 07:37

Reported

2024-10-25 07:42

Platform

win10v2004-20241007-en

Max time kernel

297s

Max time network

299s

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 1364 wrote to memory of 4292 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 1364 wrote to memory of 4292 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 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 22.160.190.20.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
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.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
US 8.8.8.8:53 138.201.86.20.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 150.171.28.10:443 tse1.mm.bing.net tcp
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

Files

memory/1364-0-0x00007FF878A33000-0x00007FF878A35000-memory.dmp

memory/1364-1-0x00000000003A0000-0x00000000006C4000-memory.dmp

memory/1364-2-0x00007FF878A30000-0x00007FF8794F1000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/4292-8-0x00007FF878A30000-0x00007FF8794F1000-memory.dmp

memory/1364-9-0x00007FF878A30000-0x00007FF8794F1000-memory.dmp

memory/4292-10-0x00007FF878A30000-0x00007FF8794F1000-memory.dmp

memory/4292-11-0x000000001BF40000-0x000000001BF90000-memory.dmp

memory/4292-12-0x000000001C050000-0x000000001C102000-memory.dmp

memory/4292-13-0x00007FF878A30000-0x00007FF8794F1000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-25 07:37

Reported

2024-10-25 07:42

Platform

win10ltsc2021-20241023-en

Max time kernel

296s

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 4944 wrote to memory of 1772 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4944 wrote to memory of 1772 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 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 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 8.8.8.8:53 197.87.175.4.in-addr.arpa udp
US 8.8.8.8:53 fd.api.iris.microsoft.com udp
FR 20.74.47.205:443 fd.api.iris.microsoft.com tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 0.205.248.87.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 43.229.111.52.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

Files

memory/4944-0-0x00007FFE2AAA3000-0x00007FFE2AAA5000-memory.dmp

memory/4944-1-0x0000000000B10000-0x0000000000E34000-memory.dmp

memory/4944-2-0x00007FFE2AAA0000-0x00007FFE2B562000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/4944-5-0x00007FFE2AAA0000-0x00007FFE2B562000-memory.dmp

memory/1772-6-0x00007FFE2AAA0000-0x00007FFE2B562000-memory.dmp

memory/1772-7-0x00007FFE2AAA0000-0x00007FFE2B562000-memory.dmp

memory/1772-8-0x000000001B1C0000-0x000000001B210000-memory.dmp

memory/1772-9-0x000000001DBA0000-0x000000001DC52000-memory.dmp

memory/1772-10-0x00007FFE2AAA0000-0x00007FFE2B562000-memory.dmp