Malware Analysis Report

2025-01-18 04:06

Sample ID 241025-jsv45sxhrl
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 RAT

Quasar family

Quasar payload

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 07:56

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 07:56

Reported

2024-10-25 07:58

Platform

win7-20240708-en

Max time kernel

150s

Max time network

135s

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
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

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
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/1700-0-0x000007FEF6343000-0x000007FEF6344000-memory.dmp

memory/1700-1-0x0000000000B50000-0x0000000000E74000-memory.dmp

memory/1700-2-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/1700-7-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

memory/1852-9-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

memory/1852-8-0x00000000001B0000-0x00000000004D4000-memory.dmp

memory/1852-10-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

memory/1852-11-0x000007FEF6340000-0x000007FEF6D2C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-25 07:56

Reported

2024-10-25 07:58

Platform

win10v2004-20241007-en

Max time kernel

135s

Max time network

141s

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 3424 wrote to memory of 1564 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 3424 wrote to memory of 1564 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 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.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 57.169.31.20.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.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 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 101.209.201.84.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 79.190.18.2.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 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
N/A 192.168.1.103:4782 tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa 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
N/A 192.168.1.103:4782 tcp

Files

memory/3424-0-0x00007FFD40313000-0x00007FFD40315000-memory.dmp

memory/3424-1-0x00000000007E0000-0x0000000000B04000-memory.dmp

memory/3424-2-0x00007FFD40310000-0x00007FFD40DD1000-memory.dmp

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

MD5 e66da355fd3824d7cb83a1460ccdf7ff
SHA1 e5c00c3fcb2703b7e71e6a39bb6b3fff0d60c938
SHA256 b99db344c7736d6670081a4aa48a62b2ea3566b2e665413c5c0fbbcf43f8c9ca
SHA512 411a983f86bd1eb28326bbe03fdf76146c7acf813051876f00474bc96725d5fae4bc59b527c3ce80a39f9146ad6c4dfee18adc5056ab8ac80e57e4e27fbae856

memory/1564-8-0x00007FFD40310000-0x00007FFD40DD1000-memory.dmp

memory/3424-9-0x00007FFD40310000-0x00007FFD40DD1000-memory.dmp

memory/1564-10-0x00007FFD40310000-0x00007FFD40DD1000-memory.dmp

memory/1564-11-0x000000001B020000-0x000000001B070000-memory.dmp

memory/1564-12-0x000000001B470000-0x000000001B522000-memory.dmp

memory/1564-13-0x00007FFD40310000-0x00007FFD40DD1000-memory.dmp