Malware Analysis Report

2025-01-18 04:35

Sample ID 240108-n31jtsabc9
Target Client.exe
SHA256 8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c
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

8555743631267a78de02ae65d5454e3bfc2ac6c5336dab259fcff5316aba840c

Threat Level: Known bad

The file Client.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 SetWindowsHookEx

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-01-08 11:56

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

2024-01-08 11:56

Reported

2024-01-08 11:58

Platform

win7-20231129-en

Max time kernel

148s

Max time network

150s

Command Line

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

Creates scheduled task(s)

persistence
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.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

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.exe

"C:\Users\Admin\AppData\Local\Temp\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

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 s4.v100.vip udp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp
CN 43.248.117.189:27923 s4.v100.vip tcp

Files

memory/2240-0-0x0000000000F80000-0x00000000012A4000-memory.dmp

memory/2240-1-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

memory/2240-2-0x0000000000B50000-0x0000000000BD0000-memory.dmp

memory/2868-9-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

memory/2868-10-0x000000001B280000-0x000000001B300000-memory.dmp

memory/2240-8-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

memory/2868-7-0x0000000000FD0000-0x00000000012F4000-memory.dmp

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

MD5 edfb9f3a3c6d6cb393683d9d2200b51d
SHA1 ea5348dc526cea50caf687002313cce76ad87e87
SHA256 83e93e2987466d68f62e918018e15844625708a8c4fb267c4d375cc2c91c25e4
SHA512 a32a99d0dedd8330e8ed6c0fdb93b4f86bd5c9e2a9ee795a070a294d07480456704c810ff282c233e6e479f62a69437e1d83dfac274aad0798745d04ef2e1bee

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

MD5 f9116b0b62ae7417dbd550152df86a70
SHA1 8e6602bf208975f52055ba19b4c730bc1920f09b
SHA256 fa220355fedd412ffba9c3e8036ba1183d1347097ae2e9909376b3f6d8183f30
SHA512 6334a7e03fa817661c9f36ff2e16bf37132bd3d5cc00cccf57c962b25be80049e3a30fdb2f7681fa3d4fe9b2d58422db9e42946a038c8896a080e26de9a1929d

memory/2868-11-0x000007FEF5250000-0x000007FEF5C3C000-memory.dmp

memory/2868-12-0x000000001B280000-0x000000001B300000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-08 11:56

Reported

2024-01-08 11:58

Platform

win10v2004-20231215-en

Max time kernel

147s

Max time network

126s

Command Line

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

Signatures

Quasar RAT

trojan spyware quasar

Quasar payload

Description Indicator Process Target
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

Creates scheduled task(s)

persistence
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.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe N/A

Suspicious use of SetWindowsHookEx

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.exe

"C:\Users\Admin\AppData\Local\Temp\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

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 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 23.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 203.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 s4.v100.vip udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 114.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 145.71.91.104.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 104.241.123.92.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
CN 43.248.117.189:27923 s4.v100.vip tcp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 181.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 udp
US 8.8.8.8:53 197.178.17.96.in-addr.arpa udp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
CN 43.248.117.189:27923 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
US 8.8.8.8:53 udp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
US 8.8.8.8:53 udp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
US 204.79.197.200:443 g.bing.com tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
US 8.8.8.8:53 udp
GB 88.221.135.211:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
GB 88.221.135.211:80 tcp
GB 96.17.178.197:80 tcp
GB 96.17.178.197:80 tcp
GB 88.221.135.211:80 tcp
US 8.8.8.8:53 udp
GB 88.221.135.211:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 udp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
US 8.8.8.8:53 udp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
CN 43.248.117.189:27923 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
GB 96.17.178.195:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 udp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 8.8.8.8:53 udp
GB 88.221.135.211:80 tcp
US 93.184.221.240:80 tcp
GB 88.221.135.211:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
GB 88.221.135.211:80 tcp
GB 88.221.135.211:80 tcp
GB 88.221.135.211:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp
US 93.184.221.240:80 tcp

Files

memory/4908-0-0x0000000000040000-0x0000000000364000-memory.dmp

memory/4908-2-0x000000001B000000-0x000000001B010000-memory.dmp

memory/4908-1-0x00007FFBE3C80000-0x00007FFBE4741000-memory.dmp

memory/3164-9-0x00007FFBE3C80000-0x00007FFBE4741000-memory.dmp

memory/4908-10-0x00007FFBE3C80000-0x00007FFBE4741000-memory.dmp

memory/3164-11-0x000000001B8D0000-0x000000001B8E0000-memory.dmp

memory/3164-12-0x000000001BEE0000-0x000000001BF30000-memory.dmp

memory/3164-13-0x000000001BFF0000-0x000000001C0A2000-memory.dmp

memory/3164-14-0x00007FFBE3C80000-0x00007FFBE4741000-memory.dmp

memory/3164-15-0x000000001B8D0000-0x000000001B8E0000-memory.dmp