Malware Analysis Report

2024-08-06 11:13

Sample ID 240614-25grdszdrg
Target Client-built.exe
SHA256 47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357
Tags
quasar school spyware trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357

Threat Level: Known bad

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

Malicious Activity Summary

quasar school spyware trojan

Quasar family

Quasar RAT

Quasar payload

Executes dropped EXE

Looks up external IP address via web service

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Creates scheduled task(s)

Suspicious use of SetWindowsHookEx

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Scheduled Task/Job
T1053
Persistence
TA0003
Scheduled Task/Job
T1053
Privilege Escalation
TA0004
Scheduled Task/Job
T1053
Defense Evasion
TA0005
Credential Access
TA0006
Discovery
TA0007
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-14 23:09

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: behavioral2

Detonation Overview

Submitted

2024-06-14 23:09

Reported

2024-06-14 23:12

Platform

win10v2004-20240611-en

Max time kernel

93s

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

Executes dropped EXE

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

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A
N/A N/A C:\Windows\SysWOW64\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 SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3508 wrote to memory of 368 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 3508 wrote to memory of 368 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 3508 wrote to memory of 368 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 3508 wrote to memory of 4480 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 3508 wrote to memory of 4480 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 3508 wrote to memory of 4480 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4480 wrote to memory of 3428 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 4480 wrote to memory of 3428 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 4480 wrote to memory of 3428 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe

Processes

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

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

C:\Windows\SysWOW64\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

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

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

C:\Windows\SysWOW64\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 g.bing.com udp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 237.21.107.13.in-addr.arpa udp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 runderscore00-37568.portmap.host udp
DE 193.161.193.99:37568 runderscore00-37568.portmap.host tcp
US 8.8.8.8:53 99.193.161.193.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 57.15.31.184.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp

Files

memory/3508-0-0x000000007479E000-0x000000007479F000-memory.dmp

memory/3508-1-0x0000000000670000-0x00000000006DC000-memory.dmp

memory/3508-2-0x00000000055C0000-0x0000000005B64000-memory.dmp

memory/3508-3-0x0000000005010000-0x00000000050A2000-memory.dmp

memory/3508-4-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/3508-5-0x00000000050B0000-0x0000000005116000-memory.dmp

memory/3508-6-0x0000000005CB0000-0x0000000005CC2000-memory.dmp

memory/3508-7-0x00000000061F0000-0x000000000622C000-memory.dmp

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

MD5 0c84b58a5322284269f3b86e648e1fc8
SHA1 6776c3963a64a3ace4caaff164669364356f72aa
SHA256 47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357
SHA512 02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7

memory/3508-14-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4480-15-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4480-16-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4480-18-0x00000000062C0000-0x00000000062CA000-memory.dmp

memory/4480-19-0x0000000074790000-0x0000000074F40000-memory.dmp

memory/4480-20-0x0000000074790000-0x0000000074F40000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-14 23:09

Reported

2024-06-14 23:12

Platform

win10-20240404-en

Max time kernel

134s

Max time network

136s

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

Looks up external IP address via web service

Description Indicator Process Target
N/A ip-api.com N/A N/A

Creates scheduled task(s)

persistence
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\schtasks.exe N/A
N/A N/A C:\Windows\SysWOW64\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 SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4496 wrote to memory of 4720 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 4496 wrote to memory of 4720 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 4496 wrote to memory of 4720 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Windows\SysWOW64\schtasks.exe
PID 4496 wrote to memory of 4936 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4496 wrote to memory of 4936 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4496 wrote to memory of 4936 N/A C:\Users\Admin\AppData\Local\Temp\Client-built.exe C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
PID 4936 wrote to memory of 1796 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 4936 wrote to memory of 1796 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe
PID 4936 wrote to memory of 1796 N/A C:\Users\Admin\AppData\Roaming\SubDir\Client.exe C:\Windows\SysWOW64\schtasks.exe

Processes

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

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

C:\Windows\SysWOW64\schtasks.exe

"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f

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

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

C:\Windows\SysWOW64\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 ip-api.com udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 1.112.95.208.in-addr.arpa udp
US 208.95.112.1:80 ip-api.com tcp
US 8.8.8.8:53 runderscore00-37568.portmap.host udp
DE 193.161.193.99:37568 runderscore00-37568.portmap.host tcp
US 8.8.8.8:53 99.193.161.193.in-addr.arpa udp
US 8.8.8.8:53 66.112.168.52.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp

Files

memory/4496-0-0x00000000739EE000-0x00000000739EF000-memory.dmp

memory/4496-1-0x0000000000F10000-0x0000000000F7C000-memory.dmp

memory/4496-2-0x0000000005BE0000-0x00000000060DE000-memory.dmp

memory/4496-3-0x0000000005820000-0x00000000058B2000-memory.dmp

memory/4496-4-0x00000000739E0000-0x00000000740CE000-memory.dmp

memory/4496-5-0x00000000058C0000-0x0000000005926000-memory.dmp

memory/4496-6-0x0000000006460000-0x0000000006472000-memory.dmp

memory/4496-7-0x0000000006850000-0x000000000688E000-memory.dmp

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

MD5 0c84b58a5322284269f3b86e648e1fc8
SHA1 6776c3963a64a3ace4caaff164669364356f72aa
SHA256 47f06153275d1f01d1d7410eb5917aead5a79660be5da59bf51f31698343c357
SHA512 02bc07552096f2b052e064ed2941cde5b70058066b614fa7374dbf7aa2177458a22d9746181b8f88e3468b252adf7e1aa1518ed9085ed78af5b736a02fa297d7

memory/4496-14-0x00000000739E0000-0x00000000740CE000-memory.dmp

memory/4936-15-0x00000000739E0000-0x00000000740CE000-memory.dmp

memory/4936-16-0x00000000739E0000-0x00000000740CE000-memory.dmp

memory/4936-18-0x0000000006300000-0x000000000630A000-memory.dmp

memory/4936-19-0x00000000739E0000-0x00000000740CE000-memory.dmp

memory/4936-20-0x00000000739E0000-0x00000000740CE000-memory.dmp