Malware Analysis Report

2024-08-06 11:49

Sample ID 240610-qlm9aaxeqk
Target 37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe
SHA256 37fa30c9dcf255bda62c0a6b7f88a48263a3da18d18d8c66b1cbbc801077cfdf
Tags
quasar beobeo 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

37fa30c9dcf255bda62c0a6b7f88a48263a3da18d18d8c66b1cbbc801077cfdf

Threat Level: Known bad

The file 37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe was found to be: Known bad.

Malicious Activity Summary

quasar beobeo spyware trojan

Quasar RAT

Quasar family

Quasar payload

Executes dropped EXE

Unsigned PE

Creates scheduled task(s)

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

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
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-10 13:21

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

2024-06-10 13:21

Reported

2024-06-10 13:23

Platform

win10v2004-20240508-en

Max time kernel

143s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.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\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.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\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4264 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4264 wrote to memory of 2564 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Windows\SYSTEM32\schtasks.exe
PID 4264 wrote to memory of 2072 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe
PID 4264 wrote to memory of 2072 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe
PID 2072 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe C:\Windows\SYSTEM32\schtasks.exe
PID 2072 wrote to memory of 2492 N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe C:\Windows\SYSTEM32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe

"C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Realtek" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe

"C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe"

C:\Windows\SYSTEM32\schtasks.exe

"schtasks" /create /tn "Realtek" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe" /rl HIGHEST /f

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4500,i,9746875443948590908,1444894342962555245,262144 --variations-seed-version --mojo-platform-channel-handle=4180 /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp

Files

memory/4264-0-0x00007FFB408D3000-0x00007FFB408D5000-memory.dmp

memory/4264-1-0x0000000000F00000-0x0000000000F84000-memory.dmp

memory/4264-2-0x00007FFB408D0000-0x00007FFB41391000-memory.dmp

C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe

MD5 a760c4263a2d1e144c2fd116bf1351e1
SHA1 98da7637a98df832078ed0ec08d11d588223783e
SHA256 37fa30c9dcf255bda62c0a6b7f88a48263a3da18d18d8c66b1cbbc801077cfdf
SHA512 ee8ff2686a4a95a779711ca3126423f769351de6b9e8a27d0ff0d78212e76ef703ada91778620799dd3dbe07cea840f7f44c65273278ea3b4f539274dbc806bf

memory/2072-8-0x00007FFB408D0000-0x00007FFB41391000-memory.dmp

memory/4264-9-0x00007FFB408D0000-0x00007FFB41391000-memory.dmp

memory/2072-10-0x00007FFB408D0000-0x00007FFB41391000-memory.dmp

memory/2072-11-0x0000000000A00000-0x0000000000A50000-memory.dmp

memory/2072-12-0x000000001B3C0000-0x000000001B472000-memory.dmp

memory/2072-13-0x00007FFB408D0000-0x00007FFB41391000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-10 13:21

Reported

2024-06-10 13:23

Platform

win7-20240508-en

Max time kernel

150s

Max time network

155s

Command Line

"C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.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\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.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\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2840 wrote to memory of 1924 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Windows\system32\schtasks.exe
PID 2840 wrote to memory of 1924 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Windows\system32\schtasks.exe
PID 2840 wrote to memory of 1924 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Windows\system32\schtasks.exe
PID 2840 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe
PID 2840 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe
PID 2840 wrote to memory of 2292 N/A C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe
PID 2292 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe C:\Windows\system32\schtasks.exe
PID 2292 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe C:\Windows\system32\schtasks.exe
PID 2292 wrote to memory of 2788 N/A C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe C:\Windows\system32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe

"C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Realtek" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\37FA30C9DCF255BDA62C0A6B7F88A48263A3DA18D18D8.exe" /rl HIGHEST /f

C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe

"C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe"

C:\Windows\system32\schtasks.exe

"schtasks" /create /tn "Realtek" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe" /rl HIGHEST /f

Network

Country Destination Domain Proto
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp
VN 222.253.182.185:9090 tcp

Files

memory/2840-0-0x000007FEF5C23000-0x000007FEF5C24000-memory.dmp

memory/2840-1-0x0000000001000000-0x0000000001084000-memory.dmp

memory/2840-2-0x000007FEF5C20000-0x000007FEF660C000-memory.dmp

C:\Users\Admin\AppData\Roaming\Realtek HD Audio Universal Services\Realtek HD Audio Universal Services.exe

MD5 a760c4263a2d1e144c2fd116bf1351e1
SHA1 98da7637a98df832078ed0ec08d11d588223783e
SHA256 37fa30c9dcf255bda62c0a6b7f88a48263a3da18d18d8c66b1cbbc801077cfdf
SHA512 ee8ff2686a4a95a779711ca3126423f769351de6b9e8a27d0ff0d78212e76ef703ada91778620799dd3dbe07cea840f7f44c65273278ea3b4f539274dbc806bf

memory/2840-8-0x000007FEF5C20000-0x000007FEF660C000-memory.dmp

memory/2292-7-0x0000000000DD0000-0x0000000000E54000-memory.dmp

memory/2292-9-0x000007FEF5C20000-0x000007FEF660C000-memory.dmp

memory/2292-10-0x000007FEF5C20000-0x000007FEF660C000-memory.dmp

memory/2292-11-0x000007FEF5C20000-0x000007FEF660C000-memory.dmp