Malware Analysis Report

2024-09-23 02:06

Sample ID 240622-1wyg4swdlc
Target Runtime Broker.exe
SHA256 637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69
Tags
xworm rat trojan execution persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

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

637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69

Threat Level: Known bad

The file Runtime Broker.exe was found to be: Known bad.

Malicious Activity Summary

xworm rat trojan execution persistence

Detect Xworm Payload

Xworm

Xworm family

Command and Scripting Interpreter: PowerShell

Drops startup file

Executes dropped EXE

Checks computer location settings

Looks up external IP address via web service

Adds Run key to start application

Unsigned PE

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Scheduled Task/Job: Scheduled Task

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-22 22:00

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A

Xworm family

xworm

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-22 22:00

Reported

2024-06-22 22:00

Platform

win7-20240508-en

Max time kernel

0s

Max time network

0s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A

Xworm

trojan rat xworm

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe

"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"

Network

N/A

Files

memory/2132-0-0x000007FEF5623000-0x000007FEF5624000-memory.dmp

memory/2132-1-0x00000000010F0000-0x0000000001108000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-22 22:00

Reported

2024-06-22 22:02

Platform

win10v2004-20240508-en

Max time kernel

105s

Max time network

81s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"

Signatures

Detect Xworm Payload

Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A

Xworm

trojan rat xworm

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A

Drops startup file

Description Indicator Process Target
File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Runtime Broker.lnk C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A
File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Runtime Broker.lnk C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\Runtime Broker.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Runtime Broker = "C:\\ProgramData\\Runtime Broker.exe" C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A

Looks up external IP address via web service

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

Enumerates physical storage devices

Scheduled Task/Job: Scheduled Task

persistence execution
Description Indicator Process Target
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\Runtime Broker.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A
Token: SeDebugPrivilege N/A C:\ProgramData\Runtime Broker.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2428 wrote to memory of 4800 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 4800 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 4408 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 4408 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 5012 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 5012 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 1368 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2428 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\schtasks.exe
PID 2428 wrote to memory of 1356 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\schtasks.exe

Uses Task Scheduler COM API

persistence

Processes

C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe

"C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe"

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Runtime Broker.exe'

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'

C:\Windows\System32\schtasks.exe

"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Runtime Broker" /tr "C:\ProgramData\Runtime Broker.exe"

C:\ProgramData\Runtime Broker.exe

"C:\ProgramData\Runtime Broker.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 ip-api.com udp
US 8.8.8.8:53 medical-m.gl.at.ply.gg udp

Files

memory/2428-0-0x00007FFDB32A3000-0x00007FFDB32A5000-memory.dmp

memory/2428-1-0x0000000000FA0000-0x0000000000FB8000-memory.dmp

memory/2428-2-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp

memory/4800-3-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp

memory/4800-4-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp

memory/4800-10-0x000002926BB10000-0x000002926BB32000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_r0w1cspy.y3k.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4800-15-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp

memory/4800-18-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

MD5 5f0ddc7f3691c81ee14d17b419ba220d
SHA1 f0ef5fde8bab9d17c0b47137e014c91be888ee53
SHA256 a31805264b8b13ce4145f272cb2830728c186c46e314b48514d636866217add5
SHA512 2ce7c2a0833f581297c13dd88ccfcd36bf129d2b5d7718c52b1d67c97cbd8fc93abc085a040229a0fd712e880c690de7f6b996b0b47c46a091fabb7931be58d3

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

MD5 2253c665505da63342ef14dd8197f0b5
SHA1 466f37281031aea4ac775d9fb8e91489a85faf82
SHA256 27948dca356cfdff3a5480bdca63a66963505ad1bdc7ff42d1380bf418667436
SHA512 c45fd978256c168493b900ffddded099e0717068b772012bdebfcdcb2377f7a4adf2b968eb37125ed98fdcfb277c9f81fa02f90cfec60f4915d3027c27d7da0d

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

MD5 be67063c62a242565760a02a642a9f02
SHA1 d1043a892b44d6676f71b568f578fff947266a19
SHA256 56f158298dc5f781d6636a0b15d040f9cffb1d46cd11079aa40a26b662217f48
SHA512 90d2cbd882ff8043412ad25e74df0cf6b71d6f3fbdfa6f1efa0efc8eed86a925606c7d2e967f112a34d3f0e04f01a396898508571400dcf7e6fd69e78f406638

C:\ProgramData\Runtime Broker.exe

MD5 89af2aaffc3ddda07a0fc977c8bb2236
SHA1 412bd5812599d5729a51d0350df48030b0d04e1a
SHA256 637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69
SHA512 8c2b26d0f1b0ae80149a2aaadef329ab7fb3495bdfbccb7f8ff60368094cd955829b2cb1217b16808ac41a223661d48c2dcf88d3daeddc6b699aa88272be75ae

memory/2428-59-0x00007FFDB32A0000-0x00007FFDB3D61000-memory.dmp