Malware Analysis Report

2024-09-23 02:07

Sample ID 240622-2epz3sxdmh
Target Runtime Broker.exe
SHA256 637aff987be6ea158b7182de9de5de0054407077511019516270d82a6f2e9b69
Tags
xworm execution persistence rat trojan
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 execution persistence rat trojan

Xworm

Detect Xworm Payload

Xworm family

Command and Scripting Interpreter: PowerShell

Drops startup file

Executes dropped EXE

Checks computer location settings

Adds Run key to start application

Looks up external IP address via web service

Enumerates physical storage devices

Unsigned PE

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

Scheduled Task/Job: Scheduled Task

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

MITRE ATT&CK Matrix V13

Analysis: static1

Detonation Overview

Reported

2024-06-22 22:29

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 22:29

Reported

2024-06-22 22:30

Platform

win7-20240611-en

Max time kernel

0s

Max time network

4s

Command Line

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

Signatures

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

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-22 22:29

Reported

2024-06-22 22:35

Platform

win10v2004-20240508-en

Max time kernel

329s

Max time network

327s

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-1-5-21-1181767204-2009306918-3718769404-1000\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
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-1-5-21-1181767204-2009306918-3718769404-1000\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
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 2604 wrote to memory of 4852 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 4852 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 1812 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 1812 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 3192 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 3192 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 1872 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 1872 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
PID 2604 wrote to memory of 1912 N/A C:\Users\Admin\AppData\Local\Temp\Runtime Broker.exe C:\Windows\System32\schtasks.exe
PID 2604 wrote to memory of 1912 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:\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=1272,i,13544508926340531097,6671217806016090640,262144 --variations-seed-version --mojo-platform-channel-handle=4240 /prefetch:8

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"

C:\ProgramData\Runtime Broker.exe

"C:\ProgramData\Runtime Broker.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 203.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 13.227.111.52.in-addr.arpa udp
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 8.8.8.8:53 medical-m.gl.at.ply.gg udp
US 147.185.221.16:28857 medical-m.gl.at.ply.gg tcp
US 8.8.8.8:53 16.221.185.147.in-addr.arpa udp
US 8.8.8.8:53 24.73.42.20.in-addr.arpa udp

Files

memory/2604-0-0x00007FFFAC523000-0x00007FFFAC525000-memory.dmp

memory/2604-1-0x0000000000210000-0x0000000000228000-memory.dmp

memory/2604-2-0x00007FFFAC523000-0x00007FFFAC525000-memory.dmp

memory/2604-3-0x00007FFFAC520000-0x00007FFFACFE1000-memory.dmp

memory/4852-4-0x00007FFFAC520000-0x00007FFFACFE1000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qhgifjpl.sxu.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/4852-10-0x0000023E31DE0000-0x0000023E31E02000-memory.dmp

memory/4852-15-0x00007FFFAC520000-0x00007FFFACFE1000-memory.dmp

memory/4852-16-0x00007FFFAC520000-0x00007FFFACFE1000-memory.dmp

memory/4852-19-0x00007FFFAC520000-0x00007FFFACFE1000-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 77d622bb1a5b250869a3238b9bc1402b
SHA1 d47f4003c2554b9dfc4c16f22460b331886b191b
SHA256 f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb
SHA512 d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

MD5 96e3b86880fedd5afc001d108732a3e5
SHA1 8fc17b39d744a9590a6d5897012da5e6757439a3
SHA256 c3077e4cadb4ed246c02abe55aa6cf832fee4c2546b7addb7d22cd1c7c8c1294
SHA512 909b1968f7204fa7029109b02232d8cc5438f6b4dc7c9044e4e47c59fcee538199b13029e36592b12ed573d48a308dd4822d2ced4129ab08d4111897e02be55d

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

MD5 22310ad6749d8cc38284aa616efcd100
SHA1 440ef4a0a53bfa7c83fe84326a1dff4326dcb515
SHA256 55b1d8021c4eb4c3c0d75e3ed7a4eb30cd0123e3d69f32eeb596fe4ffec05abf
SHA512 2ef08e2ee15bb86695fe0c10533014ffed76ececc6e579d299d3365fafb7627f53e32e600bb6d872b9f58aca94f8cb7e1e94cdfd14777527f7f0aa019d9c6def

memory/2604-58-0x00007FFFAC520000-0x00007FFFACFE1000-memory.dmp

C:\ProgramData\Runtime Broker.exe

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

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

MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1