Malware Analysis Report

2024-09-11 13:53

Sample ID 240615-gexdyatfqm
Target Nrfvvuactxo.exe
SHA256 4a5bbd5ba1ed7614f8b9ded791b172ab6ff2f3daa7da24c75922f9eaf18967d0
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 Overview

score
10/10

SHA256

4a5bbd5ba1ed7614f8b9ded791b172ab6ff2f3daa7da24c75922f9eaf18967d0

Threat Level: Known bad

The file Nrfvvuactxo.exe was found to be: Known bad.

Malicious Activity Summary

xworm execution persistence rat trojan

Detect Xworm Payload

Xworm

Command and Scripting Interpreter: PowerShell

Adds Run key to start application

Legitimate hosting services abused for malware hosting/C2

Looks up external IP address via web service

Suspicious use of SetThreadContext

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Command and Scripting Interpreter
T1059
PowerShell
T1059.001
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Registry Run Keys / Startup Folder
T1547.001
Defense Evasion
TA0005
Modify Registry
T1112
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Web Service
T1102
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-15 05:43

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-15 05:43

Reported

2024-06-15 05:44

Platform

win11-20240611-en

Max time kernel

58s

Max time network

58s

Command Line

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

Signatures

Detect Xworm Payload

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

Xworm

trojan rat xworm

Command and Scripting Interpreter: PowerShell

execution
Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2198854727-3842442895-2838824242-1000\Software\Microsoft\Windows\CurrentVersion\Run\Ilvrcqkyi = "C:\\Users\\Admin\\AppData\\Roaming\\Ilvrcqkyi.exe" C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A

Legitimate hosting services abused for malware hosting/C2

Description Indicator Process Target
N/A pastebin.com N/A N/A
N/A pastebin.com N/A N/A

Looks up external IP address via web service

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 332 set thread context of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe N/A
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe N/A

Suspicious use of SetWindowsHookEx

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 332 wrote to memory of 2316 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe
PID 2316 wrote to memory of 3684 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2316 wrote to memory of 3684 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2316 wrote to memory of 3684 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2316 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2316 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
PID 2316 wrote to memory of 3016 N/A C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

Processes

C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe

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

C:\Users\Admin\AppData\Local\Temp\Nrfvvuactxo.exe

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

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

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

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe

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

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 104.20.3.235:443 pastebin.com tcp
US 64.188.16.134:7861 tcp
US 64.188.16.134:7861 tcp

Files

memory/332-0-0x000000007460E000-0x000000007460F000-memory.dmp

memory/332-1-0x0000000000E60000-0x00000000012D0000-memory.dmp

memory/332-2-0x0000000006F80000-0x00000000071A0000-memory.dmp

memory/332-3-0x0000000007750000-0x0000000007CF6000-memory.dmp

memory/332-4-0x0000000007240000-0x00000000072D2000-memory.dmp

memory/332-10-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-5-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-14-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-24-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-26-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-64-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-42-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-40-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-38-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-36-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-34-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-32-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-30-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-28-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-22-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-20-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-18-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-16-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-12-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-8-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-6-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-66-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-62-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-60-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-58-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-56-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-54-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-52-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-50-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-48-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-46-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-44-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-68-0x0000000006F80000-0x000000000719B000-memory.dmp

memory/332-4891-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/332-4892-0x0000000005EB0000-0x0000000005F0C000-memory.dmp

memory/332-4893-0x0000000005F10000-0x0000000005F5C000-memory.dmp

memory/332-4894-0x0000000006160000-0x00000000061C6000-memory.dmp

memory/332-4895-0x00000000065D0000-0x0000000006624000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Nrfvvuactxo.exe.log

MD5 ae5902f6f08a0ccf65d2b2cf5de35baf
SHA1 fed0917857eab4faba95d0e6bc035527a73775fe
SHA256 4ca1e95c28fcf10cfb00e6dd1a952d85e4968614b2f455ee915eca088f09f09b
SHA512 9aef0ff0f00fefad8897ee8de23999aad33bfb243afb5884286aaf7e32a86386585e4fc35b426397f940b0df4426b49d463ab7dbc64f1e06c9ce319cb6385ee7

memory/332-4899-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/2316-4900-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/2316-4901-0x0000000000950000-0x0000000000962000-memory.dmp

memory/2316-4902-0x0000000004EC0000-0x0000000004F5C000-memory.dmp

memory/2316-4903-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/3684-4904-0x0000000002E60000-0x0000000002E96000-memory.dmp

memory/3684-4905-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/3684-4906-0x0000000005A30000-0x000000000605A000-memory.dmp

memory/3684-4907-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/3684-4908-0x00000000059C0000-0x00000000059E2000-memory.dmp

memory/3684-4914-0x00000000060D0000-0x0000000006136000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2ihcu3ec.tna.ps1

MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

memory/3684-4918-0x00000000061B0000-0x0000000006507000-memory.dmp

memory/3684-4919-0x0000000006670000-0x000000000668E000-memory.dmp

memory/3684-4920-0x00000000066A0000-0x00000000066EC000-memory.dmp

memory/3684-4921-0x0000000007610000-0x0000000007644000-memory.dmp

memory/3684-4922-0x000000006F6D0000-0x000000006F71C000-memory.dmp

memory/3684-4931-0x0000000007850000-0x000000000786E000-memory.dmp

memory/3684-4932-0x0000000007880000-0x0000000007924000-memory.dmp

memory/3684-4933-0x0000000008000000-0x000000000867A000-memory.dmp

memory/3684-4934-0x00000000079C0000-0x00000000079DA000-memory.dmp

memory/3684-4935-0x0000000007A30000-0x0000000007A3A000-memory.dmp

memory/3684-4936-0x0000000007C60000-0x0000000007CF6000-memory.dmp

memory/3684-4937-0x0000000007BD0000-0x0000000007BE1000-memory.dmp

memory/3684-4938-0x0000000007C00000-0x0000000007C0E000-memory.dmp

memory/3684-4939-0x0000000007C10000-0x0000000007C25000-memory.dmp

memory/3684-4940-0x0000000007D20000-0x0000000007D3A000-memory.dmp

memory/3684-4941-0x0000000007D00000-0x0000000007D08000-memory.dmp

memory/3684-4944-0x0000000074600000-0x0000000074DB1000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

MD5 ac4917a885cf6050b1a483e4bc4d2ea5
SHA1 b1c0a9f27bd21c6bbb8e9be70db8777b4a2a640f
SHA256 e39062a62c3c7617feeeff95ea8a0be51104a0d36f46e44eea22556fda74d8d9
SHA512 092c67a3ecae1d187cad72a8ea1ea37cb78a0cf79c2cd7fb88953e5990669a2e871267015762fd46d274badb88ac0c1d73b00f1df7394d89bed48a3a45c2ba3d

memory/3016-4954-0x0000000005840000-0x0000000005B97000-memory.dmp

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

MD5 6a2324bdd963058141dbe12b4ada4a4b
SHA1 502d935f9bea1a5f2b1c83f84ce8c5bf1adeda31
SHA256 28f53bd9299dadd390aaa27c2092265fb8b7842c8c651349d5e12009cdcc2b45
SHA512 3362a76c196935800af69656bac64fabab975e702a7b440f173d9362df8ec39ccefe234f0435d85d2edcf7afdeacf32d9805505a444780d31b27ef67cb56675e

memory/3016-4956-0x000000006F6D0000-0x000000006F71C000-memory.dmp

memory/2316-4966-0x0000000006830000-0x000000000683A000-memory.dmp

memory/2316-4967-0x0000000074600000-0x0000000074DB1000-memory.dmp

memory/2316-4968-0x0000000006A40000-0x0000000006A4C000-memory.dmp

memory/2316-4969-0x0000000074600000-0x0000000074DB1000-memory.dmp