Malware Analysis Report

2024-11-16 13:26

Sample ID 240805-gcfcmsybkk
Target fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3
SHA256 fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3
Tags
urelas discovery trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3

Threat Level: Known bad

The file fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3 was found to be: Known bad.

Malicious Activity Summary

urelas discovery trojan

Urelas family

Urelas

Deletes itself

Executes dropped EXE

Loads dropped DLL

Checks computer location settings

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-05 05:39

Signatures

Urelas family

urelas

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-05 05:39

Reported

2024-08-05 05:41

Platform

win7-20240708-en

Max time kernel

117s

Max time network

117s

Command Line

"C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe"

Signatures

Urelas

trojan urelas

Deletes itself

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\biudfw.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe

"C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe"

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

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

C:\Windows\SysWOW64\cmd.exe

cmd /c ""C:\Users\Admin\AppData\Local\Temp\sanfdr.bat" "

Network

Country Destination Domain Proto
KR 218.54.47.76:11120 tcp
KR 218.54.47.74:11150 tcp
KR 218.54.47.76:11170 tcp
KR 218.54.47.77:11150 tcp

Files

memory/2372-0-0x0000000000920000-0x0000000000966000-memory.dmp

\Users\Admin\AppData\Local\Temp\biudfw.exe

MD5 cb960aa88ae29f3e1ebd988977a4dc8d
SHA1 eb2023e1ca869038e44218f368173396761fdfd0
SHA256 e4b14c97d5338a77835267f54a2c237bb83f9ef7610a4fe12b7561b37e9161d9
SHA512 c9eabb2000eabaafac5e2b3c75198df11baba6c86ea0bd7acbea058673ba3cfbbcdf5ce3cb101cf1f1c805b76e83505e93d70d1846e76919c5c7737e3690f9ae

memory/2372-6-0x0000000001DF0000-0x0000000001E36000-memory.dmp

memory/2744-10-0x0000000001020000-0x0000000001066000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\sanfdr.bat

MD5 37e6cd981b0e855d058d9b60ae0b2078
SHA1 f6fe4efa5e4a7f584b7c6aceb7618c41fa2ed0e5
SHA256 8febbb34402fc2642eb69b80ce7b2658a701b51e4c8c59cca8eb40e00d2c6989
SHA512 26460eb87498cf12615a5958ba568d26d9dec49a504745af06fd53c4d9e4bcca46d64003fdccbb3b3de8429a72fe3545d9192558a476bc257d1b1fc4fa9ba191

memory/2372-18-0x0000000000920000-0x0000000000966000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\golfinfo.ini

MD5 ac5e84ed8031d66a9fcd5e472ba8091b
SHA1 06303add604104d6abbb69458f89773c066b470c
SHA256 3a3cfa6f4786dab0ac8bc76204948f32a3a2cbd094922f87c251ec80d22baae5
SHA512 7bf829102a70a1304dae435b8ae3c9ef9a925af7e995fe381d80730f4f702e1fd2a0a1b6a3a4b4667925f5bb95c897166a8fc0f52d3171d9cdba0bf09b53f152

memory/2744-21-0x0000000001020000-0x0000000001066000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-05 05:39

Reported

2024-08-05 05:41

Platform

win10v2004-20240802-en

Max time kernel

93s

Max time network

94s

Command Line

"C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe"

Signatures

Urelas

trojan urelas

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-4182098368-2521458979-3782681353-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe N/A

Executes dropped EXE

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

Enumerates physical storage devices

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\biudfw.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\cmd.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe

"C:\Users\Admin\AppData\Local\Temp\fd2b764bb57ea391ba5faf686914d5fc11ef5227ba71f101839df05bcc590cb3.exe"

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

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

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\sanfdr.bat" "

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 68.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
KR 218.54.47.76:11120 tcp
KR 218.54.47.74:11150 tcp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 192.142.123.92.in-addr.arpa udp
KR 218.54.47.76:11170 tcp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
KR 218.54.47.77:11150 tcp
US 8.8.8.8:53 81.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/3600-0-0x0000000000900000-0x0000000000946000-memory.dmp

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

MD5 b75cd0b25e65a3cd629b300dce5e7eb3
SHA1 4199cda5190827b6461fc163fab9c8785cb02a59
SHA256 ed6f1ae09cd067445280f47750e66d4e2fd81d4e3922ff0195d0c07e49c398db
SHA512 89b2c2d994229cc7b50cfbc80835d780e92c514445071e110ba711b1e56daa556bd9e2518a27e88bac1d57f6ff0552e62c593c19774e4abd241c45f1b1f76743

memory/1808-15-0x00000000009D0000-0x0000000000A16000-memory.dmp

memory/3600-17-0x0000000000900000-0x0000000000946000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\sanfdr.bat

MD5 37e6cd981b0e855d058d9b60ae0b2078
SHA1 f6fe4efa5e4a7f584b7c6aceb7618c41fa2ed0e5
SHA256 8febbb34402fc2642eb69b80ce7b2658a701b51e4c8c59cca8eb40e00d2c6989
SHA512 26460eb87498cf12615a5958ba568d26d9dec49a504745af06fd53c4d9e4bcca46d64003fdccbb3b3de8429a72fe3545d9192558a476bc257d1b1fc4fa9ba191

C:\Users\Admin\AppData\Local\Temp\golfinfo.ini

MD5 ac5e84ed8031d66a9fcd5e472ba8091b
SHA1 06303add604104d6abbb69458f89773c066b470c
SHA256 3a3cfa6f4786dab0ac8bc76204948f32a3a2cbd094922f87c251ec80d22baae5
SHA512 7bf829102a70a1304dae435b8ae3c9ef9a925af7e995fe381d80730f4f702e1fd2a0a1b6a3a4b4667925f5bb95c897166a8fc0f52d3171d9cdba0bf09b53f152

memory/1808-20-0x00000000009D0000-0x0000000000A16000-memory.dmp