Malware Analysis Report

2025-03-15 07:22

Sample ID 241111-y9p2savlby
Target a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c
SHA256 a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c
Tags
macro xlm discovery
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

a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c

Threat Level: Known bad

The file a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c was found to be: Known bad.

Malicious Activity Summary

macro xlm discovery

Process spawned unexpected child process

Suspicious Office macro

System Location Discovery: System Language Discovery

Enumerates system info in registry

Suspicious use of SetWindowsHookEx

Checks processor information in registry

Suspicious use of FindShellTrayWindow

Suspicious behavior: AddClipboardFormatListener

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-11 20:29

Signatures

Suspicious Office macro

macro xlm
Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-11 20:29

Reported

2024-11-11 20:31

Platform

win7-20241010-en

Max time kernel

120s

Max time network

121s

Command Line

"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm

Signatures

Process spawned unexpected child process

Description Indicator Process Target
Parent C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE is not expected to spawn this process N/A C:\Windows\SysWow64\regsvr32.exe C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWow64\regsvr32.exe N/A

Enumerates system info in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE N/A

Suspicious behavior: AddClipboardFormatListener

Description Indicator Process Target
N/A N/A C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE N/A

Processes

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE

"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm

C:\Windows\SysWow64\regsvr32.exe

C:\Windows\SysWow64\regsvr32.exe -s ..\rfs.dll

Network

Country Destination Domain Proto
US 8.8.8.8:53 beetle-j.jp udp
JP 219.100.169.159:80 beetle-j.jp tcp
US 8.8.8.8:53 brutobrasil.com.br udp
US 209.126.103.109:443 brutobrasil.com.br tcp
US 209.126.103.109:443 brutobrasil.com.br tcp
US 209.126.103.109:443 brutobrasil.com.br tcp
US 209.126.103.109:443 brutobrasil.com.br tcp
US 8.8.8.8:53 e3technology.in udp
US 3.33.130.190:80 e3technology.in tcp

Files

memory/1192-1-0x000000007263D000-0x0000000072648000-memory.dmp

memory/1192-0-0x000000005FFF0000-0x0000000060000000-memory.dmp

C:\Users\Admin\rfs.dll

MD5 e89f75f918dbdcee28604d4e09dd71d7
SHA1 f9d9055e9878723a12063b47d4a1a5f58c3eb1e9
SHA256 6dc9c7fc93bb488bb0520a6c780a8d3c0fb5486a4711aca49b4c53fac7393023
SHA512 8df0ab2e3679b64a6174deff4259ae5680f88e3ae307e0ea2dfff88ec4ba14f3477c9fe3a5aa5da3a8e857601170a5108ed75f6d6975958ac7a314e4a336aed0

memory/1192-7-0x000000007263D000-0x0000000072648000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-11 20:29

Reported

2024-11-11 20:31

Platform

win10v2004-20241007-en

Max time kernel

133s

Max time network

137s

Command Line

"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm"

Signatures

Process spawned unexpected child process

Description Indicator Process Target
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process N/A C:\Windows\SysWow64\regsvr32.exe C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWow64\regsvr32.exe N/A

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A
Key opened \REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0 C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A

Enumerates system info in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\Hardware\Description\System\BIOS C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A

Suspicious behavior: AddClipboardFormatListener

Description Indicator Process Target
N/A N/A C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A

Suspicious use of FindShellTrayWindow

Description Indicator Process Target
N/A N/A C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A
N/A N/A C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE N/A

Processes

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE

"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\a400494e331bad7b692500e84505d5c675f490d025be0546d020c249f0236a6c.xlsm"

C:\Windows\SysWow64\regsvr32.exe

C:\Windows\SysWow64\regsvr32.exe -s ..\rfs.dll

Network

Country Destination Domain Proto
US 8.8.8.8:53 roaming.officeapps.live.com udp
NL 52.109.89.19:443 roaming.officeapps.live.com tcp
US 8.8.8.8:53 beetle-j.jp udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 18.89.109.52.in-addr.arpa udp
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
JP 219.100.169.159:80 beetle-j.jp tcp
US 8.8.8.8:53 19.89.109.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 20.160.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 brutobrasil.com.br udp
US 209.126.103.109:443 brutobrasil.com.br tcp
US 8.8.8.8:53 159.169.100.219.in-addr.arpa udp
US 8.8.8.8:53 109.103.126.209.in-addr.arpa udp
US 8.8.8.8:53 23.149.64.172.in-addr.arpa udp
US 8.8.8.8:53 www.brutobrasil.com.br udp
US 209.126.103.109:443 www.brutobrasil.com.br tcp
US 8.8.8.8:53 e3technology.in udp
US 15.197.148.33:80 e3technology.in tcp
US 8.8.8.8:53 33.148.197.15.in-addr.arpa udp
US 8.8.8.8:53 8.179.89.13.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 200.163.202.172.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 11.227.111.52.in-addr.arpa udp

Files

memory/3560-1-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp

memory/3560-0-0x00007FFFCA4CD000-0x00007FFFCA4CE000-memory.dmp

memory/3560-4-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp

memory/3560-3-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp

memory/3560-5-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp

memory/3560-2-0x00007FFF8A4B0000-0x00007FFF8A4C0000-memory.dmp

memory/3560-9-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-11-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-15-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-14-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-16-0x00007FFF87DF0000-0x00007FFF87E00000-memory.dmp

memory/3560-13-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-17-0x00007FFF87DF0000-0x00007FFF87E00000-memory.dmp

memory/3560-12-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-19-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-20-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-18-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-10-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-8-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-7-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-6-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

C:\Users\Admin\rfs.dll

MD5 e89f75f918dbdcee28604d4e09dd71d7
SHA1 f9d9055e9878723a12063b47d4a1a5f58c3eb1e9
SHA256 6dc9c7fc93bb488bb0520a6c780a8d3c0fb5486a4711aca49b4c53fac7393023
SHA512 8df0ab2e3679b64a6174deff4259ae5680f88e3ae307e0ea2dfff88ec4ba14f3477c9fe3a5aa5da3a8e857601170a5108ed75f6d6975958ac7a314e4a336aed0

memory/3560-43-0x00007FFFCA4CD000-0x00007FFFCA4CE000-memory.dmp

memory/3560-44-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-45-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

memory/3560-46-0x00007FFFCA430000-0x00007FFFCA625000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\b8ab77100df80ab2.customDestinations-ms

MD5 98f6b43c2cf68c322d3a77b73c747a8a
SHA1 4d6b3d8e8baf2f09b87fff135dc13808733c6d2b
SHA256 a5ebbdc558b8d9e9efb49dae6f3cb37df0493cbb82d9447ead6ea0cbfe8b0d1d
SHA512 abd27876104975e9595e9c32a90effb3e246bdaa194fd556b8b24bc824a89f35193ba0eecebe9382c0a7c32608a90e0c6aa36f1c1e0eaf07bfdd51aad88d5a19