Malware Analysis Report

2024-10-10 09:55

Sample ID 240711-t82lzavfkj
Target dead.payload
SHA256 7e45b79940116f8a1de3a75f82e5209d0279d99479a24778e1590dd739b6ddf8
Tags
umbral stealer
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

7e45b79940116f8a1de3a75f82e5209d0279d99479a24778e1590dd739b6ddf8

Threat Level: Known bad

The file dead.payload was found to be: Known bad.

Malicious Activity Summary

umbral stealer

Detect Umbral payload

Umbral

Umbral family

Unsigned PE

Checks processor information in registry

Opens file in notepad (likely ransom note)

Suspicious behavior: AddClipboardFormatListener

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Enumerates system info in registry

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-11 16:44

Signatures

Detect Umbral payload

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

Umbral family

umbral

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-11 16:44

Reported

2024-07-11 16:45

Platform

win10v2004-20240709-en

Max time kernel

30s

Max time network

15s

Command Line

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

Signatures

Detect Umbral payload

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

Umbral

stealer umbral

Checks processor information in registry

Description Indicator Process Target
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
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz 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

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-1176886754-713327781-2233697964-1000_Classes\Local Settings C:\Windows\system32\OpenWith.exe N/A

Opens file in notepad (likely ransom note)

ransomware
Description Indicator Process Target
N/A N/A C:\Windows\system32\NOTEPAD.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 behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Windows\system32\OpenWith.exe N/A

Suspicious use of SetWindowsHookEx

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
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
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
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
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
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
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3832 wrote to memory of 3864 N/A C:\Windows\system32\OpenWith.exe C:\Windows\system32\NOTEPAD.EXE
PID 3832 wrote to memory of 3864 N/A C:\Windows\system32\OpenWith.exe C:\Windows\system32\NOTEPAD.EXE

Processes

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

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

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

"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\Desktop\CompleteStop.xlsx"

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

C:\Windows\system32\NOTEPAD.EXE

"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\CompressCopy.pcx

Network

Country Destination Domain Proto
US 8.8.8.8:53 84.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 25.140.123.92.in-addr.arpa udp
US 8.8.8.8:53 240.76.109.52.in-addr.arpa udp
US 8.8.8.8:53 92.16.208.104.in-addr.arpa udp
US 8.8.8.8:53 udp
N/A 20.114.59.183:443 tcp

Files

memory/552-0-0x000001CFD6160000-0x000001CFD61A6000-memory.dmp

memory/552-1-0x00007FFA08DB3000-0x00007FFA08DB5000-memory.dmp

memory/552-2-0x00007FFA08DB0000-0x00007FFA09871000-memory.dmp

memory/552-3-0x00007FFA08DB0000-0x00007FFA09871000-memory.dmp

memory/3076-4-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-6-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-5-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-7-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-8-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-9-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

memory/3076-10-0x00007FF9E4C40000-0x00007FF9E4C50000-memory.dmp

memory/3076-11-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

memory/3076-12-0x00007FF9E4C40000-0x00007FF9E4C50000-memory.dmp

memory/3076-13-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

memory/3076-14-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

memory/3076-15-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Office\Recent\index.dat

MD5 ab7d2c1cbbc2d7b4f7e5bb1c8c6ea2bb
SHA1 3d371c9c52babc38d75ffbb6c2b7a2166a712e89
SHA256 871bc318ff1901a0c531c49cb2cfcfe20356910e06d962db53b1d9f9cbb6e25f
SHA512 3f10a61d85dc0f659fbf250442ad141e2093ce18316e3868d3bd2fda8e02075b0cd32a02e38d4a2789efe256a2cd339e838408cecab5483fee462b11a4f07a5f

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

MD5 d7570734da99e97b5b1f9c0ed769f219
SHA1 b5c70e166289dba00275d3c5ec2f93c0be273089
SHA256 c4cbff22972713643c29c6751d82cf167e5623d6098e184cec217c2c86721e92
SHA512 e1cd99aeead32b449f361cf216a7ff2734ed7bbf31207d0e7f6de1c773fb7efcb9c344f29abb275a9686a930f246290d66631e97831582a50922bc0c1e9dff48

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

MD5 244fc07e9d3169e926525db86974cb59
SHA1 600e2e6c0af8ccdd9949b4aa8d68bec5d64a2a72
SHA256 f36dcab0e40f5d88dbc2e0cf8f6e6f5934494e450da8d5157a182eb99c7f8b2f
SHA512 16ee5ee69853343c35a16ced5fbbbcff6ad65fe6dbc7c5fc8df0bf4812be62e6a4a9b949645dcf41d5c38ebfe24002d47abf8781413733d2817e9875a290cb56

memory/3076-60-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-59-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-63-0x00007FFA08C90000-0x00007FFA08F60000-memory.dmp

memory/3076-62-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

memory/3076-61-0x00007FF9E71F0000-0x00007FF9E7200000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-11 16:44

Reported

2024-07-11 16:45

Platform

win7-20240708-en

Max time kernel

23s

Max time network

16s

Command Line

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

Signatures

Detect Umbral payload

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

Umbral

stealer umbral

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2988 wrote to memory of 3056 N/A C:\Users\Admin\AppData\Local\Temp\dead.exe C:\Windows\system32\WerFault.exe
PID 2988 wrote to memory of 3056 N/A C:\Users\Admin\AppData\Local\Temp\dead.exe C:\Windows\system32\WerFault.exe
PID 2988 wrote to memory of 3056 N/A C:\Users\Admin\AppData\Local\Temp\dead.exe C:\Windows\system32\WerFault.exe

Processes

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

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

C:\Windows\system32\WerFault.exe

C:\Windows\system32\WerFault.exe -u -p 2988 -s 544

Network

N/A

Files

memory/2988-0-0x000007FEF5C93000-0x000007FEF5C94000-memory.dmp

memory/2988-1-0x0000000000F60000-0x0000000000FA6000-memory.dmp

memory/2988-2-0x000007FEF5C93000-0x000007FEF5C94000-memory.dmp