Malware Analysis Report

2025-08-05 10:58

Sample ID 241109-aayymssjfy
Target 1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN
SHA256 1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dcc
Tags
discovery persistence spyware stealer
score
7/10

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
7/10

SHA256

1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dcc

Threat Level: Shows suspicious behavior

The file 1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN was found to be: Shows suspicious behavior.

Malicious Activity Summary

discovery persistence spyware stealer

Executes dropped EXE

Loads dropped DLL

Reads user/profile data of web browsers

Adds Run key to start application

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-09 00:01

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-09 00:01

Reported

2024-11-09 00:03

Platform

win7-20240903-en

Max time kernel

120s

Max time network

16s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Public\Microsoft Build\Isass.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-3063565911-2056067323-3330884624-1000\Software\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe" C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe" C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A

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\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Public\Microsoft Build\Isass.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A
N/A N/A C:\Users\Public\Microsoft Build\Isass.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe

"C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe"

C:\Users\Public\Microsoft Build\Isass.exe

"C:\Users\Public\Microsoft Build\Isass.exe"

Network

N/A

Files

C:\Users\Public\Microsoft Build\Isass.exe

MD5 cba407a414f71048711865525583a320
SHA1 6722724f204ef6bd9a3937e04c4b2ab8a644d8b1
SHA256 1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dcc
SHA512 1f00e7a3a33bdafb71dc0d74f9b646b555b6b733da47f5978061118c48f382023d0b9014217651bca07d7fa2112f038a1c16960c60f3283a3b292cf347a62fcc

memory/3056-8-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/3056-12-0x0000000004610000-0x00000000058B8000-memory.dmp

memory/3056-13-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-15-0x00000000003B0000-0x00000000003B1000-memory.dmp

memory/2312-14-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/3056-9-0x0000000004610000-0x00000000058B8000-memory.dmp

memory/2312-16-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-17-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-20-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-21-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-28-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-29-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-37-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-38-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-44-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-45-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-52-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/2312-53-0x0000000004630000-0x00000000058D8000-memory.dmp

memory/2312-54-0x0000000000400000-0x00000000016A8000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-09 00:01

Reported

2024-11-09 00:03

Platform

win10v2004-20241007-en

Max time kernel

120s

Max time network

95s

Command Line

"C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe"

Signatures

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Public\Microsoft Build\Isass.exe N/A

Reads user/profile data of web browsers

spyware stealer

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe" C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Isass.exe = "C:\\Users\\Public\\Microsoft Build\\Isass.exe" C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A

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\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Public\Microsoft Build\Isass.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe

"C:\Users\Admin\AppData\Local\Temp\1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dccN.exe"

C:\Users\Public\Microsoft Build\Isass.exe

"C:\Users\Public\Microsoft Build\Isass.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 149.220.183.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 133.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 241.42.69.40.in-addr.arpa udp
US 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp

Files

C:\Users\Public\Microsoft Build\Isass.exe

MD5 cba407a414f71048711865525583a320
SHA1 6722724f204ef6bd9a3937e04c4b2ab8a644d8b1
SHA256 1cb4224c524447bf801b2b19e23f48f9ad083bbbc9f89c24d418e213f99b6dcc
SHA512 1f00e7a3a33bdafb71dc0d74f9b646b555b6b733da47f5978061118c48f382023d0b9014217651bca07d7fa2112f038a1c16960c60f3283a3b292cf347a62fcc

memory/4648-2-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4648-3-0x0000000001D40000-0x0000000001D41000-memory.dmp

memory/4744-6-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-7-0x00000000001E0000-0x00000000001E1000-memory.dmp

memory/4648-9-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-10-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-11-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-14-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-15-0x0000000000400000-0x00000000016A8000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe

MD5 e10d4b7a6adf1aafba381a2a88bfb50b
SHA1 14e38a0c03ecadac18063a9e8c8ec84295352531
SHA256 d9d2e84d27db85f76e8eb4316f258460fdc2977286b4f344026181109c4f72bd
SHA512 4fbc9242f0fb14dbbe83ad3bb6962f2baa45ef716d67c927508b78fe176cca64075a9474e3c3716916e332166355f68e86d70b277274bc1bb4ae7a726b3aa160

memory/4744-19-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-20-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-25-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-29-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-35-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-36-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-43-0x0000000000400000-0x00000000016A8000-memory.dmp

memory/4744-44-0x0000000000400000-0x00000000016A8000-memory.dmp