Malware Analysis Report

2025-08-05 19:42

Sample ID 240507-ykm6wscf81
Target b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a
SHA256 b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a
Tags
stealc discovery spyware 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

b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a

Threat Level: Known bad

The file b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a was found to be: Known bad.

Malicious Activity Summary

stealc discovery spyware stealer

Stealc

Downloads MZ/PE file

Reads user/profile data of web browsers

Loads dropped DLL

Reads data files stored by FTP clients

Accesses cryptocurrency files/wallets, possible credential harvesting

Checks installed software on the system

Enumerates physical storage devices

Program crash

Unsigned PE

Checks processor information in registry

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-07 19:50

Signatures

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-07 19:50

Reported

2024-05-07 19:53

Platform

win11-20240419-en

Max time kernel

146s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe"

Signatures

Stealc

stealer stealc

Downloads MZ/PE file

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Checks installed software on the system

discovery

Enumerates physical storage devices

Checks processor information in registry

Description Indicator Process Target
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe N/A
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe

"C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3788 -ip 3788

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3788 -s 2468

Network

Country Destination Domain Proto
DE 185.172.128.151:80 185.172.128.151 tcp
US 8.8.8.8:53 151.128.172.185.in-addr.arpa udp

Files

memory/3788-1-0x0000000002D10000-0x0000000002E10000-memory.dmp

memory/3788-2-0x0000000002F60000-0x0000000002F87000-memory.dmp

memory/3788-3-0x0000000000400000-0x000000000063B000-memory.dmp

memory/3788-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

memory/3788-52-0x0000000000400000-0x0000000002AFE000-memory.dmp

C:\ProgramData\nss3.dll

MD5 1cc453cdf74f31e4d913ff9c10acdde2
SHA1 6e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
SHA512 dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

C:\ProgramData\mozglue.dll

MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

C:\ProgramData\Are.docx

MD5 a33e5b189842c5867f46566bdbf7a095
SHA1 e1c06359f6a76da90d19e8fd95e79c832edb3196
SHA256 5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454
SHA512 f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b

memory/3788-82-0x0000000002F60000-0x0000000002F87000-memory.dmp

memory/3788-83-0x0000000000400000-0x000000000063B000-memory.dmp

memory/3788-81-0x0000000000400000-0x0000000002AFE000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-07 19:50

Reported

2024-05-07 19:53

Platform

win10v2004-20240426-en

Max time kernel

142s

Max time network

108s

Command Line

"C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe"

Signatures

Stealc

stealer stealc

Downloads MZ/PE file

Reads data files stored by FTP clients

spyware stealer

Reads user/profile data of web browsers

spyware stealer

Accesses cryptocurrency files/wallets, possible credential harvesting

spyware

Checks installed software on the system

discovery

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe

"C:\Users\Admin\AppData\Local\Temp\b40400bbb2dfc39bdebeb77bf2f2d3b5a59c38d06cfcb63b8594a62019eb313a.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 740 -ip 740

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 740 -s 2112

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 77.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 133.32.126.40.in-addr.arpa udp
NL 23.62.61.72:443 www.bing.com tcp
US 8.8.8.8:53 13.86.106.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 72.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 205.47.74.20.in-addr.arpa udp
DE 185.172.128.151:80 185.172.128.151 tcp
US 8.8.8.8:53 151.128.172.185.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 31.121.18.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp

Files

memory/740-3-0x0000000000400000-0x000000000063B000-memory.dmp

memory/740-2-0x0000000002E80000-0x0000000002EA7000-memory.dmp

memory/740-1-0x0000000002C80000-0x0000000002D80000-memory.dmp

memory/740-4-0x0000000061E00000-0x0000000061EF3000-memory.dmp

C:\ProgramData\nss3.dll

MD5 1cc453cdf74f31e4d913ff9c10acdde2
SHA1 6e85eae544d6e965f15fa5c39700fa7202f3aafe
SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
SHA512 dd9ff4e06b00dc831439bab11c10e9b2ae864ea6e780d3835ea7468818f35439f352ef137da111efcdf2bb6465f6ca486719451bf6cf32c6a4420a56b1d64571

C:\ProgramData\mozglue.dll

MD5 c8fd9be83bc728cc04beffafc2907fe9
SHA1 95ab9f701e0024cedfbd312bcfe4e726744c4f2e
SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
SHA512 fbb446f4a27ef510e616caad52945d6c9cc1fd063812c41947e579ec2b54df57c6dc46237ded80fca5847f38cbe1747a6c66a13e2c8c19c664a72be35eb8b040

C:\ProgramData\Are.docx

MD5 a33e5b189842c5867f46566bdbf7a095
SHA1 e1c06359f6a76da90d19e8fd95e79c832edb3196
SHA256 5abf8e3d1f78de7b09d7f6fb87f9e80e60caacf13ef3c1289665653dacd7c454
SHA512 f2ad3812ec9b915e9618539b0f103f2e9acaad25fbbacd84941c954ce070af231324e83a4621e951c1dbae8d40d50410954e40dd52bbd46e34c54b0d1957407b

memory/740-80-0x0000000000400000-0x0000000002AFE000-memory.dmp

memory/740-82-0x0000000000400000-0x000000000063B000-memory.dmp

memory/740-81-0x0000000000400000-0x0000000002AFE000-memory.dmp