Malware Analysis Report

2025-01-02 12:18

Sample ID 240715-p75vsaveqb
Target bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b
SHA256 bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b
Tags
stealc default discovery spyware stealer
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

bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b

Threat Level: Known bad

The file bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b was found to be: Known bad.

Malicious Activity Summary

stealc default discovery spyware stealer

Stealc

Downloads MZ/PE file

Loads dropped DLL

Reads user/profile data of web browsers

Reads data files stored by FTP clients

Accesses cryptocurrency files/wallets, possible credential harvesting

Checks installed software on the system

Suspicious use of SetThreadContext

Checks processor information in registry

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-07-15 12:59

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-07-15 12:59

Reported

2024-07-15 13:46

Platform

win10v2004-20240709-en

Max time kernel

150s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe"

Signatures

Stealc

stealer stealc

Downloads MZ/PE file

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3544 set thread context of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3544 wrote to memory of 4656 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4656 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4656 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 2968 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 2968 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 2968 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1960 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1960 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1960 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4928 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4928 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4928 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1180 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1180 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 1180 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 3544 wrote to memory of 4064 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe

"C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

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
RU 85.28.47.101:80 85.28.47.101 tcp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 101.47.28.85.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 157.123.68.40.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 147.142.123.92.in-addr.arpa udp
US 8.8.8.8:53 22.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

memory/3544-0-0x0000000001420000-0x0000000001421000-memory.dmp

memory/4064-1-0x0000000000400000-0x000000000063C000-memory.dmp

memory/4064-3-0x0000000000400000-0x000000000063C000-memory.dmp

memory/4064-4-0x0000000000400000-0x000000000063C000-memory.dmp

memory/4064-5-0x0000000061E00000-0x0000000061EF3000-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

memory/4064-77-0x0000000000400000-0x000000000063C000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-07-15 12:59

Reported

2024-07-15 13:46

Platform

win11-20240709-en

Max time kernel

90s

Max time network

98s

Command Line

"C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe"

Signatures

Stealc

stealer stealc

Downloads MZ/PE file

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2460 set thread context of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Checks processor information in registry

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0 C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A
Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
PID 2460 wrote to memory of 1244 N/A C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe

"C:\Users\Admin\AppData\Local\Temp\bf79919191223b5ee5fc8c37e8a935ed1fdc9f4c3914e9ffac99294189454c7b.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"

Network

Country Destination Domain Proto
RU 85.28.47.101:80 85.28.47.101 tcp
US 8.8.8.8:53 101.47.28.85.in-addr.arpa udp

Files

memory/2460-0-0x0000000002E10000-0x0000000002E11000-memory.dmp

memory/1244-1-0x0000000000400000-0x000000000063C000-memory.dmp

memory/1244-3-0x0000000000400000-0x000000000063C000-memory.dmp

memory/1244-4-0x0000000000400000-0x000000000063C000-memory.dmp

memory/1244-5-0x0000000061E00000-0x0000000061EF3000-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

memory/1244-77-0x0000000000400000-0x000000000063C000-memory.dmp