Malware Analysis Report

2025-05-05 23:59

Sample ID 230208-w3rkxseb74
Target 1cfd78420793c0fafebf0f4e1a09c1ff.dll
SHA256 329501486d4922ccf3a28e8ecf0046151e7106dc31ea6df33670d0d15d10cf54
Tags
systembc trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

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

329501486d4922ccf3a28e8ecf0046151e7106dc31ea6df33670d0d15d10cf54

Threat Level: Known bad

The file 1cfd78420793c0fafebf0f4e1a09c1ff.dll was found to be: Known bad.

Malicious Activity Summary

systembc trojan

SystemBC

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-02-08 18:27

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-02-08 18:27

Reported

2023-02-08 18:29

Platform

win7-20221111-en

Max time kernel

124s

Max time network

33s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

Signatures

SystemBC

trojan systembc

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1176 wrote to memory of 1716 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

Network

N/A

Files

memory/1716-54-0x0000000000000000-mapping.dmp

memory/1716-55-0x0000000074FA1000-0x0000000074FA3000-memory.dmp

memory/1716-56-0x0000000010000000-0x000000001013B000-memory.dmp

memory/1716-57-0x0000000000930000-0x0000000000A48000-memory.dmp

memory/1716-58-0x00000000001F0000-0x00000000001F4000-memory.dmp

memory/1716-59-0x0000000000930000-0x0000000000A48000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-02-08 18:27

Reported

2023-02-08 18:29

Platform

win10v2004-20221111-en

Max time kernel

143s

Max time network

153s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

Signatures

SystemBC

trojan systembc

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4912 wrote to memory of 4804 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4912 wrote to memory of 4804 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4912 wrote to memory of 4804 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\1cfd78420793c0fafebf0f4e1a09c1ff.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 4804 -ip 4804

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 4804 -s 580

Network

Country Destination Domain Proto
US 72.21.81.240:80 tcp
US 72.21.81.240:80 tcp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 72.21.81.240:80 tcp
NL 104.80.225.205:443 tcp
US 8.8.8.8:53 6.9.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.3.0.4.0.0.3.0.1.3.0.6.2.ip6.arpa udp
US 72.21.81.240:80 tcp

Files

memory/4804-132-0x0000000000000000-mapping.dmp

memory/4804-133-0x0000000010000000-0x000000001013B000-memory.dmp

memory/4804-135-0x00000000012C0000-0x00000000012C4000-memory.dmp

memory/4804-134-0x0000000002CD0000-0x0000000002DE8000-memory.dmp

memory/4804-136-0x0000000002CD0000-0x0000000002DE8000-memory.dmp