Malware Analysis Report

2024-11-13 17:16

Sample ID 231210-avfb2abaem
Target 91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.zip
SHA256 d74c35a72f27144306192ee3ddbfaad92edc42658d5a240c61bd01e2abe283d4
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

d74c35a72f27144306192ee3ddbfaad92edc42658d5a240c61bd01e2abe283d4

Threat Level: Known bad

The file 91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.zip was found to be: Known bad.

Malicious Activity Summary

systembc trojan

SystemBC

Blocklisted process makes network request

Program crash

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-10 00:31

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-10 00:31

Reported

2023-12-10 00:34

Platform

win7-20231201-en

Max time kernel

140s

Max time network

132s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.dll,#1

Signatures

SystemBC

trojan systembc

Blocklisted process makes network request

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2148 wrote to memory of 2904 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\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.dll,#1

Network

Country Destination Domain Proto
US 64.176.214.51:443 tcp

Files

memory/2904-0-0x0000000000700000-0x000000000077F000-memory.dmp

memory/2904-1-0x0000000000170000-0x0000000000176000-memory.dmp

memory/2904-2-0x0000000000190000-0x0000000000197000-memory.dmp

memory/2904-3-0x0000000000700000-0x000000000077F000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-10 00:31

Reported

2023-12-10 00:34

Platform

win10v2004-20231127-en

Max time kernel

125s

Max time network

131s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.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 3716 wrote to memory of 2176 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3716 wrote to memory of 2176 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3716 wrote to memory of 2176 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\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91c7cded43648845e8acd59f3fafb6ce4fd5af517eb81a8e12e8c6640c07ff0f.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2176 -ip 2176

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2176 -s 632

Network

Country Destination Domain Proto
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 48.254.221.88.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 198.1.85.104.in-addr.arpa udp
US 8.8.8.8:53 43.58.199.20.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.200:443 g.bing.com tcp
US 8.8.8.8:53 200.197.79.204.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 8.8.8.8:53 158.240.127.40.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 146.99.217.23.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 209.143.182.52.in-addr.arpa udp

Files

memory/2176-0-0x0000000001530000-0x0000000001536000-memory.dmp

memory/2176-1-0x0000000001550000-0x0000000001557000-memory.dmp

memory/2176-2-0x0000000000400000-0x000000000047F000-memory.dmp

memory/2176-3-0x0000000001530000-0x0000000001536000-memory.dmp