Malware Analysis Report

2025-04-03 09:43

Sample ID 230411-k7w6esdb9w
Target 37887c9dce52b5f8926515cd07e14319.dll
SHA256 5bd7522d5fc9974eec5366697ee99480abb6910302d0250838022d6758024fa8
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

5bd7522d5fc9974eec5366697ee99480abb6910302d0250838022d6758024fa8

Threat Level: Known bad

The file 37887c9dce52b5f8926515cd07e14319.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

2023-04-11 09:15

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-04-11 09:15

Reported

2023-04-11 09:17

Platform

win7-20230220-en

Max time kernel

30s

Max time network

33s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\37887c9dce52b5f8926515cd07e14319.dll,#1

Signatures

SystemBC

trojan systembc

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1368 wrote to memory of 1580 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\37887c9dce52b5f8926515cd07e14319.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\37887c9dce52b5f8926515cd07e14319.dll,#1

Network

N/A

Files

memory/1580-54-0x0000000010000000-0x0000000010179000-memory.dmp

memory/1580-55-0x0000000010000000-0x0000000010179000-memory.dmp

memory/1580-56-0x00000000008C0000-0x00000000009D3000-memory.dmp

memory/1580-57-0x00000000001B0000-0x00000000001B4000-memory.dmp

memory/1580-58-0x00000000001F0000-0x00000000001F1000-memory.dmp

memory/1580-60-0x0000000000230000-0x0000000000231000-memory.dmp

memory/1580-59-0x0000000000240000-0x0000000000241000-memory.dmp

memory/1580-61-0x00000000001D0000-0x00000000001D5000-memory.dmp

memory/1580-62-0x0000000000210000-0x0000000000212000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-04-11 09:15

Reported

2023-04-11 09:17

Platform

win10v2004-20230220-en

Max time kernel

119s

Max time network

126s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\37887c9dce52b5f8926515cd07e14319.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 1872 wrote to memory of 2704 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1872 wrote to memory of 2704 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1872 wrote to memory of 2704 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\37887c9dce52b5f8926515cd07e14319.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\37887c9dce52b5f8926515cd07e14319.dll,#1

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2704 -ip 2704

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2704 -s 572

Network

Country Destination Domain Proto
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 254.33.24.67.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 76.38.195.152.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
IE 20.54.89.15:443 tcp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 2.36.159.162.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 64.13.109.52.in-addr.arpa udp
US 8.8.8.8:53 240.81.21.72.in-addr.arpa udp
NL 173.223.113.164:443 tcp
NL 173.223.113.131:80 tcp
US 131.253.33.203:80 tcp
US 93.184.221.240:80 tcp

Files

memory/2704-133-0x0000000010000000-0x0000000010179000-memory.dmp

memory/2704-134-0x0000000001650000-0x0000000001763000-memory.dmp

memory/2704-135-0x0000000001500000-0x0000000001504000-memory.dmp