Malware Analysis Report

2025-04-03 09:43

Sample ID 230415-kr93cade95
Target tmp
SHA256 4246b1740af95e953c8010a6d99c0ab72622b892bc1dbb955eec4067d90d7763
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

4246b1740af95e953c8010a6d99c0ab72622b892bc1dbb955eec4067d90d7763

Threat Level: Known bad

The file tmp was found to be: Known bad.

Malicious Activity Summary

systembc trojan

SystemBC

Drops file in Windows directory

Program crash

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-04-15 08:51

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2023-04-15 08:51

Reported

2023-04-15 08:53

Platform

win7-20230220-en

Max time kernel

142s

Max time network

116s

Command Line

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

Signatures

SystemBC

trojan systembc

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Tasks\wow64.job C:\Users\Admin\AppData\Local\Temp\tmp.exe N/A
File opened for modification C:\Windows\Tasks\wow64.job C:\Users\Admin\AppData\Local\Temp\tmp.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1500 wrote to memory of 1088 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\Temp\tmp.exe
PID 1500 wrote to memory of 1088 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\Temp\tmp.exe
PID 1500 wrote to memory of 1088 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\Temp\tmp.exe
PID 1500 wrote to memory of 1088 N/A C:\Windows\system32\taskeng.exe C:\Users\Admin\AppData\Local\Temp\tmp.exe

Processes

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

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

C:\Windows\system32\taskeng.exe

taskeng.exe {B8EEA0DA-3866-47D1-AD3F-000910D46EB6} S-1-5-18:NT AUTHORITY\System:Service:

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

C:\Users\Admin\AppData\Local\Temp\tmp.exe start

Network

Country Destination Domain Proto
RU 185.215.113.105:4001 tcp

Files

memory/820-57-0x00000000003A0000-0x00000000003A5000-memory.dmp

memory/820-58-0x0000000000400000-0x0000000000B3A000-memory.dmp

memory/1088-66-0x0000000000400000-0x0000000000B3A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-04-15 08:51

Reported

2023-04-15 08:53

Platform

win10v2004-20230220-en

Max time kernel

150s

Max time network

125s

Command Line

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

Signatures

SystemBC

trojan systembc

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Tasks\wow64.job C:\Users\Admin\AppData\Local\Temp\tmp.exe N/A
File opened for modification C:\Windows\Tasks\wow64.job C:\Users\Admin\AppData\Local\Temp\tmp.exe N/A

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\tmp.exe

Processes

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

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

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 3528 -ip 3528

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3528 -s 948

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

C:\Users\Admin\AppData\Local\Temp\tmp.exe start

Network

Country Destination Domain Proto
IE 40.126.31.67:443 tcp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 126.211.247.8.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 73.159.190.20.in-addr.arpa udp
IE 20.54.89.15:443 tcp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 2.36.159.162.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 64.13.109.52.in-addr.arpa udp
US 8.8.8.8:53 8.3.197.209.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
RU 185.215.113.105:4001 tcp
US 8.8.8.8:53 105.113.215.185.in-addr.arpa udp

Files

memory/3528-136-0x0000000002870000-0x0000000002875000-memory.dmp

memory/3528-137-0x0000000000400000-0x0000000000B3A000-memory.dmp

memory/2300-145-0x0000000000400000-0x0000000000B3A000-memory.dmp