Malware Analysis Report

2025-05-28 17:38

Sample ID 221217-pam9gabe3y
Target 6CA5.exe
SHA256 3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e
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

3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e

Threat Level: Known bad

The file 6CA5.exe was found to be: Known bad.

Malicious Activity Summary

systembc trojan

SystemBC

Executes dropped EXE

Drops file in Windows directory

Program crash

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2022-12-17 12:07

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-12-17 12:07

Reported

2022-12-17 12:27

Platform

win7-20220812-en

Max time kernel

1187s

Max time network

1191s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6CA5.exe"

Signatures

SystemBC

trojan systembc

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\mmxrbk\nkih.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Tasks\nkih.job C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A
File opened for modification C:\Windows\Tasks\nkih.job C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1748 wrote to memory of 904 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\mmxrbk\nkih.exe
PID 1748 wrote to memory of 904 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\mmxrbk\nkih.exe
PID 1748 wrote to memory of 904 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\mmxrbk\nkih.exe
PID 1748 wrote to memory of 904 N/A C:\Windows\system32\taskeng.exe C:\ProgramData\mmxrbk\nkih.exe

Processes

C:\Users\Admin\AppData\Local\Temp\6CA5.exe

"C:\Users\Admin\AppData\Local\Temp\6CA5.exe"

C:\Windows\system32\taskeng.exe

taskeng.exe {1D5B761E-E049-44B5-AD14-A0A808448793} S-1-5-18:NT AUTHORITY\System:Service:

C:\ProgramData\mmxrbk\nkih.exe

C:\ProgramData\mmxrbk\nkih.exe start

Network

Country Destination Domain Proto
N/A 109.205.214.18:443 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.72.142:80 142.250.72.142 tcp
N/A 142.250.191.174:80 142.250.191.174 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.72.142:80 142.250.72.142 tcp

Files

memory/1184-54-0x0000000074BB1000-0x0000000074BB3000-memory.dmp

memory/1184-55-0x00000000005FB000-0x0000000000611000-memory.dmp

memory/1184-56-0x0000000000220000-0x0000000000229000-memory.dmp

memory/1184-57-0x0000000000400000-0x0000000000458000-memory.dmp

C:\ProgramData\mmxrbk\nkih.exe

MD5 a533eeaaec1a873d84936633e153dd0a
SHA1 a16f84c4039ddccf9960cee21cb8860f2f1cf34c
SHA256 3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e
SHA512 c599ec24478794dbe3fd1f3124bb93423b610a5d36eb76d625a2401fcc5f368ee40bca9585ba156a06747c593bc415369ae2106ee48b94044a72a59bd1949b79

C:\ProgramData\mmxrbk\nkih.exe

MD5 a533eeaaec1a873d84936633e153dd0a
SHA1 a16f84c4039ddccf9960cee21cb8860f2f1cf34c
SHA256 3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e
SHA512 c599ec24478794dbe3fd1f3124bb93423b610a5d36eb76d625a2401fcc5f368ee40bca9585ba156a06747c593bc415369ae2106ee48b94044a72a59bd1949b79

memory/904-59-0x0000000000000000-mapping.dmp

memory/1184-61-0x00000000005FB000-0x0000000000611000-memory.dmp

memory/904-63-0x000000000061B000-0x0000000000631000-memory.dmp

memory/904-64-0x0000000000400000-0x0000000000458000-memory.dmp

memory/904-65-0x000000000061B000-0x0000000000631000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-12-17 12:07

Reported

2022-12-17 12:27

Platform

win10v2004-20220901-en

Max time kernel

1194s

Max time network

1197s

Command Line

"C:\Users\Admin\AppData\Local\Temp\6CA5.exe"

Signatures

SystemBC

trojan systembc

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\ProgramData\xwkwvj\fnnfwqh.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File created C:\Windows\Tasks\fnnfwqh.job C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A
File opened for modification C:\Windows\Tasks\fnnfwqh.job C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Users\Admin\AppData\Local\Temp\6CA5.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\6CA5.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\6CA5.exe

"C:\Users\Admin\AppData\Local\Temp\6CA5.exe"

C:\ProgramData\xwkwvj\fnnfwqh.exe

C:\ProgramData\xwkwvj\fnnfwqh.exe start

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3704 -ip 3704

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3704 -s 492

Network

Country Destination Domain Proto
N/A 20.189.173.15:443 tcp
N/A 2.18.109.224:443 tcp
N/A 109.205.214.18:443 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.72.142:80 142.250.72.142 tcp
N/A 142.250.191.174:80 142.250.191.174 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.190.110:80 142.250.190.110 tcp
N/A 142.250.72.142:80 142.250.72.142 tcp

Files

memory/3704-132-0x0000000000659000-0x000000000066F000-memory.dmp

memory/3704-133-0x00000000004D0000-0x00000000004D9000-memory.dmp

memory/3704-134-0x0000000000400000-0x0000000000458000-memory.dmp

memory/3704-135-0x0000000000659000-0x000000000066F000-memory.dmp

memory/3704-136-0x00000000004D0000-0x00000000004D9000-memory.dmp

C:\ProgramData\xwkwvj\fnnfwqh.exe

MD5 a533eeaaec1a873d84936633e153dd0a
SHA1 a16f84c4039ddccf9960cee21cb8860f2f1cf34c
SHA256 3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e
SHA512 c599ec24478794dbe3fd1f3124bb93423b610a5d36eb76d625a2401fcc5f368ee40bca9585ba156a06747c593bc415369ae2106ee48b94044a72a59bd1949b79

C:\ProgramData\xwkwvj\fnnfwqh.exe

MD5 a533eeaaec1a873d84936633e153dd0a
SHA1 a16f84c4039ddccf9960cee21cb8860f2f1cf34c
SHA256 3f6c84150d51188f54330ce514518c879705052abad3f89325e9c279f1d9403e
SHA512 c599ec24478794dbe3fd1f3124bb93423b610a5d36eb76d625a2401fcc5f368ee40bca9585ba156a06747c593bc415369ae2106ee48b94044a72a59bd1949b79

memory/3692-139-0x00000000004B2000-0x00000000004C8000-memory.dmp

memory/3692-140-0x0000000000400000-0x0000000000458000-memory.dmp

memory/3704-141-0x0000000000659000-0x000000000066F000-memory.dmp

memory/3704-142-0x0000000000400000-0x0000000000458000-memory.dmp