Malware Analysis Report

2024-10-19 10:29

Sample ID 241014-a6y9aaycnn
Target 8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416
SHA256 8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416
Tags
yunsip banker discovery trojan
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

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

8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416

Threat Level: Known bad

The file 8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416 was found to be: Known bad.

Malicious Activity Summary

yunsip banker discovery trojan

Yunsip

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-10-14 00:50

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-10-14 00:50

Reported

2024-10-14 00:52

Platform

win7-20240903-en

Max time kernel

120s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

Signatures

Yunsip

trojan banker yunsip

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2508 wrote to memory of 2364 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\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-10-14 00:50

Reported

2024-10-14 00:52

Platform

win10v2004-20241007-en

Max time kernel

100s

Max time network

134s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

Signatures

Yunsip

trojan banker yunsip

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4812 wrote to memory of 2472 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4812 wrote to memory of 2472 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4812 wrote to memory of 2472 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\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\8cd7c3484dc6efd65911c1847706803a2079e186a093f8a909443580bc7c7416.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 53.210.109.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 27.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp

Files

N/A