Malware Analysis Report

2025-01-18 18:15

Sample ID 241216-1dy1xs1jd1
Target 91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.exe
SHA256 91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8
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

91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8

Threat Level: Known bad

The file 91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.exe was found to be: Known bad.

Malicious Activity Summary

yunsip banker discovery trojan

Yunsip

Yunsip family

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-12-16 21:32

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-12-16 21:32

Reported

2024-12-16 21:34

Platform

win7-20241023-en

Max time kernel

119s

Max time network

17s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

Signatures

Yunsip

trojan banker yunsip

Yunsip family

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 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2344 wrote to memory of 1304 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\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-12-16 21:32

Reported

2024-12-16 21:34

Platform

win10v2004-20241007-en

Max time kernel

91s

Max time network

92s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

Signatures

Yunsip

trojan banker yunsip

Yunsip family

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 3780 wrote to memory of 4684 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3780 wrote to memory of 4684 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3780 wrote to memory of 4684 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\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\91ebd384f334010cc1dccd9db4a97c859f75045a6c37f7bd69e932ed6a4568b8.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 73.144.22.2.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 56.163.245.4.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 92.12.20.2.in-addr.arpa udp
US 8.8.8.8:53 182.129.81.91.in-addr.arpa udp

Files

N/A