Malware Analysis Report

2024-10-19 10:29

Sample ID 221020-z623lsfbf9
Target 54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088
SHA256 54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088
Tags
yunsip banker 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

54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088

Threat Level: Known bad

The file 54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088 was found to be: Known bad.

Malicious Activity Summary

yunsip banker trojan

Yunsip

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2022-10-20 21:20

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2022-10-20 21:20

Reported

2022-10-21 00:45

Platform

win7-20220812-en

Max time kernel

42s

Max time network

46s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

Signatures

Yunsip

trojan banker yunsip

Processes

C:\Windows\system32\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

Network

N/A

Files

memory/964-54-0x0000000000000000-mapping.dmp

memory/964-55-0x0000000074BB1000-0x0000000074BB3000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2022-10-20 21:20

Reported

2022-10-21 00:44

Platform

win10v2004-20220901-en

Max time kernel

61s

Max time network

125s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

Signatures

Yunsip

trojan banker yunsip

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4100 wrote to memory of 4288 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4100 wrote to memory of 4288 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4100 wrote to memory of 4288 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\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\54b25b1e53342c71fd40cf05d0cd2ace3d5ea7a1a060ca607943c3b6bc280088.dll,#1

Network

Country Destination Domain Proto
US 20.189.173.15:443 tcp
FR 2.18.109.224:443 tcp

Files

memory/4288-132-0x0000000000000000-mapping.dmp