Malware Analysis Report

2025-01-18 18:17

Sample ID 241125-pgvl5aspaj
Target 9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118
SHA256 290a9efc4fdd998fd8e30fe0c001f44c2aa698efea9f643ea63bca6eff8a5e4f
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

290a9efc4fdd998fd8e30fe0c001f44c2aa698efea9f643ea63bca6eff8a5e4f

Threat Level: Known bad

The file 9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118 was found to be: Known bad.

Malicious Activity Summary

yunsip banker discovery trojan

Yunsip

Yunsip family

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-11-25 12:18

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-11-25 12:18

Reported

2024-11-25 12:21

Platform

win7-20240903-en

Max time kernel

120s

Max time network

121s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.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 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 2640 wrote to memory of 1948 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\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.dll,#1

Network

N/A

Files

N/A

Analysis: behavioral2

Detonation Overview

Submitted

2024-11-25 12:18

Reported

2024-11-25 12:21

Platform

win10v2004-20241007-en

Max time kernel

150s

Max time network

150s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.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 3904 wrote to memory of 1700 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3904 wrote to memory of 1700 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3904 wrote to memory of 1700 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\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\9b6d2a2a3033be2c1e87fd39d35450c0_JaffaCakes118.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 217.72.21.2.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.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 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 83.210.23.2.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

N/A