Malware Analysis Report

2025-01-22 12:53

Sample ID 240521-gawa3sdb86
Target WeChatApi.dll
SHA256 324198f66360d0cd7a02d80a10f93cc3e68af49c3f791dcdd2f6a3851ca52f89
Tags
vmprotect
score
7/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
7/10

SHA256

324198f66360d0cd7a02d80a10f93cc3e68af49c3f791dcdd2f6a3851ca52f89

Threat Level: Shows suspicious behavior

The file WeChatApi.dll was found to be: Shows suspicious behavior.

Malicious Activity Summary

vmprotect

VMProtect packed file

Program crash

Unsigned PE

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-05-21 05:36

Signatures

VMProtect packed file

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

Unsigned PE

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

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-21 05:36

Reported

2024-05-21 06:07

Platform

win10v2004-20240508-en

Max time kernel

140s

Max time network

126s

Command Line

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

Signatures

VMProtect packed file

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

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3512 wrote to memory of 2328 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3512 wrote to memory of 2328 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 3512 wrote to memory of 2328 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\WeChatApi.dll,#1

C:\Windows\SysWOW64\rundll32.exe

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

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2328 -ip 2328

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2328 -s 624

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 73.31.126.40.in-addr.arpa udp
US 8.8.8.8:53 241.150.49.20.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 77.190.18.2.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp

Files

memory/2328-1-0x0000000074700000-0x00000000751F4000-memory.dmp

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-21 05:36

Reported

2024-05-21 06:07

Platform

win7-20240508-en

Max time kernel

119s

Max time network

124s

Command Line

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

Signatures

VMProtect packed file

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

Program crash

Description Indicator Process Target
N/A N/A C:\Windows\SysWOW64\WerFault.exe C:\Windows\SysWOW64\rundll32.exe

Processes

C:\Windows\system32\rundll32.exe

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

C:\Windows\SysWOW64\rundll32.exe

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

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2980 -s 220

Network

N/A

Files

memory/2980-0-0x0000000073370000-0x0000000073E64000-memory.dmp