Malware Analysis Report

2025-08-05 21:11

Sample ID 240110-gyx5ksbcd4
Target 4fccfed3868ef42c54f33dd7c002bb2c
SHA256 02c198348bbf5ce3b7ee384c5c482a991689e219e21456048b3bc5c64a6a58b6
Tags
vmprotect
score
8/10

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
8/10

SHA256

02c198348bbf5ce3b7ee384c5c482a991689e219e21456048b3bc5c64a6a58b6

Threat Level: Likely malicious

The file 4fccfed3868ef42c54f33dd7c002bb2c was found to be: Likely malicious.

Malicious Activity Summary

vmprotect

Drops file in Drivers directory

Deletes itself

Loads dropped DLL

VMProtect packed file

Drops file in System32 directory

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: LoadsDriver

Suspicious use of WriteProcessMemory

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-01-10 06:13

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-01-10 06:13

Reported

2024-01-10 07:01

Platform

win7-20231215-en

Max time kernel

119s

Max time network

124s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe"

Signatures

Drops file in Drivers directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\drivers\beep.sys C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Deletes itself

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

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

VMProtect packed file

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

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\RumxtwC.dll C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Suspicious behavior: LoadsDriver

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe

"C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe"

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\4FCCFE~1.EXE > nul

Network

N/A

Files

\Windows\SysWOW64\RumxtwC.dll

MD5 b916665ad5f7f82d48870e348cc8b30a
SHA1 0d598819f7e51ba6ad54d6ce3e026aab3a95f5a5
SHA256 906fc301c36ab78ad7682990ab1e05335c64405d2c143ef4eec557a2a85ce045
SHA512 89b817bec1e0a3aee1618698d484c29f0973b35f8bac334c67090098c18985b3d2f7a071c1c6cabcf169036df9b5ca6ecd8277c58d574685fb3431cc27572326

Analysis: behavioral2

Detonation Overview

Submitted

2024-01-10 06:13

Reported

2024-01-10 07:01

Platform

win10v2004-20231215-en

Max time kernel

144s

Max time network

153s

Command Line

"C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe"

Signatures

Drops file in Drivers directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\drivers\beep.sys C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Loads dropped DLL

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

VMProtect packed file

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

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\SysWOW64\RzmgtvC.dll C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Suspicious behavior: LoadsDriver

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

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeIncBasePriorityPrivilege N/A C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe

"C:\Users\Admin\AppData\Local\Temp\4fccfed3868ef42c54f33dd7c002bb2c.exe"

C:\Windows\SysWOW64\cmd.exe

C:\Windows\system32\cmd.exe /c del C:\Users\Admin\AppData\Local\Temp\4FCCFE~1.EXE > nul

Network

Country Destination Domain Proto
NL 52.142.223.178:80 tcp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 84.177.190.20.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 59.128.231.4.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 103.169.127.40.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 198.187.3.20.in-addr.arpa udp
US 8.8.8.8:53 18.134.221.88.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
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 16.173.189.20.in-addr.arpa udp

Files

C:\Windows\SysWOW64\RzmgtvC.dll

MD5 d41d8cd98f00b204e9800998ecf8427e
SHA1 da39a3ee5e6b4b0d3255bfef95601890afd80709
SHA256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA512 cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

C:\Windows\SysWOW64\RzmgtvC.dll

MD5 b916665ad5f7f82d48870e348cc8b30a
SHA1 0d598819f7e51ba6ad54d6ce3e026aab3a95f5a5
SHA256 906fc301c36ab78ad7682990ab1e05335c64405d2c143ef4eec557a2a85ce045
SHA512 89b817bec1e0a3aee1618698d484c29f0973b35f8bac334c67090098c18985b3d2f7a071c1c6cabcf169036df9b5ca6ecd8277c58d574685fb3431cc27572326