Malware Analysis Report

2025-08-10 12:15

Sample ID 240607-nvzybsgf22
Target f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573
SHA256 f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573
Tags
upx persistence
score
8/10

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
8/10

SHA256

f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573

Threat Level: Likely malicious

The file f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573 was found to be: Likely malicious.

Malicious Activity Summary

upx persistence

Modifies AppInit DLL entries

ACProtect 1.3x - 1.4x DLL software

Loads dropped DLL

UPX packed file

Drops file in Program Files directory

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-06-07 11:44

Signatures

N/A

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-07 11:43

Reported

2024-06-07 11:55

Platform

win7-20240508-en

Max time kernel

122s

Max time network

126s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

Signatures

ACProtect 1.3x - 1.4x DLL software

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

Loads dropped DLL

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

UPX packed file

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

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 1712 wrote to memory of 1916 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\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

Network

N/A

Files

\Program Files\Common Files\System\symsrv.dll

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/1916-3-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1916-5-0x0000000010000000-0x0000000010030000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-07 11:43

Reported

2024-06-07 11:55

Platform

win10v2004-20240508-en

Max time kernel

149s

Max time network

102s

Command Line

rundll32.exe C:\Users\Admin\AppData\Local\Temp\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

Signatures

Modifies AppInit DLL entries

persistence

ACProtect 1.3x - 1.4x DLL software

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

Loads dropped DLL

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

UPX packed file

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

Drops file in Program Files directory

Description Indicator Process Target
File created C:\Program Files\Common Files\System\symsrv.dll C:\Windows\SysWOW64\rundll32.exe N/A

Suspicious use of AdjustPrivilegeToken

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4028 wrote to memory of 1876 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4028 wrote to memory of 1876 N/A C:\Windows\system32\rundll32.exe C:\Windows\SysWOW64\rundll32.exe
PID 4028 wrote to memory of 1876 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\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

C:\Windows\SysWOW64\rundll32.exe

rundll32.exe C:\Users\Admin\AppData\Local\Temp\f5e6027cde15f2d0de051f4c1260e3b3a06ea8ebf9c4d1676c2ca037c0e00573.dll,#1

Network

Country Destination Domain Proto
US 8.8.8.8:53 196.249.167.52.in-addr.arpa udp
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 240.143.123.92.in-addr.arpa udp
US 8.8.8.8:53 134.32.126.40.in-addr.arpa udp
BE 88.221.83.187:443 www.bing.com tcp
US 8.8.8.8:53 187.83.221.88.in-addr.arpa udp
US 8.8.8.8:53 217.106.137.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.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 58.99.105.20.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 udp
N/A 52.168.117.170:443 tcp
SE 192.229.221.95:80 tcp
US 8.8.8.8:53 udp

Files

C:\Program Files\Common Files\System\symsrv.dll

MD5 7574cf2c64f35161ab1292e2f532aabf
SHA1 14ba3fa927a06224dfe587014299e834def4644f
SHA256 de055a89de246e629a8694bde18af2b1605e4b9b493c7e4aef669dd67acf5085
SHA512 4db19f2d8d5bc1c7bbb812d3fa9c43b80fa22140b346d2760f090b73aed8a5177edb4bddc647a6ebd5a2db8565be5a1a36a602b0d759e38540d9a584ba5896ab

memory/1876-6-0x00000000757D0000-0x000000007581C000-memory.dmp

memory/1876-5-0x00000000757D1000-0x00000000757D2000-memory.dmp

memory/1876-4-0x0000000010000000-0x0000000010030000-memory.dmp

memory/1876-9-0x0000000010000000-0x0000000010030000-memory.dmp