Malware Analysis Report

2025-04-13 10:47

Sample ID 231225-yvrbashac4
Target 3a2b189ba8182eb62ea6bfc27e8ca898
SHA256 f988c17ff348d65c83b031d164e3a3850b38f4e6b2c43cd426dfafd68474301a
Tags
xloader wufn loader rat
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

f988c17ff348d65c83b031d164e3a3850b38f4e6b2c43cd426dfafd68474301a

Threat Level: Known bad

The file 3a2b189ba8182eb62ea6bfc27e8ca898 was found to be: Known bad.

Malicious Activity Summary

xloader wufn loader rat

Xloader

CustAttr .NET packer

Xloader payload

Suspicious use of SetThreadContext

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2023-12-25 20:06

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-25 20:06

Reported

2023-12-29 10:40

Platform

win7-20231215-en

Max time kernel

118s

Max time network

123s

Command Line

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

Signatures

Xloader

loader xloader

CustAttr .NET packer

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

Xloader payload

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1732 set thread context of 2724 N/A C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

Network

N/A

Files

memory/1732-0-0x0000000000D30000-0x0000000000E84000-memory.dmp

memory/1732-1-0x00000000747F0000-0x0000000074EDE000-memory.dmp

memory/1732-2-0x0000000005020000-0x0000000005060000-memory.dmp

memory/1732-3-0x0000000000480000-0x0000000000492000-memory.dmp

memory/1732-4-0x00000000747F0000-0x0000000074EDE000-memory.dmp

memory/1732-5-0x0000000005020000-0x0000000005060000-memory.dmp

memory/1732-6-0x00000000058B0000-0x000000000594E000-memory.dmp

memory/1732-7-0x0000000000530000-0x000000000055E000-memory.dmp

memory/2724-8-0x0000000000400000-0x0000000000428000-memory.dmp

memory/2724-10-0x0000000000400000-0x0000000000428000-memory.dmp

memory/2724-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2724-14-0x0000000000400000-0x0000000000428000-memory.dmp

memory/1732-15-0x00000000747F0000-0x0000000074EDE000-memory.dmp

memory/2724-16-0x0000000000820000-0x0000000000B23000-memory.dmp

memory/2724-17-0x0000000000820000-0x0000000000B23000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-25 20:06

Reported

2023-12-29 10:40

Platform

win10v2004-20231215-en

Max time kernel

139s

Max time network

163s

Command Line

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

Signatures

Xloader

loader xloader

CustAttr .NET packer

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

Xloader payload

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

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2336 set thread context of 2376 N/A C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe N/A

Processes

C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe

"C:\Users\Admin\AppData\Local\Temp\3a2b189ba8182eb62ea6bfc27e8ca898.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 71.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 180.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 241.154.82.20.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 56.126.166.20.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
US 8.8.8.8:53 www.microsoft.com udp
US 92.123.241.137:80 www.microsoft.com tcp
US 8.8.8.8:53 208.194.73.20.in-addr.arpa udp
US 8.8.8.8:53 41.110.16.96.in-addr.arpa udp
US 8.8.8.8:53 137.241.123.92.in-addr.arpa udp
US 92.123.241.137:80 www.microsoft.com tcp
US 8.8.8.8:53 217.135.221.88.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 13.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 173.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 18.173.189.20.in-addr.arpa udp

Files

memory/2336-0-0x0000000000E40000-0x0000000000F94000-memory.dmp

memory/2336-1-0x0000000074960000-0x0000000075110000-memory.dmp

memory/2336-2-0x0000000005A10000-0x0000000005AAC000-memory.dmp

memory/2336-3-0x0000000006060000-0x0000000006604000-memory.dmp

memory/2336-4-0x0000000005AB0000-0x0000000005B42000-memory.dmp

memory/2336-5-0x0000000005A00000-0x0000000005A10000-memory.dmp

memory/2336-7-0x0000000005C40000-0x0000000005C96000-memory.dmp

memory/2336-6-0x0000000005990000-0x000000000599A000-memory.dmp

memory/2336-8-0x0000000005E60000-0x0000000005E72000-memory.dmp

memory/2336-9-0x0000000074960000-0x0000000075110000-memory.dmp

memory/2336-10-0x0000000005A00000-0x0000000005A10000-memory.dmp

memory/2336-11-0x0000000001940000-0x00000000019DE000-memory.dmp

memory/2336-12-0x00000000015E0000-0x000000000160E000-memory.dmp

memory/2376-13-0x0000000000400000-0x0000000000428000-memory.dmp

memory/2336-15-0x0000000074960000-0x0000000075110000-memory.dmp

memory/2376-16-0x00000000016C0000-0x0000000001A0A000-memory.dmp