Malware Analysis Report

2025-01-02 03:12

Sample ID 240814-xbfj1sxepc
Target a44d77d22771b1964622f6b3a0e94f6c7abf35e578ee931583a288e686b6da3d
SHA256 a44d77d22771b1964622f6b3a0e94f6c7abf35e578ee931583a288e686b6da3d
Tags
remcos remotehost discovery rat
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

a44d77d22771b1964622f6b3a0e94f6c7abf35e578ee931583a288e686b6da3d

Threat Level: Known bad

The file a44d77d22771b1964622f6b3a0e94f6c7abf35e578ee931583a288e686b6da3d was found to be: Known bad.

Malicious Activity Summary

remcos remotehost discovery rat

Remcos

Suspicious use of SetThreadContext

Program crash

Unsigned PE

System Location Discovery: System Language Discovery

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-14 18:40

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-14 18:40

Reported

2024-08-14 18:43

Platform

win7-20240704-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe"

Signatures

Remcos

rat remcos

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 2676 set thread context of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Program Files (x86)\Windows Media Player\wmplayer.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2676 wrote to memory of 2196 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
PID 2676 wrote to memory of 2196 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
PID 2676 wrote to memory of 2196 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
PID 2676 wrote to memory of 2196 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
PID 2676 wrote to memory of 1712 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 2676 wrote to memory of 1712 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 2676 wrote to memory of 1712 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 2676 wrote to memory of 1712 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 1916 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Program Files (x86)\Windows Media Player\wmplayer.exe
PID 2676 wrote to memory of 2704 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\system32\WerFault.exe
PID 2676 wrote to memory of 2704 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\system32\WerFault.exe
PID 2676 wrote to memory of 2704 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\system32\WerFault.exe

Processes

C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe

"C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe"

C:\Program Files (x86)\Windows Media Player\wmplayer.exe

"C:\Program Files (x86)\Windows Media Player\wmplayer.exe"

C:\Windows\system32\WerFault.exe

C:\Windows\system32\WerFault.exe -u -p 2676 -s 648

Network

Country Destination Domain Proto
US 8.8.8.8:53 eadzagba1.duckdns.org udp
US 198.46.178.133:4877 eadzagba1.duckdns.org tcp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp

Files

memory/2676-0-0x000007FEF5463000-0x000007FEF5464000-memory.dmp

memory/2676-1-0x0000000000C00000-0x0000000000C0A000-memory.dmp

memory/2676-2-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

memory/2676-3-0x0000000000A70000-0x0000000000B42000-memory.dmp

memory/1916-4-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-10-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-12-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-8-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-6-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-21-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-22-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/1916-15-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-14-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-20-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-16-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-18-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-23-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-24-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-25-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-26-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-28-0x0000000000400000-0x0000000000482000-memory.dmp

memory/2676-29-0x000007FEF5463000-0x000007FEF5464000-memory.dmp

memory/2676-30-0x000007FEF5460000-0x000007FEF5E4C000-memory.dmp

memory/1916-31-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-32-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-33-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-34-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-36-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-37-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-38-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-40-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1916-41-0x0000000000400000-0x0000000000482000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-08-14 18:40

Reported

2024-08-14 18:43

Platform

win10v2004-20240802-en

Max time kernel

144s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe"

Signatures

Remcos

rat remcos

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1684 set thread context of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
PID 1684 wrote to memory of 5108 N/A C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe

Processes

C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe

"C:\Users\Admin\AppData\Local\Temp\samples & specifications.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 5108 -ip 5108

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 5108 -s 16

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 g.bing.com udp
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 67.31.126.40.in-addr.arpa udp
US 204.79.197.237:443 g.bing.com tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 13.107.21.237:443 g.bing.com tcp
US 8.8.8.8:53 237.21.107.13.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 8.8.8.8:53 172.214.232.199.in-addr.arpa udp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 232.168.11.51.in-addr.arpa udp
US 8.8.8.8:53 19.229.111.52.in-addr.arpa udp
US 8.8.8.8:53 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 88.156.103.20.in-addr.arpa udp

Files

memory/1684-0-0x000001C6DEC30000-0x000001C6DEC3A000-memory.dmp

memory/1684-1-0x00007FFD835D0000-0x00007FFD83899000-memory.dmp

memory/1684-2-0x00007FFD835D0000-0x00007FFD83899000-memory.dmp

memory/1684-3-0x000001C6F9240000-0x000001C6F9312000-memory.dmp

memory/5108-4-0x0000000000400000-0x0000000000482000-memory.dmp

memory/1684-5-0x00007FFD835D0000-0x00007FFD83899000-memory.dmp