Malware Analysis Report

2025-06-16 01:20

Sample ID 240410-jkbersbe5y
Target 85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f
SHA256 85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f
Tags
remcos limao 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

85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f

Threat Level: Known bad

The file 85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f was found to be: Known bad.

Malicious Activity Summary

remcos limao rat

Remcos

Suspicious use of SetThreadContext

Drops file in Windows directory

Program crash

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

N/A

Analysis: static1

Detonation Overview

Reported

2024-04-10 07:43

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-10 07:43

Reported

2024-04-10 07:45

Platform

win7-20240221-en

Max time kernel

150s

Max time network

152s

Command Line

"C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe"

Signatures

Remcos

rat remcos

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Microsoft.NET\Framework\v4.0.30319\logs\logs.dat C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe N/A
File created C:\Windows\Microsoft.NET\Framework\v4.0.30319\logs\logs.dat C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 2928 wrote to memory of 2644 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe

Processes

C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe

"C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"

Network

Country Destination Domain Proto
US 8.8.8.8:53 www.google.com udp
GB 142.250.178.4:443 www.google.com tcp
US 8.8.8.8:53 defenderav.con-ip.com udp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp
CO 181.235.10.144:33892 defenderav.con-ip.com tcp

Files

memory/2928-1-0x00000000746D0000-0x0000000074DBE000-memory.dmp

memory/2928-0-0x0000000000C00000-0x0000000000D2A000-memory.dmp

memory/2928-2-0x0000000000B40000-0x0000000000B80000-memory.dmp

memory/2928-3-0x0000000000AF0000-0x0000000000B24000-memory.dmp

memory/2928-4-0x0000000000B20000-0x0000000000B3A000-memory.dmp

memory/2928-5-0x00000000003D0000-0x00000000003D6000-memory.dmp

memory/2644-6-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-8-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-10-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-11-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-12-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-13-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-14-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-15-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-16-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

memory/2644-18-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2928-21-0x00000000746D0000-0x0000000074DBE000-memory.dmp

memory/2644-20-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-22-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-23-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-25-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-26-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-27-0x0000000000400000-0x000000000047A000-memory.dmp

C:\Windows\Microsoft.NET\Framework\v4.0.30319\logs\logs.dat

MD5 00969feba289d0b1df02e3cb4706b4a3
SHA1 978077e1858262a855f6579b2f8b06b1492b5b2b
SHA256 63b290c53c1157a572fb5e875084055c99984a4073ee68554f80509fd9d7fa2a
SHA512 251db0937d6a2edd2405dd980a7802016a6ef6a382230671af99a074403a7a7ce90ed1e675443e247bd0db790b28743289d7e8b829f81ad7ecf3ae6828fd3fc8

memory/2644-33-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-34-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-35-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-40-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-41-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-47-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-48-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-53-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-54-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-59-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-61-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-66-0x0000000000400000-0x000000000047A000-memory.dmp

memory/2644-67-0x0000000000400000-0x000000000047A000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-10 07:43

Reported

2024-04-10 07:45

Platform

win10v2004-20240226-en

Max time kernel

149s

Max time network

151s

Command Line

"C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe"

Signatures

Remcos

rat remcos

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
PID 4460 wrote to memory of 3664 N/A C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe

Processes

C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe

"C:\Users\Admin\AppData\Local\Temp\85436adfcf697218c41b0aa04b3dc6b0ef20e6b4d5dc4d630f82b1c75d48644f.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 3664 -ip 3664

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 3664 -s 496

Network

Country Destination Domain Proto
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 www.google.com udp
GB 142.250.178.4:443 www.google.com tcp
US 8.8.8.8:53 4.178.250.142.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 20.231.121.79:80 tcp
US 8.8.8.8:53 149.220.183.52.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 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.in-addr.arpa udp
US 8.8.8.8:53 240.221.184.93.in-addr.arpa udp
US 8.8.8.8:53 27.178.89.13.in-addr.arpa udp

Files

memory/4460-1-0x0000000075120000-0x00000000758D0000-memory.dmp

memory/4460-0-0x0000000000AA0000-0x0000000000BCA000-memory.dmp

memory/4460-2-0x00000000057A0000-0x0000000005D44000-memory.dmp

memory/4460-3-0x00000000050E0000-0x0000000005172000-memory.dmp

memory/4460-4-0x0000000005290000-0x000000000532C000-memory.dmp

memory/4460-5-0x00000000050C0000-0x00000000050D0000-memory.dmp

memory/4460-6-0x0000000006640000-0x0000000006674000-memory.dmp

memory/4460-7-0x00000000090E0000-0x00000000090EA000-memory.dmp

memory/4460-8-0x00000000050C0000-0x00000000050D0000-memory.dmp

memory/4460-9-0x000000000A0D0000-0x000000000A0EA000-memory.dmp

memory/4460-10-0x0000000007B60000-0x0000000007B66000-memory.dmp

memory/3664-12-0x0000000000350000-0x00000000003CA000-memory.dmp

memory/4460-16-0x0000000075120000-0x00000000758D0000-memory.dmp

memory/3664-19-0x0000000000350000-0x00000000003CA000-memory.dmp

memory/3664-24-0x0000000000350000-0x00000000003CA000-memory.dmp