Malware Analysis Report

2025-08-06 02:54

Sample ID 240215-bbbeeada21
Target 9c89d5c943e0569efd3d2bc58b62a4ea
SHA256 2274248efc8c44261f3f742f58cf46853ef66ee351b6612c6ffbfffcd06c1508
Tags
remcos remotehost1 persistence 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

2274248efc8c44261f3f742f58cf46853ef66ee351b6612c6ffbfffcd06c1508

Threat Level: Known bad

The file 9c89d5c943e0569efd3d2bc58b62a4ea was found to be: Known bad.

Malicious Activity Summary

remcos remotehost1 persistence rat

Remcos

Executes dropped EXE

Loads dropped DLL

Adds Run key to start application

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Program crash

Suspicious use of SetWindowsHookEx

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-02-15 00:57

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-02-15 00:57

Reported

2024-02-15 01:00

Platform

win7-20231215-en

Max time kernel

148s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

Signatures

Remcos

rat remcos

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Loads dropped DLL

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

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\"" C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-1268429524-3929314613-1992311491-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\"" C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Enumerates physical storage devices

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2256 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
PID 2256 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
PID 2256 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
PID 2256 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
PID 2256 wrote to memory of 2916 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe
PID 2916 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Windows\SysWOW64\WScript.exe
PID 2916 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Windows\SysWOW64\WScript.exe
PID 2916 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Windows\SysWOW64\WScript.exe
PID 2916 wrote to memory of 2700 N/A C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe C:\Windows\SysWOW64\WScript.exe
PID 2700 wrote to memory of 2820 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2820 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2820 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2700 wrote to memory of 2820 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2820 wrote to memory of 3024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2820 wrote to memory of 3024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2820 wrote to memory of 3024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2820 wrote to memory of 3024 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 3024 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 3024 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 3024 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 3024 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 3024 wrote to memory of 2620 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

Processes

C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

C:\Windows\SysWOW64\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"

C:\Windows\SysWOW64\cmd.exe

"C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe

Network

Country Destination Domain Proto
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp
SE 185.157.160.215:2405 tcp

Files

memory/2256-1-0x0000000000090000-0x0000000000190000-memory.dmp

memory/2256-2-0x0000000000220000-0x0000000000222000-memory.dmp

memory/2916-3-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2916-5-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2916-7-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2916-11-0x0000000000400000-0x0000000000479000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\install.vbs

MD5 b92d64fe5b1d1f59df4b738262aea8df
SHA1 c8fb1981759c2d9bb2ec91b705985fba5fc7af63
SHA256 fa20e9aab03dc8e9f1910aaf0cf42662379fa16ae3a22642084fb97fa3d4f83a
SHA512 2566248b93c0cfb0414f033b8dd18bbd4f88180093eac2861107289bcb4ee160f9593706ff1f7d1f2e4ecea430d67a5a2897551a4f9ebd82b707243e300520e2

\Users\Admin\AppData\Roaming\Remcos\remcos.exe

MD5 9c89d5c943e0569efd3d2bc58b62a4ea
SHA1 5560da6d905f87a54585d896e2d60cdd76e55f63
SHA256 2274248efc8c44261f3f742f58cf46853ef66ee351b6612c6ffbfffcd06c1508
SHA512 296aa08705d751fa49886bb0e669dd1b922531a30965fdf6283d4ea1908bdcc39587244527138222c9e5573fa657923a9e21f27d2a2f377d49402ef89544ce40

memory/2620-22-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-25-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-23-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-26-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-29-0x0000000000400000-0x0000000000479000-memory.dmp

C:\Users\Admin\AppData\Roaming\Remcos\logs.dat

MD5 c42b5f7aa65b005fa825285014fc8e12
SHA1 6adaa03f43ea36028f1c228450d68d077262b845
SHA256 49874b40248fce7e013ada47f0651eff1e39425a650b15e9cfef8d3a51ac8637
SHA512 b27fe2b46fbb8ee0525e149d2e3ed113a1ff8e455ff52c8a839a8adc50916d66d23a7eace293a4b947d45fc726f663084b978f0dd112f433adac70fab6a97190

memory/2620-35-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-41-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-47-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-53-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-62-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2620-68-0x0000000000400000-0x0000000000479000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-02-15 00:57

Reported

2024-02-15 01:00

Platform

win10v2004-20231215-en

Max time kernel

127s

Max time network

148s

Command Line

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe

"C:\Users\Admin\AppData\Local\Temp\9c89d5c943e0569efd3d2bc58b62a4ea.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1180 -ip 1180

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 1180 -s 332

Network

Country Destination Domain Proto
US 8.8.8.8:53 97.17.167.52.in-addr.arpa udp
US 8.8.8.8:53 0.205.248.87.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 138.91.171.81:80 tcp
US 8.8.8.8:53 154.239.44.20.in-addr.arpa udp
US 8.8.8.8:53 178.223.142.52.in-addr.arpa udp
US 8.8.8.8:53 50.23.12.20.in-addr.arpa udp
US 8.8.8.8:53 171.39.242.20.in-addr.arpa udp
US 8.8.8.8:53 217.135.221.88.in-addr.arpa udp
US 8.8.8.8:53 209.178.17.96.in-addr.arpa udp
US 8.8.8.8:53 81.171.91.138.in-addr.arpa udp

Files

memory/1180-1-0x00000000000A0000-0x00000000001A0000-memory.dmp

memory/1180-2-0x0000000000B10000-0x0000000000B12000-memory.dmp