Malware Analysis Report

2024-12-07 22:24

Sample ID 240408-agf2eaag4z
Target e62f3a9fcde2987b30418db6aee857db_JaffaCakes118
SHA256 0d9fb244ea506b9994b55ca4fcf970cda40af79c08ea8f7bd1e34ce2c283cfd0
Tags
remcos remotehost 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

0d9fb244ea506b9994b55ca4fcf970cda40af79c08ea8f7bd1e34ce2c283cfd0

Threat Level: Known bad

The file e62f3a9fcde2987b30418db6aee857db_JaffaCakes118 was found to be: Known bad.

Malicious Activity Summary

remcos remotehost persistence rat

Remcos

Executes dropped EXE

Deletes itself

Loads dropped DLL

Adds Run key to start application

Suspicious use of SetThreadContext

Unsigned PE

Enumerates physical storage devices

Program crash

Suspicious behavior: MapViewOfSection

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Suspicious use of FindShellTrayWindow

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-08 00:10

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-08 00:10

Reported

2024-04-08 00:13

Platform

win7-20240221-en

Max time kernel

148s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe"

Signatures

Remcos

rat remcos

Deletes itself

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

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:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\Software\Microsoft\Windows\CurrentVersion\Run\Remcos = "\"C:\\Users\\Admin\\AppData\\Roaming\\Remcos\\remcos.exe\"" C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-330940541-141609230-1670313778-1000\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\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe N/A
N/A N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe N/A

Suspicious use of FindShellTrayWindow

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

Suspicious use of SendNotifyMessage

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 2244 wrote to memory of 2364 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe
PID 2244 wrote to memory of 2364 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe
PID 2244 wrote to memory of 2364 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe
PID 2244 wrote to memory of 2364 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe
PID 2244 wrote to memory of 2364 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe
PID 2364 wrote to memory of 2936 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Windows\SysWOW64\WScript.exe
PID 2364 wrote to memory of 2936 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Windows\SysWOW64\WScript.exe
PID 2364 wrote to memory of 2936 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Windows\SysWOW64\WScript.exe
PID 2364 wrote to memory of 2936 N/A C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe C:\Windows\SysWOW64\WScript.exe
PID 2936 wrote to memory of 2680 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2936 wrote to memory of 2680 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2936 wrote to memory of 2680 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2936 wrote to memory of 2680 N/A C:\Windows\SysWOW64\WScript.exe C:\Windows\SysWOW64\cmd.exe
PID 2680 wrote to memory of 2548 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2680 wrote to memory of 2548 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2680 wrote to memory of 2548 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2680 wrote to memory of 2548 N/A C:\Windows\SysWOW64\cmd.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2548 wrote to memory of 2556 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2548 wrote to memory of 2556 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2548 wrote to memory of 2556 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2548 wrote to memory of 2556 N/A C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
PID 2548 wrote to memory of 2556 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\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.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
US 8.8.8.8:53 namsgee.duckdns.org udp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 8.8.8.8:53 namsgee.duckdns.org udp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 23.29.115.152:7642 namsgee.duckdns.org tcp
US 8.8.8.8:53 namsgee.duckdns.org udp
US 23.29.115.152:7642 namsgee.duckdns.org tcp

Files

memory/2244-0-0x0000000000400000-0x0000000000440000-memory.dmp

memory/2244-1-0x00000000001C0000-0x00000000001C2000-memory.dmp

memory/2364-2-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2244-3-0x0000000000400000-0x0000000000440000-memory.dmp

memory/2364-5-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2364-8-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2364-11-0x0000000000400000-0x0000000000479000-memory.dmp

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

MD5 b4796b900df5f5855f2b96402a3d2bc3
SHA1 d716fddefa4d60e58c510e8549d738c383644a55
SHA256 c686122edf277747c204a59804bb847849f6351f150daa7d71db089b1a7472e2
SHA512 1c3e858bd278e99e0d6fed5a4312daf72d023ac887332243f5bc1ba6d92b4fbc69a9b48f661e56bcb38dca3ee2d39d9aefe1e25d132b404d1a94639270d66d0e

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

MD5 e62f3a9fcde2987b30418db6aee857db
SHA1 2e7278a0538398e3d1c7d4291595732b4c9579c2
SHA256 0d9fb244ea506b9994b55ca4fcf970cda40af79c08ea8f7bd1e34ce2c283cfd0
SHA512 838809fac6bb7826190754f65f90abe6c9191cb5628d25650f4c6ead9a7598ca2fa565fbacc33d1ce11e8a2149699f35489a0ef3b58da7f0a92da843ddd78918

memory/2548-17-0x0000000000400000-0x0000000000440000-memory.dmp

memory/2548-22-0x0000000000400000-0x0000000000440000-memory.dmp

memory/2556-23-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-24-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-26-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-25-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-27-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-29-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-31-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-33-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-35-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-38-0x0000000000400000-0x0000000000479000-memory.dmp

memory/2556-40-0x0000000000400000-0x0000000000479000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-04-08 00:10

Reported

2024-04-08 00:13

Platform

win10v2004-20240226-en

Max time kernel

149s

Max time network

150s

Command Line

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe"

C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe

"C:\Users\Admin\AppData\Local\Temp\e62f3a9fcde2987b30418db6aee857db_JaffaCakes118.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 640 -ip 640

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 640 -s 292

Network

Country Destination Domain Proto
US 8.8.8.8:53 228.249.119.40.in-addr.arpa udp
US 8.8.8.8:53 4.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 86.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 15.164.165.52.in-addr.arpa udp
US 8.8.8.8:53 121.118.77.104.in-addr.arpa udp
US 8.8.8.8:53 240.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 249.197.17.2.in-addr.arpa udp
US 8.8.8.8:53 30.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 udp

Files

memory/640-1-0x0000000000600000-0x0000000000602000-memory.dmp

memory/640-0-0x0000000000400000-0x0000000000440000-memory.dmp