Malware Analysis Report

2024-12-07 22:31

Sample ID 240405-v5s14aae96
Target RemBuild.exe
SHA256 b6fa0443564d16a046341addae783cdd610aa5eace7135153c141eda7dc7fa64
Tags
remotehost remcos
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 Overview

score
10/10

SHA256

b6fa0443564d16a046341addae783cdd610aa5eace7135153c141eda7dc7fa64

Threat Level: Known bad

The file RemBuild.exe was found to be: Known bad.

Malicious Activity Summary

remotehost remcos

Remcos family

Unsigned PE

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Checks SCSI registry key(s)

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-04-05 17:34

Signatures

Remcos family

remcos

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-04-05 17:34

Reported

2024-04-05 17:41

Platform

win11-20240221-en

Max time kernel

32s

Max time network

25s

Command Line

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

Signatures

Checks SCSI registry key(s)

Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A C:\Windows\System32\Taskmgr.exe N/A
Key value queried \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName C:\Windows\System32\Taskmgr.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000 C:\Windows\System32\Taskmgr.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Windows\System32\Taskmgr.exe N/A
Token: SeSystemProfilePrivilege N/A C:\Windows\System32\Taskmgr.exe N/A
Token: SeCreateGlobalPrivilege N/A C:\Windows\System32\Taskmgr.exe N/A

Processes

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

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

C:\Windows\System32\Taskmgr.exe

"C:\Windows\System32\Taskmgr.exe"

Network

Country Destination Domain Proto
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp
N/A 127.0.0.1:2404 tcp

Files

memory/3756-2-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-1-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-0-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-6-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-7-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-8-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-9-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-10-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-11-0x0000019F24E90000-0x0000019F24E91000-memory.dmp

memory/3756-12-0x0000019F24E90000-0x0000019F24E91000-memory.dmp