Malware Analysis Report

2025-06-16 01:18

Sample ID 231206-pr5j3sdb3s
Target clientfmUx.exe
SHA256 06b9b10a15c0b2856620dd4469c8a976bfbc42e506747a04a763dbeeaf1ecb79
Tags
remcos remotehost 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

06b9b10a15c0b2856620dd4469c8a976bfbc42e506747a04a763dbeeaf1ecb79

Threat Level: Known bad

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

Malicious Activity Summary

remcos remotehost rat

Remcos

Suspicious use of SetThreadContext

Enumerates physical storage devices

Unsigned PE

Suspicious use of SetWindowsHookEx

Suspicious behavior: MapViewOfSection

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2023-12-06 12:34

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2023-12-06 12:34

Reported

2023-12-06 12:37

Platform

win7-20231023-en

Max time kernel

122s

Max time network

126s

Command Line

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

Signatures

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A

Processes

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

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

Network

N/A

Files

memory/2188-0-0x0000000000400000-0x0000000000488000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2023-12-06 12:34

Reported

2023-12-06 12:37

Platform

win10v2004-20231127-en

Max time kernel

147s

Max time network

150s

Command Line

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

Signatures

Remcos

rat remcos

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 3644 set thread context of 1920 N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe C:\Windows\SysWOW64\cmd.exe

Enumerates physical storage devices

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A
N/A N/A C:\Windows\SysWOW64\cmd.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\clientfmUx.exe N/A

Processes

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

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

C:\Windows\SysWOW64\cmd.exe

C:\Windows\SysWOW64\cmd.exe

C:\Windows\SysWOW64\explorer.exe

C:\Windows\SysWOW64\explorer.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 146.78.124.51.in-addr.arpa udp
US 8.8.8.8:53 i.imgur.com udp
NL 199.232.148.193:443 i.imgur.com tcp
US 8.8.8.8:53 80.14.97.104.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 193.148.232.199.in-addr.arpa udp
US 8.8.8.8:53 9.228.82.20.in-addr.arpa udp
US 8.8.8.8:53 0.159.190.20.in-addr.arpa udp
US 8.8.8.8:53 198.1.85.104.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 204.79.197.200:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 200.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 2.136.104.51.in-addr.arpa udp
US 8.8.8.8:53 26.165.165.52.in-addr.arpa udp
US 8.8.8.8:53 206.23.85.13.in-addr.arpa udp
US 8.8.8.8:53 25.14.97.104.in-addr.arpa udp
US 8.8.8.8:53 retghrtgwtrgtg.bounceme.net udp
RU 91.215.85.63:3839 retghrtgwtrgtg.bounceme.net tcp
US 8.8.8.8:53 63.85.215.91.in-addr.arpa udp
US 8.8.8.8:53 81.14.97.104.in-addr.arpa udp
US 8.8.8.8:53 29.243.111.52.in-addr.arpa udp
US 8.8.8.8:53 27.73.42.20.in-addr.arpa udp

Files

memory/3644-0-0x0000000000400000-0x0000000000488000-memory.dmp

memory/3644-1-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/3644-2-0x00007FFF47830000-0x00007FFF47A25000-memory.dmp

memory/3644-3-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/3644-4-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/3644-5-0x0000000074D20000-0x0000000074E9B000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\19e09be8

MD5 400104c285806db2ea291a5a0cd98f09
SHA1 8ffb20345435684f209ba15a6031d5207c7205fa
SHA256 2ed05e3352352b168ff6ccd463fc97bc53e107ab63b91eff8e9b409651c6624e
SHA512 c29d812515686566864da0aac71731a80416c9a0264e3913c32f127b0451e7aeb4520ad10ad3c56ee7dae19e73b9f5dc97443fe90936da7bfb5e7b170bf75391

memory/1920-7-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/1920-9-0x00007FFF47830000-0x00007FFF47A25000-memory.dmp

memory/1920-11-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/1920-12-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/1920-14-0x0000000074D20000-0x0000000074E9B000-memory.dmp

memory/3016-15-0x00007FFF47830000-0x00007FFF47A25000-memory.dmp

memory/3016-16-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-19-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-20-0x00000000003E0000-0x0000000000813000-memory.dmp

memory/3016-21-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-22-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-23-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-24-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-25-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-26-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-27-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-28-0x0000000000920000-0x00000000009A4000-memory.dmp

memory/3016-29-0x0000000000920000-0x00000000009A4000-memory.dmp