Malware Analysis Report

2024-12-07 22:46

Sample ID 240514-h34zcsfb95
Target Adro_ Documents.xz
SHA256 fda7025e4872a6eb6850640de1536f0025c2b24e99bd7f2d95ca94521f68dcce
Tags
remcos kc file collection persistence rat spyware stealer
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

fda7025e4872a6eb6850640de1536f0025c2b24e99bd7f2d95ca94521f68dcce

Threat Level: Known bad

The file Adro_ Documents.xz was found to be: Known bad.

Malicious Activity Summary

remcos kc file collection persistence rat spyware stealer

Remcos

Nirsoft

NirSoft WebBrowserPassView

NirSoft MailPassView

Reads user/profile data of web browsers

Executes dropped EXE

Accesses Microsoft Outlook accounts

Adds Run key to start application

Suspicious use of SetThreadContext

Program crash

Unsigned PE

Script User-Agent

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-05-14 07:16

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-05-14 07:16

Reported

2024-05-14 07:33

Platform

win7-20231129-en

Max time kernel

580s

Max time network

366s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe"

Signatures

Processes

C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe

"C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe"

C:\Windows\SysWOW64\WerFault.exe

C:\Windows\SysWOW64\WerFault.exe -u -p 2740 -s 676

Network

Country Destination Domain Proto
US 8.8.8.8:53 onedrive.live.com udp
US 13.107.137.11:443 onedrive.live.com tcp
US 13.107.137.11:443 onedrive.live.com tcp

Files

memory/2740-0-0x0000000000220000-0x0000000000221000-memory.dmp

memory/2740-1-0x0000000000400000-0x0000000000517000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2024-05-14 07:16

Reported

2024-05-14 07:33

Platform

win10v2004-20240426-en

Max time kernel

599s

Max time network

576s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe"

Signatures

Remcos

rat remcos

NirSoft MailPassView

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

NirSoft WebBrowserPassView

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

Nirsoft

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

Reads user/profile data of web browsers

spyware stealer

Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Users\Public\Libraries\vbgxdxoK.pif N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-4018855536-2201274732-320770143-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Koxdxgbv = "C:\\Users\\Public\\Koxdxgbv.url" C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe N/A

Suspicious use of SetThreadContext

Description Indicator Process Target
PID 1256 set thread context of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 set thread context of 400 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 set thread context of 1364 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 set thread context of 2472 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif

Script User-Agent

Description Indicator Process Target
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A

Suspicious behavior: MapViewOfSection

Description Indicator Process Target
N/A N/A C:\Users\Public\Libraries\vbgxdxoK.pif N/A
N/A N/A C:\Users\Public\Libraries\vbgxdxoK.pif N/A
N/A N/A C:\Users\Public\Libraries\vbgxdxoK.pif N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Public\Libraries\vbgxdxoK.pif N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Public\Libraries\vbgxdxoK.pif N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1256 wrote to memory of 2436 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Windows\SysWOW64\extrac32.exe
PID 1256 wrote to memory of 2436 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Windows\SysWOW64\extrac32.exe
PID 1256 wrote to memory of 2436 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Windows\SysWOW64\extrac32.exe
PID 1256 wrote to memory of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 1256 wrote to memory of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 1256 wrote to memory of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 1256 wrote to memory of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 1256 wrote to memory of 3716 N/A C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 400 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 400 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 400 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 1364 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 1364 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 1364 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 2472 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 2472 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif
PID 3716 wrote to memory of 2472 N/A C:\Users\Public\Libraries\vbgxdxoK.pif C:\Users\Public\Libraries\vbgxdxoK.pif

Processes

C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe

"C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe"

C:\Windows\SysWOW64\extrac32.exe

C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\Adro_ Documents.exe C:\\Users\\Public\\Libraries\\Koxdxgbv.PIF

C:\Users\Public\Libraries\vbgxdxoK.pif

C:\Users\Public\Libraries\vbgxdxoK.pif

C:\Users\Public\Libraries\vbgxdxoK.pif

C:\Users\Public\Libraries\vbgxdxoK.pif /stext "C:\Users\Admin\AppData\Local\Temp\hwrxyasllhtmzbgtczxnwnmvcgwtykpe"

C:\Users\Public\Libraries\vbgxdxoK.pif

C:\Users\Public\Libraries\vbgxdxoK.pif /stext "C:\Users\Admin\AppData\Local\Temp\jyfi"

C:\Users\Public\Libraries\vbgxdxoK.pif

C:\Users\Public\Libraries\vbgxdxoK.pif /stext "C:\Users\Admin\AppData\Local\Temp\uskaakng"

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 204.79.197.237:443 g.bing.com tcp
NL 23.62.61.161:443 www.bing.com tcp
US 8.8.8.8:53 58.55.71.13.in-addr.arpa udp
US 8.8.8.8:53 172.210.232.199.in-addr.arpa udp
US 8.8.8.8:53 237.197.79.204.in-addr.arpa udp
US 8.8.8.8:53 161.61.62.23.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
NL 23.62.61.161:443 www.bing.com tcp
US 8.8.8.8:53 onedrive.live.com udp
US 13.107.137.11:443 onedrive.live.com tcp
US 13.107.137.11:443 onedrive.live.com tcp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 p1gzgg.by.files.1drv.com udp
US 13.107.42.12:443 p1gzgg.by.files.1drv.com tcp
US 8.8.8.8:53 11.137.107.13.in-addr.arpa udp
US 8.8.8.8:53 12.42.107.13.in-addr.arpa udp
PL 91.223.3.151:4508 tcp
US 8.8.8.8:53 151.3.223.91.in-addr.arpa udp
PL 91.223.3.151:4508 tcp
US 8.8.8.8:53 geoplugin.net udp
NL 178.237.33.50:80 geoplugin.net tcp
US 8.8.8.8:53 50.33.237.178.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 21.121.18.2.in-addr.arpa udp
US 8.8.8.8:53 26.35.223.20.in-addr.arpa udp
US 8.8.8.8:53 14.227.111.52.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 55.36.223.20.in-addr.arpa udp
US 8.8.8.8:53 17.173.189.20.in-addr.arpa udp

Files

memory/1256-0-0x00000000021D0000-0x00000000021D1000-memory.dmp

memory/1256-1-0x0000000000400000-0x0000000000517000-memory.dmp

C:\Users\Public\Libraries\vbgxdxoK.pif

MD5 c116d3604ceafe7057d77ff27552c215
SHA1 452b14432fb5758b46f2897aeccd89f7c82a727d
SHA256 7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301
SHA512 9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

memory/3716-5-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-10-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-8-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-12-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-15-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-16-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-17-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-18-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-20-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-19-0x0000000000400000-0x0000000001400000-memory.dmp

memory/400-24-0x0000000000400000-0x0000000000478000-memory.dmp

memory/1364-39-0x0000000000400000-0x0000000000462000-memory.dmp

memory/2472-38-0x0000000000400000-0x0000000000424000-memory.dmp

memory/400-37-0x0000000000400000-0x0000000000478000-memory.dmp

memory/2472-34-0x0000000000400000-0x0000000000424000-memory.dmp

memory/2472-33-0x0000000000400000-0x0000000000424000-memory.dmp

memory/1364-32-0x0000000000400000-0x0000000000462000-memory.dmp

memory/2472-30-0x0000000000400000-0x0000000000424000-memory.dmp

memory/1364-29-0x0000000000400000-0x0000000000462000-memory.dmp

memory/3716-43-0x0000000000400000-0x0000000001400000-memory.dmp

memory/400-27-0x0000000000400000-0x0000000000478000-memory.dmp

memory/1364-26-0x0000000000400000-0x0000000000462000-memory.dmp

memory/400-25-0x0000000000400000-0x0000000000478000-memory.dmp

memory/400-21-0x0000000000400000-0x0000000000478000-memory.dmp

memory/400-48-0x0000000000400000-0x0000000000478000-memory.dmp

memory/3716-54-0x000000004A180000-0x000000004A199000-memory.dmp

memory/3716-55-0x000000004A180000-0x000000004A199000-memory.dmp

memory/3716-52-0x000000004A180000-0x000000004A199000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\hwrxyasllhtmzbgtczxnwnmvcgwtykpe

MD5 0c71400795defb1ddf2816dcb2440470
SHA1 a9f25ddc014a44b58a890ac42ea47d98a3f754a3
SHA256 eef6222f63aae44aec7addd2cdf1d348af92b32e0be1d4c857c48d9a941d9dac
SHA512 4d5fd766afe850d8282b85ca0ff3ef36e225e754254f43e1e3e0147675d40f901096199e666310e7f70b6cfbe9f33f3dbe4a063fbd4df7267190bad5121efabf

memory/3716-56-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-59-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-61-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-62-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-63-0x0000000000400000-0x0000000000482000-memory.dmp

C:\ProgramData\remcos\logs.dat

MD5 aafcaf093f58d0398d6f5c65147b165f
SHA1 89f96a6198f02811ca8063f66661900eb2835319
SHA256 2b672581b739d9b892db0a2673a51234d99fddded1e25756df23b6ca810283df
SHA512 e90b69b8e8e2ddf1d5042c604f4d5e3a1a86fb320b6c22cae02bef099ffb5e3513ec0f4047afedb0ba8df8129dbc6ddba6349bada980928f09534b0e0c084d35

memory/3716-67-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-70-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-72-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-73-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-75-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-78-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-81-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-83-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-84-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-86-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-89-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-92-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-94-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-95-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-97-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-100-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-103-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-106-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-105-0x0000000000400000-0x0000000001400000-memory.dmp

memory/3716-108-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-111-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3716-114-0x0000000000400000-0x0000000000482000-memory.dmp