Malware Analysis Report

2024-12-07 22:14

Sample ID 240814-2l2bpavapl
Target 39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.zip
SHA256 ac43825c40c583e02818f1f76e97376fa1f94451e41acc8ce58afc84f081577d
Tags
remcos remotehost collection credential_access discovery rat 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 Overview

score
10/10

SHA256

ac43825c40c583e02818f1f76e97376fa1f94451e41acc8ce58afc84f081577d

Threat Level: Known bad

The file 39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.zip was found to be: Known bad.

Malicious Activity Summary

remcos remotehost collection credential_access discovery rat stealer

Remcos

Credentials from Password Stores: Credentials from Web Browsers

NirSoft MailPassView

NirSoft WebBrowserPassView

Detected Nirsoft tools

Accesses Microsoft Outlook accounts

Suspicious use of SetThreadContext

Drops file in Windows directory

System Location Discovery: System Language Discovery

Unsigned PE

Suspicious behavior: GetForegroundWindowSpam

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: MapViewOfSection

Suspicious use of SetWindowsHookEx

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-08-14 22:40

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-08-14 22:40

Reported

2024-08-14 22:44

Platform

win11-20240802-en

Max time kernel

154s

Max time network

154s

Command Line

"C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe"

Signatures

Remcos

rat remcos

Credentials from Password Stores: Credentials from Web Browsers

credential_access stealer

Detected Nirsoft tools

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

NirSoft MailPassView

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

NirSoft WebBrowserPassView

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

Accesses Microsoft Outlook accounts

collection
Description Indicator Process Target
Key opened \REGISTRY\USER\S-1-5-21-6179872-1886041298-1573312864-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A

Drops file in Windows directory

Description Indicator Process Target
File opened for modification C:\Windows\Panther\UnattendGC\setupact.log C:\Windows\System32\oobe\UserOOBEBroker.exe N/A
File opened for modification C:\Windows\Panther\UnattendGC\setuperr.log C:\Windows\System32\oobe\UserOOBEBroker.exe N/A
File opened for modification C:\Windows\Panther\UnattendGC\diagerr.xml C:\Windows\System32\oobe\UserOOBEBroker.exe N/A
File opened for modification C:\Windows\Panther\UnattendGC\diagwrn.xml C:\Windows\System32\oobe\UserOOBEBroker.exe N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\SysWOW64\DllHost.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A

Suspicious behavior: GetForegroundWindowSpam

Description Indicator Process Target
N/A N/A C:\Windows\system32\OpenWith.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeDebugPrivilege N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Windows\system32\OpenWith.exe N/A
N/A N/A C:\Windows\system32\OpenWith.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 3280 wrote to memory of 3984 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 3984 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 3984 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 3280 wrote to memory of 4356 N/A C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 568 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 568 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 568 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 568 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 1376 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 1376 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 1376 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 1376 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 3660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 3660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 3660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe
PID 4356 wrote to memory of 3660 N/A C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

Processes

C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe

"C:\Users\Admin\AppData\Local\Temp\39c096e77e2ce57c75d07b577dbf5899b5e883a3d3435a0a3d0313a52718496a.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\acydjhnbybzxb"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\ledoczyvmjrcmrfwj"

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Caspol.exe /stext "C:\Users\Admin\AppData\Local\Temp\vyigcsiwarjhoxbatjav"

C:\Windows\SysWOW64\DllHost.exe

C:\Windows\SysWOW64\DllHost.exe /Processid:{06622D85-6856-4460-8DE1-A81921B41C4B}

C:\Windows\system32\rundll32.exe

"C:\Windows\system32\rundll32.exe" C:\Windows\system32\shell32.dll,Control_RunDLL C:\Windows\System32\srchadmin.dll ,

C:\Windows\system32\svchost.exe

C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc

C:\Windows\System32\oobe\UserOOBEBroker.exe

C:\Windows\System32\oobe\UserOOBEBroker.exe -Embedding

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe -Embedding

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

C:\Windows\system32\OpenWith.exe

C:\Windows\system32\OpenWith.exe -Embedding

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\18.151.0729.0013\FileCoAuth.exe -Embedding

Network

Country Destination Domain Proto
LT 194.169.175.190:2404 tcp
US 8.8.8.8:53 190.175.169.194.in-addr.arpa udp
LT 194.169.175.190:2404 tcp
LT 194.169.175.190:2404 tcp
GB 104.86.110.91:443 tcp
GB 104.86.110.91:443 tcp
US 20.189.173.10:443 browser.pipe.aria.microsoft.com tcp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 138.32.126.40.in-addr.arpa udp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
GB 92.123.142.163:443 r.bing.com tcp
US 8.8.8.8:53 43.229.111.52.in-addr.arpa udp
GB 92.123.142.153:443 www.bing.com tcp
GB 23.62.195.195:443 cxcs.microsoft.net tcp

Files

memory/3280-0-0x00007FFA1A573000-0x00007FFA1A575000-memory.dmp

memory/3280-1-0x0000018E49E30000-0x0000018E49EDC000-memory.dmp

memory/3280-2-0x0000018E643A0000-0x0000018E6441E000-memory.dmp

memory/3280-3-0x00007FFA1A570000-0x00007FFA1B032000-memory.dmp

memory/3280-4-0x0000018E4A2E0000-0x0000018E4A2F4000-memory.dmp

memory/4356-5-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-7-0x0000000000400000-0x0000000000482000-memory.dmp

memory/3280-9-0x00007FFA1A570000-0x00007FFA1B032000-memory.dmp

memory/4356-8-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-10-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-11-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-12-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-14-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-13-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-16-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-15-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-17-0x0000000000400000-0x0000000000482000-memory.dmp

memory/568-18-0x0000000000400000-0x0000000000478000-memory.dmp

memory/1376-19-0x0000000000400000-0x0000000000462000-memory.dmp

memory/1376-25-0x0000000000400000-0x0000000000462000-memory.dmp

memory/568-30-0x0000000000400000-0x0000000000478000-memory.dmp

memory/1376-31-0x0000000000400000-0x0000000000462000-memory.dmp

memory/1376-35-0x0000000000400000-0x0000000000462000-memory.dmp

memory/1376-37-0x0000000000400000-0x0000000000462000-memory.dmp

memory/3660-36-0x0000000000400000-0x0000000000424000-memory.dmp

memory/3660-29-0x0000000000400000-0x0000000000424000-memory.dmp

memory/568-28-0x0000000000400000-0x0000000000478000-memory.dmp

memory/3660-27-0x0000000000400000-0x0000000000424000-memory.dmp

memory/3660-26-0x0000000000400000-0x0000000000424000-memory.dmp

memory/568-24-0x0000000000400000-0x0000000000478000-memory.dmp

memory/3660-21-0x0000000000400000-0x0000000000424000-memory.dmp

memory/568-39-0x0000000000400000-0x0000000000478000-memory.dmp

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

MD5 f3b25701fe362ec84616a93a45ce9998
SHA1 d62636d8caec13f04e28442a0a6fa1afeb024bbb
SHA256 b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209
SHA512 98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

memory/4356-41-0x0000000010000000-0x0000000010019000-memory.dmp

memory/4356-45-0x0000000010000000-0x0000000010019000-memory.dmp

memory/4356-44-0x0000000010000000-0x0000000010019000-memory.dmp

memory/4356-46-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-47-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-48-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-49-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-50-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-51-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-55-0x0000000000400000-0x0000000000482000-memory.dmp

C:\Users\Admin\AppData\Local\Microsoft\OneDrive\logs\Common\FileCoAuth-2024-8-14.2242.1800.1.odl

MD5 ccfa91c2843af000942a31acd009a58b
SHA1 82e0b7386d84fcb3e4417d73d7fc3277d524261b
SHA256 8158177911b2fcb9a5e996c4f8c2d5b61c907dc9d41896e1f01f047bbc29afff
SHA512 567ed0d86cce52fe5321bf3a9861cf1048fc802305b94ed7cbb8301f8a05532cfa5cba7c08bb32f21fcf6d888f29c9ff7e3c96e1a666504d51d996640eadcdc4

memory/4356-61-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-62-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-63-0x0000000000400000-0x0000000000482000-memory.dmp

memory/4356-64-0x0000000000400000-0x0000000000482000-memory.dmp