Malware Analysis Report

2024-11-16 12:23

Sample ID 240319-c16ghsfb25
Target Automatic_converter_rff_to_mp4.exe
SHA256 d4c83205cf6f3098ab6a757312525f4d14a57a819306eeea5c0d022b00b38cf3
Tags
discovery evasion exploit persistence
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

d4c83205cf6f3098ab6a757312525f4d14a57a819306eeea5c0d022b00b38cf3

Threat Level: Known bad

The file Automatic_converter_rff_to_mp4.exe was found to be: Known bad.

Malicious Activity Summary

discovery evasion exploit persistence

Modifies WinLogon for persistence

Disables Task Manager via registry modification

Possible privilege escalation attempt

Checks computer location settings

Executes dropped EXE

Modifies file permissions

Drops file in System32 directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of WriteProcessMemory

Suspicious use of AdjustPrivilegeToken

Suspicious behavior: EnumeratesProcesses

Modifies registry class

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-19 02:33

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-19 02:33

Reported

2024-03-19 02:38

Platform

win10v2004-20240226-en

Max time kernel

300s

Max time network

54s

Command Line

"C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe"

Signatures

Modifies WinLogon for persistence

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty" C:\Windows\System32\WormLocker2.0.exe N/A

Disables Task Manager via registry modification

evasion

Possible privilege escalation attempt

exploit
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Checks computer location settings

Description Indicator Process Target
Key value queried \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\Control Panel\International\Geo\Nation C:\Windows\System32\WormLocker2.0.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A

Executes dropped EXE

Description Indicator Process Target
N/A N/A C:\Windows\System32\WormLocker2.0.exe N/A

Modifies file permissions

discovery
Description Indicator Process Target
N/A N/A C:\Windows\system32\takeown.exe N/A
N/A N/A C:\Windows\system32\icacls.exe N/A

Drops file in System32 directory

Description Indicator Process Target
File opened for modification C:\Windows\System32\LogonUItrue.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
File created C:\Windows\System32\LogonUI.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
File opened for modification C:\Windows\System32\LogonUIinf.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
File opened for modification C:\Windows\System32\ransom_voice.vbs C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
File opened for modification C:\Windows\System32\WormLocker2.0.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
File created C:\Windows\System32\LogonUItrue.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A

Enumerates physical storage devices

Modifies registry class

Description Indicator Process Target
Key created \REGISTRY\USER\S-1-5-21-275798769-4264537674-1142822080-1000_Classes\Local Settings C:\Windows\System32\WormLocker2.0.exe N/A

Suspicious behavior: EnumeratesProcesses

Description Indicator Process Target
N/A N/A C:\Windows\System32\WormLocker2.0.exe N/A
N/A N/A C:\Windows\System32\WormLocker2.0.exe N/A

Suspicious use of AdjustPrivilegeToken

Description Indicator Process Target
Token: SeTakeOwnershipPrivilege N/A C:\Windows\system32\takeown.exe N/A
Token: SeDebugPrivilege N/A C:\Windows\System32\WormLocker2.0.exe N/A
Token: 33 N/A C:\Windows\system32\AUDIODG.EXE N/A
Token: SeIncBasePriorityPrivilege N/A C:\Windows\system32\AUDIODG.EXE N/A

Processes

C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe

"C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe"

C:\Windows\System32\cmd.exe

"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant "%username%:F"

C:\Windows\system32\takeown.exe

takeown /f C:\Windows\System32

C:\Windows\system32\icacls.exe

icacls C:\Windows\System32 /grant "Admin:F"

C:\Windows\System32\WormLocker2.0.exe

"C:\Windows\System32\WormLocker2.0.exe"

C:\Windows\System32\WScript.exe

"C:\Windows\System32\WScript.exe" "C:\Windows\System32\ransom_voice.vbs"

C:\Windows\system32\AUDIODG.EXE

C:\Windows\system32\AUDIODG.EXE 0x50c 0x518

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 8.8.8.8:53 udp

Files

memory/4996-0-0x0000000000CD0000-0x0000000000D26000-memory.dmp

memory/4996-1-0x00007FFFA4380000-0x00007FFFA4E41000-memory.dmp

memory/4996-2-0x000000001B900000-0x000000001B910000-memory.dmp

C:\Windows\System32\WormLocker2.0.exe

MD5 041aa5e99ae545dac5f9306bb20d869e
SHA1 88ea126645bfd418abba44cca4a16adf12084d2f
SHA256 830c271c8aca775457a090a51c93ad08f9665361eeeaa3fda3f9ae032202ad73
SHA512 4b8007dddd519c77bb596f6d17f270da62b236894b6fd7f1c528e553b1aac3a7f9c0df4bb40b678461f70bde3c5a8ac4b5e97e5372dd127a8184862c7f6f4c7c

memory/4820-22-0x00007FFFA4380000-0x00007FFFA4E41000-memory.dmp

memory/4820-21-0x0000000000F40000-0x0000000000F62000-memory.dmp

memory/4996-23-0x00007FFFA4380000-0x00007FFFA4E41000-memory.dmp

memory/4820-24-0x000000001BB80000-0x000000001BB90000-memory.dmp

memory/4820-27-0x000000001BB80000-0x000000001BB90000-memory.dmp

memory/4820-28-0x000000001BB80000-0x000000001BB90000-memory.dmp

C:\Windows\System32\ransom_voice.vbs

MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615

memory/4820-98-0x00007FFFA4380000-0x00007FFFA4E41000-memory.dmp

memory/4820-99-0x000000001BB80000-0x000000001BB90000-memory.dmp

memory/4820-100-0x000000001BB80000-0x000000001BB90000-memory.dmp

memory/4820-101-0x000000001BB80000-0x000000001BB90000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_ABDE84A644AC404FA4EC352D7180DEFC.dat

MD5 0121046d89b6ab0c15ce49698782408c
SHA1 0d13c477837f4351687f784053e52929bffabb08
SHA256 de43b5984b285e73d69f2aa55982547cd723e277566649d64f55929ffa354cd8
SHA512 85d8c7a20fde24a081d79317f1d8a47c70bb5174abf296f35716d151bd69312db1a60830290f71f31984b103eaccc5217d599a99f1f2b8d0b7275e4a829f6b27