Malware Analysis Report

2024-11-16 12:27

Sample ID 240303-zxkrzage5v
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

Possible privilege escalation attempt

Disables Task Manager via registry modification

Executes dropped EXE

Checks computer location settings

Modifies file permissions

Drops file in System32 directory

Enumerates physical storage devices

Unsigned PE

Modifies registry class

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2024-03-03 21:05

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-03-03 21:05

Reported

2024-03-03 21:07

Platform

win10v2004-20240226-en

Max time kernel

85s

Max time network

84s

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-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation C:\Windows\System32\WormLocker2.0.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\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
File opened for modification 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-1-5-21-3808065738-1666277613-1125846146-1000_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 0x4f8 0x504

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe

"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3804 --field-trial-handle=2264,i,15001568551143786084,90255922961447677,262144 --variations-seed-version /prefetch:8

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 13.107.246.64:443 tcp

Files

memory/2548-0-0x0000000000650000-0x00000000006A6000-memory.dmp

memory/2548-1-0x00007FFD76680000-0x00007FFD77141000-memory.dmp

memory/2548-2-0x000000001B310000-0x000000001B320000-memory.dmp

memory/2548-7-0x000000001B310000-0x000000001B320000-memory.dmp

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

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

memory/1980-18-0x0000000000720000-0x0000000000742000-memory.dmp

memory/1980-19-0x00007FFD76680000-0x00007FFD77141000-memory.dmp

memory/2548-21-0x00007FFD76680000-0x00007FFD77141000-memory.dmp

memory/1980-22-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-23-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-24-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-27-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

C:\Windows\System32\ransom_voice.vbs

MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615

memory/1980-102-0x00007FFD76680000-0x00007FFD77141000-memory.dmp

memory/1980-106-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-107-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-108-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

memory/1980-109-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

C:\Windows\System32\LogonUItrue.exe

MD5 893144fe49aa16124b5bd3034e79bbc6
SHA1 fbf39a288fc46cbf0620cfd297395a8fb4fbcdad
SHA256 cf01e46c146699f6c0e3dd447043f59bc9438dbbcb9563af6c60ebc6d82727f2
SHA512 c921ee3786717ac1f9e1981e35494f33d26d153afb335c52219830261f84155383d5ac9ff0ea1d7f3f6913b28c878ce6b5ea350f60ed9a9bf1ac006596fd4c68

C:\Windows\System32\LogonUIinf.exe

MD5 31618202eb911f6606405d237e098ad0
SHA1 829365de595b00bd4ea5bf83a1f344f5288c100d
SHA256 7944285565408818fae6f861d45d7a722f5ac630da98fb762826f061831e46f4
SHA512 db157b67c9b5f966d3ada70ec77cd735f59ef595e786377c6fb2a8b487a69fc77f828897a97b537f6e296bfbe670686ebe4f4d521295a2edd6fc07f6809214ca

memory/1980-112-0x000000001B2E0000-0x000000001B2F0000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_C35A447AA3874031A193490A6667A59C.dat

MD5 9c981be331ac6a5aaabf1d9adc19d9ef
SHA1 25a5f876f6c8bc15c6aa0f6122ac92ed1974802d
SHA256 0e1713838d86c598aa4365eb913640120b535011e0b3e737fa472f1ce74b1eb3
SHA512 11e1557c8ec49cc3fc7f8881800ace25bcbb91714a1544cbb318df7116b7d7e16e162cd1384f3a64e1a633198ae842c8ce9def1c9d55f07eba714608d5b0ff36