Analysis Overview
SHA256
d4c83205cf6f3098ab6a757312525f4d14a57a819306eeea5c0d022b00b38cf3
Threat Level: Known bad
The file Automatic_converter_rff_to_mp4.exe was found to be: Known bad.
Malicious Activity Summary
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
Enterprise Matrix V15
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
Signatures
Modifies WinLogon for 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
Possible privilege escalation attempt
| 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
| 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 |
Suspicious use of WriteProcessMemory
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 |