Analysis
- max time kernel
150s - max time network
122s - platform
windows10-2004_x64 - resource
win10v2004-20231222-en - resource tags
- submitted
25/12/2023, 04:20
General
- Target 04df8dd30da8b5853f48cc1ac9b695a8.exe
- Size 6.1MB
- Sample231225-ex7lhsfcdp
- SHA256 78f4dd4b0e0bff6009f56a8b97332f600cec39e3c1d0e1cac6c7ee47a4bb9201
Score
10/10
Malware Config
Extracted
Path
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C:\Users\Admin\AppData\Local\Temp\LegionReadMe.txt
Ransom Note
- Ooops! All your important files are encrypted! What happend to my computer? All your important files are encrypted. No one can help you to restore files without our special decryptor. Backups were either encrypted or deleted. Shadow copies also removed. If you want to restore some of your files for free write to email (contact is below) and attach 2-3 encrypted files. You will receive decrypted samples. To decrypt other files you have to pay $50. How do i pay? Payment is accepted in Bitcoin only. Please check the current price of Bitcoin and buy some Bitcoins. And send the correct amount to the address specified at the bottom of the sheet. Contact: 1.Download Tor browser (https://www.torproject.org/) 2.Create account on mail2tor (http://mail2tor2zyjdctd.onion/) 3.Write email to us ([email protected]) In case of no anwser in 72 hours write us to this email: [email protected] What if i already paid? Send your Bitcoin wallet ID to e-mail provided above. Attention! 1.Do not modify encrypted files. 2.Do not try decrypt your data using third party software, it may cause pernament data loss. Our Bitcoin address: 131fjhrB4wH8j6adZXudp1Wn23pR33tpAh
Wallets
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131fjhrB4wH8j6adZXudp1Wn23pR33tpAh
URLs
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http://mail2tor2zyjdctd.onion/
Signatures
- Modifies WinLogon for persistence 2 TTPs 1 IoCs
- Renames multiple (560) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
- Disables Task Manager via registry modification
- Possible privilege escalation attempt 7 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Modifies file permissions 1 TTPs 7 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Sets desktop wallpaper using registry 2 TTPs 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Modifies registry class 1 IoCs
- Opens file in notepad (likely ransom note) 1 IoCs
- Suspicious behavior: EnumeratesProcesses 64 IoCs
- Suspicious use of AdjustPrivilegeToken 6 IoCs
- Suspicious use of WriteProcessMemory 22 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\04df8dd30da8b5853f48cc1ac9b695a8.exe"C:\Users\Admin\AppData\Local\Temp\04df8dd30da8b5853f48cc1ac9b695a8.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Sets desktop wallpaper using registry
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant %username%:F && takeown /f C:\Windows\System32\drivers && icacls C:\Windows\System32\drivers /grant %username%:F && takeown /f C:\Windows\System32\LogonUI.exe && icacls C:\Windows\System32\LogonUI.exe /grant %username%:F && takeown /f C:\bootmgr && icacls C:\bootmgr /grant %username%:F && attrib -s -r -h C:\bootmgr && del C:\bootmgr && Exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\icacls.exeicacls C:\Windows\System32 /grant Admin:F3⤵
- Possible privilege escalation attempt
- Modifies file permissions
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C:\Windows\system32\takeown.exetakeown /f C:\Windows\System323⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\icacls.exeicacls C:\Windows\System32\drivers /grant Admin:F3⤵
- Possible privilege escalation attempt
- Modifies file permissions
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C:\Windows\system32\takeown.exetakeown /f C:\Windows\System32\drivers3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\takeown.exetakeown /f C:\Windows\System32\LogonUI.exe3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\takeown.exetakeown /f C:\bootmgr3⤵
- Possible privilege escalation attempt
- Modifies file permissions
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\icacls.exeicacls C:\Windows\System32\LogonUI.exe /grant Admin:F3⤵
- Possible privilege escalation attempt
- Modifies file permissions
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C:\Windows\system32\NOTEPAD.EXE"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\LegionReadMe.txt2⤵
- Opens file in notepad (likely ransom note)
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /k rundll32 user32.dll,UpdatePerUserSystemParameters && Exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\rundll32.exerundll32 user32.dll,UpdatePerUserSystemParameters1⤵
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
000003.log
winword.exe_Rules.xml
settings.dat
LegionReadMe.txt
Microsoft .NET Framework 4.7.2 Setup_20231222_234415402.html
memory/3764-691-0x000000001C0F0000-0x000000001C100000-memory.dmp
memory/3764-1-0x00007FF819610000-0x00007FF81A0D1000-memory.dmp
memory/3764-616-0x00007FF819610000-0x00007FF81A0D1000-memory.dmp
memory/3764-2-0x000000001C0F0000-0x000000001C100000-memory.dmp
memory/3764-1129-0x000000001C0F0000-0x000000001C100000-memory.dmp
memory/3764-0-0x0000000000F90000-0x00000000015B0000-memory.dmp
memory/3764-1132-0x000000001C0F0000-0x000000001C100000-memory.dmp
memory/3764-1133-0x000000001C0F0000-0x000000001C100000-memory.dmp
memory/3764-1134-0x000000001C0F0000-0x000000001C100000-memory.dmp