Malware Analysis Report

2024-09-11 04:17

Sample ID 240620-scnvkaxfqp
Target Worm Locker2.0(ransomware).zip
SHA256 995df061cec051f1964775932be424ee3da5a4ee91e2b9a17f7a625894088dbf
Tags
discovery evasion exploit persistence
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

995df061cec051f1964775932be424ee3da5a4ee91e2b9a17f7a625894088dbf

Threat Level: Known bad

The file Worm Locker2.0(ransomware).zip 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

Modifies file permissions

Drops file in System32 directory

Unsigned PE

Enumerates physical storage devices

Suspicious use of AdjustPrivilegeToken

Modifies registry class

Suspicious behavior: EnumeratesProcesses

Suspicious use of WriteProcessMemory

MITRE ATT&CK Matrix V13

Initial Access
TA0001
Execution
TA0002
Persistence
TA0003
Boot or Logon Autostart Execution
T1547
Winlogon Helper DLL
T1547.004
Privilege Escalation
TA0004
Boot or Logon Autostart Execution
T1547
Winlogon Helper DLL
T1547.004
Defense Evasion
TA0005
Modify Registry
T1112
File and Directory Permissions Modification
T1222
Credential Access
TA0006
Discovery
TA0007
System Information Discovery
T1082
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-20 14:58

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-20 14:58

Reported

2024-06-20 15:00

Platform

win10-20240611-en

Max time kernel

61s

Max time network

23s

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

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
File created C:\Windows\System32\LogonUI.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-1-5-21-1453213197-474736321-1741884505-1000_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

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

Description Indicator Process Target
PID 3940 wrote to memory of 4632 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 3940 wrote to memory of 4632 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 4632 wrote to memory of 3808 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 4632 wrote to memory of 3808 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 4632 wrote to memory of 3700 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 4632 wrote to memory of 3700 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 3940 wrote to memory of 4464 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 3940 wrote to memory of 4464 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 4464 wrote to memory of 1480 N/A C:\Windows\System32\WormLocker2.0.exe C:\Windows\System32\WScript.exe
PID 4464 wrote to memory of 1480 N/A C:\Windows\System32\WormLocker2.0.exe C:\Windows\System32\WScript.exe

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 0x410

Network

N/A

Files

memory/3940-0-0x00007FFDA9383000-0x00007FFDA9384000-memory.dmp

memory/3940-1-0x00000000006B0000-0x0000000000706000-memory.dmp

memory/3940-2-0x00007FFDA9380000-0x00007FFDA9D6C000-memory.dmp

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

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

memory/4464-15-0x0000000000F20000-0x0000000000F42000-memory.dmp

memory/3940-16-0x00007FFDA9380000-0x00007FFDA9D6C000-memory.dmp

C:\Windows\System32\ransom_voice.vbs

MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615

C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_C62C229F27AE42829F57C6CDE20F82CD.dat

MD5 18e0e2cc324271979d028d2ea8f5f7ec
SHA1 b1f376a022f82666bd9d66f867bbe33f170ed342
SHA256 3577446eaf23760879ab4eee83231a9b87ceacddd603ef556719d9e4bfdc7c69
SHA512 4078d30ec666e867cee948cc2ceaf695f7400ac69d7caf09cf44cb7f5c8c1637dd0c43b8f96b0248b6a7dd3884e8e82389e2ef60a70b3b142a6579efd99d79e6