Malware Analysis Report

2024-09-11 05:43

Sample ID 240602-mplm3sbd63
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 Matrix

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

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

Disables Task Manager via registry modification

Possible privilege escalation attempt

Executes dropped EXE

Modifies file permissions

Checks computer location settings

Drops file in System32 directory

Enumerates physical storage devices

Unsigned PE

Suspicious use of WriteProcessMemory

Suspicious behavior: EnumeratesProcesses

Modifies registry class

Suspicious use of AdjustPrivilegeToken

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
Query Registry
T1012
Lateral Movement
TA0008
Collection
TA0009
Exfiltration
TA0010
Command and Control
TA0011
Impact
TA0040
Resource Development
TA0042
Reconnaissance
TA0043

Analysis: static1

Detonation Overview

Reported

2024-06-02 10:38

Signatures

Unsigned PE

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

Analysis: behavioral1

Detonation Overview

Submitted

2024-06-02 10:38

Reported

2024-06-02 10:39

Platform

win7-20240508-en

Max time kernel

43s

Max time network

16s

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\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
File opened for modification C:\Windows\System32\LogonUIinf.exe C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe N/A

Enumerates physical storage devices

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

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 1872 wrote to memory of 2204 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 1872 wrote to memory of 2204 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 1872 wrote to memory of 2204 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 2204 wrote to memory of 2284 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 2204 wrote to memory of 2284 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 2204 wrote to memory of 2284 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 2204 wrote to memory of 2960 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 2204 wrote to memory of 2960 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 2204 wrote to memory of 2960 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1872 wrote to memory of 2648 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 1872 wrote to memory of 2648 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 1872 wrote to memory of 2648 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 2648 wrote to memory of 316 N/A C:\Windows\System32\WormLocker2.0.exe C:\Windows\System32\WScript.exe
PID 2648 wrote to memory of 316 N/A C:\Windows\System32\WormLocker2.0.exe C:\Windows\System32\WScript.exe
PID 2648 wrote to memory of 316 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\SysWOW64\DllHost.exe

C:\Windows\SysWOW64\DllHost.exe /Processid:{3F6B5E16-092A-41ED-930B-0B4125D91D4E}

Network

N/A

Files

memory/1872-0-0x000007FEF54A3000-0x000007FEF54A4000-memory.dmp

memory/1872-1-0x0000000000140000-0x0000000000196000-memory.dmp

memory/1872-2-0x000007FEF54A0000-0x000007FEF5E8C000-memory.dmp

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

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

memory/1872-13-0x000007FEF54A0000-0x000007FEF5E8C000-memory.dmp

memory/2648-14-0x0000000000980000-0x00000000009A2000-memory.dmp

C:\Windows\System32\ransom_voice.vbs

MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615

Analysis: behavioral2

Detonation Overview

Submitted

2024-06-02 10:38

Reported

2024-06-02 10:41

Platform

win10v2004-20240508-en

Max time kernel

150s

Max time network

93s

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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation C:\Windows\System32\WormLocker2.0.exe N/A
Key value queried \REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.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-1-5-21-2539840389-1261165778-1087677076-1000_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 1164 wrote to memory of 3804 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 1164 wrote to memory of 3804 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\cmd.exe
PID 3804 wrote to memory of 4248 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 3804 wrote to memory of 4248 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\takeown.exe
PID 3804 wrote to memory of 1480 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 3804 wrote to memory of 1480 N/A C:\Windows\System32\cmd.exe C:\Windows\system32\icacls.exe
PID 1164 wrote to memory of 4812 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 1164 wrote to memory of 4812 N/A C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe C:\Windows\System32\WormLocker2.0.exe
PID 4812 wrote to memory of 2020 N/A C:\Windows\System32\WormLocker2.0.exe C:\Windows\System32\WScript.exe
PID 4812 wrote to memory of 2020 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 0x4fc 0x47c

Network

Country Destination Domain Proto
US 8.8.8.8:53 8.8.8.8.in-addr.arpa udp
US 8.8.8.8:53 209.205.72.20.in-addr.arpa udp
US 8.8.8.8:53 130.211.222.173.in-addr.arpa udp
US 8.8.8.8:53 140.32.126.40.in-addr.arpa udp
US 8.8.8.8:53 95.221.229.192.in-addr.arpa udp
US 8.8.8.8:53 104.219.191.52.in-addr.arpa udp
US 8.8.8.8:53 28.118.140.52.in-addr.arpa udp
US 8.8.8.8:53 183.59.114.20.in-addr.arpa udp
US 8.8.8.8:53 18.31.95.13.in-addr.arpa udp
US 8.8.8.8:53 203.107.17.2.in-addr.arpa udp
US 8.8.8.8:53 21.236.111.52.in-addr.arpa udp
US 8.8.8.8:53 88.210.23.2.in-addr.arpa udp

Files

memory/1164-0-0x00007FFD5BCF3000-0x00007FFD5BCF5000-memory.dmp

memory/1164-1-0x0000000000200000-0x0000000000256000-memory.dmp

memory/1164-2-0x00007FFD5BCF0000-0x00007FFD5C7B1000-memory.dmp

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

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

memory/4812-21-0x0000000000E10000-0x0000000000E32000-memory.dmp

memory/4812-22-0x00007FFD5BCF0000-0x00007FFD5C7B1000-memory.dmp

memory/1164-23-0x00007FFD5BCF0000-0x00007FFD5C7B1000-memory.dmp

C:\Windows\System32\ransom_voice.vbs

MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615

memory/4812-95-0x00007FFD5BCF0000-0x00007FFD5C7B1000-memory.dmp

C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_D628AD38034847649BDD4F385A956504.dat

MD5 6dba1586538bd15d417a3078b44d6ca0
SHA1 eb0bfcf46523feb5dd73fd8a3de4df23e7b14e44
SHA256 483cfe805431df8dbfe6ec0298f07d4a104ae7037be2dee326b8feef3348c01e
SHA512 c4d3d5dd156ec0aa607f3da67f0b1ee18e1e3e57ee5317980ae3d4644fabe2e39c04116b06fbe37e69f01b5adb867288bceb93e0ea35713f96fb1bed1efebfa1