7e190e48165cf7c72173ce84e0f0b164fbe794d3e45069408055ba7496da1497

General

Target
Automatic_converter_rff_to_mp4.exe
Size 322KB
Sample240701-gl3jja1dkp
SHA256 d4c83205cf6f3098ab6a757312525f4d14a57a819306eeea5c0d022b00b38cf3
MD5 1b4f89bdb12a349de92ca7f1261e67a0
SHA1 f368916850332757d7ed2f0ee335c16b9c9fc95b
SHA512 f2f7985fbf462bc35e099b58308ddef91320d3d81040f77e7c1c0a3cfc3a4da50c849efd0f063c839848a80927398cc24bc8368d5b0b92014abe2ea7bdc2ddeb
SSDEEP 6144:iibVlHNEHBpDDf2vfQ21NV0zUiCqWjH6YPON9q:igtCpPfGfZSWPf
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

discovery evasion exploit persistence

Malware Config

Signatures

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "empty"	WormLocker2.0.exe

Disables Task Manager via registry modification
evasion

Possible privilege escalation attempt 2 IoCs

exploit

pid	Process
3028	takeown.exe
2584	icacls.exe

Executes dropped EXE 1 IoCs

pid	Process
2572	WormLocker2.0.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
3028	takeown.exe
2584	icacls.exe

Drops file in System32 directory 6 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\WormLocker2.0.exe	Automatic_converter_rff_to_mp4.exe
File created	C:\Windows\System32\LogonUItrue.exe	Automatic_converter_rff_to_mp4.exe
File opened for modification	C:\Windows\System32\LogonUItrue.exe	Automatic_converter_rff_to_mp4.exe
File created	C:\Windows\System32\LogonUI.exe	Automatic_converter_rff_to_mp4.exe
File opened for modification	C:\Windows\System32\LogonUIinf.exe	Automatic_converter_rff_to_mp4.exe
File opened for modification	C:\Windows\System32\ransom_voice.vbs	Automatic_converter_rff_to_mp4.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2572	WormLocker2.0.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	3028	takeown.exe
Token: SeDebugPrivilege	2572	WormLocker2.0.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1732 wrote to memory of 3032	1732	Automatic_converter_rff_to_mp4.exe	28
PID 1732 wrote to memory of 3032	1732	Automatic_converter_rff_to_mp4.exe	28
PID 1732 wrote to memory of 3032	1732	Automatic_converter_rff_to_mp4.exe	28
PID 3032 wrote to memory of 3028	3032	cmd.exe	30
PID 3032 wrote to memory of 3028	3032	cmd.exe	30
PID 3032 wrote to memory of 3028	3032	cmd.exe	30
PID 3032 wrote to memory of 2584	3032	cmd.exe	31
PID 3032 wrote to memory of 2584	3032	cmd.exe	31
PID 3032 wrote to memory of 2584	3032	cmd.exe	31
PID 1732 wrote to memory of 2572	1732	Automatic_converter_rff_to_mp4.exe	32
PID 1732 wrote to memory of 2572	1732	Automatic_converter_rff_to_mp4.exe	32
PID 1732 wrote to memory of 2572	1732	Automatic_converter_rff_to_mp4.exe	32
PID 2572 wrote to memory of 1192	2572	WormLocker2.0.exe	34
PID 2572 wrote to memory of 1192	2572	WormLocker2.0.exe	34
PID 2572 wrote to memory of 1192	2572	WormLocker2.0.exe	34

C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe
"C:\Users\Admin\AppData\Local\Temp\Automatic_converter_rff_to_mp4.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:1732
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /k takeown /f C:\Windows\System32 && icacls C:\Windows\System32 /grant "%username%:F"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3032
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:3028
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\System32 /grant "Admin:F"
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:2584
- C:\Windows\System32\WormLocker2.0.exe
  "C:\Windows\System32\WormLocker2.0.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2572
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Windows\System32\ransom_voice.vbs"
    3⤵
    PID:1192

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{3F6B5E16-092A-41ED-930B-0B4125D91D4E}
1⤵
PID:2044

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Defense Evasion

File and Directory Permissions Modification

Modify Registry

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

WormLocker2.0.exe

Path C:\Windows\System32\WormLocker2.0.exe
Size 116KB
SHA256 830c271c8aca775457a090a51c93ad08f9665361eeeaa3fda3f9ae032202ad73
MD5 041aa5e99ae545dac5f9306bb20d869e
SHA1 88ea126645bfd418abba44cca4a16adf12084d2f
SHA512 4b8007dddd519c77bb596f6d17f270da62b236894b6fd7f1c528e553b1aac3a7f9c0df4bb40b678461f70bde3c5a8ac4b5e97e5372dd127a8184862c7f6f4c7c
SSDEEP 3072:bDbhChcu7cIA5SvNdQGuI7hNVLokwLQLO3s/qY:bDf2vfQ21NV0zUiCq
MD5 SHA1 SHA512 SSDEEP

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ransom_voice.vbs

Path C:\Windows\System32\ransom_voice.vbs
Size 397B
SHA256 d200a1e942b8cfdcd8190d1ad59f92e27e39b919ba230f2dd88d70c3df428c7b
MD5 c1f9613622f740c2f00c2fa8881ba7ba
SHA1 bf3271720634bebb3c41ef2b33af525b62f931bc
SHA512 49e00bb3c76f7e69818a889f045f3d3c43badf2116facccbbf69c61de19f91a42aee891b9a5b72a256453e2fc5c637adac1e354cf88e6782679afa886ad1c615
MD5 SHA1 SHA512

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memory/1732-0-0x000007FEF60C3000-0x000007FEF60C4000-memory.dmp

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memory/1732-1-0x0000000000C80000-0x0000000000CD6000-memory.dmp

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memory/1732-2-0x000007FEF60C0000-0x000007FEF6AAC000-memory.dmp

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memory/1732-14-0x000007FEF60C0000-0x000007FEF6AAC000-memory.dmp

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memory/2572-13-0x0000000001260000-0x0000000001282000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads