d4c83205cf6f3098ab6a757312525f4d14a57a819306eeea5c0d022b00b38cf3

Analysis

max time kernel
120s
max time network
118s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
24/03/2024, 12:34

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General

Target
Automatic_converter_rff_to_mp4.exe
Size 322KB
Sample240324-pr5j3scg55
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
2532	takeown.exe
4648	icacls.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	Automatic_converter_rff_to_mp4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000\Control Panel\International\Geo\Nation	WormLocker2.0.exe

Executes dropped EXE 1 IoCs

pid	Process
4360	WormLocker2.0.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2532	takeown.exe
4648	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

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-983155329-280873152-1838004294-1000_Classes\Local Settings	WormLocker2.0.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4360	WormLocker2.0.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	2532	takeown.exe
Token: SeDebugPrivilege	4360	WormLocker2.0.exe
Token: 33	3176	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	3176	AUDIODG.EXE

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4108 wrote to memory of 1460	4108	Automatic_converter_rff_to_mp4.exe	88
PID 4108 wrote to memory of 1460	4108	Automatic_converter_rff_to_mp4.exe	88
PID 1460 wrote to memory of 2532	1460	cmd.exe	90
PID 1460 wrote to memory of 2532	1460	cmd.exe	90
PID 1460 wrote to memory of 4648	1460	cmd.exe	91
PID 1460 wrote to memory of 4648	1460	cmd.exe	91
PID 4108 wrote to memory of 4360	4108	Automatic_converter_rff_to_mp4.exe	95
PID 4108 wrote to memory of 4360	4108	Automatic_converter_rff_to_mp4.exe	95
PID 4360 wrote to memory of 4524	4360	WormLocker2.0.exe	101
PID 4360 wrote to memory of 4524	4360	WormLocker2.0.exe	101

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⤵
- Checks computer location settings
- Drops file in System32 directory
- Suspicious use of WriteProcessMemory
PID:4108
- 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:1460
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:2532
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\System32 /grant "Admin:F"
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:4648
- C:\Windows\System32\WormLocker2.0.exe
  "C:\Windows\System32\WormLocker2.0.exe"
  2⤵
  - Modifies WinLogon for persistence
  - Checks computer location settings
  - Executes dropped EXE
  - Modifies registry class
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4360
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Windows\System32\ransom_voice.vbs"
    3⤵
    PID:4524

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x300 0x3a4
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:3176

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

SP_3DE24D8049844A449C8BC99CF25BAC8B.dat

Path C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_3DE24D8049844A449C8BC99CF25BAC8B.dat
Size 940B
SHA256 27d49d49093bca1416452ba905ac24d9a657246d78fb3b5fba9f3d91a80c532f
MD5 d2fa9562329f097d93ee013ddfd1bb36
SHA1 7a47fb5c61879b5e855402ac722dd80ae716cd50
SHA512 fd3f56a6b1f0c469034c0502986ceed5db07173d80dc88260ec789d99ebd74a84d4bee28c9f6452feb3c000dbb4bf4ffdca146eed5bf971f065db0c64eef41ff
MD5 SHA1 SHA512

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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/4108-0-0x0000000000010000-0x0000000000066000-memory.dmp

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memory/4108-1-0x00007FFEF2680000-0x00007FFEF3141000-memory.dmp

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memory/4108-2-0x000000001AE00000-0x000000001AE10000-memory.dmp

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memory/4108-23-0x00007FFEF2680000-0x00007FFEF3141000-memory.dmp

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memory/4360-27-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-24-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-28-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-29-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-21-0x0000000000680000-0x00000000006A2000-memory.dmp

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memory/4360-93-0x00007FFEF2680000-0x00007FFEF3141000-memory.dmp

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memory/4360-94-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-95-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-96-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-97-0x000000001B200000-0x000000001B210000-memory.dmp

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memory/4360-22-0x00007FFEF2680000-0x00007FFEF3141000-memory.dmp

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