7e190e48165cf7c72173ce84e0f0b164fbe794d3e45069408055ba7496da1497

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
01/07/2024, 06:03

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General

Target
Automatic_converter_rff_to_mp4.exe
Size 322KB
Sample240701-gseq2s1ejn
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
2304	takeown.exe
4228	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-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	Automatic_converter_rff_to_mp4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2804150937-2146708401-419095071-1000\Control Panel\International\Geo\Nation	WormLocker2.0.exe

Executes dropped EXE 1 IoCs

pid	Process
1540	WormLocker2.0.exe

Modifies file permissions 1 TTPs 2 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2304	takeown.exe
4228	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-1-5-21-2804150937-2146708401-419095071-1000_Classes\Local Settings	WormLocker2.0.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1540	WormLocker2.0.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeTakeOwnershipPrivilege	2304	takeown.exe
Token: SeDebugPrivilege	1540	WormLocker2.0.exe
Token: 33	1188	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1188	AUDIODG.EXE

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 2720	4528	Automatic_converter_rff_to_mp4.exe	81
PID 4528 wrote to memory of 2720	4528	Automatic_converter_rff_to_mp4.exe	81
PID 2720 wrote to memory of 2304	2720	cmd.exe	83
PID 2720 wrote to memory of 2304	2720	cmd.exe	83
PID 2720 wrote to memory of 4228	2720	cmd.exe	84
PID 2720 wrote to memory of 4228	2720	cmd.exe	84
PID 4528 wrote to memory of 1540	4528	Automatic_converter_rff_to_mp4.exe	89
PID 4528 wrote to memory of 1540	4528	Automatic_converter_rff_to_mp4.exe	89
PID 1540 wrote to memory of 4484	1540	WormLocker2.0.exe	94
PID 1540 wrote to memory of 4484	1540	WormLocker2.0.exe	94

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:4528
- 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:2720
- - C:\Windows\system32\takeown.exe
    takeown /f C:\Windows\System32
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    - Suspicious use of AdjustPrivilegeToken
    PID:2304
- - C:\Windows\system32\icacls.exe
    icacls C:\Windows\System32 /grant "Admin:F"
    3⤵
    - Possible privilege escalation attempt
    - Modifies file permissions
    PID:4228
- 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:1540
- - C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Windows\System32\ransom_voice.vbs"
    3⤵
    PID:4484

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x3f0 0x528
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1188

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_05C46ECA458C43CF9D8A3985DAC7D582.dat

Path C:\Users\Admin\AppData\Roaming\Microsoft\Speech\Files\UserLexicons\SP_05C46ECA458C43CF9D8A3985DAC7D582.dat
Size 940B
SHA256 d1d7f95546fac981ad0c4b3c54d6d6a333eedeb2b036941f2506f521bbfa1fd6
MD5 47aa12ad798f1d8ceaa6a6aa5cfeae50
SHA1 2294b41df32dd91bab588d11318a461a6097f742
SHA512 6d14bea39a164b98f723d792e2ad63b8d9faea25bcfe112708ef8a064f3765687f5c9cb8281d62132cda09613e6f7b0f00e7887a01d83eb6975a24ea187a01da
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/1540-21-0x0000000000890000-0x00000000008B2000-memory.dmp

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memory/1540-23-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

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memory/1540-100-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

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memory/4528-1-0x0000000000AC0000-0x0000000000B16000-memory.dmp

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memory/4528-0-0x00007FFCBF2A3000-0x00007FFCBF2A5000-memory.dmp

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memory/4528-2-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

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memory/4528-22-0x00007FFCBF2A0000-0x00007FFCBFD61000-memory.dmp

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