b9cdc60586f0ba16468d7a4a62a30d4c745d283919ecc94b7a08eaa560def688

Analysis

max time kernel
1702s
max time network
1676s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
02-08-2024 16:33

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General

Target

include/ctype.h
Size

9KB
MD5

22e5a00491e32d15b40b196397ad01c1
SHA1

b0db6fcbf4abd2f4fdea2771399c1e502d9f8106
SHA256

4cfaaa43b3f7414984126e8b1cdf65f9dac0ef68d9a3396be0b8828376a74a6b
SHA512

28839104776441738233334a20de6ce3ada51179fb50366c27ab60432949fc78e1ccf735d2e80216f8779d84328634005c322d0010875e8fe0ff33d699ecc114
SSDEEP

192:aK0sBzLLoy8q3JHZDrs+UAt0g7WnBeaIlzjD:EALLb8ars+Flzf

Score

5^/10

Malware Config

Signatures

Drops file in System32 directory 2 IoCs

Processes:

NOTEPAD.EXE

description ioc process

File created C:\Windows\System32\ctype.h NOTEPAD.EXE
File opened for modification C:\Windows\System32\ctype.h NOTEPAD.EXE
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

description	ioc	process
File created	C:\Windows\System32\ctype.h	NOTEPAD.EXE
File opened for modification	C:\Windows\System32\ctype.h	NOTEPAD.EXE

Modifies registry class 41 IoCs

Processes:

NOTEPAD.EXEOpenWith.execmd.exe

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\FFlags = "1"	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\Mode = "4"	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\MRUListEx = 00000000ffffffff	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags	NOTEPAD.EXE
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\GroupView = "0"	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\MRUListEx = 00000000ffffffff	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0 = 560031000000000002598d66100057696e646f777300400009000400efbe874f77480259ca852e000000000600000000010000000000000000000000000000001eb00d01570069006e0064006f0077007300000016000000	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0\MRUListEx = 00000000ffffffff	NOTEPAD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\GroupByKey:FMTID = "{00000000-0000-0000-0000-000000000000}"	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 02	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\FFlags = "1092616257"	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\Sort = 000000000000000000000000000000000100000030f125b7ef471a10a5f102608c9eebac0a00000001000000	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\GroupByKey:PID = "0"	NOTEPAD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\Shell\SniffedFolderType = "Generic"	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\Shell	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0\0	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0 = 19002f433a5c000000000000000000000000000000000000000000	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0\0 = 5a003100000000000259ca85100053797374656d33320000420009000400efbe874f77480259ca852e000000b90c00000000010000000000000000000000000000000be76400530079007300740065006d0033003200000018000000	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0\0\NodeSlot = "2"	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1\0\0\0\MRUListEx = ffffffff	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\IconSize = "16"	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	OpenWith.exe
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 00000000ffffffff	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\1 = 14001f50e04fd020ea3a6910a2d808002b30309d0000	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\MRUListEx = 0100000000000000ffffffff	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\BagMRU\NodeSlots = 0202	NOTEPAD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\LogicalViewMode = "1"	NOTEPAD.EXE
Set value (data)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\ColInfo = 00000000000000000000000000000000fddfdffd100000000000000000000000040000001800000030f125b7ef471a10a5f102608c9eebac0a0000001001000030f125b7ef471a10a5f102608c9eebac0e0000009000000030f125b7ef471a10a5f102608c9eebac040000007800000030f125b7ef471a10a5f102608c9eebac0c00000050000000	NOTEPAD.EXE
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings	cmd.exe
Set value (int)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000_Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags\2\ComDlg\{5C4F28B5-F869-4E84-8E60-F11DB97C5CC7}\GroupByDirection = "1"	NOTEPAD.EXE

Opens file in notepad (likely ransom note) 1 IoCs
ransomware

Processes:

NOTEPAD.EXE

pid process

3640 NOTEPAD.EXE
Suspicious behavior: GetForegroundWindowSpam 2 IoCs

Processes:

OpenWith.exeNOTEPAD.EXE

pid process

1100 OpenWith.exe
3640 NOTEPAD.EXE
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

NOTEPAD.EXE

pid process

3640 NOTEPAD.EXE

pid	process
3640	NOTEPAD.EXE

pid	process
3640	NOTEPAD.EXE

Suspicious use of SetWindowsHookEx 19 IoCs

Processes:

OpenWith.exeNOTEPAD.EXE

pid	process
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
1100	OpenWith.exe
3640	NOTEPAD.EXE
3640	NOTEPAD.EXE

Suspicious use of WriteProcessMemory 2 IoCs

Processes:

OpenWith.exe

description	pid	process	target process
PID 1100 wrote to memory of 3640	1100	OpenWith.exe	NOTEPAD.EXE
PID 1100 wrote to memory of 3640	1100	OpenWith.exe	NOTEPAD.EXE

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\include\ctype.h
1⤵
- Modifies registry class
PID:2952

C:\Windows\system32\OpenWith.exe
C:\Windows\system32\OpenWith.exe -Embedding
1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1100

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\include\ctype.h
2⤵
- Drops file in System32 directory
- Modifies registry class
- Opens file in notepad (likely ransom note)
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
PID:3640

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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