Overview
overview
4Static
static
46a4b9d67c109e.exe
windows10-2004-x64
36a4b9d67c109e.exe
windows11-ltsc_2024-x64
4costura.dll
windows10-2004-x64
1costura.dll
windows11-ltsc_2024-x64
1costura.pdb
windows10-2004-x64
3costura.pdb
windows11-ltsc_2024-x64
3guna.ui2.dll
windows10-2004-x64
1guna.ui2.dll
windows11-ltsc_2024-x64
1Analysis
- user interaction
yes - max time kernel
149s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
03/08/2026, 16:14
Behavioral task
behavioral1
Sample
6a4b9d67c109e.exe
Resource
win10v2004-20260513-en
windows10-2004-x64
10 signatures
150 seconds
Behavioral task
behavioral2
Sample
6a4b9d67c109e.exe
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
11 signatures
150 seconds
Behavioral task
behavioral3
Sample
costura.dll
Resource
win10v2004-20260513-en
windows10-2004-x64
0 signatures
150 seconds
Behavioral task
behavioral4
Sample
costura.dll
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
0 signatures
150 seconds
Behavioral task
behavioral5
Sample
costura.pdb
Resource
win10v2004-20260513-en
windows10-2004-x64
9 signatures
150 seconds
Behavioral task
behavioral6
Sample
costura.pdb
Resource
win11ltsc2024-20260709-en
windows11-ltsc_2024-x64
4 signatures
150 seconds
Behavioral task
behavioral7
Sample
guna.ui2.dll
Resource
win10v2004-20260513-en
windows10-2004-x64
0 signatures
150 seconds
Behavioral task
behavioral8
Sample
guna.ui2.dll
Resource
win11ltsc2024-20260710-en
windows11-ltsc_2024-x64
0 signatures
150 seconds
General
- Target costura.pdb
- Size 7KB
- Sample260803-tpryesca42
- SHA256 fbb47bfd057253e9461bc7fe661eb8ad273451782f3e227b8db8f88b54cea186
- MD5 dd3394a0ba6f7158d029e1c3a31b7a85
- SHA1 806f4c19b2d7fd9e3b836269ec07647019a29e95
- SHA512 2fbedae58d16bfe20954094e5c7541e1b25310107571e94f7bea35b2217aa634197ef147afb9ffbd9c59aa0f7e209cf2a97349c3503077758502bf7a776e2575
- SSDEEP 192:yMD/wix+PI6jMai+NLy5nj4SCBg5MRkCIFQkC8g7AHOuXk/N/8Hu04:y8YPI6jMai+NLy5nj4SCm5Mz6QkOAHO/
- TLSH T1A4F1B33F5748C463C89959720521C49CB6B343202670ED78F3DB2608EDAF69AC7B5772
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Signatures
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Executes a command shell one-liner 1 TTPs 1 IoCs
Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.
pid Process 4540 cmd.exe - System Location Discovery: System Language Discovery 1 TTPs 1 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language IEXPLORE.EXE - Modifies Internet Explorer Phishing Filter 1 TTPs 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\PhishingFilter iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\PhishingFilter\ClientSupported_MigrationTime = 54337c7775e3dc01 iexplore.exe -
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\Main iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Main\CompatibilityFlags = "0" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\Main\WindowsSearch iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\Main IEXPLORE.EXE Set value (int) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\PendingRecovery\AdminActive = "0" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\MINIE iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\MINIE\TabBandWidth = "677" iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\Recovery\AdminActive iexplore.exe Set value (int) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Recovery\AdminActive\{8154EC4E-8F56-11F1-B03F-5AB93EA64185} = "0" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Main\WindowsSearch\Version = "WS not running" iexplore.exe Set value (str) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Main\FullScreen = "no" iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Main\Window_Placement = 2c0000000200000003000000ffffffffffffffffffffffffffffffff2400000024000000aa04000089020000 iexplore.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\Software\Microsoft\Internet Explorer\Recovery\PendingRecovery iexplore.exe Set value (data) \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000\SOFTWARE\Microsoft\Internet Explorer\Main\DownloadWindowPlacement = 2c0000000000000000000000ffffffffffffffffffffffffffffffff50020000f0000000d0040000d0020000 iexplore.exe - Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000_Classes\Local Settings OpenWith.exe Key created \REGISTRY\USER\S-1-5-21-2937465464-4167303362-2236413517-1000_Classes\Local Settings cmd.exe - Suspicious use of FindShellTrayWindow 2 IoCs
pid Process 3344 iexplore.exe 3344 iexplore.exe - Suspicious use of SetWindowsHookEx 29 IoCs
pid Process 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3336 OpenWith.exe 3344 iexplore.exe 3344 iexplore.exe 2212 IEXPLORE.EXE 2212 IEXPLORE.EXE - Suspicious use of WriteProcessMemory 2 IoCs
description pid Process procid_target PID 3336 wrote to memory of 3344 3336 OpenWith.exe 94 PID 3344 wrote to memory of 2212 3344 iexplore.exe 96
Processes
-
C:\Windows\system32\cmd.execmd /c C:\Users\Admin\AppData\Local\Temp\costura.pdb1⤵
- Executes a command shell one-liner
- Modifies registry class
PID:4540
-
C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3336 -
C:\Program Files\Internet Explorer\iexplore.exe"C:\Program Files\Internet Explorer\iexplore.exe" C:\Users\Admin\AppData\Local\Temp\costura.pdb2⤵
- Modifies Internet Explorer Phishing Filter
- Modifies Internet Explorer settings
- Suspicious use of FindShellTrayWindow
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3344 -
C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE"C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:3344 CREDAT:17410 /prefetch:23⤵
- System Location Discovery: System Language Discovery
- Modifies Internet Explorer settings
- Suspicious use of SetWindowsHookEx
PID:2212
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