Overview
overview
4Static
static
4AntarctidaBuilder.exe
windows10-2004-x64
3AntarctidaBuilder.exe
windows11-ltsc_2024-x64
3costura.dll
windows10-2004-x64
1costura.dll
windows11-ltsc_2024-x64
1costura.pdb
windows10-2004-x64
3costura.pdb
windows11-ltsc_2024-x64
3dnlib.dll
windows10-2004-x64
1dnlib.dll
windows11-ltsc_2024-x64
1materialskin.dll
windows10-2004-x64
1materialskin.dll
windows11-ltsc_2024-x64
1obfuscator.dll
windows10-2004-x64
1obfuscator.dll
windows11-ltsc_2024-x64
1rjcodeadva...ls.dll
windows10-2004-x64
1rjcodeadva...ls.dll
windows11-ltsc_2024-x64
1Analysis
- max time kernel
149s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20260513-en - resource tags
arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows - submitted
09/08/2026, 17:11
Behavioral task
behavioral1
Sample
AntarctidaBuilder.exe
Resource
win10v2004-20260513-en
Behavioral task
behavioral2
Sample
AntarctidaBuilder.exe
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral3
Sample
costura.dll
Resource
win10v2004-20260513-en
Behavioral task
behavioral4
Sample
costura.dll
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral5
Sample
costura.pdb
Resource
win10v2004-20260513-en
Behavioral task
behavioral6
Sample
costura.pdb
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral7
Sample
dnlib.dll
Resource
win10v2004-20260513-en
Behavioral task
behavioral8
Sample
dnlib.dll
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral9
Sample
materialskin.dll
Resource
win10v2004-20260513-en
Behavioral task
behavioral10
Sample
materialskin.dll
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral11
Sample
obfuscator.dll
Resource
win10v2004-20260513-en
Behavioral task
behavioral12
Sample
obfuscator.dll
Resource
win11ltsc2024-20260709-en
Behavioral task
behavioral13
Sample
rjcodeadvance.rjcontrols.dll
Resource
win10v2004-20260513-en
Behavioral task
behavioral14
Sample
rjcodeadvance.rjcontrols.dll
Resource
win11ltsc2024-20260709-en
General
- Target costura.pdb
- Size 7KB
- Sample260809-vqbs9saq21
- 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 2184 cmd.exe - Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000_Classes\Local Settings cmd.exe Key created \REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000_Classes\Local Settings OpenWith.exe - Suspicious use of SetWindowsHookEx 1 IoCs
pid Process 4644 OpenWith.exe
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:2184
-
C:\Windows\system32\OpenWith.exeC:\Windows\system32\OpenWith.exe -Embedding1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4644