751b99f4ac429b35b5905af5803d150ae4240f931d2ff4a239d9c1f9babd791c | Triage

Analysis

max time kernel
22s
max time network
28s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
30-06-2024 18:05

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General

Target

Nexus/VST/Nexus3.4.4.dll
Size

8.5MB
MD5

3f5d64b7e6bf4d6f9cebe8a180ba3c2b
SHA1

3f7d18309274daf0a39c501c71d18c1229496721
SHA256

88961cd14b71041a5139dd58a263d00addb91b96f53db51fb57ff30bb2b46c75
SHA512

bf95fafb6f5c9330b0c3491541796710961ddb9b72a9c8458ddf2076b089c3e9a6bf24daeb348274a3109cef4aab21a1f13d95f1f66c7e3ffd2cd10c5e96701a
SSDEEP

196608:De3Bhdgk7cBITaNXhmJGIMYga5EoiKEyQB6/jeXXl+raZgUt:DeXd1cI6XhmJWYgatTEyGXo

Score

7^/10

bootkit persistence

Malware Config

Signatures

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

Processes:

rundll32.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	rundll32.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	rundll32.exe

Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs
Bootkits write to the MBR to gain persistence at a level below the operating system.
bootkit persistence

Bootkit
T1542.003

Processes:

rundll32.exe

description ioc process

File opened for modification \??\PhysicalDrive0 rundll32.exe

C:\Windows\system32\rundll32.exe
rundll32.exe C:\Users\Admin\AppData\Local\Temp\Nexus\VST\Nexus3.4.4.dll,#1
1⤵
- Checks BIOS information in registry
- Writes to the Master Boot Record (MBR)
PID:5004

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

memory/5004-0-0x00007FF8937B0000-0x00007FF894CB1000-memory.dmp

Filesize
21.0MB

Download
memory/5004-2-0x00000267E57E0000-0x00000267E57EC000-memory.dmp

Filesize
48KB

Download
memory/5004-3-0x00007FF8937B0000-0x00007FF894CB1000-memory.dmp

Filesize
21.0MB

Download