Analysis
- max time kernel
150s - max time network
149s - platform
windows10_x64 - resource
win10v20210410 - submitted
21/04/2021, 21:37
General
- Target 17e73f5c5a7ffa3797a0bdc1816d347b.exe
- Size 116KB
- Sample210421-c4kw8a69f6
- SHA256 c3cad420d5e8e63d11b2b00d198db8cdf12018ab7080f870b21e29f89a897868
Malware Config
Extracted
-
blacknet
-
v3.7.0 Public
-
94qF3s
-
http://www.rtmmodz.a2hosted.com/
-
BN[dbdb82ae7c8fe0]
-
antivm
false
-
elevate_uac
false
-
install_name
WindowsUpdate.exe
-
splitter
|BN|
-
start_name
e162b1333458a713bc6916cc8ac4110c
-
startup
false
-
usb_spread
false
Signatures
- BlackNET
BlackNET is an open source remote access tool written in VB.NET.
- BlackNET Payload 2 IoCs
- Contains code to disable Windows Defender 2 IoCs
A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Suspicious behavior: EnumeratesProcesses 32 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of SetWindowsHookEx 4 IoCs
- Suspicious use of WriteProcessMemory 2 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\17e73f5c5a7ffa3797a0bdc1816d347b.exe"C:\Users\Admin\AppData\Local\Temp\17e73f5c5a7ffa3797a0bdc1816d347b.exe"1⤵
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe"C:\Users\Admin\AppData\Local\Temp\Microsoft\MyClient\WindowsUpdate.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/3676-125-0x000000001B0F0000-0x000000001B0F2000-memory.dmp
memory/3676-126-0x000000001B0F3000-0x000000001B0F4000-memory.dmp
memory/3676-127-0x000000001B0F2000-0x000000001B0F3000-memory.dmp
memory/3676-128-0x000000001B0F5000-0x000000001B0F7000-memory.dmp
memory/3916-114-0x0000000000C70000-0x0000000000C71000-memory.dmp
memory/3916-116-0x0000000001510000-0x0000000001512000-memory.dmp
memory/3916-117-0x0000000001513000-0x0000000001514000-memory.dmp
memory/3916-118-0x0000000001512000-0x0000000001513000-memory.dmp
memory/3916-124-0x0000000001515000-0x0000000001517000-memory.dmp