Learn English – Equivalent of above and below for the words right and left

An alternative reading would say that the editor missed a required comma:

While a malware coder could write code to disable protection in this way, though[,] it would be a complex task.

The use of "though" in that fashion is equivalent to "however", so the sentence could be re-written as

However, while a malware coder could write code to disable protection in this way, it would be a complex task.

(Which means that code-based protection disablement is possible, but it's probably not worth the effort.)

But as @Johnathan Garber points out in a comment, there was already a sentence starting with "However" very close to this one; so the author probably wanted to avoid the repetition. Thus he went with the alternative structure, and then the comma somehow got dropped.

In your first example, you would just use above, as an adverb is all that is needed. But it really only describes what is directly above.

In your second example, from above is not helpful because it is not specific as to what you are referring to. You should point to the specific location.

When using from above, from is a preposition, so I expect an object in that phrase. For example:

From above the trees, I could see the distant horizon.

The locations are specific. Also motion is often involved:

The birds flew from above the trees to the roof of our house.

There are some idiomatic usages though, for example:

Their new baby was a gift from above. (meaning from heaven)