[coreboot] kasten.core backdoor? new weird message after each coreboot build

[Mike Banon]

Looks like there was the old hidden window of okteta hex editor that I
forgot to close, and for each rebuild of coreboot.rom okteta's core
printed these spooky messages :P Sorry for the false alarm...
(although its never wrong to be on high alert)

On Sat, Feb 10, 2018 at 10:52 PM, Mike Banon <mikebdp2 at gmail.com> wrote:
> While building a coreboot now I'm getting this "kasten.core" message
> (see below), it wasn't like that earlier! Tried to search through all
> the coreboot sources with ' find . -type f -print0 | xargs -0 grep
> "kasten" ' but no results! So thats not a new coreboot build script.
> It almost looks like instantly after I complete a coreboot build,
> something malicious modifies my coreboot.rom file. Haven't analyzed
> the .rom yet, I wanted to submit these findings as soon as possible.
> What do you think? Meanwhile I will take my system offline and remove
> a hard drive from it, so that someone couldn't remotely delete this
> backdoor before I find it
>
>     CBFS       payload_config
>     CBFS       payload_revision
>     CBFS       coreboot.rom
> kasten.core: "/home/mikeb/coreboot/build/coreboot.rom"
>     CBFSPRINT  coreboot.rom
>
> Name                           Offset     Type           Size   Comp
> cbfs master header             0x0        cbfs header        32 none
> fallback/romstage              0x80       stage          320396 none
> fallback/ramstage              0x4e480    stage          131631 none
> config                         0x6e700    raw                84 none
> revision                       0x6e7c0    raw               575 none
> cmos_layout.bin                0x6ea40    cmos_layout      1164 none
> fallback/postcar               0x6ef40    stage           13268 none
> fallback/dsdt.aml              0x72380    raw              9016 none
> fallback/payload               0x74700    payload         67370 none
> payload_config                 0x84e80    raw              1611 none
> payload_revision               0x85540    raw               239 none
> (empty)                        0x85680    null          3581720 none
> s3nv                           0x3efdc0   raw             32768 none
> (empty)                        0x3f7e00   null            31704 none
> bootblock                      0x3ffa00   bootblock         928 none
>
> Built lenovo/g505s (LENOVO G505S)
> mikeb at testing:~/coreboot$ kasten.core: "/home/mikeb/coreboot/build/coreboot.rom"