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

[Mike Banon]

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"