4 ms·

Huh so new antimalware tactic: Buy passively cooled PC :) And also set up a Russian keyboard: https://krebsonsecurity.com/2021/05/try-this-one-weird-trick-russ

Huh so new antimalware tactic: Buy passively cooled PC :) And also set up a Russian keyboard: https://krebsonsecurity.com/2021/05/try-this-one-weird-trick-russian-hackers-hate/ https://krebsonsecurity.com/2021/05/try-this-one-weird-trick...

dale_glass 1y ago
Passively cooled PC probably won't work because the board will still have fan headers even if nothing is connected to them.
- dom96 1y ago
  So we just need to implement the opposite of what OP has on our PCs, i.e. make OS think there are no fans.
  - wkat4242 1y ago
    Yes and another method of controlling them.
    - syntaxfree 1y ago
      External cooling device?
      - theodric 1y ago
        The computer knows there's a fan because it sees tacho output. If it doesn't see tacho, shrug. You can get an external temperature-controlled PWM controller for a few units of your local currency on AliExpress, steal 12V from somewhere (Molex header or whatever) and run the fans off that. Figure out where to put the temp sensor to get the desired effect. There are far better ways to do this, but they require software engineering, not €3 and 15 minutes.
        mananaysiempre 1y ago
        The problem is not the fan, it’s the fan controller on the motherboard. I doubt a nonfancy fan controller will bother to drop off the bus/whatever if it doesn’t have fans connected, and the comment by 'patrakov upthread seems to confirm this.
        KokomoIsALie 1y ago
        The computer knows there is a fan because it knows when there isn't a fan. By subtracting where there is a fan from where there isn't a fan, or where there isn't from where there is (whichever is greater) it obtains a difference, or deviation...
        bryant 1y ago
        Ugh, and unfortunately, this meme makes perfect sense in this context.
        TeMPOraL 1y ago
        This meme makes perfect sense in almost all contexts - at least continuous ranges are involved. I salute GP for fitting it for use with a discrete case.
        lukan 1y ago
        "because it knows when there isn't a fan" How does the computer knows that? You mean the parts that can meassure temperature will meassure where it gets warmer, or where it doesn't get warmer, altough it should? How does the system knows, it is not a local heat pipe, transferring heat away?
        junon 1y ago
        (the comment you're replying to is a meme - https://knowyourmeme.com/memes/the-missile-knows-where-it-is https://knowyourmeme.com/memes/the-missile-knows-where-it-is)
  - Gormo 1y ago
    Board vendors ought to start including a BIOS option to hide fans from DMI.
patrakov 1y ago
Writing this from a passively cooled (Streacom FC8 Evo) Linux PC with a Russian keyboard. # dmidecode 3.6 Getting SMBIOS data from sysfs. SMBIOS 2.8 present. Handle 0x002C, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0029 Type: <OUT OF SPEC> Status: <OUT OF SPEC> Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Cooling Dev 1 Handle 0x002F, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0029 Type: <OUT OF SPEC> Status: <OUT OF SPEC> Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Not Specified Handle 0x0037, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0036 Type: Power Supply Fan Status: OK Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Cooling Dev 1 So a cooling device is still present. Sensor data: iwlwifi_1-virtual-0 Adapter: Virtual device temp1: +59.0°C acpitz-acpi-0 # Fake, always reports these temperatures Adapter: ACPI interface temp1: +27.8°C temp2: +29.8°C coretemp-isa-0000 Adapter: ISA adapter Package id 0: +51.0°C (high = +86.0°C, crit = +92.0°C) Core 0: +51.0°C (high = +86.0°C, crit = +92.0°C) Core 1: +47.0°C (high = +86.0°C, crit = +92.0°C) Core 2: +49.0°C (high = +86.0°C, crit = +92.0°C) Core 3: +49.0°C (high = +86.0°C, crit = +92.0°C)
- irusensei 1y ago
  > Streacom FC8 Evo I normally think PC cases are gaudy and boring even when trying to evoke some style. That stuff in Streacom website however makes me want to build something with it.
  - jdmichal 1y ago
    LTT did a video with the SG10 a couple months ago. Really neat concept. https://www.youtube.com/watch?v=iLHC2_gByQ8 https://www.youtube.com/watch?v=iLHC2_gByQ8
  - ansgri 1y ago

dale_glass 1y ago

Passively cooled PC probably won't work because the board will still have fan headers even if nothing is connected to them.

dom96 1y ago
So we just need to implement the opposite of what OP has on our PCs, i.e. make OS think there are no fans.
- wkat4242 1y ago
  Yes and another method of controlling them.
  - syntaxfree 1y ago
    External cooling device?
    - theodric 1y ago
      The computer knows there's a fan because it sees tacho output. If it doesn't see tacho, shrug. You can get an external temperature-controlled PWM controller for a few units of your local currency on AliExpress, steal 12V from somewhere (Molex header or whatever) and run the fans off that. Figure out where to put the temp sensor to get the desired effect. There are far better ways to do this, but they require software engineering, not €3 and 15 minutes.
      - mananaysiempre 1y ago
        The problem is not the fan, it’s the fan controller on the motherboard. I doubt a nonfancy fan controller will bother to drop off the bus/whatever if it doesn’t have fans connected, and the comment by 'patrakov upthread seems to confirm this.
      - KokomoIsALie 1y ago
        The computer knows there is a fan because it knows when there isn't a fan. By subtracting where there is a fan from where there isn't a fan, or where there isn't from where there is (whichever is greater) it obtains a difference, or deviation...
        bryant 1y ago
        Ugh, and unfortunately, this meme makes perfect sense in this context.
        TeMPOraL 1y ago
        This meme makes perfect sense in almost all contexts - at least continuous ranges are involved. I salute GP for fitting it for use with a discrete case.
        lukan 1y ago
        "because it knows when there isn't a fan" How does the computer knows that? You mean the parts that can meassure temperature will meassure where it gets warmer, or where it doesn't get warmer, altough it should? How does the system knows, it is not a local heat pipe, transferring heat away?
        junon 1y ago
        (the comment you're replying to is a meme - https://knowyourmeme.com/memes/the-missile-knows-where-it-is https://knowyourmeme.com/memes/the-missile-knows-where-it-is)
- Gormo 1y ago
  Board vendors ought to start including a BIOS option to hide fans from DMI.

patrakov 1y ago

Writing this from a passively cooled (Streacom FC8 Evo) Linux PC with a Russian keyboard. # dmidecode 3.6 Getting SMBIOS data from sysfs. SMBIOS 2.8 present. Handle 0x002C, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0029 Type: <OUT OF SPEC> Status: <OUT OF SPEC> Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Cooling Dev 1 Handle 0x002F, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0029 Type: <OUT OF SPEC> Status: <OUT OF SPEC> Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Not Specified Handle 0x0037, DMI type 27, 15 bytes Cooling Device Temperature Probe Handle: 0x0036 Type: Power Supply Fan Status: OK Cooling Unit Group: 1 OEM-specific Information: 0x00000000 Nominal Speed: Unknown Or Non-rotating Description: Cooling Dev 1 So a cooling device is still present. Sensor data: iwlwifi_1-virtual-0 Adapter: Virtual device temp1: +59.0°C acpitz-acpi-0 # Fake, always reports these temperatures Adapter: ACPI interface temp1: +27.8°C temp2: +29.8°C coretemp-isa-0000 Adapter: ISA adapter Package id 0: +51.0°C (high = +86.0°C, crit = +92.0°C) Core 0: +51.0°C (high = +86.0°C, crit = +92.0°C) Core 1: +47.0°C (high = +86.0°C, crit = +92.0°C) Core 2: +49.0°C (high = +86.0°C, crit = +92.0°C) Core 3: +49.0°C (high = +86.0°C, crit = +92.0°C)

irusensei 1y ago
> Streacom FC8 Evo I normally think PC cases are gaudy and boring even when trying to evoke some style. That stuff in Streacom website however makes me want to build something with it.
- jdmichal 1y ago
  LTT did a video with the SG10 a couple months ago. Really neat concept. https://www.youtube.com/watch?v=iLHC2_gByQ8 https://www.youtube.com/watch?v=iLHC2_gByQ8
- ansgri 1y ago