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Thoughts on this AppImage behavior?

Hi everyone, so i've seen an app image that had code like this if [ ! -z "$APPIMAGE" ] && [ ! -z "$APPDIR" ]; then MD5=$(echo -n "file://$APPIMAGE" | md5sum | cut -d' ' -f1) cp "$APPDIR/{{iconFilename}}"…

Linux Tipps & Hardening reddit.com 19.11.2024, 19:33 Uhr 2 Min. Lesezeit

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Hi everyone, so i've seen an app image that had code like this

if [ ! -z "$APPIMAGE" ] && [ ! -z "$APPDIR" ]; then MD5=$(echo -n "file://$APPIMAGE" | md5sum | cut -d' ' -f1) cp "$APPDIR/{{iconFilename}}" "$HOME/.cache/thumbnails/normal/$MD5.png" >/dev/null 2>&1 cp "$APPDIR/{{iconFilename}}" "$HOME/.cache/thumbnails/large/$MD5.png" >/dev/null 2>&1 xdg-icon-resource forceupdate >/dev/null 2>&1 fi

Inside the `AppRun` basically the script that will start the application bundled in the appimage, the idea was that to put the icon of the app into the thumbnail cache so it displays an icon in the file manager.

I find this wrong because it should be left to the file manager, for example KDE Plasma's Dolphin seems to already thumbnail appimages, gnome's file manager does not but perhaps there are plugins that could do that.

Therefore I find this pretty hacky and would prefer to leave it up to the user's setup instead of forcing a thumbnail in as you start the app.

The owner however states that this is not an issue and is safe and so I wanted to hear from the wider Linux community what your opinions are on it, and if you can come up with more constructive arguments either for or against such a behavior and what if more appimages followed this path.

submitted by /u/ravenravener
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Syntax validiert (0 Fehler)

title: Detect Exploitation - Thoughts on this AppImage behavior?
id: 571d05e4-4e27-42f7-99c0-0d4ede13f070
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
  - https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
  category: network_connection
  product: any
detection:
  selection:
      CommandLine|contains:
        - 'exploit'
  condition: selection
falsepositives:
  - Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
  - attack.initial_access

Syntax validiert (0 Fehler)

rule CTI_Threat_Indicator {
    meta:
        author = "iShareStuff CTI Automated Detection Engine"
        date = "2026-09-25"
        description = "YARA Signature for "
    strings:
        $str = "Thoughts on this AppImage beha" ascii wide
    condition:
        any of them
}

Syntax validiert (0 Fehler)

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("Thoughts on this AppImage behavior")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - count

Syntax validiert (0 Fehler)

message: "*Thoughts on this AppImage behavior*"

Syntax validiert (0 Fehler)

CommonSecurityLog
| where Message has "Thoughts on this AppImage behavior"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

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