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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchAtomBombing was described as “unpatchable” by its researchers because it used Windows mechanisms they considered to be working as designed—not because they had identified a conventional coding flaw. That is a historical explanation, not a current Microsoft ruling. The available account describes a code-injection technique using Windows atom tables and asynchronous procedure calls (APCs); it does not establish how every Windows release today behaves or prove that any particular security product blocks it.
Why researchers called AtomBombing unpatchable
In an October 27, 2016 technical account, Tal Liberman described AtomBombing as a way to inject code into another Windows process using global atom tables and APC behavior. The accompanying 2017 talk summary says its presenters considered the technique unpatchable because it relied on how operating-system mechanisms were designed, rather than on broken or flawed code. Read Liberman’s account, republished by FortiGuard Labs and the BSidesSF 2017 talk listing.
“Cannot be patched” should therefore be read as the researchers’ characterization of the technique, not as proof that Windows is permanently vulnerable, that all versions remain affected, or that Microsoft has issued a current AtomBombing-specific decision. A design-level technique can still be relevant to security defenses even when it does not map neatly to a single defective line of code.
How the technique works at a high level
Windows atom tables provide a way to store and retrieve strings by atom identifier. Liberman’s historical write-up describes using GlobalAddAtom to place a string in the global atom table, then using GlobalGetAtomName so a target process can retrieve it. The article organizes the approach into three stages:
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- Write-What-Where: place data in the atom table and arrange for it to be available to the target process.
- Execution: use APC behavior to get the target process to call the retrieval function, enabling the described code-injection sequence.
- Restoration: restore the thread’s execution after the injected work.
This is a summary of the 2016 account, not an independently reproduced procedure or a current operational guide. Its security significance is that code may run inside a process belonging to a legitimate application, complicating defenses that look only for unfamiliar or obviously malicious applications.
What the reported Windows testing does—and does not—show
The BSidesSF 2017 listing says the presenters tested Windows 10 and Windows 7 and claimed the technique affected all Windows versions at that time. Those are historical claims from a talk listing dated February 13, 2017—not a compatibility test of Windows releases introduced later, nor evidence that every present-day configuration is exploitable.
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Fortinet identifies Liberman’s October 27, 2016 article as originally published by enSilo and republished for FortiGuard Labs research; Fortinet notes that enSilo was acquired in October 2019. The republished article and the presentation summary are the basis for the dated technical and scope claims here.
How Microsoft’s servicing policy fits in
Microsoft’s general Windows Security Servicing Criteria says the company evaluates whether a reported issue violates the goal or intent of a security boundary or feature and whether its severity meets the servicing bar. Microsoft defines a security boundary as “a logical separation between the code and data of security domains with different levels of trust.” Its stated intent is to address qualifying issues through security updates and/or guidance for affected supported offerings where commercially reasonable.
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Microsoft’s servicing criteria is general policy context. It does not name AtomBombing in the passages reviewed, so it should not be treated as a newer confirmation or reversal of the researchers’ 2016–2017 explanation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the technique means for defenders
SecurityWeek’s October 30, 2016 report described the researchers’ concern that injection into a legitimate process could evade defenses focused on recognizing malicious applications. It gave examples such as taking screenshots or accessing data available in the logged-in user’s context. These are illustrative possibilities from that report, not proof of current exploitation prevalence or guaranteed outcomes in every environment. Read SecurityWeek’s contemporary report.
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For practical risk management, focus on broader layers of defense rather than assuming a single patch or product provides a complete answer:
- Keep supported Windows installations and security software updated; updates address many security issues even when a particular historical technique is not the subject of a dedicated fix.
- Use endpoint monitoring and response capabilities to investigate suspicious behavior within otherwise legitimate processes. The available sources do not establish that any named product prevents AtomBombing.
- Limit account privileges and access to sensitive information so activity in a user’s context has fewer consequences.
- Treat claims of specific detection or prevention as vendor claims unless supported by independent testing for the relevant behavior and Windows versions.
The sources reviewed do not provide a current independent comparison of commercial products, a present-day AtomBombing compatibility test, or prevalence statistics. They support explaining the historical technique and its defensive implications, not declaring that a specific vendor blocks it.
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