Is steam_api.dll safe?
This Valve-signed Steam library has no detections across 75 engines, broad long-term prevalence, consistent signer history, and no corroborated harmful activity.
The DLL is verified as signed by Valve Corp., and none of 75 antivirus engines detected it. Its extensive submission history, four matching signer-based benign precedents, inspected network contacts, and lack of harmful child files strongly support its legitimacy despite one uncorroborated process-injection heuristic.
1add7f151fa644870a…d3ecc7482dccbcRecommended next actions
Before using
Use it only as part of software obtained from the developer's official site or another source you independently trust.
If you already used it
Keep normal device protection enabled and stop if the file behaves unexpectedly.
Intelligence
The saved assessment, checked against the scan evidence and recorded coverage.
The reasoning behind this verdict
This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.
The DLL is verified as signed by Valve Corp., and none of 75 antivirus engines detected it. Its extensive submission history, four matching signer-based benign precedents, inspected network contacts, and lack of harmful child files strongly support its legitimacy despite one uncorroborated process-injection heuristic.
None of 75 antivirus engines flagged the file, including all 17 tier-1 engines. The signature verifies to Valve Corp., and the available signer history contains four benign samples and no malicious ones. The file is well established, appearing in 19,234 submissions from 3,726 sources, while four signer-matched files previously received benign assessments. One sandbox mapped activity to T1055 and T1562.001, but it issued no malicious verdict; all four observed hosts were fully checked without a malicious or suspicious match, and none of eight inspected children was identified as malicious. No packing, high-entropy code, brand mismatch, YARA rule match, or named malware family provides corroboration for the behavioral heuristic.
What We Detected
The file is a verified Valve Corp. DLL associated with Steam. None of 75 antivirus engines detected it, including all 17 tier-1 engines. It is also widely established, with 19,234 submissions from 3,726 sources, and four signer-matched files previously received benign assessments.
Threat Behavior
One completed sandbox mapped activity to T1055 and T1562.001, including DLL execution through rundll32. That mapping deserves notice, but the sandbox did not issue a malicious verdict, and there was no corroboration from antivirus detections, YARA rules, packing indicators, persistence, brand mismatch, malicious child files, or network reputation. All four distinct observed hosts were covered by the host check and had no malicious or suspicious cache matches.
What To Do Now
Use the DLL when it came from Steam or the associated game's official installation directory. If it appeared separately in an unexpected download, verify the Valve Corp. signature and restore the file through Steam rather than trusting an unrelated copy.
Where this verdict could be wrong3 caveats
- MalwareTips.Synth.ProcessInjection mapped sandbox activity to T1055, although the heuristic explicitly states that it does not prove the injection method or intent.
- behaviour.offensiveTechniques also includes T1562.001, but the single completed sandbox did not issue a malicious verdict.
- One community annotation described the sample as suspicious, while other annotations described no threat; these uncorroborated comments carry less weight than the independent scan evidence.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/75 antivirus engines detected the file.
- Verified digital signature from Valve Corp.
- Signer history contains 4/4 safe samples and 0 malicious samples.
- Four signer-matched prior assessments were safe.
- All four observed hosts were inspected with no malicious or suspicious matches.
- Runtime evidence mapped activity to possible process injection under T1055.
- Runtime evidence also included T1562.001, a technique associated with impairing defenses.
- Only one completed sandbox run is available.
Keep endpoint protection enabled and use this DLL only from Steam or the game's official installation. If its location or origin is unexpected, validate the Valve Corp. signature or reacquire it through Steam.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 75 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Complete4 contacted hosts were cross-checked.
YARA
Complete1 signature or behavior rule matched.
External intel
Complete3 of 3 independent reference sources completed.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime flight recorder
Capture complete- 1isolated sandbox run
- 17MITRE ATT&CK techniques
- 15spawned processes
- 4network contacts
- 7filesystem & mutex artifacts
What this file did when executed
This file was detonated in 1 sandbox and its runtime behaviour was observed.
Adversary techniques mapped to the MITRE ATT&CK framework.
- ax-0001.ax-msedge.net
- tse1.mm.bing.net
- windows.msn.com-ion.edgesuite.net
- a1672.dscr.akamai.net
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Windows Error Reporting\Debug\ExceptionRecord
- \Device\ConDrv\\Connect
- C:\ProgramData\Microsoft\Windows Security Health\Logs
- \Sessions\1\BaseNamedObjects\DBWinMutex
- \BaseNamedObjects\Local\SM0:3868:304:WilStaging_02
- \BaseNamedObjects\Local\SM0:3868:120:WilError_03
- \BaseNamedObjects\Local\ZonesCacheCounterMutex
- \BaseNamedObjects\Local\ZonesLockedCacheCounterMutex
Files this sample writes at runtime
This file drops 8 children at runtime. None are currently flagged malicious in our cache.
- eaeb2c619b4e70e5afa0…f23ebdNever scannednever seen before
- e8d3c9c059b07846e236…71f755Never scannednever seen before
- 1c702bc2e7de1a066ca4…9e33e7Never scannednever seen before
- 7e493b3e6cc9a24422c9…4d1d1eNever scannednever seen before
- fa95a176d73614c1f6c7…ae47a4Never scannednever seen before
- 184d5381dd59281e4150…38e28cNever scannednever seen before
- 3488d067116623f81d1e…1b743bNever scannednever seen before
- 51efb033c4707e4e507c…35aae1Never scannednever seen before
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Evidence integrity
Chain of custody for the facts preserved in this report.
- 1rule hit recorded
- 0 / 75engines flagged
- 3,726sources in submission history
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
0 of 75 antivirus engines flagged the file.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 02
The hash appears in a known-software reference database.
Verdict inputView chapterProvenanceObservedSourceReference software databaseObserved at - 03
The hash has a long, established submission history across 3,726 sources.
Verdict inputView chapterProvenanceDerivedSourceSubmission historyObserved at - 04
Scanned file: steam_api.dll — 1add7f151fa644870a735ae86e68d1f019f296130d8e7c0a7ed3ecc7482dccbc
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — "C:\Windows\sysnative\rundll32.exe" "C:\Users\<USER>\Desktop\attachment.dll",#1
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Windows\System32\loaddll64.exe loaddll64.exe "C:\Users\user\Desktop\steam_api64.dll"
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: Connect — \Device\ConDrv\\Connect
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: Logs — C:\ProgramData\Microsoft\Windows Security Health\Logs
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: ax-0001.ax-msedge.net — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at - 10
Contacted host: tse1.mm.bing.net — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
The available sources did not agree on a named threat category.
One or more independent reference databases matched this hash.
Signatures and behavior heuristics
A community signature or high-severity behavioral heuristic matched. Signatures identify known patterns; heuristics are strong leads but are not proof on their own.
The saved runtime evidence maps this activity to MITRE T1055 (Process Injection). The mapping supports possible process injection, but it does not prove the exact injection method or the operator's intent.
Evidence"C:\Windows\sysnative\rundll32.exe" "C:\Users\<USER>\Desktop\attachment.dll",#1
0 of 75 engines flagged this file
View all 75 engine results
Section entropy & packers
No high-entropy executable section or known packer signature was detected. Data and resource sections can still have high entropy without indicating packed code.
How widely this file has been seen
Widely seen in the wild for a long time. High prior this is legitimate; isolated detections on common-old files are usually false positives.
Fingerprint and provenance
- File name
- steam_api.dll
- Format
- Win32 DLL
- Code signing
- Signature valid: Valve Corp.
- Size
- 293.4 KB
- Last analyzed
- Oct 8, 2026, 2:20 AM UTC
1add7f151fa644870a735ae86e68d1f019f296130d8e7c0a7ed3ecc7482dccbcSafety & FAQ
Complete recovery guidance and answers for the next decision.
What to do now
This file appears low risk based on the evidence available now.
- Recovery step 01
Use it only as part of software obtained from the developer's official site or another source you independently trust.
- Recovery step 02
A clean result reduces known risk, but it cannot guarantee that every new or targeted threat has been detected.
- Recovery step 03
Keep your antivirus and Windows updates switched on so you stay protected.
Safety FAQ
Direct answers grounded in the saved verdict and evidence in this report.
Is steam_api.dll safe?
What is steam_api.dll?
How many antivirus engines detected steam_api.dll?
Is steam_api.dll digitally signed?
What is the SHA-256 hash of steam_api.dll?
Is it safe to use steam_api.dll?
How up to date is this analysis of steam_api.dll?
Community
Member reviews and reports for this exact file hash.