File scan report
Verdict Safe
Is avcodec-
FFmpeg codec library (avcodec-60.dll) with zero major detections, 2210 submissions, and legitimate export functions; rule-based trigger is sandbox testing artifact.
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Strong evidence · Widely seen for a long time, and nothing harmful found.
Good practice2 tips
We found nothing harmful in this file.
Use it only as part of a program you got from the developer's own website.
Keep your antivirus and Windows updates switched on.
No scanner can promise a file is 100% safe.
Reads the latest antivirus results for this file's hash. Nothing is uploaded.
Antivirus results
0 of 70 flagged
- Flagged 0
- No detection 70
- No result 4
- Code signing Unsigned
- Test run Completed
- First seen 1y ago
Chapter 02
Why we think so
0 points against it and 5 in its favour, checked against the scan evidence.
The reasoning behind this verdict
This file is avcodec-60.dll, a legitimate FFmpeg audio codec library. All 17 major antivirus engines (BitDefender, Kaspersky, ESET, Fortinet, etc.) report it clean. Community analysis confirms no threat.
The file exhibits a clean engine consensus: 0 malicious detections across 70 reporting engines, with 17 major antivirus engines explicitly reporting it undetected. The filename and exports (av_ac3_parse_header, av_adts_header_parse, av_bsf_alloc) match the legitimate FFmpeg codec library, which has been submitted 2,210 times over 467 days with consistent clean verdicts. No malicious sandbox verdicts, contacted hosts, or files it created were observed. External community analysis (FileScan.IO) confirms 'NO_THREAT' with 100% confidence.
What We Detected
File: avcodec-60.dll (3.8 MB Win32 DLL, 64-bit). Filename and exports match the FFmpeg audio codec library, a widely-used open-source component.
Threat Behavior
One rule-based rule flagged MITRE T1055 based on rundll32.exe execution with DLL export names. However, the evidence shows standard codec function calls (av_ac3_parse_header, av_adts_header_parse, av_bsf_alloc) — legitimate FFmpeg operations used during sandbox analysis, not malware injection patterns. No complete contacted-host reputation result was available. No files it created. Community analysis (FileScan.IO) reports 'NO_THREAT' with 100% confidence.
What To Do Now
This file is safe to use. It is a legitimate, widely-distributed codec library with 2,210 submissions over 467 days and consistent clean verdicts from all major antivirus vendors. The rule-based trigger is a false positive caused by sandbox testing methodology. No action required.
Where this verdict could be wrong3 caveats
- One of our behaviour rules matched on detection — if the DLL truly performed reflective injection into rundll32 or other processes, this could indicate code-injection malware. However, the evidence shows only standard DLL export function calls (av_ac3_parse_header, etc.), which are legitimate codec operations, not injection payloads. The rule-based appears to have conflated sa
- File is unsigned and has no signer history — in isolation, this could raise suspicion. However, FFmpeg and many open-source codec libraries are distributed unsigned, and the 2210 submissions over 467 days with zero major detections strongly indicate this is a known-benign component.
- Anti-debug and anti-VM tags in community comment could suggest evasion — but these are common analysis artifacts in sandbox reports and do not indicate malware intent when paired with zero malicious detections and legitimate codec function exports.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- Zero malicious detections across 70 engines; 17 major antivirus engines all report clean
- Legitimate FFmpeg codec library (avcodec-60.dll) with known exports
- Common_old prevalence: 2,210 submissions, 1,905 unique sources, 467 days in circulation
- No complete contacted-host reputation result was available. No files it created
- Community analysis (FileScan.IO) confirms 'NO_THREAT' with 100% confidence
6 sources checked · 5 complete · 1 not needed or not applicable. See every source
Chapter 03
What it did in our test
It ran in our isolated test environment; no test environment rated what it did as risky.
Test run summary
Capture complete- 11sandbox rule tags
- 13spawned processes
- 0network contacts
- 2filesystem & mutex artifacts
What this file did when executed
This file was run in a sandbox and its runtime behaviour was observed.
Techniques observed in the sandbox
11MITRE ATT&CK techniques the sandbox mapped. Highlighted ones are rare in normal software; the others are common in legitimate programs too.
- T1027· Obfuscated code
- T1027.002· Obfuscated code
- T1055· Process injection
- T1071· Application protocol
- T1082· System recon
- T1129· Loads modules
- T1218.011
- T1497· Sandbox evasion
- T1497.001· Sandbox evasion
- T1518.001· Checks your AV
- T1574.002· Execution hijack
Observed activity
Processes started
13Programs the file ran, with their command lines.
rundll32.exe"C:\Windows\sysnative\rundll32.exe" "C:\Users\<USER>\Desktop\avcodec-60.dll",#1loaddll64.exeC:\Windows\System32\loaddll64.exe loaddll64.exe "C:\Users\user\Desktop\avcodec-60.dll"cmd.exeC:\Windows\System32\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\avcodec-60.dll",#1rundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\avcodec-60.dll",#1rundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\avcodec-60.dll,av_ac3_parse_headerrundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\avcodec-60.dll,av_adts_header_parse
Show all 13 entries for processes started
rundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\avcodec-60.dll,av_bsf_allocloaddll64.exeC:\Windows\System32\loaddll64.exe loaddll64.exe "C:\Users\user\Desktop\attachment.dll"cmd.exeC:\Windows\System32\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\attachment.dll",#1rundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe "C:\Users\user\Desktop\attachment.dll",#1rundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\attachment.dll,av_ac3_parse_headerrundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\attachment.dll,av_adts_header_parserundll32.exeC:\Windows\System32\rundll32.exe rundll32.exe C:\Users\user\Desktop\attachment.dll,av_bsf_alloc
Files
1Files the file created, changed or deleted.
- Written
\Device\ConDrv\\Connect
Mutexes
1Named locks a program uses so only one copy runs; malware families often reuse them.
\Sessions\1\BaseNamedObjects\Local\SessionImmersiveColorMutex
Sandbox background — not the file
1The analysis machine's own processes and connections, recorded in every run.
- VM process
conhost.exeC:\Windows\System32\conhost.exe C:\Windows\system32\conhost.exe 0xffffffff -ForceV1
Chapter 04
Technical details
None of the 70 antivirus engines that checked it flag it; no publisher signature.
Sources checked
Every check behind this verdict
6 sources checked · 5 complete · 1 not needed or not applicable. Complete means the check returned a usable result; it does not mean the file is safe.
File fingerprint
- Last analyzed
- Jun 10, 2026, 1:36 PM UTC
- SHA-256
a9002e019e8eed38becdab73c01b6d2e85850657ff752c31bb8f68438f671894- SHA-1
2ffce00bdbae0aafbc9affe163d24484f909fc72- MD5
0da8020a95d29fd7c7ef020f38845115
About this file
avcodec-60.dll is a Win32 DLL file of 3.8 MB.
- Type and size
- Win32 DLL · 3.8 MB
- Signer
- UnsignedNo code signature.
- First seen
- Feb 28, 2025On VirusTotal.
- Submitted by
- 1,905 distinct sources
- Packer
- None detected
- Entropy
- 6.47 of 8
First scanned
Antivirus consensus
0 of 70 engines flagged this file
4 of the 74 engines returned no result for this file (file type not supported, or the scan did not finish), so they did not check it.
- Tier-118 engines0flagged
- Tier-235 engines0flagged
- Low-trust17 engines0flagged
View all 74 engine results
- AcronisClean
- AhnLab-V3Clean
- AlibabaClean
- alibabacloudClean
- ALYacClean
- Antiy-AVLClean
- APEXClean
- ArcabitClean
- AvastClean
- Avast-MobileNo result
- AVGClean
- AviraClean
- BitDefenderClean
- BitDefenderFalxNo result
- BkavClean
- CAT-QuickHealClean
- ClamAVClean
- CMCClean
- CrowdStrikeClean
- CTXClean
- CylanceClean
- CynetClean
- DeepInstinctClean
- DrWebClean
- ElasticClean
- EmsisoftClean
- ESET-NOD32Clean
- F-SecureClean
- FortinetClean
- GDataClean
- GoogleClean
- GridinsoftClean
- huorongClean
- IkarusClean
- JiangminClean
- K7AntiVirusClean
- K7GWClean
- KasperskyClean
- KingsoftClean
- LionicClean
- MalwarebytesClean
- MaxSecureClean
- McAfeeDClean
- MicrosoftClean
- MicroWorld-eScanClean
- NANO-AntivirusClean
- PaloaltoClean
- PandaClean
- RisingClean
- SangforClean
- SentinelOneClean
- SkyhighClean
- SophosClean
- SUPERAntiSpywareClean
- SymantecClean
- SymantecMobileInsightNo result
- TACHYONClean
- tehtrisClean
- TrapmineClean
- TrellixENSClean
- TrendMicroClean
- TrendMicro-HouseCallClean
- TrustlookNo result
- VaristClean
- VBA32Clean
- VIPREClean
- VirITClean
- ViRobotClean
- WebrootClean
- XcitiumClean
- YandexClean
- ZillyaClean
- ZoneAlarmClean
- ZonerClean
Signatures and behavior heuristics
Low-severity pattern matches — worth noting but not on their own cause for alarm.
VirusTotal's sandbox summary maps this run to MITRE T1055 (Process Injection), but no injected process of the sample's own was recorded (the analysis VM's own WMI adapter, crash handlers and Chrome updater are not counted). VirusTotal maps T1055 on about half of all files no engine flags, so the mapping alone is not evidence of injection.
EvidenceT1055 (sandbox MITRE mapping)
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.
Chapter 05
Questions & answers
Short answers to the 6 questions people ask most about this file.
Is avcodec-60.dll safe?
What is avcodec-60.dll?
How many antivirus engines detected avcodec-60.dll?
What is the SHA-256 hash of avcodec-60.dll?
Is it safe to use avcodec-60.dll?
How up to date is this analysis of avcodec-60.dll?
Community
Member reviews and reports for this exact file hash.