Is pplus400_424us.exe safe?
No antivirus engine detected malware in this long-observed executable, although process-injection mapping, startup persistence, and an unchecked direct-IP connection justify ordinary caution.
All 79 antivirus engines avoided a malware detection, including the tier-1 participants that completed analysis, and no malicious sandbox verdict or child file was established. The executable is unsigned and one sandbox mapped process injection, startup persistence, and contact with an IP whose reputation was not checked, so obtain it from a trusted source.
ff7b7606f15cc265a4…d9b14a428e381aRecommended next actions
Before running
Run it only when it came from the developer's official site or another source you independently trust.
If you already ran 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.
All 79 antivirus engines avoided a malware detection, including the tier-1 participants that completed analysis, and no malicious sandbox verdict or child file was established. The executable is unsigned and one sandbox mapped process injection, startup persistence, and contact with an IP whose reputation was not checked, so obtain it from a trusted source.
The strongest evidence is the complete absence of detections across 79 antivirus engines, with no tier-1 family consensus. The file has also been observed for more than 16 years without a curated threat-intelligence or YARA rule hit. One completed sandbox mapped T1055 and T1547.001, but it did not issue a malicious runtime verdict, and such mappings can occur in older system utilities or installers. Ten dropped files were inspected without an identified malicious child, although their individual verdicts remain unknown. The direct connection to 20.99.184.37 remains unresolved because a complete host-reputation check was not available, while the lack of a digital signature reduces publisher assurance.
What We Detected
None of 79 antivirus engines flagged the executable, and engines.tier1Malicious=0. The file was first submitted in 2010, while CIRCL, MalwareBazaar, and YARAify provided no corroborating threat-intelligence hits.
Threat Behavior
One completed sandbox mapped activity to T1055 process injection and T1547.001 startup persistence, but behaviour.hasMaliciousSandboxVerdict=false. It also observed a direct connection to 20.99.184.37; contactedHosts=null means no complete reputation result is available for that address. Ten dropped files were inspected without an identified malicious child, although all ten remain individually unclassified.
What To Do Now
Use the executable only if it came from the expected vendor or a trusted archive, and keep endpoint protection enabled. If its origin is uncertain, verify the SHA-256 hash with the distributor or test it in an isolated environment before installation.
Where this verdict could be wrong4 caveats
- The completed sandbox mapped activity to T1055 process injection and T1547.001 registry run-key or startup-folder persistence, both offensive techniques requiring caution.
- The sample contacted 20.99.184.37 directly, and contactedHosts=null means no complete host-reputation result is available.
- signing.applicable=true but signing.signed=false, so no verified publisher identity supports the file.
- All 10 inspected dropped children have unknown verdicts, limiting the reassurance provided by droppedChildren.hasMaliciousChild=false.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/79 antivirus engines reported malware
- engines.tier1Malicious=0 with seven tier-1 undetected results
- behaviour.hasMaliciousSandboxVerdict=false
- droppedChildren.hasMaliciousChild=false
- No CIRCL, MalwareBazaar, or YARAify hit
- Unsigned Win32 executable with signing.applicable=true and signing.signed=false
- Runtime mapping to T1055 process injection
- Runtime mapping to T1547.001 startup persistence
- Direct connection to 20.99.184.37 without a completed host-reputation cross-check
- All 10 dropped children remain individually unclassified
Use only a copy obtained from a trusted distribution source and keep endpoint protection enabled. For an uncertain download, verify SHA-256 ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a before running it.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 79 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Partial1 runtime contact was observed without a completed reputation cross-check.
YARA
Complete2 signature or behavior rules 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
- 7MITRE ATT&CK techniques
- 3spawned processes
- 1network contacts
- 36filesystem & mutex artifacts
Attack story
Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.
Input file
The submitted object
- FileObserved
pplus400_424us.exe
ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
%SAMPLEPATH%\ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a.exe
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Windows\System32\wuapihost.exe
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
setup.ex_
C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.ex_
04Isolated runtime analysis - Written fileObserved
setup.exe
C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.exe
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
20.99.184.37
Contact observed during runtime.
06Isolated runtime analysis
6 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.
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.
- 20.99.184.37
- C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.ex_
- C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.exe
- C:\Program Files\ProxyPlus\ProxyPlus.exe
- C:\Program Files\ProxyPlus\ContentType.TXT
- C:\Program Files\ProxyPlus\ProxyHelp.htm
- C:\ProgramData\Microsoft\Windows\WER\Temp\WER1121.tmp.WERInternalMetadata.xml
- C:\ProgramData\Microsoft\Windows\WER\Temp\WER11FC.tmp.csv
- C:\ProgramData\Microsoft\Windows\WER\Temp\WER123C.tmp.txt
- C:\Windows\System32\spp\store\2.0\cache\cache.dat
- C:\ProgramData\Microsoft\Windows\WER\Temp\WER27D6.tmp.WERInternalMetadata.xml
- CTF.LBES.MutexDefaultS-1-5-21-1482476501-1645522239-1417001333-500
- CTF.Compart.MutexDefaultS-1-5-21-1482476501-1645522239-1417001333-500
- CTF.Asm.MutexDefaultS-1-5-21-1482476501-1645522239-1417001333-500
- CTF.Layouts.MutexDefaultS-1-5-21-1482476501-1645522239-1417001333-500
- CTF.TMD.MutexDefaultS-1-5-21-1482476501-1645522239-1417001333-500
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- e298e148988bc6fe6416…f535e5Never scannednever seen before
- 8fc0f001da8b2626c2a3…a192fdNever scannednever seen before
- d9db406dde741f073d92…4da725Never scannednever seen before
- 56414ace0d373c5168a9…95a6d4Never scannednever seen before
- 971d37446733f4f51bcd…8af44fNever scannednever seen before
- 9c28592acea94cdea74a…34879aNever scannednever seen before
- 27e4fc4272086b95c4b3…dc3876Never scannednever seen before
- 8d2f4103571dbe328565…4f1f28Never scannednever seen before
- c6fffd8c23d676e3d8f0…9e9499Never scannednever seen before
- 24a65591c3abd2b4799d…243b90Never 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.
- 2rule hits recorded
- 0 / 79engines flagged
- 13sources 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 79 antivirus engines flagged the file.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 02
1 high-confidence signature or behavior rule matched this file.
Verdict inputView chapterProvenanceDerivedSourceSignature and behavior rulesObserved at - 03
The hash has been submitted 14 times from 13 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: pplus400_424us.exe — ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — %SAMPLEPATH%\ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a.exe
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Windows\System32\wuapihost.exe
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: setup.ex_ — C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.ex_
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: setup.exe — C:\Documents and Settings\Administrator\Local Settings\Temp\Proxy+\setup.exe
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 20.99.184.37 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
The available sources did not agree on a named threat category.
MalwareBazaar, YARAify, and CIRCL hashlookup completed and returned no entries for 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%SAMPLEPATH%\ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381a.exeThe sample contacted an external IP address directly and no application domain was recorded. Direct-IP traffic also occurs in legitimate installers and infrastructure, so this is supporting context only and requires corroboration from host reputation and other runtime evidence.
Evidence20.99.184.37
0 of 79 engines flagged this file
View all 79 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
Moderate prevalence — neither rare nor common. No strong prior applies.
Fingerprint and provenance
- File name
- pplus400_424us.exe
- Format
- Win32 EXE
- Code signing
- No verified publisher
- Size
- 1.4 MB
- Last analyzed
- Sep 17, 2026, 7:32 AM UTC
ff7b7606f15cc265a4d9bc5acdd61a2b445568bbb0fb9fb23bd9b14a428e381aSafety & 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
Run it only when it came 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 pplus400_424us.exe safe?
What is pplus400_424us.exe?
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Community
Member reviews and reports for this exact file hash.