Our call: Is ARCLoader.7z safe?Suspicious
- 1 high-confidence signature or behavior rule matched this file.Derived · Signature and behavior rules
- 8 of 75 antivirus engines flagged the file, including alibabacloud and Antiy-AVL.Observed · Antivirus analysis
- The hash has been submitted 4 times from 4 sources.Derived · Saved report facts
3822081b8f1990a93c…6b22d8e7c6Recommended next actions
Before opening or extracting
Do not open or extract it until the source can be verified independently.
If you already opened or extracted it
Stop using it, scan the device, and watch for unexpected behavior or security alerts. Get a fresh copy from the original trusted source and verify its exact hash when possible.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete8 of 75 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.
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
ARCLoader.7z
3822081b8f1990a93cd887e590611131208613df661c436edc09926b22d8e7c6
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
"C:\Windows\system32\rundll32.exe" "C:\Users\<USER>\AppData\Local\Temp\ARChandler.dll",#1
02Isolated runtime analysis - ProcessObserved
Observed process
"C:\Windows\system32\rundll32.exe" "C:\Users\<USER>\AppData\Local\Temp\ARCinjector.dll",#1
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
Temp
C:\ProgramData\Microsoft\Windows\WER\Temp
04Isolated runtime analysis - Written fileObserved
dff2c86a-f8d8-491b-ac92-ea03430f7f93
C:\ProgramData\Microsoft\Windows\WER\Temp\dff2c86a-f8d8-491b-ac92-ea03430f7f93
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
162.159.36.2
Contact observed during runtime.
06Isolated runtime analysis
6 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
1 high-confidence signature or behavior rule matched this file.
Verdict inputView chapterProvenanceDerivedSourceSignature and behavior rulesObserved at - 02
8 of 75 antivirus engines flagged the file, including alibabacloud and Antiy-AVL.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 03
The hash has been submitted 4 times from 4 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: ARCLoader.7z — 3822081b8f1990a93cd887e590611131208613df661c436edc09926b22d8e7c6
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — "C:\Windows\system32\rundll32.exe" "C:\Users\<USER>\AppData\Local\Temp\ARChandler.dll",#1
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — "C:\Windows\system32\rundll32.exe" "C:\Users\<USER>\AppData\Local\Temp\ARCinjector.dll",#1
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: Temp — C:\ProgramData\Microsoft\Windows\WER\Temp
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: dff2c86a-f8d8-491b-ac92-ea03430f7f93 — C:\ProgramData\Microsoft\Windows\WER\Temp\dff2c86a-f8d8-491b-ac92-ea03430f7f93
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 162.159.36.2 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Intelligence
The saved assessment, checked against the scan evidence and recorded coverage.
No saved analyst narrative
This report keeps the verified scan facts available below without inventing an analysis that was not saved with the scan.
Behavior
Plain-English impact first, then the observed runtime evidence.
What this file does
Observed actions and their security significance
High concern: Injected code into another process, a technique that can conceal execution.
High concern: Used an input-capture technique that can record credentials or keystrokes.
High concern: Attempted to impair or bypass security controls.
High concern: Manipulated how the operating system loads code, which can redirect execution.
Moderate concern: Communicated over a common application protocol; malware can use this for command-and-control.
Moderate concern: Checked the environment for virtualisation or analysis tools.
Note: Reads your Windows user-account details.
These are observed capabilities from an isolated analysis. A technique does not prove malicious intent on its own, and the file never ran on your device.
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.
- 162.159.36.2
- C:\ProgramData\Microsoft\Windows\WER\Temp
- C:\ProgramData\Microsoft\Windows\WER\Temp\dff2c86a-f8d8-491b-ac92-ea03430f7f93
- C:\ProgramData\Microsoft\Windows\WER\ReportQueue
- C:\ProgramData\Microsoft\Windows\WER\Temp\d9765631-780f-4308-9def-96c684d18429
- C:\ProgramData\Microsoft\Windows\WER\ReportArchive
Files this sample writes at runtime
This file drops 7 children at runtime. None are currently flagged malicious in our cache.
- d8cd5b515c8e8edc88e5…21b177Never scannednever seen before
- 6192d654fd0a13afd803…0229f1Never scannednever seen before
- b68409c9d8b81321c3b7…c11ac9Never scannednever seen before
- 528837e2522323c54013…641a7aNever scannednever seen before
- bc93ac9a0fe6b7d60c68…0d3127Never scannednever seen before
- 469c9a32ffc0b7224086…2730ebNever scannednever seen before
- 81d125b27784f59226d0…8c0c96Never scannednever seen before
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Detection sources at a glance
Category: generic-trojan
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.
MITRE T1055 (Process Injection) observed — CreateRemoteThread / APC / reflective-DLL injection. The payload is being smuggled into a legitimate process to bypass AV hooks.
Evidence"C:\Windows\system32\rundll32.exe" "C:\Users\<USER>\AppData\Local\Temp\ARChandler.dll",#1The 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.
Evidence162.159.36.2
8 of 75 engines flagged this file
View all 75 engine results
PE structure
Not applicablePE structure analysis applies to Windows executable formats, not this file type.
How widely this file has been seen
Moderate prevalence — neither rare nor common. No strong prior applies.
Fingerprint and provenance
- File name
- ARCLoader.7z
- Format
- 7ZIP
- Code signing
- Not applicable to this file type
- Size
- 11.0 MB
- Last analyzed
- Jun 15, 2026, 7:27 PM UTC
3822081b8f1990a93cd887e590611131208613df661c436edc09926b22d8e7c6Safety & FAQ
Complete recovery guidance and answers for the next decision.
What to do now
We couldn't fully clear this file. Treat it with caution.
Don't open or extract it unless you're certain it came from a source you trust.
Check where you got it — an unexpected attachment or a random download link is a red flag.
If its origin cannot be confirmed, delete this archive and use a fresh copy from a trusted source. Get a fresh copy from the original trusted source and verify its exact hash when possible.
If you're still unsure, scan it again in a day or two — detections often catch up on newer files.