Suspicious
Unsigned installer with process-injection heuristic and packed code, but only low-trust detection and no confirmed malicious runtime behaviour.
92fa6553260b490db3…ffa40aa935The verdict, reasoned out.
Not a rules engine. The MT AI Engine reads every signal we collected, weighs them against history, and commits to an answer.
This file presents a mixed-signal profile. The process-injection heuristic and high entropy suggest obfuscation or packing, which are concerning. The unsigned status and installer filename without cryptographic validation add risk. However, the detection is isolated to a single low-trust engine, tier-1 engines are silent, and runtime analysis did not confirm malicious activity. The RAG history shows prior imphash matches verdicted both suspicious and safe, indicating the imphash may be shared across legitimate and questionable installers. The absence of external intel corroboration (no YARA rules, no MalwareBazaar family, no CIRCL hit) suggests this is not a known malware family. The balance of evidence points to a borderline case: suspicious enough to warrant caution, but insufficient for a malicious verdict.
Each signal cites a concrete token from the evidence the arbiter saw — engine name, MITRE technique, signer string, or an exact count.
engines: 1/60 malicious (MaxSecure low-trust only); tier1Malicious=0; onlyLowTrustFlagging=true
triggeredHeuristics: MalwareTips.Synth.ProcessInjection (high severity) — T1055 CreateRemoteThread/APC injection + T1562.001 defense evasion observed
PE analysis: entropy=7.66, highEntropyCode=true, likelyPacked=true — packed/obfuscated code structure
similarHashes: 5 prior imphash verdicts — 2 'suspicious', 1 'safe' (Microsoft-signed), 1 'unknown', 1 'suspicious' — mixed consensus, no strong malicious trend
signing.verified=false, unsigned, no signer history — no trusted publisher validation; filename 'PolarInstaller.exe' lacks cryptographic backing
- 14 tier-1 engines reported clean; no tier-1 malicious consensus
- No malicious sandbox verdict despite heuristic trigger
- No malicious contacted hosts, no dropped malicious children, no C2 beaconing
- No external intel corroboration (CIRCL, YARAify, MalwareBazaar all negative)
- Prior imphash match verdicted 'safe' (Microsoft-signed MinecraftInstaller) — suggests imphash may be shared by legitimate installers
- Unsigned executable with no signer history or trusted publisher match
- High entropy (7.66) and indicators of packing or code obfuscation
- Process injection heuristic (T1055) and defense evasion (T1562.001) detected in sandbox
- Installer filename without cryptographic validation
- Only 1 low-trust engine flagged; tier-1 engines silent — weak detection consensus
Treat this file as suspicious pending further investigation. Do not execute on production systems. Verify the publisher's legitimacy through official channels and consider isolated sandbox testing with network monitoring before deployment.
1 contradiction resolved by the scoring engine
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.
- C:\ProgramData\Microsoft\Windows\WER\Temp
- C:\ProgramData\Microsoft\Windows\WER\Temp\46dda17b-2eed-4c46-81c5-cbdd3d22bf70
- C:\ProgramData\Microsoft\Windows\WER\ReportQueue
- C:\ProgramData\Microsoft\Windows\WER\Temp\e2f34651-57e0-46be-866a-72d41e2b98f8
- C:\ProgramData\Microsoft\Windows\WER\ReportArchive
- \Sessions\1\BaseNamedObjects\Local\__DDrawExclMode__
- \Sessions\1\BaseNamedObjects\Local\__DDrawCheckExclMode__
YARA + heuristic rules that fired
A researcher-curated or high-severity heuristic rule matched this sample. These rules target specific malware families and are near-definitive.
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:\Users\<USER>\Desktop\PolarInstaller_6.0.3.exe"
1 detection across 75 engines
Section entropy & packers
Executable sections have high entropy (7.2+) — the code is compressed or encrypted and only decrypted at runtime. Classic packing behaviour.
How often this file shows up in the wild
Moderate prevalence — neither rare nor common. No strong prior applies.
Forensic fingerprint
- File name
- PolarInstaller.exe
- Size
- 9.55 MB
- MIME type
- (unknown)
- Detected type
- Win32 EXE
- SHA-256
- 92fa6553260b490db3f09aa6752ef5dd35a226e067a39a2f1d3144ffa40aa935
- MD5
- 2b26431ffcaf78f490c028395212f002
- SHA-1
- 4c5b247ad2f5a28423a7e4506cdad704f9574ac2
- PE imphash
- f34d5f2d4577ed6d9ceec516c1f5a744
- First seen (VT)
- 6/12/2026, 8:20:33 PM
- Last analysis (VT)
- 6/13/2026, 10:12:53 AM
- First scan (MalwareTips)
- 6/13/2026, 10:59:37 AM
- Last scan (MalwareTips)
- 6/13/2026, 10:59:37 AM
Reviews & malware reports(0)
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