Suspicious
Unsigned installer with process-injection heuristic and low-trust flagging; RAG shows borderline history; runtime clean but obfuscated code warrants caution.
fc8aea51a7caeebc7c…18160f82afThe 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.
The file exhibits a borderline profile: a single low-trust detection with a generic heuristic label, no tier-1 consensus, and an unsigned status. The process-injection technique (T1055) is flagged by our heuristic engine, but this is common in installers and system tools. The behaviour sandbox recorded no malicious verdicts, no contacted malicious hosts, and no dropped children — all clean indicators. The RAG history shows 3 prior files with the same imphash verdicted 'suspicious' (not malicious), suggesting this imphash family is known but not confirmed malware. High entropy and packing are present, but these are also typical of legitimate compressed installers. The rare-new prevalence and lack of external-intel hits (YARA, CIRCL) prevent confident malicious classification.
Each signal cites a concrete token from the evidence the arbiter saw — engine name, MITRE technique, signer string, or an exact count.
MaxSecure (low-trust) flagged 'Trojan.Malware.300983.susgen' — generic heuristic label, no tier-1 consensus; 10/17 tier-1 engines silent.
signing.verified=false, unsigned, no signer history — installer lacks code-signing credentials typical of commercial software.
similarHashes: 3/5 prior imphash matches verdicted 'suspicious' (ai:borderline_mixed_signals); no tier-1 malicious consensus in RAG.
behaviour: T1055 + T1562.001 offensive techniques present, but 19 ambient techniques (system discovery, process enumeration) and zero malicious sandbox verdict, zero malicious host contact — installer-like runtime profile.
prevalence.classification=rare_new, high entropy (7.66), likelyPacked=true — new sample with obfuscation, but no external-intel hits (yaraify=0, CIRCL=no), no dropped malicious children.
- Tier-1 engines silent — 10/17 tier-1 engines reported clean or timed out
- No malicious sandbox verdict — runtime behaviour clean
- No malicious host contact — no C2 or exfiltration observed
- No dropped malicious children — no secondary payload confirmed
- RAG history mixed but not malicious — 3 'suspicious', 1 'unknown', 1 'safe' on same imphash
- Unsigned executable — no code-signing credentials
- High code entropy (7.66) and likely packing — obfuscation present
- Process-injection technique (T1055) detected — could indicate payload smuggling or legitimate installer DLL loading
- Rare-new prevalence — only 1 submission, 0 days old
- Low-trust heuristic flagging — generic label, no tier-1 consensus
Treat this file as suspicious pending further investigation. Do not execute on production systems without additional verification of source and purpose. If the publisher is known and trusted, request signed release; if origin is uncertain, isolate and monitor or request dynamic analysis from a trusted security vendor.
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\86c65e3b-6047-402e-a572-84fa4658c77a
- C:\ProgramData\Microsoft\Windows\WER\ReportQueue
- C:\ProgramData\Microsoft\Windows\WER\Temp\c5d9ddf5-bad0-4a35-a7f8-b2869fcad29c
- 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_6.0.4.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
Barely seen in the wild and first surfaced recently. This is the footprint of targeted malware the AV industry hasn't signatured yet — extra scrutiny is warranted.
Forensic fingerprint
- File name
- PolarInstaller.exe
- Size
- 9.56 MB
- MIME type
- (unknown)
- Detected type
- Win32 EXE
- SHA-256
- fc8aea51a7caeebc7c3879537e900b3d81a626bd96bca9d2ceeba918160f82af
- MD5
- cdbb2fb8e7e338f4b88acad74dfa45a3
- SHA-1
- d1acb44a5ceeca95c4db1ec6c9da115c9914cfb9
- PE imphash
- f34d5f2d4577ed6d9ceec516c1f5a744
- First seen (VT)
- 6/13/2026, 12:03:23 PM
- Last analysis (VT)
- 6/13/2026, 12:03:23 PM
- First scan (MalwareTips)
- 6/13/2026, 12:52:18 PM
- Last scan (MalwareTips)
- 6/13/2026, 12:53:22 PM
Reviews & malware reports(0)
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