File scan report
Verdict Safe
Is tb_
Single less reliable engine flags an unsigned 12-year-old DLL whose sandbox activity maps to but lacks major corroboration.
Read the whole reasonShow less
Moderate evidence · No engine flags it, but no publisher signature confirms who made it.
The sample can be treated as safe for normal use; continue running up-to-date antivirus.
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
1 of 60 flagged
- Flagged 1
- No detection 59
- No result 15
- Code signing Unsigned
- Test run Completed
- First seen 16y ago
Chapter 02
Why we think so
2 points against it and 3 in its favour, checked against the scan evidence.
The reasoning behind this verdict
75 engines scanned the file; only Cynet (less reliable) returned a malicious label. No major detections, no signed publisher, and no external-intel hits exist.
The engine distribution shows a textbook less reliable-only pattern: 1 malicious out of 75 total, zero major flags, and only less reliable engines flagged it. The unsigned status and absence of signer history are neutral for a DLL of this age. Sandbox evidence of is noted but explicitly caveated by the rule itself as not proving intent. Medium prevalence over 18 submitters and zero external-intel matches further reduce the likelihood of active malice.
What We Detected
One less reliable engine (Cynet) assigned a generic malicious score; the remaining 74 engines, including all 17 major antivirus engines, remained silent or timed out. The file is an unsigned Win32 DLL first seen in 2010.
Threat Behavior
Sandbox execution mapped observed actions to MITRE T1055 (Process Injection) and recorded multiple WerFault and rundll32 command lines. No malicious files it created, no control-server domains, and no YARA or CIRCL hits were found.
What To Do Now
Keep Windows Defender and other security software enabled. If the DLL is required by a specific application, restrict its use to that application’s directory and monitor for unexpected programs it started.
- Zero malicious detections from major antivirus engines
- Medium prevalence over 12 years
- No external intelligence hits
- Unsigned DLL
- Sandbox mapped process-injection activity
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- 19sandbox rule tags
- 6spawned processes
- 0network contacts
- 40filesystem & mutex artifacts
Includes 19 mapped techniques, every process, file, registry and network entry and 6 dropped files.
Show the technical evidenceChapter 04
Technical details
1 of the 60 antivirus engines that checked it flags 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.
Engines that flagged it 1
The saved verdict treats these detections as likely false positives.
- CynetMalicious (score: 100)
File fingerprint
- Last analyzed
- Sep 5, 2026, 3:50 PM UTC
- SHA-256
a9273bc1267bc431971e9cebdf2b6c9b26ade011145dbe296705ecd7a8d3f74d- SHA-1
917ffc3a095c9b2a90c365c5b60a654da0f50c12- MD5
13f1ae330ff1e0fbb9b6eb6b4e6c2ddf
About this file
tb_grumblebum_2_7.dll is a Win32 DLL file of 2.2 MB.
- Type and size
- Win32 DLL · 2.2 MB
- Signer
- UnsignedNo code signature.
- First seen
- Aug 13, 2010On VirusTotal.
- Submitted by
- 18 distinct sources
- Packer
- None detected
- Entropy
- 6.35 of 8
First scanned
Includes every engine result (75), 1 matched signature rule, PE section entropy and packers and how widely the file has been seen.
Show the technical evidenceChapter 05
Questions & answers
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Community
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