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
What this file did when executed
This file was run in a sandbox and its runtime behaviour was observed.
Techniques observed in the sandbox
19MITRE ATT&CK techniques the sandbox mapped. Highlighted ones are rare in normal software; the others are common in legitimate programs too.
- T1012
- T1027· Obfuscated code
- T1036
- T1055· Process injection
- T1056· Keylogging
- T1056.001· Keylogging
- T1057· Lists programs
- T1059· Runs commands
- T1071· Application protocol
- T1082· System recon
- T1083· Scans your files
- T1112
- T1113
- T1129· Loads modules
- T1218.011
- T1497· Sandbox evasion
- T1518.001· Checks your AV
- T1574.002· Execution hijack
- T1614
Observed activity
Processes started
6Programs the file ran, with their command lines.
rundll32.exe"C:\Windows\System32\rundll32.exe" "C:\Users\<USER>\Desktop\library.dll",#1loaddll32.exeC:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\readme.dll"cmd.exeC:\Windows\SysWOW64\cmd.exe cmd.exe /C rundll32.exe "C:\Users\user\Desktop\readme.dll",#1rundll32.exeC:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\readme.dll",#1rundll32.exeC:\Windows\SysWOW64\rundll32.exe rundll32.exe C:\Users\user\Desktop\readme.dll,mainrundll32.exeC:\Windows\SysWOW64\rundll32.exe rundll32.exe "C:\Users\user\Desktop\readme.dll",main
Files
30Files the file created, changed or deleted.
- Written
C:\ProgramData\Microsoft\Windows\WER\Temp - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\0357c3fa-64a0-4008-87f1-d5a89ee2114f - Written
C:\ProgramData\Microsoft\Windows\WER\ReportQueue - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\cbd6214e-5607-4389-a36c-2bb76d8fbede - Written
C:\ProgramData\Microsoft\Windows\WER\ReportArchive - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\ddd2d5b4-3389-4977-82d2-71f5e9c947d2
Show all 30 entries for files
- Written
C:\ProgramData\Microsoft\Windows\WER\Temp\b2edbceb-f3c5-4407-bf65-460694e567f2 - Written
C:\ProgramData\Microsoft\Windows\WER\ReportArchive\ea2c5bb4-44ca-43ce-8046-ce26cb800039 - Written
C:\ProgramData\Microsoft\Windows\WER\ReportQueue\dcb18efd-6cc0-4f2a-9931-be4e74074438 - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4694.tmp.dmp - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4889.tmp.WERInternalMetadata.xml - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WER49F2.tmp.xml - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCB95.tmp - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCB95.tmp.dmp - Written
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC31.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4694.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4889.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER49F2.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4694.tmp.dmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER4889.tmp.WERInternalMetadata.xml - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WER49F2.tmp.xml - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCB95.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCB95.tmp.dmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC31.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC31.tmp.dmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCC80.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCD0E.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCD1D.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERCD5C.tmp - Deleted
C:\ProgramData\Microsoft\Windows\WER\Temp\WERD653.tmp
Registry and auto-start
4Settings the file changed, including ways to start again after a restart.
- Deleted
\REGISTRY\A\{38102c08-f8a2-285d-14d8-45e4f4e6c9c1}\Root\InventoryApplicationFile\PermissionsCheckTestKey - Deleted
\REGISTRY\A\{c35990ba-4f7b-7bf9-88e3-678f79017e5c}\Root\InventoryApplicationFile\PermissionsCheckTestKey - Deleted
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\{11517B7C-E79D-4e20-961B-75A811715ADD} - Deleted
\REGISTRY\A\{8f8e51e2-d514-1293-39d9-990dee780ca0}\Root\InventoryApplicationFile\PermissionsCheckTestKey
Mutexes
10Named locks a program uses so only one copy runs; malware families often reuse them.
Local\WERReportingForProcess8Global\AmiProviderMutex_InventoryApplicationFileGlobal\63b47a17-df60-4676-bf86-95a21dcd23c3\Sessions\1\BaseNamedObjects\Local\WERReportingForProcess7796\Sessions\1\BaseNamedObjects\Global\8901c014-dbef-4035-9e41-eadfec324298\Sessions\1\BaseNamedObjects\Local\WERReportingForProcess7816
Show all 10 entries for mutexes
\Sessions\1\BaseNamedObjects\Global\AmiProviderMutex_InventoryApplicationFile\Sessions\1\BaseNamedObjects\Global\5044a825-362c-4300-b390-79d4a7dd8b9d\Sessions\1\BaseNamedObjects\Local\WERReportingForProcess3896\Sessions\1\BaseNamedObjects\Global\e4d5fb19-2497-4de3-8731-f50f7020a500
Sandbox background — not the file
5The analysis machine's own processes and connections, recorded in every run.
- VM process
WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 8 -s 748 - VM process
conhost.exeC:\Windows\System32\conhost.exe C:\Windows\system32\conhost.exe 0xffffffff -ForceV1 - VM process
WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 7796 -s 724 - VM process
WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 7816 -s 708 - VM process
WerFault.exeC:\Windows\SysWOW64\WerFault.exe -u -p 3896 -s 716
Files this sample writes at runtime
This file drops 6 children at runtime. None are currently flagged malicious in our cache. 6 have no saved verdict and were not checked; that is missing coverage, not a finding.
- 6235bdfc16771d573217…549785Not checkedno saved verdict
- 964eac20d1bad4bf9fed…f21eafNot checkedno saved verdict
- 0f22adb8c5237dcdfc69…348745Not checkedno saved verdict
- 4cde22dff8956aea8473…4c3eb2Not checkedno saved verdict
- 2c5854555762226c3250…2a8b4dNot checkedno saved verdict
- 91e0e31ded8364eb0a6e…278f07Not checkedno saved verdict
Chapter 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
Antivirus consensus
1 of 60 engines flagged this file
15 of the 75 engines returned no result for this file (file type not supported, or the scan did not finish), so they did not check it.
- Tier-113 engines0flagged
- Tier-230 engines0flagged
- Low-trust17 engines1flagged
View all 75 engine results
- CynetMalicious: Malicious (score: 100)
- AcronisClean
- AhnLab-V3Clean
- AlibabaClean
- alibabacloudClean
- ALYacNo result
- Antiy-AVLClean
- APEXClean
- ArcabitNo result
- AvastClean
- Avast-MobileNo result
- AVGClean
- AviraClean
- BitDefenderNo result
- BitDefenderFalxNo result
- BkavClean
- CAT-QuickHealClean
- ClamAVNo result
- CMCClean
- CrowdStrikeClean
- CTXNo result
- CylanceClean
- DeepInstinctNo result
- DrWebClean
- ElasticClean
- EmsisoftClean
- ESET-NOD32Clean
- F-SecureClean
- FortinetClean
- GDataNo result
- GoogleClean
- GridinsoftClean
- huorongClean
- IkarusNo result
- JiangminClean
- K7AntiVirusClean
- K7GWClean
- KasperskyClean
- KingsoftClean
- LionicClean
- MalwarebytesClean
- MaxSecureClean
- McAfeeDClean
- MicrosoftClean
- MicroWorld-eScanClean
- NANO-AntivirusClean
- PaloaltoClean
- PandaClean
- RisingClean
- SangforClean
- SentinelOneClean
- SkyhighClean
- SophosNo result
- SUPERAntiSpywareClean
- SymantecClean
- SymantecMobileInsightNo result
- TACHYONClean
- tehtrisClean
- TencentClean
- TrapmineClean
- TrellixENSClean
- TrendMicroNo result
- TrendMicro-HouseCallClean
- TrustlookNo result
- VaristClean
- VBA32Clean
- VIPRENo result
- VirITClean
- ViRobotClean
- WebrootClean
- XcitiumClean
- YandexClean
- ZillyaClean
- ZoneAlarmClean
- ZonerClean
Signatures and behavior heuristics
Low-severity pattern matches — worth noting but not on their own cause for alarm.
VirusTotal's sandbox summary maps this run to MITRE T1055 (Process Injection), but no injected process of the sample's own was recorded (the analysis VM's own WMI adapter, crash handlers and Chrome updater are not counted). VirusTotal maps T1055 on about half of all files no engine flags, so the mapping alone is not evidence of injection.
EvidenceT1055 (sandbox MITRE mapping)
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.
Chapter 05
Questions & answers
Short answers to the 6 questions people ask most about this file.
Is tb_grumblebum_2_7.dll safe?
What is tb_grumblebum_2_7.dll?
How many antivirus engines detected tb_grumblebum_2_7.dll?
What is the SHA-256 hash of tb_grumblebum_2_7.dll?
Is it safe to use tb_grumblebum_2_7.dll?
How up to date is this analysis of tb_grumblebum_2_7.dll?
Community
Member reviews and reports for this exact file hash.