Did you just run into a download or a file on your computer that is digitally signed by Blue Bulletin? Some of the security products refers to the detected files as Adware.SwiftBrowse.CH and Trojan.Win32.Generic!BT. The detection rate for the Blue Bulletin files collected here is 49%. Please read on for more details.
You will probably notice Blue Bulletin when double-clicking to run the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can also view the Blue Bulletin certificate with the following steps:
Here's a screenshot of a file digitally signed by Blue Bulletin:

As you can see in the screencap above, Windows reports that "This digital signature is OK". This implies that the file has been published by Blue Bulletin and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also view the address for Blue Bulletin, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Blue Bulletin certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Blue Bulletin files I've collected, thanks to the FreeFixer users.
Here is the detection names for the Blue Bulletin files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| ALYac | Adware.SwiftBrowse.CH |
| AVG | AdPlugin.DAI |
| AVware | Trojan.Win32.Generic!BT |
| Ad-Aware | Adware.SwiftBrowse.CH |
| Agnitum | Riskware.Agent! |
| AhnLab-V3 | PUP/Win32.SwiftBrowse |
| Antiy-AVL | GrayWare[NetTool:not-a-virus]/Win64.NetFilter.a |
| Arcabit | Adware.SwiftBrowse.CH |
| Baidu-International | Adware.Win32.BrowseFox.SaCl |
| BitDefender | Adware.SwiftBrowse.CH |
| Bkav | W64.HfsAdware.729E |
| ClamAV | Win.Adware.Swiftbrowse-497 |
| Cyren | W64/A-59c9c70a!Eldorado |
| DrWeb | Trojan.Yontoo.2127 |
| ESET-NOD32 | a variant of Win64/NetFilter.A potentially unsafe |
| Emsisoft | Adware.SwiftBrowse.CH (B) |
| F-Prot | W64/A-59c9c70a!Eldorado |
| F-Secure | Adware.SwiftBrowse.CH |
| Fortinet | Riskware/NetFilter |
| GData | Adware.SwiftBrowse.CH |
| K7AntiVirus | Adware ( 0040f9f21 ) |
| K7GW | Adware ( 0040f9f21 ) |
| Kaspersky | not-a-virus:NetTool.Win64.NetFilter.k |
| McAfee | Artemis!EC1B00CCED96 |
| McAfee-GW-Edition | BehavesLike.Win64.PUPAmonetize.ph |
| MicroWorld-eScan | Adware.SwiftBrowse.CH |
| Panda | Generic Suspicious |
| Qihoo-360 | Win32/Virus.NetTool.094 |
| SUPERAntiSpyware | Adware.SwiftBrowse/Variant |
| Tencent | Win64.Adware.Bp-sys.Zuxl |
| VIPRE | Trojan.Win32.Generic!BT |
| Zillya | Adware.Yotoon.Win64.14 |
| nProtect | Trojan-Clicker/W32.Yotoon.48784 |
The detection percentage is based on the fact that I've collected 841 scan reports for the Blue Bulletin files. 413 of these scan results came up with some sort of detection. If you like, you can view the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: