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Infoblox Threat Intel artwork for The Ultra Trail, showing a glowing path linking a laptop running UltraViewer to UltraMailer, phishing campaign and QuickBooks warning signs.
Image: Infoblox Threat Intel (fair use).

Threat Intel

Infoblox Ties a QuickBooks Callback Scam on More Than 350 Lookalike Domains to UltraMailer's Default Tracker, Then Finds Trojanized UltraMailer and UltraViewer Installers Carrying Remote Access Trojans

The trail began with a tech-support scammer pushing UltraViewer, a remote access tool Infoblox sees on up to 30% of its customer networks on some days. Every phishing email fired a pixel at track.chanret[.]com with the recipient's address base64-encoded in the path, and one trojanized UltraMailer installer carried njRAT.

Priya Shah, Threat IntelSingapore4 min read

SINGAPORE - A tech-support scammer who told an Infoblox researcher to install the remote access tool UltraViewer set off an investigation that ended with a QuickBooks callback phishing operation on more than 350 lookalike domains and trojanized copies of two popular utilities carrying remote access trojans, Infoblox Threat Intel said Thursday.

The research ties the pieces together through DNS and email telemetry. Infoblox said it found no evidence that the developers of UltraViewer or its sister product, the bulk-mailing application UltraMailer, took part in the scams or distributed the malware. Its point is that widely available, low-cost software has become working infrastructure for criminals, and that defenders are left to tell normal use from abuse.

From a support scam to a tracking pixel

Infoblox said it first met UltraViewer during its earlier investigation of the Help TDS scam network, when a fake Microsoft support agent urged its researchers to download it. Registration records for ultraviewer[.]net led to other domains registered with the same email address, including ultramailer[.]org, which hosts UltraMailer, and chanret[.]com.

Infoblox trail map of its investigation from UltraViewer to UltraMailer, the QuickBooks phishing campaign and trojanized installers.
Image: Infoblox Threat Intel (fair use).Figure 2 in the report, the investigation's trail map.

Searching its spam collection for chanret[.]com, Infoblox found a phishing campaign impersonating QuickBooks support. The actor controls more than 350 QuickBooks lookalike domains, most registered with Dynadot in a single week, June 29 to July 5, 2026. Each email carries a 1x1 tracking pixel that fires a GET request to track.chanret[.]com when the message is opened. The URL path holds a campaign directory, which Infoblox believes maps to an UltraMailer customer or send batch, and the recipient's email address, base64-encoded as the image filename. Infoblox said chanret[.]com is UltraMailer's default tracking domain, which means the QuickBooks scammers use UltraMailer and that their open-tracking data passes through it.

Truncated QuickBooks-themed phishing email from the campaign, which embedded the chanret tracking pixel.
Image: Infoblox Threat Intel (fair use).Figure 1, a truncated phishing email from the QuickBooks campaign.

The emails tell recipients to call a supposedly toll-free number. The numbers Infoblox observed used the 805 area code, including +1 (805) 835-8090 and +1 (805) 699-1139, and the people on the other end try to steal QuickBooks credentials.

One provider acted, the other has no abuse channel

In August 2026 the actor moved its tracker to smtracking[.]qbcares[.]com, a CNAME pointing to smtracking[.]healthclub951[.]swp23[.]com. Infoblox attributes swp23[.]com to another bulk-mailing service, Mail250. Infoblox reported the account through Mail250's abuse system on Aug. 25; Mail250 said it suspended the user, and Infoblox verified the campaign stopped. On Sept. 8 the actor went back to chanret[.]com and resumed. Infoblox said UltraMailer's website has no abuse reporting mechanism.

UltraMailer documentation showing how to set up a tracking subdomain that still reports to track.chanret.com.
Image: Infoblox Threat Intel (fair use).Figure 3, UltraMailer's tracking-domain setup instructions.

UltraMailer's own documentation describes swapping in a private tracking domain, telling users that "when your domain is listed in blacklist, you can also change it again and every email will go to inbox again." Infoblox said tracking data still flows to track[.]chanret[.]com after users follow those steps, and it found forum posts advertising UltraMailer as a spamming tool on clearnet forums including sinister[.]li and patched[.]to, on BreachForums and on several Russian-language dark web platforms.

Trojanized installers

Infoblox then found a trojanized UltraMailer installer, UltraMailer_setup_v3.6_en.exe (SHA-256 9e1a679ca45a149d2bd681cbb8ec3b1cc3d271fad51b092a3db5e5642eb6676b), with an embedded njRAT payload; 45 of 75 VirusTotal engines flagged it at the time of analysis. The installer is unsigned but wraps an authentic copy of UltraMailer signed with a DUC FABULOUS CO.,LTD Sectigo certificate.

A second sample, UltraViewer_setup_6.6.133_vi.exe (SHA-256 28f046d9f985e58cbc8b245b54d4179feacecc12f41e2f6594306867ce3e8727), was submitted to VirusTotal on Sept. 4, 2026, flagged by 60 of 76 engines and attributed to the Win32.Comet.A family. It installs itself as C:\ProgramData\Synaptics\Synaptics.exe, impersonating the Synaptics touchpad driver, and like the first sample it is unsigned but bundles a validly signed UltraViewer.

Both product websites list a contact in Vietnam under the DUC FABULOUS name. Infoblox noted that Hexastrike has linked DUC FABULOUS CO.,LTD certificates to activity it attributes to the Chinese actor it calls Silver Fox, describing a stolen code-signing certificate, but Infoblox said it could not independently corroborate that the private key was stolen or compromised.

What defenders can do with it

UltraViewer is common. Infoblox said that on some days it sees connections to the tool's primary domain from as many as 30 percent of its customers, and it recommended that organizations without a business need for the software restrict it. For SOC teams, the report supplies concrete pivots: DNS lookups or image requests to track.chanret[.]com and the qbcares and swp23 tracking hosts from mail clients, QuickBooks-themed messages directing users to 805 numbers, the two installer hashes, a Synaptics.exe running from C:\ProgramData\Synaptics, and UltraViewer sessions that begin shortly after a user receives a support call. Infoblox listed both installer hashes as indicators at the end of its report.

Sources:


Priya Shah covers threat intelligence, intrusion analysis, and adversary tradecraft for SOCtember from Singapore.

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