Daily Archives: May 23, 2020

Experts observed a spike in COVID-19 related malspam emails containing GuLoader

Security experts observed a spike in the use of the GuLoader since March 2020 while investigating COVID-19-themed malspam campaigns.

Researchers from Vipre Labs observed a spike in the use of GuLoader in COVID-19-themed campaign since March 2020.

GuLoader

The discovery confirms that crooks continue to use COVID-19 lures in malspam campaigns. In the campaign monitored by Vipre Labs, attackers used spam email samples containing GuLoader.

The GuLoader is a popular RAT that appeared in the threat landscape in 2019 and that was involved in other COVID-19 campaigns, it is written in VB5/6 and compressed in a .rar/.iso file. 

GuLoader is usually employed in spam campaigns using bill payments, wire transfers or COVID lures.

In the last campaign observed by experts, the downloader utilizes cloud hosting services to keep the payload encrypted.

“This malware downloader utilizes cloud hosting services like Microsoft OneDrive or Google Drive to keep its payload encrypted. Also, GuLoader is used to download Remote Access Trojan (RAT) or files that allow attackers to control, monitor, or steal information on the infected machine.” reads the analysis.

The malware implements anti-analysis techniques, such as an anti-debugger. In order to achieve persistence, GuLoader creates a folder in which to place a copy of itself and modifies a registry key.

Now the loader implements process hollowing and use the child processes to download, decrypt, and map the payload into memory.

Common payloads downloaded by the loader are Formbook, NetWire, Remcos, Lokibot, and others.

The analysis published by Vipre Labs includes technical details about the threats, including Indicators of Compromise (IoCs).

In early March, experts at MalwareHunterTeam uncovered a COVID-19-themed campaign that was distributing the GuLoader malware to deliver the FormBook information-stealing Trojan.

The campaign was using emails that pretend to be sent by members of the World Health Organization (WHO).

Pierluigi Paganini

(SecurityAffairs – COVID-19, malspam)

The post Experts observed a spike in COVID-19 related malspam emails containing GuLoader appeared first on Security Affairs.

Voter information for 2 millions of Indonesians leaked online

A hacker has leaked the 2014 voter information for close to 2 million Indonesians on a well-known hacker forum and threatens to release 200 million.

A threat actor has published the 2014 voter information for close to 2 million Indonesians on a popular hacker forum and threatens to release data for a total of 200 million voters.

The dump includes voter records in individual PDF files that were allegedly stolen from the general election commission of Indonesia KPU.

According to intelligence firm Under the Breach, the PDFs were organized by Indonesia cities, threat actor leaks information on 2,300,000 Indonesian citizens. Leaked details include names, addresses, ID numbers, birth dates, and more, they appear to date back to 2013.

The KPU replied that the data was public information, it was available for anyone during the 2014 election. The KPU highlighted that its systems were not hacked.

Pierluigi Paganini

(SecurityAffairs – Indonesians, hacking)

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Silent Night Zeus botnet available for sale in underground forums

Experts reported the existence of a botnet, tracked as Silent Night based on the Zeus banking Trojan that is available for sale in several underground forums.

This week researchers from Malwarebytes and HYAS published a report that included technical details on a recently discovered botnet, tracked as Silent Night, being distributed via the RIG exploit kit and COVID-19 malspam campaign. 

Silent Night

The source code of the Zeus Trojan is available in the cybercrime underground since 2011 allowing crooks to develop their own release since.

Experts found multiple variants in the wild, many of them belonging to the Terdot Zbot/Zloader malware family.

The name “Silent Night” Zbot is likely a reference to a weapon mentioned in the 2002 movie xXx, it was first spotted in November 2019 when a seller named “Axe” started offering it on the Russian underground forum forum.exploit[.]in.

Axe was advertising the Trojan as the result of over five years of work, a total of 15k ~ hours were spent for the development of the malicious code.

“The author described it as a banking Trojan designed with compatibility with Zeus webinjects. Yet, he claims that the code is designed all by him, based on his multiple years of experience – quote: “In general, it took me 5+ years to develop and support the bot, on average about 15k ~ hours were spent.”.” reads the report published by the researchers.

The botnet goes for $4,000 per month for a custom build, $2,000 per month for a general build, while an extra for HVNC functionality is available for 1,000 USD/month and 14 days to test the code for 500 USD.

Experts believe that Axe is the developer of the Axe Bot 1.4.1, comparing Axe Bot 1.4.1 and Zloader 1.8.0 C2 source codes, experts noted that all of their custom PHP functions have the prefix CSR, which can either be a naming space or a developer’s handle

Silent Night is able to grab information from online forms and perform web injections in major browsers, including Google Chrome, Mozilla Firefox, and Internet Explorer, monitor keystrokes, take screenshots, harvest cookies and passwords.

Silent Night leverages web injections to hijack a user’s session and redirect them to malicious domains or to grab the login credentials for online banking services. Data collected by the malware are then transferred to the operator’s command-and-control (C2) server.

The malware is able to infect all operating systems.

The seller also claims to use an original obfuscator, the decryption is performed only “on demand.” The analysis of the content of an open directory on the Command and Control server allowed the researchers to discover a manual for bot operators that includes instructions for the set up of the malware.

On Dec 23 2019, this variant of Zloader was observed being distributed by the RIG Exploit Kit, experts observed small campaigns, likely for testing purposes. The spreading intensified over time, in March 2020, it was delivered in a COVID-19-themed spam campaign using weaponized Word documents.

“The design of Silent Night is consistent and clean, the author’s experience shows throughout the code. Yet, apart from the custom obfuscator, there is not much novelty in this product. The Silent Night is not any game changer, but just yet another banking Trojan based on Zeus.” concludes the report. “Based on the analysis of the bot’s configurations, we may confidently say that there is more than one customer of the “Silent Night”.”

Pierluigi Paganini

(SecurityAffairs – Silent Night, hacking)

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Riding the State Unemployment Fraud ‘Wave’

When a reliable method of scamming money out of people, companies or governments becomes widely known, underground forums and chat networks tend to light up with activity as more fraudsters pile on to claim their share. And that’s exactly what appears to be going on right now as multiple U.S. states struggle to combat a tsunami of phony Pandemic Unemployment Assistance (PUA) claims. Meanwhile, a number of U.S. states are possibly making it easier for crooks by leaking their citizens’ personal data from the very websites the unemployment scammers are using to file bogus claims.

Last week, the U.S. Secret Service warned of “massive fraud” against state unemployment insurance programs, noting that false filings from a well-organized Nigerian crime ring could end up costing the states and federal government hundreds of millions of dollars in losses.

Since then, various online crime forums and Telegram chat channels focused on financial fraud have been littered with posts from people selling tutorials on how to siphon unemployment insurance funds from different states.

Denizens of a Telegram chat channel newly rededicated to stealing state unemployment funds discussing cashout methods.

Yes, for roughly $50 worth of bitcoin, you too can quickly jump on the unemployment fraud “wave” and learn how to swindle unemployment insurance money from different states. The channel pictured above and others just like it are selling different “methods” for defrauding the states, complete with instructions on how best to avoid getting your phony request flagged as suspicious.

Although, at the rate people in these channels are “flexing” — bragging about their fraudulent earnings with screenshots of recent multiple unemployment insurance payment deposits being made daily — it appears some states aren’t doing a whole lot of fraud-flagging.

A still shot from a video a fraudster posted to a Telegram channel overrun with people engaged in unemployment insurance fraud shows multiple $800+ payments in one day from Massachusetts’ Department of Unemployment Assistance (DUA).

A federal fraud investigator who’s helping to trace the source of these crimes and who spoke with KrebsOnSecurity on condition of anonymity said many states have few controls in place to spot patterns in fraudulent filings, such as multiple payments going to the same bank accounts, or filings made for different people from the same Internet address.

In too many cases, he said, the deposits are going into accounts where the beneficiary name does not match the name on the bank account. Worse still, the source said, many states have dramatically pared back the amount of information required to successfully request an unemployment filing.

“The ones we’re seeing worst hit are the states that aren’t aren’t asking where you work,” the investigator said. “It used to be they’d have a whole list of questions about your previous employer, and you had to show you were trying to find work. But now because of the pandemic, there’s no such requirement. They’ve eliminated any controls they had at all, and now they’re just shoveling money out the door based on Social Security number, name, and a few other details that aren’t hard to find.”

CANARY IN THE GOLDMINE

Earlier this week, email security firm Agari detailed a fraud operation tied to a seasoned Nigerian cybercrime group it dubbed “Scattered Canary,” which has been busy of late bilking states and the federal government out of economic stimulus and unemployment payments. Agari said this group has been filing hundreds of successful claims, all effectively using the same email address.

“Scattered Canary uses Gmail ‘dot accounts’ to mass-create accounts on each target website,” Agari’s Patrick Peterson wrote. “Because Google ignores periods when interpreting Gmail addresses, Scattered Canary has been able to create dozens of accounts on state unemployment websites and the IRS website dedicated to processing CARES Act payments for non-tax filers (freefilefillableforms.com).”

Image: Agari.

Indeed, the very day the IRS unveiled its site for distributing CARES Act payments last month, KrebsOnSecurity warned that it was very likely to be abused by fraudsters to intercept stimulus payments from U.S. citizens, mainly because the only information required to submit a claim was name, date of birth, address and Social Security number.

Agari notes that since April 29, Scattered Canary has filed at least 174 fraudulent claims for unemployment with the state of Washington.

“Based on communications sent to Scattered Canary, these claims were eligible to receive up to $790 a week for a total of $20,540 over a maximum of 26 weeks,” Peterson wrote. “Additionally, the CARES Act includes $600 in Federal Pandemic Unemployment Compensation each week through July 31. This adds up to a maximum potential loss as a result of these fraudulent claims of $4.7 million.”

STATE WEB SITE WOES

A number of states have suffered security issues with the PUA websites that exposed personal details of citizens filing unemployment insurance claims. Perhaps the most galling example comes from Arkansas, whose site exposed the SSNs, bank account and routing numbers for some 30,000 applicants.

In that instance, The Arkansas Times alerted the state after hearing from a computer programmer who was filing for unemployment on the site and found he could see other applicants’ data simply by changing the site’s URL slightly. State officials reportedly ignored the programmer’s repeated attempts to get them to fix the issue, and when it was covered by the newspaper the state governor accused the person who found it of breaking the law.

Over the past week, several other states have discovered similar issues with their PUA application sites, including Colorado, Illinois, and Ohio.

The Florida Unemployment System suffered a data breach

Officials revealed that the Florida Unemployment System suffered a data breach that impacted some residents who have made unemployment claims.

The Florida Department of Economic Opportunity revealed that the Florida Unemployment System suffered a data breach that impacted some residents who have made unemployment claims.

It has notified 98 people that have been impacted by the incident, government representatives didn’t disclose when the breach took place either the number of the affected individuals and the type of information compromised.

The agency spokeswoman Paige Landrum announced that the breach was addressed within one hour after the officials became aware of it. The Florida Department of Economic Opportunity is offering tho the impacted citizens identity protection services for free.

Impacted users should be vigilant and report any unauthorized activity on their financial accounts.

“The DEO has received more than 2 million claims seeking unemployment benefits from Floridians since the coronavirus pandemic caused mass business closings around the state, though only 1.6 million claims have been verified.” reported the AP agency. “Just under 1 million jobless workers in Florida have been paid more than $2.6 billion in benefits.”

State Sen. Linda Stewart, D-Orlando, expressed concern about the response of the agency to the security breach and the measures it has adopted to prevent future incidents. Stewart sent a letter to Department of Management Services Secretary Jonathan Satter, whose office oversees information technology for other state agencies.

“Given the agency’s (DEO) track record with processing unemployment applications, I’m sure you will understand the great concern I have that all remedies have been quickly taken and that Floridians can be assured that their personal information is now secured and will be protected from future attacks,” Stewart wrote.

The good is that the Florida Department of Economic Opportunity is not aware of malicious activity abusing exposed data.

Pierluigi Paganini

(SecurityAffairs – Florida, hacking)

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