{"id":11776,"date":"2022-04-12T05:31:15","date_gmt":"2022-04-12T05:31:15","guid":{"rendered":"https:\/\/myonlinesecurity.co.uk\/?p=11776"},"modified":"2023-04-05T08:52:03","modified_gmt":"2023-04-05T08:52:03","slug":"random-invoice-or-bill-word-doc-macro-leads-to-unknown-malware","status":"publish","type":"page","link":"https:\/\/myonlinesecurity.co.uk\/random-invoice-or-bill-word-doc-macro-leads-to-unknown-malware\/","title":{"rendered":"Random Invoice Or Bill \u2013 Word Doc Macro Leads To Unknown Malware"},"content":{"rendered":"
An email with random invoice or bill subjects coming from random names and emails addresses with a malicious word doc attachment is another one from the current bot runs which try to download various Trojans and password stealers especially banking Trojans like Dridex or Dyreza and ransomware like Locky, cryptolocker or Teslacrypt.<\/p>\n
They are using email addresses and subjects that will scare or entice a user to read the email and open the attachment. A very high proportion are being targeted at small and medium size businesses, with the hope of getting a better response than they do from consumers.<\/p>\n
A high proportion of these are not getting caught by the spam or content filters because they pass SPF & DKIM authentication checks<\/p>\n
These have a load of different subjects that include:<\/p>\n
The email looks like:<\/p>\n
From:<\/strong> Reece Solis <acc@hai-van.com><\/p>\n Date:<\/strong> Thu 10\/03\/2021 04:58<\/p>\n Subject:<\/strong> Re: Important Notice About Created Invoice<\/p>\n Attachment:<\/strong> 4KEEY46Y.doc<\/p>\n Pls review the report attached.<\/em><\/p>\n Reece Solis<\/em><\/p>\n or<\/p>\n check the invoice attached.<\/em><\/p>\n Stuart Sweet<\/em><\/p>\n or<\/p>\n see the report in attachment.<\/em><\/p>\n Odysseus Mcm<\/em>illan<\/p>\n Screenshot:<\/strong>None<\/p>\n 10 March 2021: 4KEEY46Y.doc Current Virus total detections: [1] [2] [3] [4] MALWR [a] [b] shows downloads from http:\/\/hoosierpattern.com\/a1.jpg?Df1iQh0PABlsu=38 which is a jpg that contains embedded malware that is extracted via the macro & a dropped vbs file to give 339.exe ( VirusTotal) and autorun. There is some dispute over what the dropped malware actually is on the VT results, Automatic analysis is inconclusive probably due to anti-analysis protection where it crashes the MALWR online analyser MALWR reverseit [1] [2] Previous runs like this have dropped either Dridex banking Trojan or Locky ransomware.<\/p>\n Update: I am reliably informed that this is Dridex banking Trojan and an alternative download location is http:\/\/darrallmacqueen.com\/b2.jpg?JzKE5CmWJZnG=<\/p>\n The jpg it downloads looks like this ( screenshot to avoid risks)<\/p>\n Previous campaigns over the last few weeks have delivered 5 or 6 and quite often up to 10 or 12 different versions, some with word doc attachments and some with Excel xls attachments. There are frequently 5 or 6 download locations all delivering slightly different malware versions. Dridex \/Locky does update at frequent intervals during the day, sometimes as frequently as every hour, so you might get a different version of this nasty Ransomware or banking, password stealer Trojan.<\/p>\n All the alleged senders, companies, names of employees, phone numbers, amounts, reference numbers etc. mentioned in the emails are all innocent and are just picked at random. Some of these companies will exist and some won\u2019t. Don\u2019t try to respond by phone or email, all you will do is end up with an innocent person or company who have had their details spoofed and picked at random from a long list that the bad guys have previously found . The bad guys choose companies, Government departments and other organisations with subjects that are designed to entice you or alarm you into blindly opening the attachment or clicking the link in the email to see what is happening.<\/p>\n This email attachment contains what appears to be a genuine word doc or Excel XLS spreadsheet with either a macro script or an embedded OLE object that when run will infect you.<\/p>\n Modern versions of Microsoft office, that is Office 2010, 2013, 2016 and Office 365 should be automatically set to higher security to protect you.<\/p>\n By default protected view is enabled and macros are disabled, UNLESS you or your company have enabled them. If protected view mode is turned off and macros are enabled then opening this malicious word document will infect you, and simply previewing it in windows explorer or your email client might well be enough to infect you. Definitely DO NOT follow the advice they give to enable macros or enable editing to see the content.<\/p>\n Most of these malicious word documents either appear to be totally blank or look something like these images when opened in protected view mode, which should be the default in Office 2010, 2013, 2016 and 365. Some versions pretend to have a digital RSA key and say you need to enable editing and Macros to see the content. Do NOT enable Macros or editing under any circumstances.<\/p>\n <\/p>\n At this time, these malicious macros only infect windows computers. They do not affect a Mac, IPhone, IPad, Blackberry, Windows phone or Android phone.<\/p>\n The malicious word or excel file can open on any device with an office program installed, and potentially the macro will run on Windows or Mac or any other device with Microsoft Office installed. BUT the downloaded malware that the macro tries to download is windows specific, so will not harm, install or infect any other computer except a windows computer. You will not be infected if you do not have macros enabled in Excel or Word. These Macros do not run in \u201cOffice Online\u201d Open Office, Libre Office, Word Perfect or any other office program that can read Word or Excel files.<\/p>\nBody Content:<\/strong><\/h3>\n
What Can Be Infected By This<\/h3>\n