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Jul 29, 2021
UPDATE: PetitPotam NTLM Relay Attack
THE THREAT PetitPotam is a variant of the NTLM Relay attack discovered by security researcher Gilles Lionel. It is tracked as an authentication bypass vulnerability in Active Directory (Certificate Services); currently no CVE identifier has been assigned to this vulnerability. Proof of Concept (PoC) code released last week [1] relies on the Encrypting File System Remote (EFSRPC) protocol to…
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Sydney, 12 July, 2021 - Tecala, Australia’s award-winning technology services and IT consulting provider, today announced it has chosen eSentire, the global Authority in Managed Detection and Response (MDR) cybersecurity services, as their exclusive MDR solution provider in Australia and New Zealand. This partnership will enable Tecala to augment its cybersecurity practice and offer enterprises…
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Security advisories — Feb 26, 2019

Malicious .SLK Files

1 min read

External sources have identified the limited use of maliciously crafted Symbolic Link files (.SLK) in phishing campaigns. Spreadsheet applications are used to launch and execute the malicious PowerShell command contained inside. This infection vector does not require the use of macros, making standard detection less likely.

At this time, .SLK files do not appear to be commonly incorporated into phishing campaigns. There is a Medium confidence rating that this delivery method will be widely adopted by threat actors in the near future.

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Additional information

Symbolic Link files using the “.SLK” file extension are used to transfer data between spreadsheets and other databases. These files are primarily used by Microsoft Office but are also recognized by other products in Windows, Mac, Linux, iOS and Android [1].

Protected view does not appear to be an option when opening .SLK files directly. Fortunately, there are multiple security notifications before a malicious .SLK file can be executed; the end user must agree to at least three separate prompts. These prompts limit the likelihood of success but do not eliminate the chance that a user may unwittingly permit the malicious activity.

[1] https://fileinfo.com/extension/slk