Security intelligence from Mandiant has discovered a spear-phishing campaign, launched by the Russia-linked APT29 group, designed to victimize diplomats and government entities worldwide including European, the Americas, and Asia.
The group is believed to be sponsored by the Russian Foreign Intelligence Service (SVR) and to have orchestrated the 2020 SolarWinds attack which hit hundreds of organizations.
According to the data, the Russia-linked APT29 group popularly known as SVR, Cozy Bear, and The Dukes is active since at least 2014, along with the APT28 cyber threat group which was involved in the Democratic National Committee hack, the wave of attacks aimed at the 2016 US Presidential Elections and a November 2018 attempt to infiltrate DNC.
The phishing emails have been masqueraded as official notices related to various embassies. Nation-state actors used Atlassian Trello, DropBox, and cloud services, as part of their command and control (C2) infrastructure.
“APT29 targeted large lists of recipients that Mandiant suspected were primarily publicly-listed points of contact of embassy personnel. These phishing emails utilized a malicious HTML dropper tracked as ROOTSAW, which makes use of a technique known as HTML smuggling to deliver an IMG or ISO file to a victim system.” reads the analysis published by Mandiant.
The threat actors used the HTML smuggling technique to deliver an IMG or ISO file to the targets. The ISO image contains a Windows shortcut file (LNK) that installs a malicious DLL file when it is clicked. When the attachment file opens, the ROOTSAW HTML dropper will write an IMG or ISO file to disk. Following the steps, once the DLL file is executed, the BEATDROP downloader is delivered and installed in memory.
“BEATDROP is a downloader written in C that makes use of Trello for C2. Once executed, BEATDROP first maps its own copy of ntdll.dll into memory for the purpose of executing shellcode in its own process. BEATDROP first creates a suspended thread with RtlCreateUserThread which points to NtCreateFile...”
“…Following this, BEATDROP will enumerate the system for the username, computer name, and IP address. This information is used to create a victim ID, which is used by BEATDROP to store and retrieve victim payloads from its C2. Once the victim ID is created, BEATDROP will make an initial request to Trello to identify whether the current victim has already been compromised”, the report read.
