Attackers distributing FlawedAmmyy remote control rat trojan payloads through threat actor TA505 which is well known for distributing massive spam campaigns like Dridex banking Trojan, Locky ransomware, and Jaff ransomware.
Researchers from Proofpoint spotted the Email campaign and it was sent from spoofed email address subjected as “Receipt No 1234567” (random digits and first word could also be “Bill” or “Invoice”)” and matching attachments in the zip file.
The attached zip file contains .url files contains internet sites that launch default browser automatically, in this campaign attackers specified “file://” instead to HTTP://.
In a previous attempt on March 1 attackers distributed the FlawedAmmyy remote control rat trojan via office documents macros directly.
The FlawedAmmyy remote control rat trojan is based on the leaked source code of remote desktop support tool Ammyy Admin. FlawedAmmyy remote access trojan contains following functions
Attackers abused the leaked source code of Ammyadmin v3 and developed the malicious FlawedAmmyy that compromise your computer, steal customer data, proprietary information, and more.