PULSE NAME
Lazarus Group Enhances Malware with New OtterCookie Payload Delivery Technique.
WHITE PetrP.73 2025-08-02 Modified: 2025-09-01
39
IOCs
MEDIUM VOLUME
The Contagious Interview campaign, attributed to the Lazarus Group, has demonstrated significant evolution in its operational techniques, particularly in the delivery mechanisms for its primary payloads: BeaverTail, InvisibleFerret, and OtterCookie. Recent analysis reveals that the group has adopted innovative methodologies to obfuscate their malicious code, making it more challenging for automated detection tools to identify their activities. One notable tactic employed by the Lazarus Group involves fragmenting URLs within the code. This method hides the command and control (C2) infrastructure by using legitimate hosting platforms, specifically http://Vercel.App, to deliver malicious payloads disguised as innocuous favicon content. The mechanism involves a call to a "doing" constant, which initiates a request operation to the C2 server.
MITRE ATT&CK & Malware Families
ATT&CK TECHNIQUES
Indicators of Compromise (1 / 39 total)
All FileHash-MD5 FileHash-SHA256 domain URL
TYPEINDICATORDESCRIPTIONCREATED
FileHash-MD5 56e15ef3b5e5f169fc063f8d3e88288e 2025-08-02