PULSE NAME
Gootloader Returns: What Goodies Did They Bring?
WHITE PetrP.73 2025-11-06 Modified: 2025-12-06
146
IOCs
HIGH VOLUME
Gootloader, a JavaScript-based malware loader, has resurfaced with renewed activity after a brief hiatus. This malware is primarily used by the threat actor known as Storm-0494 to gain initial access, often leveraging SEO poisoning to attract users to compromised sites. Gootloader employs heavily obfuscated JavaScript to deliver additional payloads and is known for facilitating infections that lead to the deployment of various ransomware families, such as Rhysida, BlackCat, Zeppelin, and Quantum Locker through another actor, Vanilla Tempest. One of the novel techniques used in recent Gootloader operations includes the incorporation of custom WOFF2 fonts, which employ glyph substitution to obscure filenames. The loader exploits WordPress comment submission endpoints to deliver XOR-encrypted ZIP files containing payloads, with a unique decryption key hardcoded in the site’s source code.
MITRE ATT&CK & Malware Families
ATT&CK TECHNIQUES
MALWARE FAMILIES
Gootloader OysterLoader
Indicators of Compromise (10 / 146 total)
All URL FileHash-SHA256 domain hostname
TYPEINDICATORDESCRIPTIONCREATED
FileHash-SHA256 2f056ce0657542da3e7e43fb815a8973c354624043f19ef134dff271db1741b3 2025-11-06
FileHash-SHA256 39d980851be1e111c035e4db2589fa3d5f59a5bef7b7b3e36bff5435c78f7049 2025-11-06
FileHash-SHA256 5ec9e926d4fb4237cf297d0d920cf0e9a5409f0226ee555bd8c89b97a659f4b0 2025-11-06
FileHash-SHA256 7557d5fed880ee1e292aba464ffdc12021f9acbe0ee3a2313519ecd7f94ec5c4 2025-11-06
FileHash-SHA256 87cbe9a5e9da0dba04dbd8046b90dbd8ee531e99fd6b351eae1ae5df5aa67439 2025-11-06
FileHash-SHA256 ad88076fd75d80e963d07f03d7ae35d4e55bd49634baf92743eece19ec901e94 2025-11-06
FileHash-SHA256 b9a61652dffd2ab3ec3b7e95829759fc43665c27e9642d4b2d4d2f7287254034 2025-11-06
FileHash-SHA256 c2326db8acae0cf9c5fc734e01d6f6c1cd78473b27044955c5761ec7fd479964 2025-11-06
FileHash-SHA256 c2b9782c55f75bb1797cb4fbae0290b44d0fcad51bf4f2c11c52ebbe3526d2ac 2025-11-06
FileHash-SHA256 cf44aa11a17b3dad61cae715f4ea27c0cbf80732a1a7a1c530a5c9d3d183482a 2025-11-06