Kimsuky Attack Disguised as Sex Offender Notification

2025-09-22 Logpresso

https://logpresso.com/en/blog/2025-09-22-kimsuky-attack

Thumbnail for Kimsuky Attack Disguised as Sex Offender Notification

Logpresso attributes a late-July 2025 campaign to Kimsuky that used compressed archives with sex-offender and tax-notice themes to deliver deceptive Windows shortcut files. When opened, the LNK chain runs mshta.exe to retrieve HTA and log files, shows a decoy password file, decrypts an AES-protected ZIP payload, and launches PowerShell and script stages. The malware collects system details, browser data, cryptocurrency wallet extensions, Telegram sessions, NPKI/GPKI certificates, recent documents, keyword-matched files, keystrokes, and clipboard content before encrypting and exfiltrating data. Its C2 at mailhubsec.com subdomains supports file upload, file download, PowerShell command execution, and DLL execution commands, with beaconing every ten minutes and 4 MB encrypted upload chunks. Additional loader activity uses RC4-decrypted payloads and reflective DLL injection into Chrome and Edge processes, expanding the post-infection capability set.

Indicators of Compromise

Type Value First Seen Last Seen
HASH 1a2164d9fea343bd5a5fc31a0849bb6e 2025-09-18 2026-01-14
HASH 03794685a12ce0dd7b69e70ced8568f9 2025-09-18 2026-01-14
HASH 092c2607c9f60360bac8eb22059ac51… 2025-09-18 2026-01-14
HASH 206f30e074f46df4f6f18824c09b8b8… 2025-09-18 2026-01-14
HASH 373fce7c6fa68ad9afa22bcbf8c15f5d 2025-09-18 2026-01-14
HASH 1b1431e7f18038103235558d4461bb3… 2025-09-18 2026-01-14
HASH 941ac1e6728aab61a303e0f8e7ef815… 2025-09-18 2026-01-14
HASH 345de053580a242fe9559b2c4e6f5b5… 2025-09-18 2026-01-14
HASH cecfa6dce05f3a71923fd0ffa6e1ef4… 2025-09-18 2026-01-14
HASH ff188b008bed743a8e899b0d69a4e1d… 2025-09-18 2026-01-14
HASH d4a63c97ade3bcca8913f50bc1b130f… 2025-09-18 2026-01-14
HASH 6730d86c8e24e0c2ae0bb1fb65d15b5… 2025-09-18 2026-01-14
HASH 1f34b194259beb09bd8812313880aa3… 2025-09-18 2026-01-14
HASH 64b48a4b186301cd18045126cf87343… 2025-09-18 2026-01-14
HASH 677e77265c7ba52e825fc62023942213 2025-09-18 2026-01-14
HASH 748b45f59a2b02f41d001f2d71dea9a… 2025-09-18 2026-01-14
HASH 1d01eab612da7d635e6b92395ead126… 2025-09-18 2026-01-14
HASH 0ff0ca772477fe4558bd75c1471b9e9… 2025-09-18 2026-01-14
HASH 6d9854b69ce9cdee79b723bc7632eeb… 2025-09-18 2026-01-14
HASH c24353e61826eb7187d1acabbd857dd… 2025-09-18 2026-01-14
HASH 746249913d1f6e944fe1a70ea1b3684… 2025-09-18 2026-01-14
HASH 4739393bd6dd1d938dc1dc3ee7e9e06… 2025-09-18 2026-01-14
HASH 7a1577516f7b8c45c92f65bb458c9e4… 2025-09-18 2026-01-14
HASH cb9c24ee556d0aabdcaaedbcd5dd8e6… 2025-09-18 2026-01-14
URL https://yajxu.mailhubsec.com/ 2025-09-18 2026-01-14
DOMAIN yajxu.mailhubsec.com 2025-09-18 2026-01-14
DOMAIN yfews.mailhubsec.com 2025-09-18 2026-01-14
IPv4 142.11.248.98 2025-09-18 2026-01-14
URL https://yfews.mailhubsec.com/co… 2025-09-18 2025-09-22

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