Kimsuky组织利用Dropbox云端实施行动分析

2024-01-30 Sangfor Kimsuky organization leverages Dropbox cloud for operational analytics

https://mp.weixin.qq.com/s?__biz=Mzg2NjgzNjA5NQ==&mid=2247522061&idx=1&sn=22e56ee213d9e5229371ad3e082ebfab&chksm=ce461c1df931950b245134a250b6bf4bea489d75b556cb450548569c0c6d50d3bacc00a8efe0&scene=178&cur_album_id=2867627575890837505#rd

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Sangfor links this Kimsuky activity to malicious LNK files disguised as Korean PDF or HWP documents for targets in cryptocurrency, government, diplomacy, media, and North Korea policy circles. One lure posed as a Korean cryptocurrency trading lecture and used PowerShell to pull ps.bin from Dropbox, which then loaded r_enc.bin and a TutClient remote-control component. The chain wrote a VBS stage under the Windows Templates directory, fetched a decoy PDF from hyojadong.kr, created scheduled tasks, and downloaded later PowerShell payloads. The operation used Dropbox for both staging and exfiltration, including scripts that collected host and file information and uploaded the results through Dropbox APIs.

Indicators of Compromise

Type Value First Seen Last Seen
HASH 0040f03faf5bbdc555f2039a4e33a82b 2024-01-30 2024-06-12
HASH 3e3013fe03f7416b8d1e96591f8e5839 2024-01-30 2024-04-17
HASH fcdcc6c56ae43f7a78413cc5204e9314 2024-01-30 2024-04-17
HASH 32519b46b55792084240f850e0c94298 2024-01-30 2024-04-17
DOMAIN gbionet.com 2024-01-30 2024-04-17
IPv4 122.155.191.33 2024-01-30 2024-04-17
HASH dce864eabfbd6445682a4671a2fee1a9 2023-12-29 2024-04-17
HASH befa4094eb7ceb31be76ec98b11353b… 2024-01-30 2024-03-28
URL https://hyojadong.kr/js/slick/d… 2024-01-30 2024-03-28
DOMAIN hyojadong.kr 2024-01-30 2024-03-28
HASH 617a4a83e7fb10a4a9ef993cdfe4d83… 2024-01-30 2024-01-30
URL http://gbionet.com/ 2024-01-30 2024-01-30
HASH 9fa12b629ca431ebc3aa56da2d7a784a 2023-09-26 2024-01-30

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