Kerrdown

MITRE ATT&CK: S0585 View on attack.mitre.org

Aliases: Kerrdown

First seen
2018-01-01 00:00:00
Malware type
downloader, spyware
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 12:41:34

Targeted industries: government-and-public-sector energy-and-utilities technology-and-telecommunications media-and-entertainment

Targeted regions: country_code:vn country_code:th country_code:ph country_code:kh country_code:id

Context

Kerrdown is a custom downloader that has been used by APT32 since at least 2018 to install spyware from a server on the victim's network.

Detection coverage

  • 1 YARA rules
  • 271 Sigma rules

Malware & tools used

  • Visual Basic (attack-pattern)
  • Spearphishing Attachment (attack-pattern)
  • Encrypted/Encoded File (attack-pattern)
  • System Information Discovery (attack-pattern)
  • DLL (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Compression (attack-pattern)
  • Deobfuscate/Decode Files or Information (attack-pattern)
  • Malicious File (attack-pattern)
  • Malicious Link (attack-pattern)
  • Spearphishing Link (attack-pattern)

Used by threat actors

Detection rules

  • MALPEDIA_Win_Kerrdown_Auto (yara-rule)

Reports & references

  • CrowdStrike — Report2020Crowdstrikeglobalthreatreport (report)
  • secureworks.com — Tin Woodlawn (report)
  • volexity.com — Oceanlotus Extending Cyber Espionage Operations Through Fake Websites (report)
  • CrowdStrike — Report2021Gtr (report)
  • amnestyusa.org — Click And Bait Vietnamese Human Rights Defenders Targeted With Spyware Attacks (report)
  • ti.qianxin.com — Cb78386A082F465F259B37Dae5Df4884 (report)
  • github.com — 2021 02 24 Vietnam (report)
  • norfolkinfosec.com — Jeshell An Oceanlotus Apt32 Backdoor (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Kerrdown (report)
  • Palo Alto Unit 42 — Tracking Oceanlotus New Downloader Kerrdown (report)
  • blog.cystack.net — Word Based Malware Attack (report)
  • go.recordedfuture.com — Cta 2020 1110 (report)
  • amnesty.de — Amnesty Bericht Vietnam Click And Bait Blogger Deutschland Spionage Menschenrechtsverteidiger Februar 2021 (report)
  • tradahacking.vn — Th%C6%B0%E1%Bb%9Fng T%E1%Ba%Bft Fbcbbed49Da7 (report)
  • MITRE ATT&CK — S0585 (report)

External references