ZxxZ

MITRE ATT&CK: S1013 View on attack.mitre.org

Aliases: MuuyDownloader, ZxxZ

First seen
2021-08-01 00:00:00
Malware type
trojan, downloader
Family
Malware family
Operating systems
windows
Profile updated
2026-07-07 13:20:57

Targeted industries: government-and-public-sector

Targeted regions: country_code:bd

Context

ZxxZ is a trojan written in Visual C++ that has been used by BITTER since at least August 2021, including against Bangladeshi government personnel.

Detection coverage

  • 1 YARA rules
  • 267 Sigma rules

Malware & tools used

  • Native API (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Process Discovery (attack-pattern)
  • System Information Discovery (attack-pattern)
  • Security Software Discovery (attack-pattern)
  • Masquerade Task or Service (attack-pattern)
  • Query Registry (attack-pattern)
  • Encrypted/Encoded File (attack-pattern)
  • Scheduled Task (attack-pattern)
  • Malicious File (attack-pattern)
  • Spearphishing Attachment (attack-pattern)
  • System Owner/User Discovery (attack-pattern)
  • Data from Local System (attack-pattern)
  • Deobfuscate/Decode Files or Information (attack-pattern)

Used by threat actors

Detection rules

  • MALPEDIA_Win_Zxxz_Auto (yara-rule)

Reports & references

  • Cisco Talos — Bitter Apt Adds Bangladesh To Their (report)
  • secuinfra.com — Whatever Floats Your Boat Bitter Apt Continues To Target Bangladesh (report)
  • threatray.com — The Bitter End Unraveling Eight Years Of Espionage Antics Part Two (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Zxxz (report)
  • MITRE ATT&CK — S1013 (report)

External references