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Formbook (XLoader) Manufacturing Lures: Detection & IOCs

ZIP-attached droppers lead to a GHOST.dll injector that hollows aspnet_compiler.exe for Formbook. Get 24 IOCs, 9 detection rules and a free Splunk SPL rule.

Read the full threat intel for Formbook (XLoader) Manufacturing Lures: Detection & IOCs →

Chapters

  1. 0:00The hookFormbook hid in Windows tools.
  2. 0:04The storyAn emailed ZIP lure.
  3. 0:10Attack pathVictim opens script; obfuscated JavaScript drops PowerShell.
  4. 0:23AttributionNo threat actor is attributed.
  5. 0:27Indicators of compromise17 indicators to hunt: 3 IPs, 2 domains and 2 URLs, and more.
  6. 0:34MITRE ATT&CK techniques16 ATT&CK techniques, from initial access to command and control.
  7. 0:39Remediation5 steps now: Block www[.]hlushkova[.]top and www[.]stanbicfinanceug[.]com at DNS and web proxy.
  8. 0:50Detection rules9 detection rules, in SPL, KQL and Sigma.
Transcript

0:00Formbook hid in Windows tools.

0:05An emailed ZIP lure.

0:06It targets European manufacturing.

0:10Victim opens script; obfuscated JavaScript drops PowerShell.

0:15Hidden PowerShell runs next.

0:17Formbook runs inside a legit Windows tool.

0:20Browser credentials are stolen.

0:24No threat actor is attributed. Confidence: low.

0:2817 indicators to hunt: 3 IPs, 2 domains and 2 URLs, and more.

0:3416 ATT&CK techniques, from initial access to command and control.

0:395 steps now: Block www[.]hlushkova[.]top and www[.]stanbicfinanceug[.]com at DNS and web proxy.

0:519 detection rules, in SPL, KQL and Sigma.

0:56Threadlinqs. The unified security engineering platform.