Formbook — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 3562284d7be5e950…

MALICIOUS

Office (OOXML) / .DOC

250.2 KB Created: 2022-07-26 17:00:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2022-08-04
MD5: d6a5a2a216ccfb1f6a97defa212549ed SHA-1: a61968bdb26d452548cb07ca9bd09eda599e0945 SHA-256: 3562284d7be5e950a325d4cd3901a1f0dca1b2dbbcb96f49e8be81e65ec010b6
142 Risk Score

Malware Insights

Formbook · confidence 95%

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution of Malicious File T1566.001 Phishing: Spearphishing Attachment

The file exhibits critical heuristic firings for remote template injection and an embedded OLE object, strongly indicating a downloader. ClamAV detection confirms this, identifying it as a Formbook variant. The embedded URL https://srsp.app/XZroe is likely used to fetch and execute a second-stage payload, consistent with Formbook's typical behavior.

Heuristics 5

  • ClamAV: Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0
  • Remote template injection high OOXML_REMOTE_TEMPLATE
    Document references a remote template URL (https://srsp.app/XZroe) — a common remote-template-injection vector used by Hancitor, Emotet and many phishing campaigns. Word can fetch and apply the remote template; macros in that template may execute depending on Office policy and trust state.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in word/_rels/settings.xml.rels: https://srsp.app/XZroe
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://srsp.app/XZroe
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
e10d2153617ff1a3d0c665aff5c829ef6fa82c21d2162de36eea912608849350		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 1588224 bytes
ooxml_oleobject_00_ole10native_00.bin
f570e8217713261559a40f50c04ecd718dc85bea3053a26bd9d99fcb2a080d4f		 ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1572612 bytes

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