Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 35f6c64f0ba2ed87…

MALICIOUS

Office (OOXML)

32.6 KB Created: 2017-05-12 06:54:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2017-07-07
MD5: 18ca2eab21d0817627f1ffefb91614c8 SHA-1: 20adaa3617d757040dff87ee5bc5b35d42dad25f SHA-256: 35f6c64f0ba2ed87bf09bd9c3d9c89f7a5b3b79127e5b093957da97930cee3eb
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is an OOXML document containing an embedded OLE object, which is flagged as a risky file type that drops an auto-executable payload, specifically a JSE file. ClamAV also detected it as a downloader. The document body instructs the user to double-click the embedded object to view payment details, suggesting a social engineering lure to execute the dropped payload.

Heuristics 4

  • ClamAV: Doc.Downloader.Generic-6332126-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6332126-2
  • Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
  • 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 http://schemas.openxmlformats.org/markup-compatibility/2006 In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2010/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/65839460.bin 59894 bytes
SHA-256: 13c8f653fbbd7fdfb62aa4ad7963755e32eac75a2a07093284deb9aca25736f5
Detection
ClamAV: Doc.Downloader.Generic-6332126-2
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/65839460.bin Ole10Native stream: Ole10Native 56038 bytes
SHA-256: f690245cb53ad5cf7d69c92592dda9674e1888e8b013fb7f61d324d60e06b679
emf_00.emf ooxml-emf OOXML EMF part: word/media/image3.emf 5188 bytes
SHA-256: bc2fcb48ca3c4959541d05c7304fbf5396b01b30f3df116306b7985d0df2782c
emf_01.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5180 bytes
SHA-256: 0a244e6d86ba1db10acf9e17243ff9fbafea7fb064d2b7de731d3398f7d7ed7a

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