Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 682a0271634d03ef…

MALICIOUS

Office (OOXML) / .DOC

23.0 KB Created: 2021-03-15 13:26:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2023-02-05
MD5: 565cfb68b56386b70fcc0e8ffa09a34a SHA-1: d6c14938f555b42291bfdba767abf2e4fb558553 SHA-256: 682a0271634d03ef2bedf79ddb18e462adcada30e7729ddc77646fa9d820e773
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an OOXML document containing a VBA macro triggered by the Document_Open event. The macro attempts to overwrite itself with code from the 'macros.bas' file and then execute it. This behavior is indicative of a downloader or droppper, aiming to fetch and run a secondary malicious payload. The presence of the 'APMPKILL' strings and the Document_Open macro strongly suggest malicious intent.

Heuristics 5

  • ClamAV: Doc.Macro.APMPKILL-6097118-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.APMPKILL-6097118-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ed8e1b2333282406faa2dfc8caae74cf5a799e7a9799d26c070206d32e7192dc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1047 bytes
vbaProject_00.bin
428719ac099cd34aeee5efa4f49b210cbe7a7305134bdb3ffaf08f1c12fcea76		 vba-project OOXML VBA project: word/vbaProject.bin 12288 bytes
Detection
ClamAV: Doc.Macro.APMPKILL-6097118-0
Obfuscation or payload: unlikely

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