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

Static analysis result for SHA-256 040a085c1bc2d9b4…

MALICIOUS

Office (OOXML) / .DOCM

66.3 KB Created: 2021-02-24 15:09:00 UTC Authoring application: 16.0000
MD5: 4f311c174b669f73532610229074f397 SHA-1: 402e1f29a206e3691c846d4e156c8663222605fb SHA-256: 040a085c1bc2d9b490af3ba683cf7e365d596d6d9089c81a0662379db80f129e
222 Risk Score

Malware Insights

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

The file is a DOCM document containing VBA macros, as indicated by multiple heuristics including 'OOXML_VBA' and 'OLE_VBA_CREATEOBJ'. The ClamAV detection 'Doc.Malware.Logan-10033906-0' strongly suggests malicious intent. The VBA code, while heavily obfuscated, uses calls like 'CreateObject' and 'CallByName', typical for executing downloaded payloads. The presence of embedded VBA macros points to a spearphishing attachment delivery method.

Heuristics 6

  • ClamAV: Doc.Malware.Logan-10033906-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Logan-10033906-0
  • 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.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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.microsoft.com/office/drawing/2015/9/8/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
eb99bee9e363dd5b0129230eb91afd5d7d3ab40b03f2f65c0720dd62b68e9522		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14915 bytes
vbaProject_00.bin
5fec56259de23d386aabc1940099db391d20eef76a1da86a54c87c7db008bd92		 vba-project OOXML VBA project: word/vbaProject.bin 82944 bytes
Detection
ClamAV: Doc.Malware.Logan-10033906-0
Obfuscation or payload: unlikely

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