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

Static analysis result for SHA-256 0ffa5b0513ed2de0…

MALICIOUS

Office (OOXML) / .DOCM

71.3 KB Created: 2021-01-21 21:06:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1994a920fbf06b53204511b1f2b405e3 SHA-1: ee27f1e14b140e6a4373250caa0cc575fcc84c5f SHA-256: 0ffa5b0513ed2de0e155f029b6872fc40dd06046ba65fdf9adddaba867faf4f9
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a DOCM file containing VBA macros, as indicated by multiple heuristic firings including 'OOXML_VBA' and 'OLE_VBA_CREATEOBJ'. The VBA code attempts to use 'CreateObject' and 'CallByName' to execute code, likely to download and run a secondary payload. The ClamAV detection 'Doc.Malware.Valyria-10033904-0' further confirms its malicious nature. The specific VBA objects and methods used suggest an attempt to bypass security controls and execute arbitrary code.

Heuristics 6

  • ClamAV: Doc.Malware.Valyria-10033904-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10033904-0
  • 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.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
600124a7f31ddad829b48f06f4d1e6ea171fec2ad1e6c0168f81a2f5b8e8fc78		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 10052 bytes
vbaProject_00.bin
008a33eff6939e4f99ad725ea773f096f94fdce327d37cbf75b90288411e3b42		 vba-project OOXML VBA project: word/vbaProject.bin 45056 bytes
Detection
ClamAV: Doc.Malware.Valyria-10033904-0
Obfuscation or payload: unlikely

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