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

Static analysis result for SHA-256 117fafb46f272383…

MALICIOUS

Office (OOXML) / .DOCM

70.4 KB Created: 2021-01-21 20:36:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: af95e1c1854cc48b0042b3781bddb762 SHA-1: d4ad3d830fd782dab6bc8edaa507b57c1b51bb59 SHA-256: 117fafb46f27238351f2111e8f01416412044238d2f8378a285063eb9d4eef3d
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a DOCM file containing VBA macros. The macros utilize CreateObject and CallByName functions, indicative of malicious intent. The script attempts to open a workbook from a source specified by UserForm2.ComboBox1, which is likely an obfuscated URL or path. The ClamAV detection 'Doc.Malware.Valyria-10033904-0' further confirms its malicious nature. The primary function of the VBA script appears to be downloading and executing a second-stage payload.

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
0ae0e3a10b23fef3a5ccfabb8ecfdd203ac34de787974095a1fb6222b48fee29		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9056 bytes
vbaProject_00.bin
f84d5fc96a46bfc2c8208817dc971fa21f4631e85446adc1113f501c0d37981f		 vba-project OOXML VBA project: word/vbaProject.bin 44032 bytes
Detection
ClamAV: Doc.Malware.Valyria-10033904-0
Obfuscation or payload: unlikely

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