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

Static analysis result for SHA-256 40fbac7a241bea41…

MALICIOUS

Office (OOXML) / .DOC

939.0 KB Created: 2020-04-13 18:42:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 34f83ff7b0a1d05aaf8f81c9803a3a02 SHA-1: b44f3d9221d90ddc6863e3323aa2ae7cfa1f4667 SHA-256: 40fbac7a241bea412734134394ca81c0090698cf0689f2b67c54aa66b7e04670
200 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing a VBA macro. The AutoOpen macro and CreateObject heuristic firings indicate that the macro is designed to execute automatically upon opening the document. ClamAV detection confirms the malicious nature of the file, identifying it as Win.Malware.Agent-9377359-0. The macro likely downloads and executes a second-stage payload.

Heuristics 6

  • ClamAV: Win.Malware.Agent-9377359-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Malware.Agent-9377359-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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
0257a90bdd58d8560d184ea310bf8fd67b15b926b8ad2e531561a3dc85e99a3e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4632 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
2bab59069574ca3c119816dfd81937f5f4194b2fccf28d39d12a44060a2261c0		 vba-project OOXML VBA project: word/vbaProject.bin 2363392 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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