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

Static analysis result for SHA-256 e7ea83b5a151cdd2…

MALICIOUS

Office (OOXML) / .DOCM

25.9 KB Created: 2020-09-22 21:19:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: e37ef135cd8ccf0a403e02890ed4ca10 SHA-1: b69c01f430e6cd852319753ab5f4f8caee0874d3 SHA-256: e7ea83b5a151cdd23e01a26e14591d19eed2c053d405bd162f81de9f7957dafd
220 Risk Score

Malware Insights

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

The sample is a DOCM file containing VBA macros, indicated by the OOXML_VBA and OLE_VBA_AUTO heuristics. The presence of AutoOpen, Document_Open, and Auto_Open macros, along with a CreateObject call and suspicious VBA string obfuscation, strongly suggests that the macros are designed to execute automatically upon opening the document. The heuristic EXTRACTED_FILE_STATIC_TRIAGE further supports this, noting VBA Chr string obfuscation and auto-execution terms. The likely intent is to download and execute a second-stage payload.

Heuristics 7

  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open 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
f17d77d0385797e2f1ecdab2d5ec3a333ddb35c92c3e97bdd6ff4d35fad4f2d3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 11057 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 14 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
7f8f89a40ae614d725be1e5a2ecdf54560e9243ac08b1ecfe0cfcafb615a4d0c		 vba-project OOXML VBA project: word/vbaProject.bin 30720 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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