Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5f1980fc9f92e47d…

MALICIOUS

Office (OOXML)

15.7 KB Created: 2021-07-16 10:28:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 89d61f3ca3dc117cc78d6ad509cf5112 SHA-1: dafdd8193c570e573633006dff910398e67f46a8 SHA-256: 5f1980fc9f92e47dfbb2d5d6436a6dbd2fa81de9b1050e5e21f49fa5ad2d31e3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro that executes upon opening the document. This macro reassembles a string to construct a command to launch PowerShell with hidden window style. The intent is to download and execute a second-stage payload, as indicated by the obfuscated command construction and the use of the 'Shell' API.

Heuristics 5

  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
0421f9dd966bf3ca2993f37af13b1679ae998dc497e2a39cf0debf335e5bd488		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 554 bytes
vbaProject_00.bin
1828a40f4484e3445f4c3de1d67ab6039dd65e3c96255928a23b5839e72db71b		 vba-project OOXML VBA project: word/vbaProject.bin 8704 bytes

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