Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9646d648821358fd…

MALICIOUS

Office (OLE)

295.0 KB Created: 2020-07-10 10:41:45 Authoring application: Microsoft Excel First seen: 2020-09-15
MD5: f9c289e0aba7eb3679e80827bce86139 SHA-1: 3158dcee3e93688632566bfcd8c79767831a322e SHA-256: 9646d648821358fd1624903482b3a5c8b8840e6ae08c4483799e196eae2ddf27
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel 4.0 macro-enabled document that uses an Auto_Open macro. It contains heuristics indicating a lure to enable macros and impersonates a document signing service. The XLM macro sheet contains a call to a dangerous API (RUN=0), suggesting it is designed to download and execute a second-stage payload. No specific family could be identified.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 46690 bytes
SHA-256: 02beb430d9b6fdf3af998b31e44987c2df141b12fb08d17c427956a129de5632
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, very hidden -  Sheet
' 0085      9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     44 LABEL : Cell Value, String Constant - agzIxdYZXcNGOrTEUYaSrUyjfTneV len=0 
' 0018     56 LABEL : Cell Value, String Constant - aspNwHNJVlmIKTqYBRxEXfUzvvuzkdkPpbruxpOrW len=0 
' 0018     53 LABEL : Cell Value, String Constant - asSsExQyWGQWSeuKRTczuYaHNgoeKFFEJtBIYy len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!BE10512 
' 0018     20 LABEL : Cell Value, String Constant - aWhyz len=0 
' 0018     16 LABEL : Cell Value, String Constant - B len=0 
' 0018     58 LABEL : Cell Value, String Constant - betPQZjeIXqKdYNsCDBGqjrVihxCEvVkcNuwRtyNXrG len=0 
' 0018     31 LABEL : Cell Value, String Constant - BGTQyMllNViKdJhy len=0 
' 0018     25 LABEL : Cell Value, String Constant - BTQnJhZWhy len=0 
' 0018     60 LABEL : Cell Value, String Constant - BuNKgDbTPbrHcQZwrVXEXdlaGPQOTqwFivuLPRJixpaIK len=0 
' 0018     62 LABEL : Cell Value, String Constant - CBcKbNRrSdXpmJeDvrDUjFrCZUxzfzGODirsqvTZgLYXnrt len=0 
' 0018     60 LABEL : Cell Value, String Constant - cBQJsadxaesoYlLLmuHjDiGYxYjdvfClwCyKbpxyIgaEG len=0 
' 0018     20 LABEL : Cell Value, String Constant - cCcnh len=0 
' 0018     18 LABEL : Cell Value, String Constant - CEY len=0 
' 0018     59 LABEL : Cell Value, String Constant - CkxXYyIUwQuTlLlwqJrPyJPLXnDKMVsnRTzGZhWDxxwC len=0 
' 0018     36 LABEL : Cell Value, String Constant - cNIwRIyMWGFseGcoDkCnr len=0 
' 0018     64 LABEL : Cell Value, String Constant - CRIKCbEigODXOFSdMLyyaiuXqWtMYMKEWTpZkpmxPQlmvUBet len=0 
' 0018     58 LABEL : Cell Value, String Constant - CZHkzgmGOEjefdiTMTxYKadgYxaFpkZtkboyihVHiFR len=0 
' 0018     49 LABEL : Cell Value, String Constant - DBGdkrVihxCFvVkcNuwSuyNJrGffGPbEXD len=0 
' 0018     48 LABEL : Cell Value, String Constant - dIgxYyKEWFcMWcYkBQXZiGBegNTmujPLL len=0 
' 0018     36 LABEL : Cell Value, String Constant - dJEFDIszHXyxOEGxXzecL len=0 
' 0018     45 LABEL : Cell Value, String Constant - dkPpbquxpOrWGCqLBrGQyylYzWiwev len=0 
' 0018     35 LABEL : Cell Value, String Constant - dlbHCDBGqjqVvhxBEvVx len=0 
' 0018     62 LABEL : Cell Value, String Constant - dlmkpNUbGSRhlofFUNwehCeiwscpPPpyLnHmKcCcnhzjGpz len=0 
' 0018     39 LABEL : Cell Value, String Constant - dlyatZxPpPbVmWscntpBShop len=0 
' 0018     46 LABEL : Cell Value, String Constant - DmxDzLcdyzJhOrHntNVLqlmkpaTaFfR len=0 
' 0018     17 LABEL : Cell Value, String Constant - DO len=0 
' 0018     36 LABEL : Cell Value, String Constant - dwczSeSPKbZvfpvrEVVrs len=0 
' 0018     46 LABEL : Cell Value, String Constant - dXNsBCzFqjqVhhwBEuUjcMtwRtxMWrF len=0 
' 0018     51 LABEL : Cell Value, String Constant - eETMvdgBdhvGbobOoLKmUlXbBbmgyvSoNFBN len=0 
' 0018     64 LABEL : Cell Value, String Constant - EFPmhLNszSaQvqrpugmtLlkBqtkKmSQxmHwnCMuuhhJReGaFd len=0 
' 0018     49 LABEL : Cell Value, String Constant - eHMaWFSrsTcoQkPnGfGRLdMjTdjfrIXegp len=0 
' 0018     26 LABEL : Cell Value, String Constant - eqkClIrDJFQ len=0 
' 0018     60 LABEL : Cell Value, String Constant - ESnpyJEhwPjDwmSbbafQJQuIHXadVtJClUWqTYlvReSEf len=0 
' 0018     51 LABEL : Cell Value, String Constant - esOCLidHJpKPXNsCCzFcjqVhhwBEvUjcMtwR len=0 
' 0018     60 LABEL : Cell Value, String Constant - eVitcbPPqyLnHmLcocaUmjGpBHDOfgCDMkRuKqwQYOtop len=0 
' 0018     58 LABEL : Cell Value, String Constant - EvsEVjFsCaVxzgBGOEjssrwTahMZYorumLaTDlnIkpD len=0 
' 0018     48 LABEL : Cell Value, String Constant - eWuKDmUXrUYmwSfSFgDBdLcOSrSdXpmKf len=0 
' 0018     32 LABEL : Cell Value, String Constant - FaclJqUjQWpxnTOPN len=0 
' 0018     23 LABEL : Cell Value, String Constant - FDkZtkao len=0 
' 0018     27 LABEL : Cell Value, String Constant - fGRLdawSrjfq len=0 
' 0018     23 LABEL : Cell Value, String Constant - FILDbqjT len=0 
' 0018     44 LABEL : Cell Value, String Constant - FIzYngQxBVxCQavJviKgeHoGrvVvH len=0 
' 0018     33 
... (truncated)

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