Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c115316dcf390771…

MALICIOUS

Office (OLE)

628.5 KB Created: 2020-06-22 13:37:03 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 2734f443c9855f85a12694e998d37a70 SHA-1: aa72b11e2be035dec5083728f399cbdb028bf9bd SHA-256: c115316dcf39077132d694720888c6e48d43088f42c39e0ac31b0401be9b1365
102 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro-enabled workbook that uses an Auto_Open macro to execute. The document body contains a lure instructing the user to enable editing and content, which is a common tactic for macro-based malware. No external URLs or network indicators were found, suggesting the primary function is to execute the embedded XLM macro.

Heuristics 4

  • 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.
  • 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
  • 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/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/ResourceEvent#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/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) 197581 bytes
SHA-256: 9afd3b1313e9640bb9a38ee3d7b423305f20411cef980a2757a43d38fda9fc89
Preview script
First 1,000 lines of the extracted script
' 0085     25 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden -  fbQkbSfpYYMxZvIW
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     21 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  ihxCEvVkcNuw
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0018     23 LABEL : Cell Value, String Constant - afcnqGbc len=0 
' 0018     24 LABEL : Cell Value, String Constant - aGBCzFpjq len=0 
' 0018     63 LABEL : Cell Value, String Constant - ahjsQLoqXdwFtaVVUZKRYoPOeUXPnRvtbQkbSfpYYMMmvIkE len=0 
' 0018     23 LABEL : Cell Value, String Constant - aJJwiKgs len=0 
' 0018     23 LABEL : Cell Value, String Constant - aQvFFEIt len=0 
' 0018     22 LABEL : Cell Value, String Constant - arSrDwP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  fbQkbSfpYYMxZvIW!HB27989 
' 0018     21 LABEL : Cell Value, String Constant - BdwczS len=0 
' 0018     54 LABEL : Cell Value, String Constant - BeJsodxnesDllYLmJVjRiUYxmjdvsQlKQMYbpLN len=0 
' 0018     37 LABEL : Cell Value, String Constant - BEvUjcNuwRtyMWrFseGcbD len=0 
' 0018     48 LABEL : Cell Value, String Constant - BfsrILOGetmWFHbEJWTCPooQYlNgMkCcC len=0 
' 0018     20 LABEL : Cell Value, String Constant - bftpY len=0 
' 0018     55 LABEL : Cell Value, String Constant - BIaiYEyzxDohoSteuyCsSuaKGuPFvKUDDpcDZmBi len=0 
' 0018     45 LABEL : Cell Value, String Constant - BQXZiGBegNTmujPLLJOzGNeFEUKNFd len=0 
' 0018     46 LABEL : Cell Value, String Constant - brHcQZwrVXEXdlaGPQOTqwFivuLPRJi len=0 
' 0018     56 LABEL : Cell Value, String Constant - BrhvGoobcDMYBUyXpCpmgyvTDNTPbrsOQZweIXEKd len=0 
' 0018     52 LABEL : Cell Value, String Constant - bSfqZYMMnvIkEjIZlZXRjgDmxDzLcdyzJhOrH len=0 
' 0018     53 LABEL : Cell Value, String Constant - BTCZJTZVhxNUWfDxbdKQjrgNIIHMwELbCBRHKC len=0 
' 0018     49 LABEL : Cell Value, String Constant - btdzjuBwIZnvwHeZCEkqKSInijhmXelCdc len=0 
' 0018     47 LABEL : Cell Value, String Constant - cBHDORgCDNWRuKdwQLzfopnsdXeIVUko len=0 
' 0018     34 LABEL : Cell Value, String Constant - cbrhkcBeJHodxnesDll len=0 
' 0018     35 LABEL : Cell Value, String Constant - ccPCcyMaIZLPodaUmjGc len=0 
' 0018     29 LABEL : Cell Value, String Constant - CFIzYCgQMBVMDQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - cJmDipJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - cmgKasNg len=0 
' 0018     22 LABEL : Cell Value, String Constant - CmtBRrr len=0 
' 0018     23 LABEL : Cell Value, String Constant - CMuuhhJS len=0 
' 0018     22 LABEL : Cell Value, String Constant - COpKoNf len=0 
' 0018     43 LABEL : Cell Value, String Constant - CPaJIvvXfrUnTqJVJHBTQmWhmjuM len=0 
' 0018     56 LABEL : Cell Value, String Constant - cqmVjIJjsFhBfEWvWhbtczjtzvIYnuwGdYCEkqKSH len=0 
' 0018     30 LABEL : Cell Value, String Constant - cryzKhcGInuNVLq len=0 
' 0018     50 LABEL : Cell Value, String Constant - CxKapLyIfaEGmGMUJoxywCZgnRedtxzrRgY len=0 
' 0018     23 LABEL : Cell Value, String Constant - CxKNbwyI len=0 
' 0018     33 LABEL : Cell Value, String Constant - DBdLcOSrSdXpmKfEvs len=0 
' 0018     22 LABEL : Cell Value, String Constant - DidechS len=0 
' 0018     34 LABEL : Cell Value, String Constant - dIiUkoqiIkPzujEulyK len=0 
' 0018     23 LABEL : Cell Value, String Constant - dJSTRWHz len=0 
' 0018     47 LABEL : Cell Value, String Constant - DknIkoDzivVVwFRtNsRiIitnGpMvHMJU len=0 
' 0018     23 LABEL : Cell Value, String Constant - dLNhKPcZ len=0 
' 0018     50 LABEL : Cell Value, String Constant - DORgCDMWRuKdwQLzfopnsdWeIVUkoqiIXPz len=0 
' 0018     23 LABEL : Cell Value, String Constant - dRPJbYue len=0 
' 0018     25 LABEL : Cell Value, String Constant - dUKYiRREFf len=0 
' 0018     52 LABEL : Cell Value, String Constant - dULYiRRFqSoBPwOzEeSPJbZvRpvrEHVqsCMHk len=0 
' 0018     23 LABEL : Cell
... (truncated)

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