Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2e98105698963794…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:24:45 Authoring application: Microsoft Excel First seen: 2021-10-23
MD5: 610fb06532fd05a4eae0a77eeaec8534 SHA-1: caad50217bcf77f141f81d04437ec2f3eedb1dc0 SHA-256: 2e98105698963794982e1cce4dc81819162721ebed6987b9829f0cfd649c5b78
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the document. The macro sheet contains a reference to a dangerous formula API, suggesting it's designed to perform harmful actions. No specific family could be identified, and no external IOCs were extracted.

Heuristics 3

  • 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.

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) 6561 bytes
SHA-256: 346a5a2b6a068bb7aedec8efc518e2dca37fea5028092807fcd290540da48712
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  WeUcsDOZT
' 0018     21 LABEL : Cell Value, String Constant - alBYjW len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I145 
' 0018     20 LABEL : Cell Value, String Constant - diGUW len=0 
' 0018     24 LABEL : Cell Value, String Constant - lNvxGcMpy len=0 
' 0018     26 LABEL : Cell Value, String Constant - mkVaimNcvKW len=0 
' 0018     20 LABEL : Cell Value, String Constant - oOgyr len=0 
' 0018     26 LABEL : Cell Value, String Constant - oYSWrbFcxgZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - QKVajtDr len=0 
' 0018     26 LABEL : Cell Value, String Constant - RgrPZXQWhPG len=0 
' 0018     27 LABEL : Cell Value, String Constant - TjGNqvkGJxGs len=0 
' 0018     20 LABEL : Cell Value, String Constant - TslLE len=0 
' 0018     26 LABEL : Cell Value, String Constant - twTVjRWFtPd len=0 
' 0018     26 LABEL : Cell Value, String Constant - VCwgsigMCoW len=0 
' 0018     26 LABEL : Cell Value, String Constant - WtQWjNULqRa len=0 
' 0018     25 LABEL : Cell Value, String Constant - xGiIqEymIu len=0 
' 0018     20 LABEL : Cell Value, String Constant - XPiQr len=0 
' 0018     20 LABEL : Cell Value, String Constant - XSRal len=0 
' 0018     26 LABEL : Cell Value, String Constant - xsSsoItUzPV len=0 
' 0018     24 LABEL : Cell Value, String Constant - XunUFDOQE len=0 
' 0018     25 LABEL : Cell Value, String Constant - YZKfjsqFaS len=0 
' 0018     24 LABEL : Cell Value, String Constant - znlNOhNZP len=0 
' 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
' 
... (truncated)

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